Hi,
We decided to move back to the longterm kernel provided by Debian:
4.19.0-0.bpo.5-amd64 #1 SMP Debian 4.19.37-3~bpo9+1 (2019-05-18) x86_64,
Combined with the nohandlecache mount option we don't have any process stuck in 'D' yet (uptime of 1 week so far!)
However, this kernel dump showed up in the logs:
[260512.681619] list_del corruption. prev->next should be ffff9e766fa9c380, but was 8400f931ae8cf165
[260512.681995] ------------[ cut here ]------------
[260512.681996] kernel BUG at /build/linux-F9rbp9/linux-4.19.37/lib/list_debug.c:53!
[260512.682194] invalid opcode: 0000 [#1] SMP PTI
[260512.682382] CPU: 39 PID: 1303 Comm: cifsd Not tainted 4.19.0-0.bpo.5-amd64 #1 Debian 4.19.37-3~bpo9+1
[260512.682579] Hardware name: Cisco Systems Inc UCSC-C220-M4S/UCSC-C220-M4S, BIOS C220M4.3.0.4a.0.0226182253 02/26/2018
[260512.682828] RIP: 0010:__list_del_entry_valid+0x70/0x90
[260512.683049] Code: a3 08 a2 e8 60 ab d0 ff 0f 0b 48 89 fe 48 c7 c7 b0 a3 08 a2 e8 4f ab d0 ff 0f 0b 48 89 fe 48 c7 c7 e8 a3 08 a2 e8 3e ab d0 ff <0f> 0b 48 89 fe 48 c7 c7 28 a4 08 a2 e8 2d ab d0 ff 0f 0b 90 90 90
[260512.683795] RSP: 0018:ffffb1880df93dc0 EFLAGS: 00010282
[260512.684196] RAX: 0000000000000054 RBX: ffff9e8a78477800 RCX: 0000000000000000
[260512.684489] RDX: 0000000000000000 RSI: ffff9e8a7fe566b8 RDI: ffff9e8a7fe566b8
[260512.684791] RBP: ffff9e8a784779c0 R08: 0000000000000000 R09: 0000000000000911
[260512.685101] R10: ffffb1880df93c60 R11: ffff9e8a6be72610 R12: ffff9e766fa9c380
[260512.685422] R13: ffff9e8a78477998 R14: ffffb1880df93dd8 R15: 8400f931ae8cf165
[260512.685750] FS: 0000000000000000(0000) GS:ffff9e8a7fe40000(0000) knlGS:0000000000000000
[260512.686094] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[260512.686462] CR2: 00007f18114cef80 CR3: 0000003a93e0a005 CR4: 00000000003606e0
[260512.687011] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[260512.687504] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[260512.687875] Call Trace:
[260512.688282] cifs_reconnect+0x2fc/0x880 [cifs]
[260512.688686] cifs_handle_standard+0x169/0x190 [cifs]
[260512.689092] cifs_demultiplex_thread+0xa2a/0xbc0 [cifs]
[260512.689515] ? __switch_to_asm+0x40/0x70
[260512.689939] kthread+0xf8/0x130
[260512.690378] ? cifs_handle_standard+0x190/0x190 [cifs]
[260512.690814] ? kthread_create_worker_on_cpu+0x70/0x70
[260512.691257] ret_from_fork+0x35/0x40
[260512.691704] Modules linked in: cpufreq_powersave cpufreq_conservative cpufreq_userspace arc4 md4 sha512_ssse3 sha512_generic c mac nls_utf8 cifs nfsv3 nfs ccm dns_resolver fscache intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel k vm irqbypass acpi_power_meter crct10dif_pclmul mgag200 ipmi_ssif acpi_ipmi ttm crc32_pclmul drm_kms_helper ghash_clmulni_intel drm iTCO_wdt joydev iTCO_vendor_support intel_cstate evdev intel_uncore mei_me sg intel_rapl_perf mei lpc_ich mxm_wmi pcc_cpufreq ipm i_si ipmi_devintf wmi ipmi_msghandler acpi_pad ac button binfmt_misc nfsd nfs_acl lockd grace auth_rpcgss sunrpc ip_tables x_table s autofs4 hid_generic usbhid hid ext4 crc16 mbcache jbd2 crc32c_generic fscrypto ecb sd_mod ahci libahci crc32c_intel fnic libata libfcoe libfc megaraid_sas aesni_intel
[260512.695513] scsi_transport_fc aes_x86_64 crypto_simd ehci_pci cryptd ehci_hcd glue_helper scsi_mod igb usbcore enic i2c_algo_ bit usb_common dca
[260512.696809] ---[ end trace 469eb33f60a57cab ]---
[260512.722046] RIP: 0010:__list_del_entry_valid+0x70/0x90
[260512.722707] Code: a3 08 a2 e8 60 ab d0 ff 0f 0b 48 89 fe 48 c7 c7 b0 a3 08 a2 e8 4f ab d0 ff 0f 0b 48 89 fe 48 c7 c7 e8 a3 08 a2 e8 3e ab d0 ff <0f> 0b 48 89 fe 48 c7 c7 28 a4 08 a2 e8 2d ab d0 ff 0f 0b 90 90 90
[260512.724106] RSP: 0018:ffffb1880df93dc0 EFLAGS: 00010282
[260512.724831] RAX: 0000000000000054 RBX: ffff9e8a78477800 RCX: 0000000000000000
[260512.725625] RDX: 0000000000000000 RSI: ffff9e8a7fe566b8 RDI: ffff9e8a7fe566b8
[260512.726364] RBP: ffff9e8a784779c0 R08: 0000000000000000 R09: 0000000000000911
[260512.727112] R10: ffffb1880df93c60 R11: ffff9e8a6be72610 R12: ffff9e766fa9c380
[260512.727895] R13: ffff9e8a78477998 R14: ffffb1880df93dd8 R15: 8400f931ae8cf165
[260512.728666] FS: 0000000000000000(0000) GS:ffff9e8a7fe40000(0000) knlGS:0000000000000000
[260512.729432] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[260512.730187] CR2: 00007f18114cef80 CR3: 0000003a93e0a005 CR4: 00000000003606e0
[260512.730942] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[260512.731689] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
I looked into the patched that are applied to cifs on the 4.19 branch, but, in my assumption, I did
not find any related to this particular issue.
Regards, Martijn
On 16-07-2019 01:40, Pavel Shilovsky wrote:
> Thanks for letting us know.
>
> This looks like a memory problem - similar to the one reported in
> "General protection faults in cifs_reconnect..." thread. It doesn't
> seem like encryption is used here, so the problem is somewhere else.
>
> From the stack trace the kernel is 4.20.17, so it has many stable
> patches merged from the crediting series. Could you try older kernels?
> Like 4.20.2, 4.20.5 and 4.20.7 (all 3h have different set of fixes
> applied).
>
> --
> Best regards,
> Pavel Shilovsky
>
> вт, 9 июл. 2019 г. в 01:48, Martijn de Gouw
> <martijn.de.gouw@xxxxxxxxxxxxxxxxxxxxxxxxx>:
>>
>> Hi,
>>
>> Here is another kernel log, but it looks like a different issue.
>> All cifs mounts have the nohandlecache option set.
>> This server is running the kernel without the V2 patch:
>>
>> [706049.499153] kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
>> [706049.499183] BUG: unable to handle kernel paging request at ffff8e6381d549d0
>> [706049.499222] PGD 175c02067 P4D 175c02067 PUD 262470063 PMD 8000000101c000e3
>> [706049.499245] Oops: 0011 [#1] PREEMPT SMP PTI
>> [706049.499258] CPU: 0 PID: 77140 Comm: cifsd Tainted: G E 4.20.17-pd-4.20.y #20190611
>> [706049.499280] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 09/19/2018
>> [706049.499320] RIP: 0010:0xffff8e6381d549d0
>> [706049.499332] Code: ff ff 00 00 00 00 e2 04 00 00 00 7d 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <d0> 49 d5 81 63 8e ff ff d0 49 d5 81 63 8e ff ff 00 91 36 88 63 8e
>> [706049.499374] RSP: 0018:ffff9d2bd0c8bdc0 EFLAGS: 00010202
>> [706049.499388] RAX: ffff8e6381d549d0 RBX: ffff8e659b599000 RCX: dead000000000200
>> [706049.499405] RDX: ffff8e66a9fe4280 RSI: 0000000000000246 RDI: ffff8e6381d54998
>> [706049.499422] RBP: ffff8e66a9fe4280 R08: 0000000000000000 R09: ffff8e6381d54970
>> [706049.499439] R10: ffff9d2bd0c8bc10 R11: ffff8e66a346c000 R12: ffff8e659b5991c0
>> [706049.499456] R13: ffff8e66a9fe4280 R14: ffff9d2bd0c8bdd8 R15: ffff8e66a9fe4900
>> [706049.499473] FS: 0000000000000000(0000) GS:ffff8e66adc00000(0000) knlGS:0000000000000000
>> [706049.499495] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [706049.499516] CR2: ffff8e6381d549d0 CR3: 0000000427928002 CR4: 00000000003606f0
>> [706049.499589] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> [706049.499607] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> [706049.499625] Call Trace:
>> [706049.499934] CIFS VFS: No task to wake, unknown frame received! NumMids 3
>> [706049.500076] ? cifs_reconnect+0x337/0x880 [cifs]
>> [706049.500764] 00000000: 424d53fe 00010040 00000000 00000005 .SMB@...........
>> [706049.501157] ? cifs_handle_standard+0x169/0x190 [cifs]
>> [706049.501166] ? cifs_demultiplex_thread+0x9e5/0xbc0 [cifs]
>> [706049.501867] 00000010: 00000001 00000098 0000046b 00000000 ........k.......
>> [706049.502259] ? finish_task_switch+0x7d/0x290
>> [706049.502980] 00000020: 000002c3 00000001 00000905 00007400 .............t..
>> [706049.503352] ? cifs_handle_standard+0x190/0x190 [cifs]
>> [706049.504057] 00000030: 00000000 00000000 00000000 00000000 ................
>> [706049.504475] ? kthread+0xf8/0x130
>> [706049.504478] ? kthread_create_worker_on_cpu+0x70/0x70
>> [706049.505247] CIFS VFS: No task to wake, unknown frame received! NumMids 3
>> [706049.505681] ? ret_from_fork+0x35/0x40
>> [706049.506498] 00000000: 424d53fe 00010040 00000000 00000010 .SMB@...........
>> [706049.506926] Modules linked in: dm_snapshot(E) dm_bufio(E) cpufreq_userspace(E) cpufreq_conservative(E) cpufreq_powersave(E) arc4(E) ecb(E) nfsv3(E) md4(E) nfs_acl(E) sha512_ssse3(E) nfs(E) sha512_generic(E) cmac(E) hmac(E) lockd(E) nls_utf8(E) cifs(E) grace(E) ccm(E) dns_resolver(E) fscache(E) vmw_vsock_vmci_transport(E) vsock(E) sb_edac(E) crct10dif_pclmul(E) crc32_pclmul(E) ghash_clmulni_intel(E) vmwgfx(E) ttm(E) aesni_intel(E) drm_kms_helper(E) aes_x86_64(E) crypto_simd(E) sg(E) cryptd(E) joydev(E) evdev(E) vmw_balloon(E) drm(E) glue_helper(E) vmw_vmci(E) serio_raw(E) ac(E) button(E) auth_rpcgss(E) sunrpc(E) ip_tables(E) x_tables(E) autofs4(E) ext4(E) crc32c_generic(E) crc16(E) mbcache(E) jbd2(E) dm_mod(E) sr_mod(E) cdrom(E) ata_generic(E) sd_mod(E) ata_piix(E) libata(E) vmw_pvscsi(E) crc32c_intel(E) psmouse(E) e1000e(E) scsi_mod(E) i2c_piix4(E)
>> [706049.507729] 00000010: 00000005 00000068 0000046c 00000000 ....h...l.......
>> [706049.508166] CR2: ffff8e6381d549d0
>> [706049.508965] 00000020: 000002c3 00000001 00000905 00007400 .............t..
>> [706049.513140] ---[ end trace e371dfb71e7921db ]---
>> [706049.513143] RIP: 0010:0xffff8e6381d549d0
>> [706049.513144] Code: ff ff 00 00 00 00 e2 04 00 00 00 7d 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <d0> 49 d5 81 63 8e ff ff d0 49 d5 81 63 8e ff ff 00 91 36 88 63 8e
>> [706049.513145] RSP: 0018:ffff9d2bd0c8bdc0 EFLAGS: 00010202
>> [706049.513147] RAX: ffff8e6381d549d0 RBX: ffff8e659b599000 RCX: dead000000000200
>> [706049.513147] RDX: ffff8e66a9fe4280 RSI: 0000000000000246 RDI: ffff8e6381d54998
>> [706049.513148] RBP: ffff8e66a9fe4280 R08: 0000000000000000 R09: ffff8e6381d54970
>> [706049.513148] R10: ffff9d2bd0c8bc10 R11: ffff8e66a346c000 R12: ffff8e659b5991c0
>> [706049.513149] R13: ffff8e66a9fe4280 R14: ffff9d2bd0c8bdd8 R15: ffff8e66a9fe4900
>> [706049.513150] FS: 0000000000000000(0000) GS:ffff8e66adc00000(0000) knlGS:0000000000000000
>> [706049.513151] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [706049.513151] CR2: ffff8e6381d549d0 CR3: 0000000427928002 CR4: 00000000003606f0
>> [706049.513201] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> [706049.521671] 00000030: 00000000 00000000 00000000 00000000 ................
>> [706049.522058] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> [706049.523846] CIFS VFS: No task to wake, unknown frame received! NumMids 3
>> [706049.524699] 00000000: 424d53fe 00010040 00000000 00060006 .SMB@...........
>> [706049.525574] 00000010: 00000005 00000000 0000046d 00000000 ........m.......
>> [706049.526449] 00000020: 000002c3 00000001 00000905 00007400 .............t..
>> [706049.527304] 00000030: 00000000 00000000 00000000 00000000 ................
>> [707493.825696] CIFS VFS: Server stor02.bk.prodrive.nl has not responded in 120 seconds. Reconnecting...
>> [707615.670866] CIFS VFS: Server stor02.bk.prodrive.nl has not responded in 120 seconds. Reconnecting...
>> [707737.516154] CIFS VFS: Server stor02.bk.prodrive.nl has not responded in 120 seconds. Reconnecting...
>>
>> Regards, Martijn
>>
>> On 06-07-2019 18:40, Pavel Shilovsky wrote:
>>> Martijn, thanks for the traces. This is a deadlock as mentioned by Aurelien:
>>>
>>> [36247.368103] INFO: task puppet:3836 blocked for more than 120 seconds.
>>> [36247.368119] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>> [36247.368135] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
>>> disables this message.
>>> [36247.368158] puppet D 0 3836 541 0x00000000
>>> [36247.368159] Call Trace:
>>> [36247.368161] ? __schedule+0x338/0x850
>>> [36247.368163] schedule+0x3c/0x90
>>> [36247.368164] schedule_preempt_disabled+0x14/0x20
>>> [36247.368165] __mutex_lock.isra.7+0x19f/0x540
>>> [36247.368166] ? __switch_to_asm+0x34/0x70
>>> [36247.368167] ? __switch_to_asm+0x40/0x70
>>> [36247.368169] ? try_module_get+0x68/0x100
>>> [36247.368178] ? smb2_reconnect+0x1d7/0x4b0 [cifs]
>>> [36247.368186] smb2_reconnect+0x1d7/0x4b0 [cifs]
>>> [36247.368188] ? _raw_spin_unlock_irq+0x1d/0x30
>>> [36247.368189] ? finish_task_switch+0x7d/0x290
>>> [36247.368190] ? __switch_to_asm+0x40/0x70
>>> [36247.368198] smb2_plain_req_init+0x30/0x240 [cifs]
>>> [36247.368199] ? _raw_spin_lock_irqsave+0x25/0x50
>>> [36247.368208] SMB2_open_init+0x6d/0x7c0 [cifs]
>>> [36247.368209] ? _raw_spin_lock+0x13/0x30
>>> [36247.368218] ? cifs_mid_q_entry_release+0x15/0x40 [cifs]
>>> [36247.368227] ? SMB2_open+0x150/0x520 [cifs]
>>> [36247.368235] SMB2_open+0x150/0x520 [cifs]
>>> [36247.368238] ? sched_clock+0x5/0x10
>>> [36247.368247] ? open_shroot+0x12f/0x200 [cifs]
>>> [36247.368255] open_shroot+0x12f/0x200 [cifs]
>>> [36247.368258] ? __follow_mount_rcu.isra.31+0x3c/0xf0
>>> [36247.368267] smb2_query_path_info+0x93/0x220 [cifs]
>>> [36247.368269] ? walk_component+0x48/0x360
>>> [36247.368278] cifs_get_inode_info+0x580/0xb10 [cifs]
>>> [36247.368286] ? filename_lookup+0xf8/0x1a0
>>> [36247.368294] ? build_path_from_dentry_optional_prefix+0x1e9/0x440 [cifs]
>>> [36247.368303] cifs_revalidate_dentry_attr+0xdc/0x3e0 [cifs]
>>> [36247.368311] cifs_getattr+0x5b/0x1b0 [cifs]
>>> [36247.368313] vfs_statx+0x89/0xe0
>>> [36247.368315] __do_sys_newlstat+0x39/0x70
>>> [36247.368318] do_syscall_64+0x55/0x100
>>> [36247.368320] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>> [36247.368321] RIP: 0033:0x7f562d3a0335
>>> [36247.368323] Code: Bad RIP value.
>>>
>>> This looks urgent to fix - we have a parallel thread with the similar
>>> problem observed on 5.1 kernel. In order to fix it we need to drop
>>> open shroot mutex before going into SMB2_open_init and other PDU
>>> functions.
>>>
>>> You can try to work around this by specifying "nohandlecache" mount option.
>>>
>>> --
>>> Best regards,
>>> Pavel Shilovsky
>>>
>>> сб, 6 июл. 2019 г. в 06:05, Steve French <smfrench@xxxxxxxxx>:
>>>>
>>>> Are we sure this isn't something really simple like the server IP
>>>> address changing? Remember in 5.0 kernel (also updated cifs-utils)
>>>> the code to allow failover when server's IP address changes was added.
>>>>
>>>> On Sat, Jul 6, 2019 at 6:12 AM Martijn de Gouw
>>>> <martijn.de.gouw@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>>>>
>>>>> Hi Pavel,
>>>>>
>>>>> On 04-07-2019 23:34, Pavel Shilovsky wrote:
>>>>>> Hi Martijn,
>>>>>>
>>>>>> Thanks for reporting the problem. Have you tried v5.1.5 kernel and
>>>>>> above? That one has many reconnect fixes. If yes, could you please
>>>>>> provide the kernel stack / panic traces when running new versions of
>>>>>> the kernel?
>>>>>
>>>>> I can try to run them for a while on a less critical server. But even if that machine runs fine, there is not really a guarantee the cifs issue we have right now is solved for our critical machines, causing me to be very hesitated to upgrade those.
>>>>>
>>>>> Btw, here is another kernel dump, generated today. Please note that on this machine the cifs mounts are not really used, all 'action'
>>>>> performed on these mounts is the check if they are still mounted (by puppet).
>>>>>
>>>>>
>>>>> [36247.367572] INFO: task node_exporter:3567 blocked for more than 120 seconds.
>>>>> [36247.367613] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36247.367630] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36247.367648] node_exporter D 0 3567 1 0x00000000
>>>>> [36247.367650] Call Trace:
>>>>> [36247.367668] ? __schedule+0x338/0x850
>>>>> [36247.367671] ? preempt_count_add+0x67/0xb0
>>>>> [36247.367673] schedule+0x3c/0x90
>>>>> [36247.367675] schedule_preempt_disabled+0x14/0x20
>>>>> [36247.367676] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36247.367680] ? try_module_get+0x68/0x100
>>>>> [36247.367792] ? smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36247.367803] smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36247.367824] smb2_plain_req_init+0x30/0x240 [cifs]
>>>>> [36247.367826] ? __switch_to_asm+0x34/0x70
>>>>> [36247.367827] ? __switch_to_asm+0x40/0x70
>>>>> [36247.367836] SMB2_open_init+0x6d/0x7c0 [cifs]
>>>>> [36247.367846] ? smb2_queryfs+0x13d/0x350 [cifs]
>>>>> [36247.367848] ? lookup_fast+0xc8/0x2e0
>>>>> [36247.367857] smb2_queryfs+0x13d/0x350 [cifs]
>>>>> [36247.367861] ? lookup_fast+0xc8/0x2e0
>>>>> [36247.367863] ? ___cache_free+0x31/0x2e0
>>>>> [36247.367865] ? terminate_walk+0x93/0x100
>>>>> [36247.367873] ? cifs_statfs+0xad/0x300 [cifs]
>>>>> [36247.367880] cifs_statfs+0xad/0x300 [cifs]
>>>>> [36247.367894] statfs_by_dentry+0x6a/0x90
>>>>> [36247.367895] vfs_statfs+0x16/0xc0
>>>>> [36247.367897] user_statfs+0x50/0xa0
>>>>> [36247.367898] __do_sys_statfs+0x20/0x50
>>>>> [36247.367902] do_syscall_64+0x55/0x100
>>>>> [36247.367903] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>>>> [36247.367905] RIP: 0033:0x4a5c20
>>>>> [36247.367936] Code: Bad RIP value.
>>>>> [36247.367937] RSP: 002b:000000c0003ef490 EFLAGS: 00000206 ORIG_RAX: 0000000000000089
>>>>> [36247.367938] RAX: ffffffffffffffda RBX: 000000c00002a000 RCX: 00000000004a5c20
>>>>> [36247.367939] RDX: 0000000000000000 RSI: 000000c0003ef5c0 RDI: 000000c0004510e0
>>>>> [36247.367940] RBP: 000000c0003ef4f0 R08: 0000000000000000 R09: 0000000000000000
>>>>> [36247.367940] R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffff
>>>>> [36247.367941] R13: 0000000000000088 R14: 0000000000000087 R15: 0000000000000100
>>>>> [36247.367954] INFO: task kworker/1:2:32265 blocked for more than 120 seconds.
>>>>> [36247.367973] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36247.367989] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36247.368008] kworker/1:2 D 0 32265 2 0x80000000
>>>>> [36247.368020] Workqueue: cifsiod smb2_reconnect_server [cifs]
>>>>> [36247.368021] Call Trace:
>>>>> [36247.368023] ? __schedule+0x338/0x850
>>>>> [36247.368025] schedule+0x3c/0x90
>>>>> [36247.368026] schedule_preempt_disabled+0x14/0x20
>>>>> [36247.368028] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36247.368037] ? SMB2_sess_auth_rawntlmssp_authenticate+0x69/0x170 [cifs]
>>>>> [36247.368046] ? SMB2_sess_setup+0x17f/0x2c0 [cifs]
>>>>> [36247.368054] ? cifs_mark_open_files_invalid+0x54/0xa0 [cifs]
>>>>> [36247.368055] ? _raw_spin_unlock+0x16/0x30
>>>>> [36247.368062] cifs_mark_open_files_invalid+0x54/0xa0 [cifs]
>>>>> [36247.368071] smb2_reconnect+0x2d6/0x4b0 [cifs]
>>>>> [36247.368073] ? _raw_spin_unlock+0x16/0x30
>>>>> [36247.368074] ? preempt_count_add+0x67/0xb0
>>>>> [36247.368083] smb2_reconnect_server+0x1bb/0x350 [cifs]
>>>>> [36247.368090] process_one_work+0x188/0x3a0
>>>>> [36247.368092] worker_thread+0x4c/0x3a0
>>>>> [36247.368094] ? preempt_count_add+0x67/0xb0
>>>>> [36247.368095] ? process_one_work+0x3a0/0x3a0
>>>>> [36247.368097] kthread+0xf8/0x130
>>>>> [36247.368099] ? kthread_create_worker_on_cpu+0x70/0x70
>>>>> [36247.368101] ret_from_fork+0x35/0x40
>>>>> [36247.368103] INFO: task puppet:3836 blocked for more than 120 seconds.
>>>>> [36247.368119] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36247.368135] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36247.368158] puppet D 0 3836 541 0x00000000
>>>>> [36247.368159] Call Trace:
>>>>> [36247.368161] ? __schedule+0x338/0x850
>>>>> [36247.368163] schedule+0x3c/0x90
>>>>> [36247.368164] schedule_preempt_disabled+0x14/0x20
>>>>> [36247.368165] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36247.368166] ? __switch_to_asm+0x34/0x70
>>>>> [36247.368167] ? __switch_to_asm+0x40/0x70
>>>>> [36247.368169] ? try_module_get+0x68/0x100
>>>>> [36247.368178] ? smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36247.368186] smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36247.368188] ? _raw_spin_unlock_irq+0x1d/0x30
>>>>> [36247.368189] ? finish_task_switch+0x7d/0x290
>>>>> [36247.368190] ? __switch_to_asm+0x40/0x70
>>>>> [36247.368198] smb2_plain_req_init+0x30/0x240 [cifs]
>>>>> [36247.368199] ? _raw_spin_lock_irqsave+0x25/0x50
>>>>> [36247.368208] SMB2_open_init+0x6d/0x7c0 [cifs]
>>>>> [36247.368209] ? _raw_spin_lock+0x13/0x30
>>>>> [36247.368218] ? cifs_mid_q_entry_release+0x15/0x40 [cifs]
>>>>> [36247.368227] ? SMB2_open+0x150/0x520 [cifs]
>>>>> [36247.368235] SMB2_open+0x150/0x520 [cifs]
>>>>> [36247.368238] ? sched_clock+0x5/0x10
>>>>> [36247.368247] ? open_shroot+0x12f/0x200 [cifs]
>>>>> [36247.368255] open_shroot+0x12f/0x200 [cifs]
>>>>> [36247.368258] ? __follow_mount_rcu.isra.31+0x3c/0xf0
>>>>> [36247.368267] smb2_query_path_info+0x93/0x220 [cifs]
>>>>> [36247.368269] ? walk_component+0x48/0x360
>>>>> [36247.368278] cifs_get_inode_info+0x580/0xb10 [cifs]
>>>>> [36247.368286] ? filename_lookup+0xf8/0x1a0
>>>>> [36247.368294] ? build_path_from_dentry_optional_prefix+0x1e9/0x440 [cifs]
>>>>> [36247.368303] cifs_revalidate_dentry_attr+0xdc/0x3e0 [cifs]
>>>>> [36247.368311] cifs_getattr+0x5b/0x1b0 [cifs]
>>>>> [36247.368313] vfs_statx+0x89/0xe0
>>>>> [36247.368315] __do_sys_newlstat+0x39/0x70
>>>>> [36247.368318] do_syscall_64+0x55/0x100
>>>>> [36247.368320] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>>>> [36247.368321] RIP: 0033:0x7f562d3a0335
>>>>> [36247.368323] Code: Bad RIP value.
>>>>> [36247.368324] RSP: 002b:00007ffc6bbc4398 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
>>>>> [36247.368325] RAX: ffffffffffffffda RBX: 00007ffc6bbc43b0 RCX: 00007f562d3a0335
>>>>> [36247.368326] RDX: 00007ffc6bbc43b0 RSI: 00007ffc6bbc43b0 RDI: 000055e4e5e1bd50
>>>>> [36247.368326] RBP: 000055e4e2eb65e0 R08: 0000000000000002 R09: 000055e4e2eb69e0
>>>>> [36247.368327] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
>>>>> [36247.368328] R13: 000055e4e2ef7258 R14: 000055e4e2ef8810 R15: 000055e4e2f92ad0
>>>>> [36368.186922] INFO: task node_exporter:3567 blocked for more than 120 seconds.
>>>>> [36368.186988] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36368.187039] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36368.187097] node_exporter D 0 3567 1 0x00000000
>>>>> [36368.187102] Call Trace:
>>>>> [36368.187117] ? __schedule+0x338/0x850
>>>>> [36368.187123] ? preempt_count_add+0x67/0xb0
>>>>> [36368.187128] schedule+0x3c/0x90
>>>>> [36368.187133] schedule_preempt_disabled+0x14/0x20
>>>>> [36368.187138] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36368.187175] ? try_module_get+0x68/0x100
>>>>> [36368.187232] ? smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36368.187265] smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36368.187300] smb2_plain_req_init+0x30/0x240 [cifs]
>>>>> [36368.187304] ? __switch_to_asm+0x34/0x70
>>>>> [36368.187307] ? __switch_to_asm+0x40/0x70
>>>>> [36368.187337] SMB2_open_init+0x6d/0x7c0 [cifs]
>>>>> [36368.187372] ? smb2_queryfs+0x13d/0x350 [cifs]
>>>>> [36368.187375] ? lookup_fast+0xc8/0x2e0
>>>>> [36368.187405] smb2_queryfs+0x13d/0x350 [cifs]
>>>>> [36368.187410] ? lookup_fast+0xc8/0x2e0
>>>>> [36368.187416] ? ___cache_free+0x31/0x2e0
>>>>> [36368.187421] ? terminate_walk+0x93/0x100
>>>>> [36368.187449] ? cifs_statfs+0xad/0x300 [cifs]
>>>>> [36368.187471] cifs_statfs+0xad/0x300 [cifs]
>>>>> [36368.187477] statfs_by_dentry+0x6a/0x90
>>>>> [36368.187482] vfs_statfs+0x16/0xc0
>>>>> [36368.187486] user_statfs+0x50/0xa0
>>>>> [36368.187491] __do_sys_statfs+0x20/0x50
>>>>> [36368.187499] do_syscall_64+0x55/0x100
>>>>> [36368.187503] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>>>> [36368.187507] RIP: 0033:0x4a5c20
>>>>> [36368.187517] Code: Bad RIP value.
>>>>> [36368.187519] RSP: 002b:000000c0003ef490 EFLAGS: 00000206 ORIG_RAX: 0000000000000089
>>>>> [36368.187523] RAX: ffffffffffffffda RBX: 000000c00002a000 RCX: 00000000004a5c20
>>>>> [36368.187526] RDX: 0000000000000000 RSI: 000000c0003ef5c0 RDI: 000000c0004510e0
>>>>> [36368.187528] RBP: 000000c0003ef4f0 R08: 0000000000000000 R09: 0000000000000000
>>>>> [36368.187530] R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffff
>>>>> [36368.187532] R13: 0000000000000088 R14: 0000000000000087 R15: 0000000000000100
>>>>> [36368.187572] INFO: task kworker/1:2:32265 blocked for more than 120 seconds.
>>>>> [36368.187627] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36368.187677] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36368.187735] kworker/1:2 D 0 32265 2 0x80000000
>>>>> [36368.187771] Workqueue: cifsiod smb2_reconnect_server [cifs]
>>>>> [36368.187773] Call Trace:
>>>>> [36368.187780] ? __schedule+0x338/0x850
>>>>> [36368.187785] schedule+0x3c/0x90
>>>>> [36368.187790] schedule_preempt_disabled+0x14/0x20
>>>>> [36368.187795] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36368.187826] ? SMB2_sess_auth_rawntlmssp_authenticate+0x69/0x170 [cifs]
>>>>> [36368.187855] ? SMB2_sess_setup+0x17f/0x2c0 [cifs]
>>>>> [36368.187880] ? cifs_mark_open_files_invalid+0x54/0xa0 [cifs]
>>>>> [36368.187885] ? _raw_spin_unlock+0x16/0x30
>>>>> [36368.187908] cifs_mark_open_files_invalid+0x54/0xa0 [cifs]
>>>>> [36368.187936] smb2_reconnect+0x2d6/0x4b0 [cifs]
>>>>> [36368.187942] ? _raw_spin_unlock+0x16/0x30
>>>>> [36368.187947] ? preempt_count_add+0x67/0xb0
>>>>> [36368.187976] smb2_reconnect_server+0x1bb/0x350 [cifs]
>>>>> [36368.187984] process_one_work+0x188/0x3a0
>>>>> [36368.187990] worker_thread+0x4c/0x3a0
>>>>> [36368.187994] ? preempt_count_add+0x67/0xb0
>>>>> [36368.187998] ? process_one_work+0x3a0/0x3a0
>>>>> [36368.188001] kthread+0xf8/0x130
>>>>> [36368.188005] ? kthread_create_worker_on_cpu+0x70/0x70
>>>>> [36368.188009] ret_from_fork+0x35/0x40
>>>>> [36368.188014] INFO: task puppet:3836 blocked for more than 120 seconds.
>>>>> [36368.188064] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36368.188114] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36368.188182] puppet D 0 3836 541 0x00000000
>>>>> [36368.188186] Call Trace:
>>>>> [36368.188191] ? __schedule+0x338/0x850
>>>>> [36368.188196] schedule+0x3c/0x90
>>>>> [36368.188200] schedule_preempt_disabled+0x14/0x20
>>>>> [36368.188205] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36368.188208] ? __switch_to_asm+0x34/0x70
>>>>> [36368.188211] ? __switch_to_asm+0x40/0x70
>>>>> [36368.188215] ? try_module_get+0x68/0x100
>>>>> [36368.188244] ? smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36368.188271] smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36368.188277] ? _raw_spin_unlock_irq+0x1d/0x30
>>>>> [36368.188280] ? finish_task_switch+0x7d/0x290
>>>>> [36368.188283] ? __switch_to_asm+0x40/0x70
>>>>> [36368.188310] smb2_plain_req_init+0x30/0x240 [cifs]
>>>>> [36368.188314] ? _raw_spin_lock_irqsave+0x25/0x50
>>>>> [36368.188342] SMB2_open_init+0x6d/0x7c0 [cifs]
>>>>> [36368.188346] ? _raw_spin_lock+0x13/0x30
>>>>> [36368.188376] ? cifs_mid_q_entry_release+0x15/0x40 [cifs]
>>>>> [36368.188405] ? SMB2_open+0x150/0x520 [cifs]
>>>>> [36368.188432] SMB2_open+0x150/0x520 [cifs]
>>>>> [36368.188440] ? sched_clock+0x5/0x10
>>>>> [36368.188470] ? open_shroot+0x12f/0x200 [cifs]
>>>>> [36368.188497] open_shroot+0x12f/0x200 [cifs]
>>>>> [36368.188503] ? __follow_mount_rcu.isra.31+0x3c/0xf0
>>>>> [36368.188534] smb2_query_path_info+0x93/0x220 [cifs]
>>>>> [36368.188539] ? walk_component+0x48/0x360
>>>>> [36368.188569] cifs_get_inode_info+0x580/0xb10 [cifs]
>>>>> [36368.188574] ? filename_lookup+0xf8/0x1a0
>>>>> [36368.188601] ? build_path_from_dentry_optional_prefix+0x1e9/0x440 [cifs]
>>>>> [36368.188630] cifs_revalidate_dentry_attr+0xdc/0x3e0 [cifs]
>>>>> [36368.188659] cifs_getattr+0x5b/0x1b0 [cifs]
>>>>> [36368.188664] vfs_statx+0x89/0xe0
>>>>> [36368.188670] __do_sys_newlstat+0x39/0x70
>>>>> [36368.188677] do_syscall_64+0x55/0x100
>>>>> [36368.188681] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>>>> [36368.188684] RIP: 0033:0x7f562d3a0335
>>>>> [36368.188689] Code: Bad RIP value.
>>>>> [36368.188691] RSP: 002b:00007ffc6bbc4398 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
>>>>> [36368.188695] RAX: ffffffffffffffda RBX: 00007ffc6bbc43b0 RCX: 00007f562d3a0335
>>>>> [36368.188696] RDX: 00007ffc6bbc43b0 RSI: 00007ffc6bbc43b0 RDI: 000055e4e5e1bd50
>>>>> [36368.188698] RBP: 000055e4e2eb65e0 R08: 0000000000000002 R09: 000055e4e2eb69e0
>>>>> [36368.188700] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
>>>>> [36368.188702] R13: 000055e4e2ef7258 R14: 000055e4e2ef8810 R15: 000055e4e2f92ad0
>>>>> [36489.006262] INFO: task node_exporter:3567 blocked for more than 120 seconds.
>>>>> [36489.006300] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36489.006329] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36489.006458] node_exporter D 0 3567 1 0x00000000
>>>>> [36489.006461] Call Trace:
>>>>> [36489.006470] ? __schedule+0x338/0x850
>>>>> [36489.006474] ? preempt_count_add+0x67/0xb0
>>>>> [36489.006476] schedule+0x3c/0x90
>>>>> [36489.006478] schedule_preempt_disabled+0x14/0x20
>>>>> [36489.006480] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36489.006485] ? try_module_get+0x68/0x100
>>>>> [36489.006515] ? smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36489.006531] smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36489.006547] smb2_plain_req_init+0x30/0x240 [cifs]
>>>>> [36489.006549] ? __switch_to_asm+0x34/0x70
>>>>> [36489.006550] ? __switch_to_asm+0x40/0x70
>>>>> [36489.006565] SMB2_open_init+0x6d/0x7c0 [cifs]
>>>>> [36489.006581] ? smb2_queryfs+0x13d/0x350 [cifs]
>>>>> [36489.006583] ? lookup_fast+0xc8/0x2e0
>>>>> [36489.006597] smb2_queryfs+0x13d/0x350 [cifs]
>>>>> [36489.006599] ? lookup_fast+0xc8/0x2e0
>>>>> [36489.006602] ? ___cache_free+0x31/0x2e0
>>>>> [36489.006604] ? terminate_walk+0x93/0x100
>>>>> [36489.006619] ? cifs_statfs+0xad/0x300 [cifs]
>>>>> [36489.006632] cifs_statfs+0xad/0x300 [cifs]
>>>>> [36489.006635] statfs_by_dentry+0x6a/0x90
>>>>> [36489.006637] vfs_statfs+0x16/0xc0
>>>>> [36489.006639] user_statfs+0x50/0xa0
>>>>> [36489.006641] __do_sys_statfs+0x20/0x50
>>>>> [36489.006645] do_syscall_64+0x55/0x100
>>>>> [36489.006647] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>>>> [36489.006649] RIP: 0033:0x4a5c20
>>>>> [36489.006654] Code: Bad RIP value.
>>>>> [36489.006655] RSP: 002b:000000c0003ef490 EFLAGS: 00000206 ORIG_RAX: 0000000000000089
>>>>> [36489.006657] RAX: ffffffffffffffda RBX: 000000c00002a000 RCX: 00000000004a5c20
>>>>> [36489.006658] RDX: 0000000000000000 RSI: 000000c0003ef5c0 RDI: 000000c0004510e0
>>>>> [36489.006659] RBP: 000000c0003ef4f0 R08: 0000000000000000 R09: 0000000000000000
>>>>> [36489.006660] R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffff
>>>>> [36489.006661] R13: 0000000000000088 R14: 0000000000000087 R15: 0000000000000100
>>>>> [36489.006675] INFO: task kworker/1:2:32265 blocked for more than 120 seconds.
>>>>> [36489.006812] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36489.006940] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36489.007076] kworker/1:2 D 0 32265 2 0x80000000
>>>>> [36489.007100] Workqueue: cifsiod smb2_reconnect_server [cifs]
>>>>> [36489.007101] Call Trace:
>>>>> [36489.007105] ? __schedule+0x338/0x850
>>>>> [36489.007107] schedule+0x3c/0x90
>>>>> [36489.007109] schedule_preempt_disabled+0x14/0x20
>>>>> [36489.007111] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36489.007124] ? SMB2_sess_auth_rawntlmssp_authenticate+0x69/0x170 [cifs]
>>>>> [36489.007134] ? SMB2_sess_setup+0x17f/0x2c0 [cifs]
>>>>> [36489.007141] ? cifs_mark_open_files_invalid+0x54/0xa0 [cifs]
>>>>> [36489.007143] ? _raw_spin_unlock+0x16/0x30
>>>>> [36489.007150] cifs_mark_open_files_invalid+0x54/0xa0 [cifs]
>>>>> [36489.007159] smb2_reconnect+0x2d6/0x4b0 [cifs]
>>>>> [36489.007161] ? _raw_spin_unlock+0x16/0x30
>>>>> [36489.007163] ? preempt_count_add+0x67/0xb0
>>>>> [36489.007172] smb2_reconnect_server+0x1bb/0x350 [cifs]
>>>>> [36489.007176] process_one_work+0x188/0x3a0
>>>>> [36489.007178] worker_thread+0x4c/0x3a0
>>>>> [36489.007179] ? preempt_count_add+0x67/0xb0
>>>>> [36489.007180] ? process_one_work+0x3a0/0x3a0
>>>>> [36489.007181] kthread+0xf8/0x130
>>>>> [36489.007183] ? kthread_create_worker_on_cpu+0x70/0x70
>>>>> [36489.007184] ret_from_fork+0x35/0x40
>>>>> [36489.007186] INFO: task puppet:3836 blocked for more than 120 seconds.
>>>>> [36489.007294] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36489.007409] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36489.007540] puppet D 0 3836 541 0x00000000
>>>>> [36489.007541] Call Trace:
>>>>> [36489.007545] ? __schedule+0x338/0x850
>>>>> [36489.007548] schedule+0x3c/0x90
>>>>> [36489.007550] schedule_preempt_disabled+0x14/0x20
>>>>> [36489.007552] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36489.007553] ? __switch_to_asm+0x34/0x70
>>>>> [36489.007555] ? __switch_to_asm+0x40/0x70
>>>>> [36489.007558] ? try_module_get+0x68/0x100
>>>>> [36489.007580] ? smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36489.007594] smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36489.007596] ? _raw_spin_unlock_irq+0x1d/0x30
>>>>> [36489.007598] ? finish_task_switch+0x7d/0x290
>>>>> [36489.007600] ? __switch_to_asm+0x40/0x70
>>>>> [36489.007613] smb2_plain_req_init+0x30/0x240 [cifs]
>>>>> [36489.007615] ? _raw_spin_lock_irqsave+0x25/0x50
>>>>> [36489.007628] SMB2_open_init+0x6d/0x7c0 [cifs]
>>>>> [36489.007630] ? _raw_spin_lock+0x13/0x30
>>>>> [36489.007644] ? cifs_mid_q_entry_release+0x15/0x40 [cifs]
>>>>> [36489.007658] ? SMB2_open+0x150/0x520 [cifs]
>>>>> [36489.007672] SMB2_open+0x150/0x520 [cifs]
>>>>> [36489.007677] ? sched_clock+0x5/0x10
>>>>> [36489.007692] ? open_shroot+0x12f/0x200 [cifs]
>>>>> [36489.007707] open_shroot+0x12f/0x200 [cifs]
>>>>> [36489.007711] ? __follow_mount_rcu.isra.31+0x3c/0xf0
>>>>> [36489.007727] smb2_query_path_info+0x93/0x220 [cifs]
>>>>> [36489.007729] ? walk_component+0x48/0x360
>>>>> [36489.007745] cifs_get_inode_info+0x580/0xb10 [cifs]
>>>>> [36489.007748] ? filename_lookup+0xf8/0x1a0
>>>>> [36489.007762] ? build_path_from_dentry_optional_prefix+0x1e9/0x440 [cifs]
>>>>> [36489.007778] cifs_revalidate_dentry_attr+0xdc/0x3e0 [cifs]
>>>>> [36489.007791] cifs_getattr+0x5b/0x1b0 [cifs]
>>>>> [36489.007794] vfs_statx+0x89/0xe0
>>>>> [36489.007797] __do_sys_newlstat+0x39/0x70
>>>>> [36489.007801] do_syscall_64+0x55/0x100
>>>>> [36489.007802] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>>>> [36489.007805] RIP: 0033:0x7f562d3a0335
>>>>> [36489.007808] Code: Bad RIP value.
>>>>> [36489.007809] RSP: 002b:00007ffc6bbc4398 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
>>>>> [36489.007811] RAX: ffffffffffffffda RBX: 00007ffc6bbc43b0 RCX: 00007f562d3a0335
>>>>> [36489.007812] RDX: 00007ffc6bbc43b0 RSI: 00007ffc6bbc43b0 RDI: 000055e4e5e1bd50
>>>>> [36489.007813] RBP: 000055e4e2eb65e0 R08: 0000000000000002 R09: 000055e4e2eb69e0
>>>>> [36489.007814] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
>>>>> [36489.007815] R13: 000055e4e2ef7258 R14: 000055e4e2ef8810 R15: 000055e4e2f92ad0
>>>>> [36609.825705] INFO: task node_exporter:3567 blocked for more than 120 seconds.
>>>>> [36609.825836] Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>> [36609.825869] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>>>> [36609.825908] node_exporter D 0 3567 1 0x00000000
>>>>> [36609.825910] Call Trace:
>>>>> [36609.825919] ? __schedule+0x338/0x850
>>>>> [36609.825922] ? preempt_count_add+0x67/0xb0
>>>>> [36609.825925] schedule+0x3c/0x90
>>>>> [36609.825927] schedule_preempt_disabled+0x14/0x20
>>>>> [36609.825929] __mutex_lock.isra.7+0x19f/0x540
>>>>> [36609.825933] ? try_module_get+0x68/0x100
>>>>> [36609.825960] ? smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36609.825979] smb2_reconnect+0x1d7/0x4b0 [cifs]
>>>>> [36609.825999] smb2_plain_req_init+0x30/0x240 [cifs]
>>>>> [36609.826001] ? __switch_to_asm+0x34/0x70
>>>>> [36609.826002] ? __switch_to_asm+0x40/0x70
>>>>> [36609.826020] SMB2_open_init+0x6d/0x7c0 [cifs]
>>>>> [36609.826039] ? smb2_queryfs+0x13d/0x350 [cifs]
>>>>> [36609.826040] ? lookup_fast+0xc8/0x2e0
>>>>> [36609.826057] smb2_queryfs+0x13d/0x350 [cifs]
>>>>> [36609.826060] ? lookup_fast+0xc8/0x2e0
>>>>> [36609.826064] ? ___cache_free+0x31/0x2e0
>>>>> [36609.826066] ? terminate_walk+0x93/0x100
>>>>> [36609.826084] ? cifs_statfs+0xad/0x300 [cifs]
>>>>> [36609.826099] cifs_statfs+0xad/0x300 [cifs]
>>>>> [36609.826103] statfs_by_dentry+0x6a/0x90
>>>>> [36609.826104] vfs_statfs+0x16/0xc0
>>>>> [36609.826106] user_statfs+0x50/0xa0
>>>>> [36609.826108] __do_sys_statfs+0x20/0x50
>>>>> [36609.826113] do_syscall_64+0x55/0x100
>>>>> [36609.826115] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>>>> [36609.826117] RIP: 0033:0x4a5c20
>>>>> [36609.826123] Code: Bad RIP value.
>>>>> [36609.826124] RSP: 002b:000000c0003ef490 EFLAGS: 00000206 ORIG_RAX: 0000000000000089
>>>>> [36609.826126] RAX: ffffffffffffffda RBX: 000000c00002a000 RCX: 00000000004a5c20
>>>>> [36609.826127] RDX: 0000000000000000 RSI: 000000c0003ef5c0 RDI: 000000c0004510e0
>>>>> [36609.826128] RBP: 000000c0003ef4f0 R08: 0000000000000000 R09: 0000000000000000
>>>>> [36609.826129] R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffff
>>>>> [36609.826130] R13: 0000000000000088 R14: 0000000000000087 R15: 0000000000000100
>>>>> [73117.654990] CIFS VFS: Send error in SessSetup = -126
>>>>>
>>>>> Regards, Martijn
>>>>>
>>>>>>
>>>>>> --
>>>>>> Best regards,
>>>>>> Pavel Shilovsky
>>>>>>
>>>>>> чт, 4 июл. 2019 г. в 06:36, Martijn de Gouw
>>>>>> <martijn.de.gouw@xxxxxxxxxxxxxxxxxxxxxxxxx>:
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> On 04-07-2019 13:22, Aurélien Aptel wrote:
>>>>>>>> Martijn de Gouw <martijn.de.gouw@xxxxxxxxxxxxxxxxxxxxxxxxx> writes:
>>>>>>>>>> Are there any kernel oops/panic with stack traces and register dumps in
>>>>>>>>>> the log?
>>>>>>>>>>
>>>>>>>>>> You can inspect the kernel stack trace of the hung processes (to see where
>>>>>>>>>> they are stuck) by printing the file /proc/<pid>/stack.
>>>>>>>>>
>>>>>>>>> These are the stacks of all processes that are D, most of them being df.
>>>>>>>>> I also attached the cifs Stats output below.
>>>>>>>>
>>>>>>>> Ok thanks. What about Oops or BUG or panic in dmesg logs, did you see
>>>>>>>> any?
>>>>>>>
>>>>>>> I did find the following messages in the dmesg of one of the servers:
>>>>>>>
>>>>>>> [ 4.797893] FS-Cache: Duplicate cookie detected
>>>>>>> [ 4.797915] FS-Cache: O-cookie c=000000001a791554 [p=00000000fb6f31ee fl=222 nc=0 na=1]
>>>>>>> [ 4.797934] FS-Cache: O-cookie d=0000000020a06fab n=00000000654600e7
>>>>>>> [ 4.797949] FS-Cache: O-key=[8] '020001bd0a010102'
>>>>>>> [ 4.797963] FS-Cache: N-cookie c=000000005d0bf4a5 [p=00000000fb6f31ee fl=2 nc=0 na=1]
>>>>>>> [ 4.797982] FS-Cache: N-cookie d=0000000020a06fab n=000000004e1e47aa
>>>>>>> [ 4.797997] FS-Cache: N-key=[8] '020001bd0a010102'
>>>>>>> [ 4.798643] FS-Cache: Duplicate cookie detected
>>>>>>> [ 4.798659] FS-Cache: O-cookie c=000000001a791554 [p=00000000fb6f31ee fl=222 nc=0 na=1]
>>>>>>> [ 4.798679] FS-Cache: O-cookie d=0000000020a06fab n=00000000654600e7
>>>>>>> [ 4.798695] FS-Cache: O-key=[8] '020001bd0a010102'
>>>>>>> [ 4.798714] FS-Cache: N-cookie c=00000000cbe44971 [p=00000000fb6f31ee fl=2 nc=0 na=1]
>>>>>>> [ 4.798733] FS-Cache: N-cookie d=0000000020a06fab n=00000000ab0e78a6
>>>>>>> [ 4.798747] FS-Cache: N-key=[8] '020001bd0a010102'
>>>>>>> [ 4.906667] FS-Cache: Netfs 'nfs' registered for caching
>>>>>>> [12738.729173] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [99125.480751] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [185517.295175] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [250515.749714] kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
>>>>>>> [250515.749740] BUG: unable to handle kernel paging request at ffff8ec52a6fe1d0
>>>>>>> [250515.749757] PGD 1b2602067 P4D 1b2602067 PUD 42dbff063 PMD 42a357063 PTE 800000042a6fe063
>>>>>>> [250515.749779] Oops: 0011 [#1] PREEMPT SMP PTI
>>>>>>> [250515.749792] CPU: 1 PID: 796 Comm: cifsd Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>>>> [250515.749812] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 09/19/2018
>>>>>>> [250515.749844] RIP: 0010:0xffff8ec52a6fe1d0
>>>>>>> [250515.749860] Code: ff ff 00 00 00 00 fd 01 00 00 00 7d 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <d0> e1 6f 2a c5 8e ff ff d0 e1 6f 2a c5 8e ff ff 80 70 82 2b c5 8e
>>>>>>> [250515.749914] RSP: 0018:ffff9e60c2e2bdc0 EFLAGS: 00010202
>>>>>>> [250515.749927] RAX: ffff8ec52a6fe1d0 RBX: ffff8ec526fce800 RCX: dead000000000200
>>>>>>> [250515.749944] RDX: ffff8ec52d3e6800 RSI: 0000000000000246 RDI: ffff8ec52a6fe198
>>>>>>> [250515.749962] RBP: ffff8ec52d3e6800 R08: 0000000000000002 R09: ffff8ec52a6fe170
>>>>>>> [250515.749979] R10: ffff9e60c2e2bc10 R11: ffff8ec527088000 R12: ffff8ec526fce9c0
>>>>>>> [250515.749997] R13: ffff8ec52d3e6800 R14: ffff9e60c2e2bdd8 R15: ffff8ec52d3e6b80
>>>>>>> [250515.750014] FS: 0000000000000000(0000) GS:ffff8ec52fa80000(0000) knlGS:0000000000000000
>>>>>>> [250515.750033] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>>>> [250515.750048] CR2: ffff8ec52a6fe1d0 CR3: 000000042a53c005 CR4: 00000000003606e0
>>>>>>> [250515.750100] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>>>>>>> [250515.750102] CIFS VFS: No task to wake, unknown frame received! NumMids 3
>>>>>>> [250515.750119] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>>>>>>> [250515.750120] Call Trace:
>>>>>>> [250515.750149] 00000000: 424d53fe 00010040 00000000 00000005 .SMB@...........
>>>>>>> [250515.750193] ? cifs_reconnect+0x337/0x880 [cifs]
>>>>>>> [250515.750201] ? cifs_handle_standard+0x169/0x190 [cifs]
>>>>>>> [250515.750216] 00000010: 10000009 00000098 00000db2 00000000 ................
>>>>>>> [250515.750234] ? cifs_demultiplex_thread+0x9e5/0xbc0 [cifs]
>>>>>>> [250515.750240] 00000020: 0000025c 00000001 640002e9 0000c81d \..........d....
>>>>>>> [250515.750259] ? finish_task_switch+0x7d/0x290
>>>>>>> [250515.750271] 00000030: 5a9e63f3 6204a9b0 587058e3 0d45419b .c.Z...b.XpX.AE.
>>>>>>> [250515.750295] ? cifs_handle_standard+0x190/0x190 [cifs]
>>>>>>> [250515.750728] CIFS VFS: No task to wake, unknown frame received! NumMids 3
>>>>>>> [250515.751200] ? kthread+0xf8/0x130
>>>>>>> [250515.751639] 00000000: 424d53fe 00010040 00000000 00000010 .SMB@...........
>>>>>>> [250515.752102] ? kthread_create_worker_on_cpu+0x70/0x70
>>>>>>> [250515.752554] 00000010: 0000000d 00000068 00000db3 00000000 ....h...........
>>>>>>> [250515.752997] ? ret_from_fork+0x35/0x40
>>>>>>> [250515.753429] 00000020: 0000025c 00000001 640002e9 0000c81d \..........d....
>>>>>>> [250515.753874] Modules linked in: cpufreq_userspace(E) cpufreq_powersave(E) cpufreq_conservative(E) arc4(E) ecb(E) md4(E) nfsv3(E) nfs_acl(E) nfs(E) sha512_ssse3(E) sha512_generic(E) lockd(E) cmac(E) grace(E) hmac(E) nls_utf8(E) cifs(E) ccm(E) dns_resolver(E) fscache(E) vmw_vsock_vmci_transport(E) vsock(E) sb_edac(E) crct10dif_pclmul(E) crc32_pclmul(E) ghash_clmulni_intel(E) aesni_intel(E) vmw_balloon(E) aes_x86_64(E) joydev(E) evdev(E) crypto_simd(E) vmwgfx(E) serio_raw(E) cryptd(E) glue_helper(E) ttm(E) sg(E) vmw_vmci(E) drm_kms_helper(E) drm(E) button(E) ac(E) auth_rpcgss(E) sunrpc(E) ip_tables(E) x_tables(E) autofs4(E) ext4(E) crc32c_generic(E) crc16(E) mbcache(E) jbd2(E) sr_mod(E) cdrom(E) ata_generic(E) sd_mod(E) ata_piix(E) crc32c_intel(E) psmouse(E) libata(E) vmw_pvscsi(E) vmxnet3(E) scsi_mod(E) i2c_piix4(E)
>>>>>>> [250515.754336] 00000030: 49d4fd21 858665a2 fde5288f 01d2d919 !..I.e...(......
>>>>>>> [250515.754766] CR2: ffff8ec52a6fe1d0
>>>>>>> [250515.758927] CIFS VFS: No task to wake, unknown frame received! NumMids 3
>>>>>>> [250515.759389] ---[ end trace 92ea62cd080150de ]---
>>>>>>> [250515.759879] 00000000: 424d53fe 00010040 00000000 00030006 .SMB@...........
>>>>>>> [250515.760357] RIP: 0010:0xffff8ec52a6fe1d0
>>>>>>> [250515.761841] Code: ff ff 00 00 00 00 fd 01 00 00 00 7d 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <d0> e1 6f 2a c5 8e ff ff d0 e1 6f 2a c5 8e ff ff 80 70 82 2b c5 8e
>>>>>>> [250515.763287] RSP: 0018:ffff9e60c2e2bdc0 EFLAGS: 00010202
>>>>>>> [250515.763778] RAX: ffff8ec52a6fe1d0 RBX: ffff8ec526fce800 RCX: dead000000000200
>>>>>>> [250515.764060] 00000010: 0000000d 00000000 00000db4 00000000 ................
>>>>>>> [250515.764310] RDX: ffff8ec52d3e6800 RSI: 0000000000000246 RDI: ffff8ec52a6fe198
>>>>>>> [250515.764311] RBP: ffff8ec52d3e6800 R08: 0000000000000002 R09: ffff8ec52a6fe170
>>>>>>> [250515.764312] R10: ffff9e60c2e2bc10 R11: ffff8ec527088000 R12: ffff8ec526fce9c0
>>>>>>> [250515.764314] R13: ffff8ec52d3e6800 R14: ffff9e60c2e2bdd8 R15: ffff8ec52d3e6b80
>>>>>>> [250515.765491] 00000020: 0000025c 00000001 640002e9 0000c81d \..........d....
>>>>>>> [250515.765836] FS: 0000000000000000(0000) GS:ffff8ec52fa80000(0000) knlGS:0000000000000000
>>>>>>> [250515.767899] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>>>> [250515.768367] CR2: ffff8ec52a6fe1d0 CR3: 000000042a53c005 CR4: 00000000003606e0
>>>>>>> [250515.768919] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>>>>>>> [250515.769419] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>>>>>>> [250515.769591] 00000030: 879543e1 572c0574 e53861ba 97ccc40b .C..t.,W.a8.....
>>>>>>> [271909.743603] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [358301.908585] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [444693.566453] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [531086.090040] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [617477.785390] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [703869.556705] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [790261.656853] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [876653.496928] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [963045.816742] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [1049437.566219] CIFS VFS: Send error in SessSetup = -126
>>>>>>>
>>>>>>>
>>>>>>> And from another server:
>>>>>>> [ 4.253091] FS-Cache: Duplicate cookie detected
>>>>>>> [ 4.253120] FS-Cache: O-cookie c=000000004cc29d26 [p=0000000017dbbbc0 fl=222 nc=0 na=1]
>>>>>>> [ 4.253153] FS-Cache: O-cookie d=00000000e8e68765 n=0000000012869fa7
>>>>>>> [ 4.253179] FS-Cache: O-key=[8] '020001bd0a010102'
>>>>>>> [ 4.253201] FS-Cache: N-cookie c=00000000c3bbbddd [p=0000000017dbbbc0 fl=2 nc=0 na=1]
>>>>>>> [ 4.253235] FS-Cache: N-cookie d=00000000e8e68765 n=00000000335882b3
>>>>>>> [ 4.253262] FS-Cache: N-key=[8] '020001bd0a010102'
>>>>>>> [ 4.254107] FS-Cache: Duplicate cookie detected
>>>>>>> [ 4.254130] FS-Cache: O-cookie c=000000004cc29d26 [p=0000000017dbbbc0 fl=222 nc=0 na=1]
>>>>>>> [ 4.254161] FS-Cache: O-cookie d=00000000e8e68765 n=0000000012869fa7
>>>>>>> [ 4.254185] FS-Cache: O-key=[8] '020001bd0a010102'
>>>>>>> [ 4.254230] FS-Cache: N-cookie c=000000000ec2f0bb [p=0000000017dbbbc0 fl=2 nc=0 na=1]
>>>>>>> [ 4.254261] FS-Cache: N-cookie d=00000000e8e68765 n=0000000024706210
>>>>>>> [ 4.254285] FS-Cache: N-key=[8] '020001bd0a010102'
>>>>>>> [ 4.329147] CIFS VFS: BAD_NETWORK_NAME: \\stor02.bk.prodrive.nl\userdata$
>>>>>>> [ 4.330107] CIFS VFS: cifs_mount failed w/return code = -2
>>>>>>> [65206.127542] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [151597.808064] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [237989.956447] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [324380.937984] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [402750.869518] kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
>>>>>>> [402750.869594] BUG: unable to handle kernel paging request at ffff909bf61609d0
>>>>>>> [402750.869650] PGD 1ac02067 P4D 1ac02067 PUD 1385f5063 PMD 136142063 PTE 8000000136160063
>>>>>>> [402750.869716] Oops: 0011 [#1] PREEMPT SMP PTI
>>>>>>> [402750.869753] CPU: 0 PID: 797 Comm: cifsd Tainted: G E 4.20.17-pd-4.20.y #20190611
>>>>>>> [402750.869818] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 09/19/2018
>>>>>>> [402750.869926] CIFS VFS: No task to wake, unknown frame received! NumMids 3
>>>>>>> [402750.869947] RIP: 0010:0xffff909bf61609d0
>>>>>>> [402750.870013] 00000000: 424d53fe 00010040 00000000 00000005 .SMB@...........
>>>>>>> [402750.870198] Code: ff ff 00 00 00 00 4e 01 00 00 00 7d 00 00 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <d0> 09 16 f6 9b 90 ff ff d0 09 16 f6 9b 90 ff ff c0 40 1f f2 9b 90
>>>>>>> [402750.870275] 00000010: 10000009 00000098 000002b5 00000000 ................
>>>>>>> [402750.870450] RSP: 0000:ffffa18d41adbd28 EFLAGS: 00010202
>>>>>>> [402750.870469] 00000020: 000001cd 00000001 44000cd9 0000c824 ...........D$...
>>>>>>> [402750.870509] RAX: ffff909bf61609d0 RBX: ffff909bf6c3f800 RCX: dead000000000200
>>>>>>> [402750.870511] RDX: ffff909bf74fa980 RSI: 0000000000000246 RDI: ffff909bf6160998
>>>>>>> [402750.870530] 00000030: 79955e4a 0dacb8eb 025edebd 4efa7788 J^.y......^..w.N
>>>>>>> [402750.870582] RBP: ffff909bf74fa980 R08: 0000000000000000 R09: ffff909bf6c3f970
>>>>>>> [402750.870585] R10: ffffa18d406a7cc0 R11: 0000000000000000 R12: ffff909bf6c3f9c0
>>>>>>> [402750.870605] CIFS VFS: No task to wake, unknown frame received! NumMids 3
>>>>>>> [402750.870656] R13: ffff909bf74fa980 R14: ffffa18d41adbd40 R15: ffff909bf74fa100
>>>>>>> [402750.870660] FS: 0000000000000000(0000) GS:ffff909bf9c00000(0000) knlGS:0000000000000000
>>>>>>> [402750.870677] 00000000: 424d53fe 00010040 00000000 00000010 .SMB@...........
>>>>>>> [402750.870731] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>>>> [402750.870733] CR2: ffff909bf61609d0 CR3: 0000000136e56004 CR4: 00000000003606f0
>>>>>>> [402750.870752] 00000010: 0000000d 00000068 000002b6 00000000 ....h...........
>>>>>>> [402750.870888] 00000020: 000001cd 00000001 44000cd9 0000c824 ...........D$...
>>>>>>> [402750.870894] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>>>>>>> [402750.870907] 00000030: f063942a cae9f6e1 d5327c26 91fc6f33 *.c.....&|2.3o..
>>>>>>> [402750.872321] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>>>>>>> [402750.872324] Call Trace:
>>>>>>> [402750.872381] ? cifs_reconnect+0x337/0x880 [cifs]
>>>>>>> [402750.872410] ? cifs_readv_from_socket+0x211/0x260 [cifs]
>>>>>>> [402750.875687] ? cifs_read_from_socket+0x4a/0x70 [cifs]
>>>>>>> [402750.876128] ? _raw_spin_unlock_irqrestore+0x20/0x40
>>>>>>> [402750.876555] ? try_to_wake_up+0x54/0x540
>>>>>>> [402750.876991] ? cifs_small_buf_get+0x16/0x20 [cifs]
>>>>>>> [402750.877426] ? cifs_demultiplex_thread+0xdd/0xbc0 [cifs]
>>>>>>> [402750.877834] ? finish_task_switch+0x7d/0x290
>>>>>>> [402750.878252] ? cifs_handle_standard+0x190/0x190 [cifs]
>>>>>>> [402750.878651] ? kthread+0xf8/0x130
>>>>>>> [402750.879034] ? kthread_create_worker_on_cpu+0x70/0x70
>>>>>>> [402750.879412] ? ret_from_fork+0x35/0x40
>>>>>>> [402750.879786] Modules linked in: cpufreq_conservative(E) cpufreq_powersave(E) cpufreq_userspace(E) arc4(E) ecb(E) md4(E) sha512_ssse3(E) sha512_generic(E) cmac(E) hmac(E) nfsv3(E) nfs_acl(E) nls_utf8(E) nfs(E) lockd(E) grace(E) cifs(E) ccm(E) dns_resolver(E) fscache(E) sb_edac(E) crct10dif_pclmul(E) crc32_pclmul(E) ghash_clmulni_intel(E) aesni_intel(E) aes_x86_64(E) crypto_simd(E) joydev(E) cryptd(E) vmw_balloon(E) evdev(E) glue_helper(E) serio_raw(E) vmwgfx(E) ttm(E) drm_kms_helper(E) sg(E) drm(E) vmw_vsock_vmci_transport(E) vsock(E) vmw_vmci(E) ac(E) button(E) auth_rpcgss(E) sunrpc(E) ip_tables(E) x_tables(E) autofs4(E) ext4(E) crc32c_generic(E) crc16(E) mbcache(E) jbd2(E) sr_mod(E) cdrom(E) sd_mod(E) ata_generic(E) ata_piix(E) vmw_pvscsi(E) libata(E) crc32c_intel(E) psmouse(E) vmxnet3(E) i2c_piix4(E) scsi_mod(E)
>>>>>>> [402750.883384] CR2: ffff909bf61609d0
>>>>>>> [402750.883783] ---[ end trace 08b06875e82513eb ]---
>>>>>>> [402750.884200] RIP: 0010:0xffff909bf61609d0
>>>>>>> [402750.884598] Code: ff ff 00 00 00 00 52 01 00 00 00 7d 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <d0> 09 16 f6 9b 90 ff ff d0 09 16 f6 9b 90 ff ff c0 40 1f f2 9b 90
>>>>>>> [402750.885822] RSP: 0000:ffffa18d41adbd28 EFLAGS: 00010202
>>>>>>> [402750.886229] RAX: ffff909bf61609d0 RBX: ffff909bf6c3f800 RCX: dead000000000200
>>>>>>> [402750.886651] RDX: ffff909bf74fa980 RSI: 0000000000000246 RDI: ffff909bf6160998
>>>>>>> [402750.887065] RBP: ffff909bf74fa980 R08: 0000000000000000 R09: ffff909bf6c3f970
>>>>>>> [402750.887478] R10: ffffa18d406a7cc0 R11: 0000000000000000 R12: ffff909bf6c3f9c0
>>>>>>> [402750.887883] R13: ffff909bf74fa980 R14: ffffa18d41adbd40 R15: ffff909bf74fa100
>>>>>>> [402750.888285] FS: 0000000000000000(0000) GS:ffff909bf9c00000(0000) knlGS:0000000000000000
>>>>>>> [402750.888692] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>>>>> [402750.889093] CR2: ffff909bf61609d0 CR3: 0000000136e56004 CR4: 00000000003606f0
>>>>>>> [402750.889559] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>>>>>>> [402750.889972] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>>>>>>> [410772.901264] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [497165.194662] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [583557.492304] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [669948.937016] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [756341.390112] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [842733.557002] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [929125.303428] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [1015516.629380] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [1101908.464697] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [1188300.531261] CIFS VFS: Send error in SessSetup = -126
>>>>>>> [1274692.583049] CIFS VFS: Send error in SessSetup = -126
>>>>>>>
>>>>>>>
>>>>>>>>
>>>>>>>> The individual stack dumps are pretty useful. Here is my theory:
>>>>>>>>
>>>>>>>>> pid: 9505
>>>>>>>>> syscall: 4 0x56550a2ec470 0x7ffede42e9a0 0x7ffede42e9a0 0x83a 0x3 0x20
>>>>>>>>> 0x7ffede42e8f8 0x7f7f8928f295
>>>>>>>>> [<0>] open_shroot+0x43/0x200 [cifs]
>>>>>>>>> [<0>] smb2_query_path_info+0x93/0x220 [cifs]
>>>>>>>>
>>>>>>>> Almost all of the processes have the same stack trace. They are stuck at
>>>>>>>> open_shroot()+0x43 which is probably
>>>>>>>>
>>>>>>>> mutex_lock(&tcon->crfid.fid_mutex);
>>>>>>>>
>>>>>>>> Then there are only 2 other processes stuck somewhere in the same code path
>>>>>>>> (open_shroot) but deeper, meaning they have the locks that the other
>>>>>>>> processes are waiting for:
>>>>>>>>
>>>>>>>>
>>>>>>>>> pid: 22858
>>>>>>>>> syscall: 4 0x564b46285d10 0x7ffcea3f9a80 0x7ffcea3f9a80 0x83a 0x3 0x20
>>>>>>>>> 0x7ffcea3f99d8 0x7f6cc78c7295
>>>>>>>>> [<0>] cifs_mark_open_files_invalid+0x54/0xa0 [cifs]
>>>>>>>>> [<0>] smb2_reconnect+0x2d6/0x4b0 [cifs]
>>>>>>>>> [<0>] smb2_plain_req_init+0x30/0x240 [cifs]
>>>>>>>>> [<0>] SMB2_open_init+0x6d/0x7c0 [cifs]
>>>>>>>>> [<0>] SMB2_open+0x150/0x520 [cifs]
>>>>>>>>> [<0>] open_shroot+0x12f/0x200 [cifs]
>>>>>>>>> [<0>] smb2_query_path_info+0x93/0x220 [cifs]
>>>>>>>>> [<0>] cifs_get_inode_info+0x580/0xb10 [cifs]
>>>>>>>>> [<0>] cifs_revalidate_dentry_attr+0xdc/0x3e0 [cifs]
>>>>>>>>> [<0>] cifs_getattr+0x5b/0x1b0 [cifs]
>>>>>>>>> [<0>] vfs_statx+0x89/0xe0
>>>>>>>>> [<0>] __do_sys_newstat+0x39/0x70
>>>>>>>>> [<0>] do_syscall_64+0x55/0x100
>>>>>>>>> [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>>>>>>>> [<0>] 0xffffffffffffffff
>>>>>>>>
>>>>>>>>
>>>>>>>>> pid: 20027
>>>>>>>>> syscall: 4 0x55a3c7d767d0 0x7ffe51432ab0 0x7ffe51432ab0 0x83a
>>>>>>>>> 0x55a3c7d75c40 0x20 0x7ffe51432a08 0x7f5f7c4e7295
>>>>>>>>> [<0>] cifs_mark_open_files_invalid+0x54/0xa0 [cifs]
>>>>>>>>> [<0>] smb2_reconnect+0x2d6/0x4b0 [cifs]
>>>>>>>>> [<0>] smb2_plain_req_init+0x30/0x240 [cifs]
>>>>>>>>> [<0>] SMB2_open_init+0x6d/0x7c0 [cifs]
>>>>>>>>> [<0>] SMB2_open+0x150/0x520 [cifs]
>>>>>>>>> [<0>] open_shroot+0x12f/0x200 [cifs]
>>>>>>>>> [<0>] smb2_query_path_info+0x93/0x220 [cifs]
>>>>>>>>> [<0>] cifs_get_inode_info+0x580/0xb10 [cifs]
>>>>>>>>> [<0>] cifs_revalidate_dentry_attr+0xdc/0x3e0 [cifs]
>>>>>>>>> [<0>] cifs_getattr+0x5b/0x1b0 [cifs]
>>>>>>>>> [<0>] vfs_statx+0x89/0xe0
>>>>>>>>> [<0>] __do_sys_newstat+0x39/0x70
>>>>>>>>> [<0>] do_syscall_64+0x55/0x100
>>>>>>>>> [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>>>>>>>>> [<0>] 0xffffffffffffffff
>>>>>>>>
>>>>>>>> Due to timeouts maybe the Open request needs
>>>>>>>> to reconnect the server/ses/tcon and to do this it calls
>>>>>>>> cifs_mark_open_files_invalid() and gets stuck somewhere there.
>>>>>>>>
>>>>>>>> spin_lock(&tcon->open_file_lock);
>>>>>>>> list_for_each_safe(tmp, tmp1, &tcon->openFileList) {
>>>>>>>> open_file = list_entry(tmp, struct cifsFileInfo, tlist);
>>>>>>>> open_file->invalidHandle = true;
>>>>>>>> open_file->oplock_break_cancelled = true;
>>>>>>>> }
>>>>>>>> spin_unlock(&tcon->open_file_lock);
>>>>>>>>
>>>>>>>> mutex_lock(&tcon->crfid.fid_mutex); <=== most likely here
>>>>>>>> tcon->crfid.is_valid = false;
>>>>>>>> memset(tcon->crfid.fid, 0, sizeof(struct cifs_fid));
>>>>>>>> mutex_unlock(&tcon->crfid.fid_mutex);
>>>>>>>>
>>>>>>>> I think these processes are trying to lock the same lock twice: one in
>>>>>>>> open_shroot() and since Open ends up having to reconnect, once again in
>>>>>>>> mark_open_files_invalid(). I think it's the same lock because I don't
>>>>>>>> see why the tcon pointers would be different in those 2 spots. Kernel
>>>>>>>> mutexes are not reentrant so this is a deadlock.
>>>>>>>
>>>>>>> Is there anything we can do about this? Is this maybe already fixed in newer kernels?
>>>>>>>
>>>>>>> Regards, Martijn
>>>>>>>
>>>>>>>>
>>>>>>>> Cheers,
>>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Martijn de Gouw
>>>>>>> Designer
>>>>>>> Prodrive Technologies
>>>>>>> Mobile: +31 63 17 76 161
>>>>>>> Phone: +31 40 26 76 200
>>>>>
>>>>> --
>>>>> Martijn de Gouw
>>>>> Designer
>>>>> Prodrive Technologies
>>>>> Mobile: +31 63 17 76 161
>>>>> Phone: +31 40 26 76 200
>>>>
>>>>
>>>>
>>>> --
>>>> Thanks,
>>>>
>>>> Steve
>>
>> --
>> Martijn de Gouw
>> Designer
>> Prodrive Technologies
>> Mobile: +31 63 17 76 161
>> Phone: +31 40 26 76 200
--
Martijn de Gouw
Designer
Prodrive Technologies
Mobile: +31 63 17 76 161
Phone: +31 40 26 76 200
