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Subject4.0 kernel XFS filesystem crash when running AIM7's disk workload
Hi Dave,

When I was running the AIM7's disk workload on a 8-socket Westmere-EX
server with 4.0 kernel, the kernel crash. A set of small ramdisks were
created (ramdisk_size=271072). Those ramdisks were formatted with XFS
filesystem before the test began. The kernel log was:

XFS (ram12): Mounting V4 Filesystem
XFS (ram12): Log size 1424 blocks too small, minimum size is 1596 blocks
XFS (ram12): Log size out of supported range. Continuing onwards, but if
log hangs are
experienced then please report this message in the bug report.
XFS (ram12): Ending clean mount
XFS (ram13): Mounting V4 Filesystem
XFS (ram13): Log size 1424 blocks too small, minimum size is 1596 blocks
XFS (ram13): Log size out of supported range. Continuing onwards, but if
log hangs are
experienced then please report this message in the bug report.
XFS (ram13): Ending clean mount
XFS (ram14): Mounting V4 Filesystem
XFS (ram14): Log size 1424 blocks too small, minimum size is 1596 blocks
XFS (ram14): Log size out of supported range. Continuing onwards, but if
log hangs are
experienced then please report this message in the bug report.
XFS (ram14): Ending clean mount
XFS (ram15): Mounting V4 Filesystem
XFS (ram15): Log size 1424 blocks too small, minimum size is 1596 blocks
XFS (ram15): Log size out of supported range. Continuing onwards, but if
log hangs are
experienced then please report this message in the bug report.
XFS (ram15): Ending clean mount
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff812abd6d>] __memcpy+0xd/0x110
PGD 29f7655f067 PUD 29f75a80067 PMD 0
Oops: 0000 [#1] SMP
Modules linked in: xfs exportfs libcrc32c ebtable_nat ebtables
xt_CHECKSUM iptable_mangle bridge stp llc autofs4 ipt_REJECT
nf_reject_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 iptable_filter ip_tables
ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 xt_state
nf_conntrack ip6table_filter ip6_tables ipv6 vhost_net macvtap macvlan
vhost tun kvm_intel kvm ipmi_si ipmi_msghandler tpm_infineon iTCO_wdt
iTCO_vendor_support wmi acpi_cpufreq microcode pcspkr serio_raw qlcnic
be2net vxlan udp_tunnel ip6_udp_tunnel ses enclosure igb dca ptp
pps_core lpc_ich mfd_core hpilo hpwdt sg i7core_edac edac_core
netxen_nic ext4(E) jbd2(E) mbcache(E) sr_mod(E) cdrom(E) sd_mod(E)
lpfc(E) qla2xxx(E) scsi_transport_fc(E) pata_acpi(E) ata_generic(E)
ata_piix(E) hpsa(E) radeon(E) ttm(E) drm_kms_helper(E) drm(E)
i2c_algo_bit(E) i2c_core(E) dm_mirror(E) dm_region_hash(E) dm_log(E)
dm_mod(E)
CPU: 69 PID: 116603 Comm: xfsaild/ram5 Tainted: G E 4.0.0 #2
Hardware name: HP ProLiant DL980 G7, BIOS P66 07/30/2012
task: ffff8b9f7eeb4f80 ti: ffff8b9f7f1ac000 task.ti: ffff8b9f7f1ac000
RIP: 0010:[<ffffffff812abd6d>] [<ffffffff812abd6d>] __memcpy+0xd/0x110
RSP: 0018:ffff8b9f7f1afc10 EFLAGS: 00010206
RAX: ffff88102476a3cc RBX: ffff889ff2ab5000 RCX: 0000000000000005
RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88102476a3cc
RBP: ffff8b9f7f1afc18 R08: 0000000000000001 R09: ffff88102476a3cc
R10: ffff8a1f6c03ea80 R11: 0000000000000000 R12: ffff8b1ff1269400
R13: ffff8b1f64837c98 R14: ffff881038701200 R15: ffff88102476a300
FS: 0000000000000000(0000) GS:ffff8b1fffa40000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000029f7655e000 CR4: 00000000000006e0
Stack:
ffffffffa0ca8c41 ffff8b9f7f1afc68 ffffffffa0cc4803 ffff8b9f7f1afc68
ffffffffa0cd2777 ffff8b9f7f1afc68 ffff8b1ff1269400 ffff8a9f59022800
ffff8b1f7c932718 0000000000000003 ffff8a9f590228e4 ffff8b9f7f1afce8
Call Trace:
[<ffffffffa0ca8c41>] ? xfs_iflush_fork+0x181/0x240 [xfs]
[<ffffffffa0cc4803>] xfs_iflush_int+0x1f3/0x320 [xfs]
[<ffffffffa0cd2777>] ? kmem_alloc+0x87/0x100 [xfs]
[<ffffffffa0cc60a5>] xfs_iflush_cluster+0x295/0x380 [xfs]
[<ffffffffa0cc8ff4>] xfs_iflush+0xf4/0x1f0 [xfs]
[<ffffffffa0cda22a>] xfs_inode_item_push+0xea/0x130 [xfs]
[<ffffffffa0ce140d>] xfsaild_push+0x10d/0x500 [xfs]
[<ffffffff810b7c20>] ? lock_timer_base+0x70/0x70
[<ffffffffa0ce1898>] xfsaild+0x98/0x130 [xfs]
[<ffffffffa0ce1800>] ? xfsaild_push+0x500/0x500 [xfs]
[<ffffffffa0ce1800>] ? xfsaild_push+0x500/0x500 [xfs]
[<ffffffffa0ce1800>] ? xfsaild_push+0x500/0x500 [xfs]
[<ffffffff81074b50>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff815c5748>] ret_from_fork+0x58/0x90
[<ffffffff81074b50>] ? kthread_freezable_should_stop+0x70/0x70
Code: 0f b6 c0 5b c9 c3 0f 1f 84 00 00 00 00 00 e8 2b f9 ff ff 80 7b 25
00 74 c8 eb d3 90 90 90 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 <f3> 48
a5 89 d1 f3 a4 c3 20 4c 8b 06 4c 8b 4e 08 4c 8b 56 10 4c
RIP [<ffffffff812abd6d>] __memcpy+0xd/0x110
RSP <ffff8b9f7f1afc10>
CR2: 0000000000000000
---[ end trace fb8a4add69562a76 ]---

The xfs_iflush_fork+0x181/0x240 (385) IP address is at:

823 case XFS_DINODE_FMT_LOCAL:
824 if ((iip->ili_fields & dataflag[whichfork]) &&
0x00000000000023c0 <+336>: movslq %ecx,%rcx
0x00000000000023c3 <+339>: movswl 0x0(%rcx,%rcx,1),%eax
0x00000000000023cb <+347>: test %eax,0x90(%rdx)
0x00000000000023d1 <+353>: je 0x2350 <xfs_iflush_fork+224>
0x00000000000023da <+362>: test %edx,%edx
0x00000000000023dc <+364>: jle 0x2350 <xfs_iflush_fork+224>

825 (ifp->if_bytes > 0)) {
0x00000000000023d7 <+359>: mov (%r10),%edx

826 ASSERT(ifp->if_u1.if_data != NULL);
827 ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
828 memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes);
0x00000000000023e2 <+370>: mov 0x18(%r10),%rsi
0x00000000000023e6 <+374>: movslq %edx,%rdx
0x00000000000023e9 <+377>: mov %r9,%rdi
0x00000000000023ec <+380>: callq 0x23f1 <xfs_iflush_fork+385>

829 }
830 break;


xfs_iflush_int+0x1f3/0x320 (499) [xfs]:

flush_fork(ip, dip, iip, XFS_DATA_FORK);
0x0000000000000335 <+245>: xor %ecx,%ecx
0x0000000000000337 <+247>: mov %r13,%rdx
0x000000000000033a <+250>: mov %r15,%rsi
0x000000000000033d <+253>: mov %r12,%rdi
0x0000000000000340 <+256>: callq 0x345 <xfs_iflush_int+261>

3409 if (XFS_IFORK_Q(ip))
0x0000000000000345 <+261>: cmpb $0x0,0x14a(%r12)
0x000000000000034e <+270>: jne 0x420 <xfs_iflush_int+480>

3410 xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK);
0x0000000000000420 <+480>: mov $0x1,%ecx
0x0000000000000425 <+485>: mov %r13,%rdx
0x0000000000000428 <+488>: mov %r15,%rsi
0x000000000000042b <+491>: mov %r12,%rdi
0x000000000000042e <+494>: callq 0x433 <xfs_iflush_int+499>
0x0000000000000433 <+499>: jmpq 0x354 <xfs_iflush_int+276>
0x0000000000000438 <+504>: nopl 0x0(%rax,%rax,1)

The crash can be reproduced pretty consistently. Please let me know if
you need additional information.

Cheers,
Longman


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