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
