Re: regression in CIFS(?) between 4.17.14 and 4.18.0

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looks the same with or without signing (i)

** DFS, vers=2.1 ,sec=ntlmssp

[   50.772801] Key type dns_resolver registered
[   50.798894] Key type cifs.spnego registered
[   50.798917] Key type cifs.idmap registered
[   50.820848] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000000
[   50.820880] PGD 0 P4D 0
[   50.820893] Oops: 0000 [#1] SMP PTI
[   50.820910] CPU: 0 PID: 2129 Comm: mount.cifs Kdump: loaded Not
tainted 4.18.3-1.el7.elrepo.x86_64 #1
[   50.820940] Hardware name: VMware, Inc. VMware Virtual
Platform/440BX Desktop Reference Platform, BIOS 6.00 09/21/2015
[   50.820991] RIP: 0010:smb2_calc_signature+0x120/0x2f0 [cifs]
[   50.821011] Code: b1 00 01 00 00 49 8b bf 80 02 00 00 ba 10 00 00
00 e8 d4 2f e4 e0 85 c0 0f 85 8c 00 00 00 48 8b 85 78 ff ff ff ba 82
ff ff ff <48> 8b 00 f6 40 08 01 0f 84 b1 00 00 00 48 c7 c6 30 69 56 a0
48 c7
[   50.821088] RSP: 0018:ffffc9000174ba40 EFLAGS: 00010246
[   50.821107] RAX: 0000000000000000 RBX: ffff880078327540 RCX: 0000000000000000
[   50.821134] RDX: 00000000ffffff82 RSI: ffffc9000174b998 RDI: ffff88007bda4110
[   50.821160] RBP: ffffc9000174bac8 R08: ffffffffa0583280 R09: ffffffffa0583280
[   50.821184] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000174bbd0
[   50.821208] R13: ffffc9000174bbb0 R14: ffff880078327570 R15: ffff88007b544c00
[   50.821233] FS:  00007f40e2731780(0000) GS:ffff88007fc00000(0000)
knlGS:0000000000000000
[   50.821260] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   50.821280] CR2: 0000000000000000 CR3: 000000007959a004 CR4: 00000000001606f0
[   50.821346] Call Trace:
[   50.821364]  ? kmem_cache_alloc+0xae/0x1d0
[   50.821382]  ? mempool_alloc_slab+0x15/0x20
[   50.821410]  smb2_sign_rqst+0x36/0x50 [cifs]
[   50.821436]  smb2_setup_request+0x10f/0x1d0 [cifs]
[   50.821463]  cifs_send_recv+0xa6/0x3e0 [cifs]
[   50.821489]  SMB2_tcon+0x198/0x580 [cifs]
[   50.821513]  cifs_get_smb_ses+0x741/0xda0 [cifs]
[   50.821539]  cifs_mount+0x62f/0x1090 [cifs]
[   50.821558]  ? kstrdup+0x49/0x60
[   50.821579]  cifs_smb3_do_mount+0x11c/0x5d0 [cifs]
[   50.821603]  cifs_do_mount+0x11/0x20 [cifs]
[   50.821621]  mount_fs+0x3e/0x150
[   50.821636]  vfs_kern_mount+0x67/0x130
[   50.821652]  do_mount+0x1f0/0xca0
[   50.821666]  ksys_mount+0x83/0xd0
[   50.821680]  __x64_sys_mount+0x25/0x30
[   50.821697]  do_syscall_64+0x60/0x190
[   50.821713]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   50.821732] RIP: 0033:0x7f40e204f30a
[   50.821746] Code: 48 8b 0d 89 6b 2c 00 f7 d8 64 89 01 48 83 c8 ff
c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00
00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 56 6b 2c 00 f7 d8 64 89
01 48
[   50.821825] RSP: 002b:00007ffe3e9aaf18 EFLAGS: 00000206 ORIG_RAX:
00000000000000a5
[   50.821851] RAX: ffffffffffffffda RBX: 00007f40e274291a RCX: 00007f40e204f30a
[   50.822575] RDX: 00005566982d53b2 RSI: 00005566982d53f9 RDI: 00007ffe3e9ab494
[   50.823307] RBP: 00007ffe3e9ab489 R08: 0000556699a45060 R09: 00007f40e2731780
[   50.824027] R10: 0000000000000001 R11: 0000000000000206 R12: 00007f40e2740000
[   50.824796] R13: 0000556699a45060 R14: 00007f40e274290f R15: 0000000000000000
[   50.825554] Modules linked in: arc4 md4 nls_utf8 cifs ccm
dns_resolver binfmt_misc nf_conntrack_netbios_ns
nf_conntrack_broadcast xt_CT ip6t_rpfilter ipt_REJECT nf_reject_ipv4
ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat
ebtable_broute ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6
nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack
libcrc32c iptable_mangle iptable_security iptable_raw ebtable_filter
ebtables ip6table_filter ip6_tables iptable_filter
vmw_vsock_vmci_transport vsock sb_edac crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel pcbc aesni_intel crypto_simd cryptd glue_helper
intel_rapl_perf vmw_balloon joydev pcspkr input_leds sg vmw_vmci
i2c_piix4 auth_rpcgss tcp_bbr sch_fq sunrpc
[   50.830486]  ip_tables ext4 mbcache jbd2 sr_mod cdrom ata_generic
pata_acpi sd_mod crc32c_intel serio_raw vmwgfx vmxnet3 ata_piix
drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops
vmw_pvscsi ttm drm libata dm_mirror dm_region_hash dm_log dm_mod
[   50.832273] Dumping ftrace buffer:
[   50.833136]    (ftrace buffer empty)
[   50.833971] CR2: 0000000000000000
[   50.834818] ---[ end trace 0695b117c9de0188 ]---
[   50.835670] RIP: 0010:smb2_calc_signature+0x120/0x2f0 [cifs]
[   50.836507] Code: b1 00 01 00 00 49 8b bf 80 02 00 00 ba 10 00 00
00 e8 d4 2f e4 e0 85 c0 0f 85 8c 00 00 00 48 8b 85 78 ff ff ff ba 82
ff ff ff <48> 8b 00 f6 40 08 01 0f 84 b1 00 00 00 48 c7 c6 30 69 56 a0
48 c7
[   50.838308] RSP: 0018:ffffc9000174ba40 EFLAGS: 00010246
[   50.839203] RAX: 0000000000000000 RBX: ffff880078327540 RCX: 0000000000000000
[   50.840154] RDX: 00000000ffffff82 RSI: ffffc9000174b998 RDI: ffff88007bda4110
[   50.841042] RBP: ffffc9000174bac8 R08: ffffffffa0583280 R09: ffffffffa0583280
[   50.841921] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000174bbd0
[   50.842824] R13: ffffc9000174bbb0 R14: ffff880078327570 R15: ffff88007b544c00
[   50.843757] FS:  00007f40e2731780(0000) GS:ffff88007fc00000(0000)
knlGS:0000000000000000
[   50.844675] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   50.845568] CR2: 0000000000000000 CR3: 000000007959a004 CR4: 00000000001606f0


** DFS, vers=2.1, sec=ntlmsspi

[   39.193361] Key type dns_resolver registered
[   39.217764] Key type cifs.spnego registered
[   39.217791] Key type cifs.idmap registered
[   39.242647] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000000
[   39.242679] PGD 0 P4D 0
[   39.242693] Oops: 0000 [#1] SMP PTI
[   39.242709] CPU: 0 PID: 2117 Comm: mount.cifs Kdump: loaded Not
tainted 4.18.3-1.el7.elrepo.x86_64 #1
[   39.242740] Hardware name: VMware, Inc. VMware Virtual
Platform/440BX Desktop Reference Platform, BIOS 6.00 09/21/2015
[   39.242791] RIP: 0010:smb2_calc_signature+0x120/0x2f0 [cifs]
[   39.242811] Code: b1 00 01 00 00 49 8b bf 80 02 00 00 ba 10 00 00
00 e8 d4 2f e5 e0 85 c0 0f 85 8c 00 00 00 48 8b 85 78 ff ff ff ba 82
ff ff ff <48> 8b 00 f6 40 08 01 0f 84 b1 00 00 00 48 c7 c6 30 69 55 a0
48 c7
[   39.242892] RSP: 0018:ffffc900016fba40 EFLAGS: 00010246
[   39.242911] RAX: 0000000000000000 RBX: ffff88007b9e6540 RCX: 0000000000000000
[   39.242935] RDX: 00000000ffffff82 RSI: ffffc900016fb998 RDI: ffff8800361c1310
[   39.242959] RBP: ffffc900016fbac8 R08: ffffffffa0573280 R09: ffffffffa0573280
[   39.242983] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc900016fbbd0
[   39.243007] R13: ffffc900016fbbb0 R14: ffff88007b9e6570 R15: ffff88007b580000
[   39.243032] FS:  00007f7a7c8d2780(0000) GS:ffff88007fc00000(0000)
knlGS:0000000000000000
[   39.243059] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   39.243079] CR2: 0000000000000000 CR3: 000000007b5bc005 CR4: 00000000001606f0
[   39.243143] Call Trace:
[   39.243161]  ? kmem_cache_alloc+0xae/0x1d0
[   39.243179]  ? mempool_alloc_slab+0x15/0x20
[   39.243207]  smb2_sign_rqst+0x36/0x50 [cifs]
[   39.243234]  smb2_setup_request+0x10f/0x1d0 [cifs]
[   39.243261]  cifs_send_recv+0xa6/0x3e0 [cifs]
[   39.243288]  SMB2_tcon+0x198/0x580 [cifs]
[   39.243312]  cifs_get_smb_ses+0x741/0xda0 [cifs]
[   39.243337]  cifs_mount+0x62f/0x1090 [cifs]
[   39.243355]  ? kstrdup+0x49/0x60
[   39.243375]  cifs_smb3_do_mount+0x11c/0x5d0 [cifs]
[   39.243400]  cifs_do_mount+0x11/0x20 [cifs]
[   39.243417]  mount_fs+0x3e/0x150
[   39.243432]  vfs_kern_mount+0x67/0x130
[   39.243448]  do_mount+0x1f0/0xca0
[   39.243462]  ksys_mount+0x83/0xd0
[   39.243477]  __x64_sys_mount+0x25/0x30
[   39.243492]  do_syscall_64+0x60/0x190
[   39.243508]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   39.243527] RIP: 0033:0x7f7a7c1f030a
[   39.243540] Code: 48 8b 0d 89 6b 2c 00 f7 d8 64 89 01 48 83 c8 ff
c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00
00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 56 6b 2c 00 f7 d8 64 89
01 48
[   39.243619] RSP: 002b:00007fff2d469d48 EFLAGS: 00000206 ORIG_RAX:
00000000000000a5
[   39.243646] RAX: ffffffffffffffda RBX: 00007f7a7c8e391a RCX: 00007f7a7c1f030a
[   39.244368] RDX: 00005629843fd3b2 RSI: 00005629843fd3f9 RDI: 00007fff2d46b493
[   39.245089] RBP: 00007fff2d46b488 R08: 00005629849ce060 R09: 00007f7a7c8d2780
[   39.245808] R10: 0000000000000001 R11: 0000000000000206 R12: 00007f7a7c8e1000
[   39.246527] R13: 00005629849ce060 R14: 00007f7a7c8e390f R15: 0000000000000000
[   39.247242] Modules linked in: arc4 md4 nls_utf8 cifs ccm
dns_resolver binfmt_misc nf_conntrack_netbios_ns
nf_conntrack_broadcast xt_CT ip6t_rpfilter ipt_REJECT nf_reject_ipv4
ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat
ebtable_broute ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6
nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw iptable_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack
libcrc32c iptable_mangle iptable_security iptable_raw ebtable_filter
ebtables ip6table_filter ip6_tables iptable_filter
vmw_vsock_vmci_transport vsock sb_edac crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel pcbc aesni_intel crypto_simd cryptd glue_helper
intel_rapl_perf vmw_balloon pcspkr joydev input_leds sg vmw_vmci
i2c_piix4 auth_rpcgss tcp_bbr sch_fq sunrpc
[   39.252194]  ip_tables ext4 mbcache jbd2 sr_mod cdrom ata_generic
pata_acpi sd_mod crc32c_intel serio_raw vmwgfx drm_kms_helper
syscopyarea sysfillrect sysimgblt fb_sys_fops ttm vmxnet3 ata_piix
vmw_pvscsi drm libata dm_mirror dm_region_hash dm_log dm_mod
[   39.253982] Dumping ftrace buffer:
[   39.254845]    (ftrace buffer empty)
[   39.255680] CR2: 0000000000000000
[   39.256525] ---[ end trace 69f6a67b269cf41c ]---
[   39.257416] RIP: 0010:smb2_calc_signature+0x120/0x2f0 [cifs]
[   39.258256] Code: b1 00 01 00 00 49 8b bf 80 02 00 00 ba 10 00 00
00 e8 d4 2f e5 e0 85 c0 0f 85 8c 00 00 00 48 8b 85 78 ff ff ff ba 82
ff ff ff <48> 8b 00 f6 40 08 01 0f 84 b1 00 00 00 48 c7 c6 30 69 55 a0
48 c7
[   39.260030] RSP: 0018:ffffc900016fba40 EFLAGS: 00010246
[   39.260914] RAX: 0000000000000000 RBX: ffff88007b9e6540 RCX: 0000000000000000
[   39.261807] RDX: 00000000ffffff82 RSI: ffffc900016fb998 RDI: ffff8800361c1310
[   39.262688] RBP: ffffc900016fbac8 R08: ffffffffa0573280 R09: ffffffffa0573280
[   39.263566] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc900016fbbd0
[   39.264486] R13: ffffc900016fbbb0 R14: ffff88007b9e6570 R15: ffff88007b580000
[   39.265366] FS:  00007f7a7c8d2780(0000) GS:ffff88007fc00000(0000)
knlGS:0000000000000000
[   39.266285] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   39.267186] CR2: 0000000000000000 CR3: 000000007b5bc005 CR4: 00000000001606f0
On Fri, Aug 17, 2018 at 4:14 PM Steve French <smfrench@xxxxxxxxx> wrote:
>
> Did you try it (2.0 dfs) with signing disabled?
>
> On Fri, Aug 17, 2018, 11:53 Steve French <smfrench@xxxxxxxxx> wrote:
>>
>> 4.18.1 (last stable release) apparently does not include the fix, but
>> I would expect it in 4.18.2. See
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/log/fs/cifs?h=linux-4.18.y
>> On Fri, Aug 17, 2018 at 11:41 AM Pavel Shilovsky <piastryyy@xxxxxxxxx> wrote:
>> >
>> > пт, 17 авг. 2018 г. в 8:07, Robin P. Blanchard <robin.blanchard@xxxxxxxxx>:
>> > >
>> > > # sysctl -w kernel.panic_on_oops=0
>> > > # sysctl -w kernel.ftrace_dump_on_oops=1
>> > >
>> > > vers=2.1
>> > >
>> > > fs/cifs/cifsfs.c: Devname: -REDACTED- flags: 1
>> > > fs/cifs/connect.c: Username: -REDACTED-
>> > > fs/cifs/connect.c: file mode: 0x1ed  dir mode: 0x1ed
>> > > fs/cifs/connect.c: CIFS VFS: in cifs_mount as Xid: 46 with uid: 0
>> > > fs/cifs/connect.c: UNC: -REDACTED-
>> > > fs/cifs/connect.c: Socket created
>> > > fs/cifs/connect.c: sndbuf 16384 rcvbuf 87380 rcvtimeo 0x1b58
>> > > fs/cifs/connect.c: CIFS VFS: in cifs_get_smb_ses as Xid: 47 with uid: 0
>> > > fs/cifs/connect.c: Existing smb sess not found
>> > > fs/cifs/smb2pdu.c: Negotiate protocol
>> > > fs/cifs/transport.c: Sending smb: smb_len=106
>> > > fs/cifs/connect.c: Demultiplex PID: 11712
>> > > fs/cifs/connect.c: RFC1002 header 0xf8
>> > > fs/cifs/smb2misc.c: SMB2 data length 120 offset 128
>> > > fs/cifs/smb2misc.c: SMB2 len 248
>> > > fs/cifs/transport.c: cifs_sync_mid_result: cmd=0 mid=0 state=4
>> > > fs/cifs/misc.c: Null buffer passed to cifs_small_buf_release
>> > > fs/cifs/smb2pdu.c: mode 0x3
>> > > fs/cifs/smb2pdu.c: negotiated smb2.1 dialect
>> > > fs/cifs/asn1.c: OID len = 10 oid = 0x1 0x3 0x6 0x1
>> > > fs/cifs/asn1.c: OID len = 7 oid = 0x1 0x2 0x348 0xbb92
>> > > fs/cifs/asn1.c: OID len = 7 oid = 0x1 0x2 0x348 0x1bb92
>> > > fs/cifs/asn1.c: OID len = 8 oid = 0x1 0x2 0x348 0x1bb92
>> > > fs/cifs/asn1.c: OID len = 10 oid = 0x1 0x3 0x6 0x1
>> > > fs/cifs/connect.c: Security Mode: 0x3 Capabilities: 0x300007 TimeAdjust: 0
>> > > fs/cifs/smb2pdu.c: Session Setup
>> > > fs/cifs/smb2pdu.c: sess setup type 4
>> > > fs/cifs/transport.c: Sending smb: smb_len=124
>> > > fs/cifs/connect.c: RFC1002 header 0x13e
>> > > fs/cifs/smb2misc.c: SMB2 data length 246 offset 72
>> > > fs/cifs/smb2misc.c: SMB2 len 318
>> > > fs/cifs/transport.c: cifs_sync_mid_result: cmd=1 mid=1 state=4
>> > > Status code returned 0xc0000016 STATUS_MORE_PROCESSING_REQUIRED
>> > > fs/cifs/smb2maperror.c: Mapping SMB2 status code 0xc0000016 to POSIX err -5
>> > > fs/cifs/misc.c: Null buffer passed to cifs_small_buf_release
>> > > fs/cifs/smb2pdu.c: rawntlmssp session setup challenge phase
>> > > fs/cifs/transport.c: Sending smb: smb_len=426
>> > > fs/cifs/connect.c: RFC1002 header 0x48
>> > > fs/cifs/smb2misc.c: SMB2 data length 0 offset 72
>> > > fs/cifs/smb2misc.c: SMB2 len 73
>> > > fs/cifs/smb2misc.c: Calculated size 73 length 72 mismatch mid 2
>> > > fs/cifs/transport.c: cifs_sync_mid_result: cmd=1 mid=2 state=4
>> > > fs/cifs/misc.c: Null buffer passed to cifs_small_buf_release
>> > > fs/cifs/smb2pdu.c: SMB2/3 session established successfully
>> > > fs/cifs/connect.c: CIFS VFS: leaving cifs_get_smb_ses (xid = 47) rc = 0
>> > > fs/cifs/connect.c: CIFS VFS: in cifs_setup_ipc as Xid: 48 with uid: 0
>> > > fs/cifs/smb2pdu.c: TCON
>> > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
>> > > PGD 0 P4D 0
>> > > Oops: 0000 [#1] SMP PTI
>> > > CPU: 0 PID: 11706 Comm: mount.cifs Kdump: loaded Not tainted
>> > > 4.18.1-1.el7.elrepo.x86_64 #1
>> > > Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop
>> > > Reference Platform, BIOS 6.00 09/21/2015
>> > > RIP: 0010:smb2_calc_signature+0x120/0x2f0 [cifs]
>> > > Code: b1 00 01 00 00 49 8b bf 80 02 00 00 ba 10 00 00 00 e8 b4 86 e4
>> > > e0 85 c0 0f 85 8c 00 00 00 48 8b 85 78 ff ff ff ba 82 ff ff ff <48> 8b
>> > > 00 f6 40 08 01 0f 84 b1 00 00 00 48 c7 c6 30 09 56 a0 48 c7
>> > > RSP: 0018:ffffc90001d9fa40 EFLAGS: 00010246
>> > > RAX: 0000000000000000 RBX: ffff88007b23d8c0 RCX: 0000000000000000
>> > > RDX: 00000000ffffff82 RSI: ffffc90001d9f998 RDI: ffff880036196110
>> > > RBP: ffffc90001d9fac8 R08: ffffffffa057d280 R09: ffffffffa057d280
>> > > R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90001d9fbd0
>> > > R13: ffffc90001d9fbb0 R14: ffff88007b23d8f0 R15: ffff88007a491400
>> > > FS:  00007f6d81b77780(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
>> > > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > > CR2: 0000000000000000 CR3: 000000007a58c005 CR4: 00000000001606f0
>> > > Call Trace:
>> > >  ? kmem_cache_alloc+0xae/0x1d0
>> > >  ? mempool_alloc_slab+0x15/0x20
>> > >  smb2_sign_rqst+0x36/0x50 [cifs]
>> > >  smb2_setup_request+0x10f/0x1d0 [cifs]
>> > >  cifs_send_recv+0xa6/0x3e0 [cifs]
>> > >  SMB2_tcon+0x198/0x580 [cifs]
>> > >  ? __dynamic_pr_debug+0x8c/0xb0
>> > >  cifs_get_smb_ses+0x741/0xda0 [cifs]
>> > >  cifs_mount+0x62f/0x1090 [cifs]
>> > >  ? kstrdup+0x49/0x60
>> > >  cifs_smb3_do_mount+0x11c/0x5d0 [cifs]
>> > >  cifs_do_mount+0x11/0x20 [cifs]
>> > >  mount_fs+0x3e/0x150
>> > >  vfs_kern_mount+0x67/0x130
>> > >  do_mount+0x1f0/0xca0
>> > >  ? copy_mount_options+0xc0/0x140
>> > >  ksys_mount+0x83/0xd0
>> > >  __x64_sys_mount+0x25/0x30
>> > >  do_syscall_64+0x60/0x190
>> > >  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> > > RIP: 0033:0x7f6d8149530a
>> > > Code: 48 8b 0d 89 6b 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
>> > > 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d
>> > > 01 f0 ff ff 73 01 c3 48 8b 0d 56 6b 2c 00 f7 d8 64 89 01 48
>> > > RSP: 002b:00007ffeefc36ba8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
>> > > RAX: ffffffffffffffda RBX: 00007f6d81b8891a RCX: 00007f6d8149530a
>> > > RDX: 0000558d6cbfe3b2 RSI: 0000558d6cbfe3f9 RDI: 00007ffeefc3748f
>> > > RBP: 00007ffeefc37484 R08: 0000558d6dfc0090 R09: 00007f6d81b77780
>> > > R10: 0000000000000001 R11: 0000000000000202 R12: 00007f6d81b86000
>> > > R13: 0000558d6dfc0090 R14: 00007f6d81b8890f R15: 0000000000000000
>> > > Modules linked in: cmac arc4 md4 nls_utf8 cifs ccm dns_resolver
>> > > binfmt_misc nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT
>> > > ip6t_rpfilter ipt_REJECT nf_reject_ipv4 ip6t_REJECT nf_reject_ipv6
>> > > xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute ip6table_nat
>> > > nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle
>> > > ip6table_security ip6table_raw iptable_nat nf_conntrack_ipv4
>> > > nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack libcrc32c
>> > > iptable_mangle iptable_security iptable_raw ebtable_filter ebtables
>> > > ip6table_filter ip6_tables iptable_filter vmw_vsock_vmci_transport
>> > > vsock sb_edac crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc
>> > > aesni_intel crypto_simd cryptd glue_helper intel_rapl_perf vmw_balloon
>> > > pcspkr joydev input_leds sg vmw_vmci i2c_piix4 tcp_bbr sch_fq
>> > > auth_rpcgss sunrpc
>> > >  ip_tables ext4 mbcache jbd2 sr_mod cdrom ata_generic pata_acpi sd_mod
>> > > crc32c_intel serio_raw vmwgfx drm_kms_helper syscopyarea sysfillrect
>> > > sysimgblt fb_sys_fops vmxnet3 ttm vmw_pvscsi ata_piix drm libata
>> > > dm_mirror dm_region_hash dm_log dm_mod
>> > > Dumping ftrace buffer:
>> > >    (ftrace buffer empty)
>> > > CR2: 0000000000000000
>> > > ---[ end trace 8d3d1726ae979933 ]---
>> > > RIP: 0010:smb2_calc_signature+0x120/0x2f0 [cifs]
>> > > Code: b1 00 01 00 00 49 8b bf 80 02 00 00 ba 10 00 00 00 e8 b4 86 e4
>> > > e0 85 c0 0f 85 8c 00 00 00 48 8b 85 78 ff ff ff ba 82 ff ff ff <48> 8b
>> > > 00 f6 40 08 01 0f 84 b1 00 00 00 48 c7 c6 30 09 56 a0 48 c7
>> > > RSP: 0018:ffffc90001d9fa40 EFLAGS: 00010246
>> > > RAX: 0000000000000000 RBX: ffff88007b23d8c0 RCX: 0000000000000000
>> > > RDX: 00000000ffffff82 RSI: ffffc90001d9f998 RDI: ffff880036196110
>> > > RBP: ffffc90001d9fac8 R08: ffffffffa057d280 R09: ffffffffa057d280
>> > > R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90001d9fbd0
>> > > R13: ffffc90001d9fbb0 R14: ffff88007b23d8f0 R15: ffff88007a491400
>> > > FS:  00007f6d81b77780(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
>> > > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > > CR2: 0000000000000000 CR3: 000000007a58c005 CR4: 00000000001606f0
>> > >
>> > > On Fri, Aug 17, 2018 at 8:21 AM Robin P. Blanchard
>> > > <robin.blanchard@xxxxxxxxx> wrote:
>> > > >
>> > > > On Fri, Aug 17, 2018 at 7:52 AM Tom Talpey <ttalpey@xxxxxxxxxxxxx> wrote:
>> > > > >
>> > > > > > -----Original Message-----
>> > > > > > From: linux-cifs-owner@xxxxxxxxxxxxxxx <linux-cifs-owner@xxxxxxxxxxxxxxx> On
>> > > > > > Behalf Of Robin P. Blanchard
>> > > > > > Sent: Thursday, August 16, 2018 4:51 PM
>> > > > > > To: Steve French <smfrench@xxxxxxxxx>
>> > > > > > Cc: linux-cifs@xxxxxxxxxxxxxxx
>> > > > > > Subject: Re: regression in CIFS(?) between 4.17.14 and 4.18.0
>> > > > > >
>> > > > > > Correct.
>> > > > > >
>> > > > > > Interplay between DFS referrals and vers=2.[01] seems to be where we're at...
>> > > > >
>> > > > > Curious. What OS and SMB dialect are these DFS servers running?
>> > > >
>> > > > vers=2.0 and vers=2.1 trigger spontaneous reboots **with DFS pathing** to
>> > > > - Microsoft Windows Server 2008 R2 Enterprise
>> > > > - Microsoft Windows Server 2016 Datacenter
>> > > >
>> > > > mounting directly to one of the underlying DFS targets (above OSes) does NOT trigger spontaneous reboot.
>> > > >
>> > > > vers=3.0 and vers=3.11 does NOT trigger spontaneous reboot **with DFS pathing** to
>> > > > - Microsoft Windows Server 2016 Datacenter
>> > > >
>> > > >
>> > > > > The DFS referral protocol is pretty much identical across dialects, so it must be
>> > > > > something in the new mount/connection plumbing in the client that's going
>> > > > > flooey.
>> > > > >
>> > > > > Tom.
>> > > > >
>> > > > >
>> > > > > > On Thu, Aug 16, 2018 at 3:46 PM Steve French <smfrench@xxxxxxxxx> wrote:
>> > > > > > >
>> > > > > > > and to clarify - DFS referral to Windows 2016 works with 3.0 or later,
>> > > > > > > but reboots with 2.0 or 2.1?
>> > > > > > > On Thu, Aug 16, 2018 at 3:42 PM Robin P. Blanchard
>> > > > > > > <robin.blanchard@xxxxxxxxx> wrote:
>> > > > > > > >
>> > > > > > > > Summary of regression between 4.17.14 and 4.18.0
>> > > > > > > >
>> > > > > > > > pam_mount is/was red herring
>> > > > > > > >
>> > > > > > > > vers=2.0 and vers=2.1 trigger spontaneous reboots **using DFS pathing**
>> > > > > > to
>> > > > > > > > - Microsoft Windows Server 2008 R2 Enterprise
>> > > > > > > > - Microsoft Windows Server 2016 Datacenter
>> > > > > > > >
>> > > > > > > > mounting directly to one of the underlying DFS member servers does NOT
>> > > > > > > > trigger spontaneous reboot.
>> > > > >
>> >
>> > It might be the bug Aurelien fixed recently:
>> >
>> > commit a5c62f4833c2c8e6e0f35367b99b717b78f5c029
>> > Author: Aurelien Aptel <aaptel@xxxxxxxx>
>> > Date:   Thu Aug 2 16:39:52 2018 +0200
>> >
>> >     CIFS: fix uninitialized ptr deref in smb2 signing
>> >
>> >     server->secmech.sdeschmacsha256 is not properly initialized before
>> >     smb2_shash_allocate(), set shash after that call.
>> >
>> >     also fix typo in error message
>> >
>> >     Fixes: 8de8c4608fe9 ("cifs: Fix validation of signed data in smb2")
>> >
>> >     Signed-off-by: Aurelien Aptel <aaptel@xxxxxxxx>
>> >     Reviewed-by: Paulo Alcantara <palcantara@xxxxxxxx>
>> >     Reported-by: Xiaoli Feng <xifeng@xxxxxxxxxx>
>> >     Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
>> >     CC: Stable <stable@xxxxxxxxxxxxxxx>
>> >
>> >
>> > You can apply the fix or wait until v4.17.y stable kernel includes it.
>> >
>> > --
>> > Best regards,
>> > Pavel Shilovsky
>>
>>
>>
>> --
>> Thanks,
>>
>> Steve




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