BUG after md/raid10:md0: not enough operational mirrors.

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Hello,

I've just upgraded to linux-2.6.36.2 on this machine. Right after the
upgrade, I got an oops on boot which I was unable to capture. I'm
guessing that it left md state in a somewhat undefined place, although
I don't know what caused the initial oops. Anyways, on second boot:

[   17.336794] md: Scanned 11 and added 11 devices.
[   17.337050] md: autorun ...
[   17.337298] md: considering sdj1 ...
[   17.337552] md:  adding sdj1 ...
[   17.337800] md:  adding sdg1 ...
[   17.338047] md:  adding sdi1 ...
[   17.338295] md:  adding sdh1 ...
[   17.338548] md:  adding sdf1 ...
[   17.338797] md:  adding sde1 ...
[   17.339046] md:  adding sdk1 ...
[   17.339295] md:  adding sdd1 ...
[   17.339556] md:  adding sda1 ...
[   17.339808] md:  adding sdb1 ...
[   17.340058] md:  adding sdc1 ...
[   17.340305] md: created md0
[   17.340547] md: bind<sdc1>
[   17.340793] md: bind<sdb1>
[   17.341037] md: bind<sda1>
[   17.341287] md: bind<sdd1>
[   17.341543] md: bind<sdk1>
[   17.341790] md: bind<sde1>
[   17.342036] md: bind<sdf1>
[   17.342284] md: bind<sdh1>
[   17.342534] md: bind<sdi1>
[   17.342783] md: bind<sdg1>
[   17.343031] md: bind<sdj1>
[   17.343281] md: running:
<sdj1><sdg1><sdi1><sdh1><sdf1><sde1><sdk1><sdd1><sda1><sdb1><sdc1>
[   17.344151] md: kicking non-fresh sdj1 from array!
[   17.344406] md: unbind<sdj1>
[   17.348365] md: export_rdev(sdj1)
[   17.348613] md: kicking non-fresh sdg1 from array!
[   17.348852] md: unbind<sdg1>
[   17.356343] md: export_rdev(sdg1)
[   17.356589] md: kicking non-fresh sdi1 from array!
[   17.356827] md: unbind<sdi1>
[   17.364325] md: export_rdev(sdi1)
[   17.364582] md: kicking non-fresh sdh1 from array!
[   17.364831] md: unbind<sdh1>
[   17.372308] md: export_rdev(sdh1)
[   17.372563] md: kicking non-fresh sdf1 from array!
[   17.372812] md: unbind<sdf1>
[   17.380291] md: export_rdev(sdf1)
[   17.380551] md: kicking non-fresh sde1 from array!
[   17.380801] md: unbind<sde1>
[   17.388274] md: export_rdev(sde1)
[   17.388522] md: kicking non-fresh sdk1 from array!
[   17.388763] md: unbind<sdk1>
[   17.396256] md: export_rdev(sdk1)
[   17.397013] md/raid10:md0: not enough operational mirrors.
[   17.397364] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000014
[   17.397882] IP: [<ffffffff814ccc1f>] _raw_spin_lock_irq+0xa/0x1b
[   17.398162] PGD 0
[   17.398450] Oops: 0002 [#1] SMP
[   17.398749] last sysfs file:
[   17.398986] CPU 13
[   17.399022] Modules linked in:
[   17.399538]
[   17.399771] Pid: 1519, comm: md0_raid10 Not tainted 2.6.36.2 #2 X8DT3/X8DT3
[   17.400013] RIP: 0010:[<ffffffff814ccc1f>]  [<ffffffff814ccc1f>]
_raw_spin_lock_irq+0xa/0x1b
[   17.400510] RSP: 0018:ffff88033d151cc0  EFLAGS: 00010082
[   17.400750] RAX: 0000000000000100 RBX: 0000000000000000 RCX: 0000000000000000
[   17.400995] RDX: ffff88033e381650 RSI: 0000000000000000 RDI: 0000000000000014
[   17.401288] RBP: ffff88033d151cc0 R08: ffff88033d150000 R09: 0000000000000000
[   17.401531] R10: ffffffff81a7d7f0 R11: ffff88033e355dc8 R12: ffff88033d700d80
[   17.401774] R13: 0000000000000014 R14: 0000000000000000 R15: ffff88033d151e80
[   17.402018] FS:  0000000000000000(0000) GS:ffff88034e340000(0000)
knlGS:0000000000000000
[   17.402478] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   17.402718] CR2: 0000000000000014 CR3: 0000000001a05000 CR4: 00000000000006e0
[   17.402961] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   17.403252] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   17.403496] Process md0_raid10 (pid: 1519, threadinfo
ffff88033d150000, task ffff88033e381650)
[   17.403940] Stack:
[   17.404195]  ffff88033d151cf0 ffffffff81380efb ffff88033d151d10
0000000000000014
[   17.404536] <0> ffff88033d700d80 ffff88033e381650 ffff88033d151e50
ffffffff81381900
[   17.405141] <0> ffffffff81a1cd80 ffff88033e381650 ffff88033e381650
ffffffff814cb876
[   17.406019] Call Trace:
[   17.406279]  [<ffffffff81380efb>] flush_pending_writes+0x1c/0x8a
[   17.406524]  [<ffffffff81381900>] raid10d+0x69/0xe06
[   17.406765]  [<ffffffff814cb876>] ? schedule+0x61e/0x66b
[   17.407008]  [<ffffffff814cbc42>] ? schedule_timeout+0x22/0xbf
[   17.407299]  [<ffffffff81032a25>] ? finish_task_switch+0x3d/0xb0
[   17.407547]  [<ffffffff813936bd>] md_thread+0xf8/0x116
[   17.407791]  [<ffffffff81051e93>] ? autoremove_wake_function+0x0/0x38
[   17.408033]  [<ffffffff813935c5>] ? md_thread+0x0/0x116
[   17.408291]  [<ffffffff810519fb>] kthread+0x81/0x89
[   17.408534]  [<ffffffff81003854>] kernel_thread_helper+0x4/0x10
[   17.408777]  [<ffffffff8105197a>] ? kthread+0x0/0x89
[   17.409017]  [<ffffffff81003850>] ? kernel_thread_helper+0x0/0x10
[   17.409301] Code: eb f6 c9 c3 55 48 89 e5 9c 58 fa ba 00 01 00 00
f0 66 0f c1 17 38 f2 74 06 f3 90 8a 17 eb f6 c9 c3 55 48 89 e5 fa b8
00 01 00 00 <f0> 66 0f c1 07 38 e0 74 06 f3 90 8a 07 eb f6 c9 c3 55 48
89 e5
[   17.412131] RIP  [<ffffffff814ccc1f>] _raw_spin_lock_irq+0xa/0x1b
[   17.417553]  RSP <ffff88033d151cc0>
[   17.417789] CR2: 0000000000000014
[   17.418026] ---[ end trace 1dc7eeca43b701f8 ]---
[   17.418302] md0_raid10 used greatest stack depth: 4632 bytes left
[   17.418338] md: pers->run() failed ...
[   17.418342] md: do_md_run() returned -5
[   17.418344] md: md0 still in use.
[   17.418346] md: ... autorun DONE.

Shortly followed by:

[   18.572342] udev: starting version 149
[   18.572396] udevd (1612): /proc/1612/oom_adj is deprecated, please
use /proc/1612/oom_score_adj instead.
[   18.615329] BUG: unable to handle kernel paging request at 00000000000ffeb6
[   18.615645] IP: [<ffffffff8102a0c7>] __wake_up_common+0x29/0x76
[   18.615923] PGD 73cd4a067 PUD 73cd4b067 PMD 0
[   18.616264] Oops: 0000 [#2] SMP
[   18.616570] last sysfs file:
/sys/devices/pci0000:00/0000:00:1a.2/usb5/5-2/5-2:1.0/input/input2/name
[   18.617020] CPU 2
[   18.617057] Modules linked in:
[   18.617558]
[   18.617796] Pid: 1635, comm: udevd Tainted: G      D     2.6.36.2
#2 X8DT3/X8DT3
[   18.618242] RIP: 0010:[<ffffffff8102a0c7>]  [<ffffffff8102a0c7>]
__wake_up_common+0x29/0x76
[   18.618719] RSP: 0018:ffff88073cd69de8  EFLAGS: 00010096
[   18.618958] RAX: 00000000000ffeb6 RBX: ffff88033d700d90 RCX: 0000000000000000
[   18.619202] RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff88033d700d90
[   18.619447] RBP: ffff88073cd69e18 R08: 00000000000ffe9e R09: 000000000000000a
[   18.619691] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
[   18.619934] R13: 0000000000000001 R14: ffff88033d700d98 R15: 0000000000000000
[   18.620177] FS:  00007fcae5aba6f0(0000) GS:ffff880001c80000(0000)
knlGS:0000000000000000
[   18.620625] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.620886] CR2: 00000000000ffeb6 CR3: 000000073cd49000 CR4: 00000000000006e0
[   18.621146] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   18.621410] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   18.621761] Process udevd (pid: 1635, threadinfo ffff88073cd68000,
task ffff88073cd30770)
[   18.622238] Stack:
[   18.622487]  0000000300000000 ffff88033d700d90 0000000000000000
0000000000000001
[   18.622928] <0> 0000000000000296 0000000000000003 ffff88073cd69e58
ffffffff8102d080
[   18.623596] <0> ffff88073cd69ee8 ffff88033d10b400 0000000000000000
ffffffff81a44410
[   18.624514] Call Trace:
[   18.624816]  [<ffffffff8102d080>] __wake_up+0x38/0x50
[   18.625075]  [<ffffffff8138e297>] md_wakeup_thread+0x27/0x29
[   18.625319]  [<ffffffff8138f301>] mddev_unlock+0xa6/0xab
[   18.625605]  [<ffffffff8138f533>] md_attr_show+0x4c/0x58
[   18.625867]  [<ffffffff8112a83b>] sysfs_read_file+0xb2/0x131
[   18.626121]  [<ffffffff810dbd8e>] vfs_read+0xa8/0x100
[   18.626371]  [<ffffffff810dbeaa>] sys_read+0x47/0x70
[   18.626666]  [<ffffffff81002aab>] system_call_fastpath+0x16/0x1b
[   18.626928] Code: c9 c3 55 48 89 e5 41 57 4d 89 c7 41 56 4c 8d 77
08 41 55 41 54 41 89 d4 53 48 83 ec 08 89 75 d4 89 4d d0 48 8b 47 08
4c 8d 40 e8 <49> 8b 40 18 48 8d 58 e8 eb 2d 45 8b 28 4c 89 f9 8b 55 d0
8b 75
[   18.629848] RIP  [<ffffffff8102a0c7>] __wake_up_common+0x29/0x76
[   18.630139]  RSP <ffff88073cd69de8>
[   18.630386] CR2: 00000000000ffeb6
[   18.630680] ---[ end trace 1dc7eeca43b701f9 ]---

And then a watchdog:

[  230.799819] ------------[ cut here ]------------
[  230.800081] WARNING: at kernel/watchdog.c:240
watchdog_overflow_callback+0xa9/0xbb()
[  230.805856] Hardware name: X8DT3
[  230.806106] Watchdog detected hard LOCKUP on cpu 1
[  230.806147] Modules linked in: cifs kvm_intel kvm iTCO_wdt
iTCO_vendor_support i2c_i801
[  230.807114] Pid: 2594, comm: udevd Tainted: G      D     2.6.36.2 #2
[  230.807358] Call Trace:
[  230.807636]  <NMI>  [<ffffffff8107f1d2>] ?
watchdog_overflow_callback+0xa9/0xbb
[  230.808134]  [<ffffffff81038abf>] warn_slowpath_common+0x80/0x99
[  230.808382]  [<ffffffff81038bbb>] warn_slowpath_fmt+0x69/0x6b
[  230.808679]  [<ffffffff8107f1d2>] watchdog_overflow_callback+0xa9/0xbb
[  230.808938]  [<ffffffff8109ebeb>] __perf_event_overflow+0x189/0x1fc
[  230.809195]  [<ffffffff8109efcd>] perf_event_overflow+0x14/0x16
[  230.809448]  [<ffffffff81011b52>] intel_pmu_handle_irq+0x385/0x3ee
[  230.809744]  [<ffffffff814ce2c0>] perf_event_nmi_handler+0x6f/0xcf
[  230.810001]  [<ffffffff814cfdf2>] notifier_call_chain+0x33/0x5b
[  230.810249]  [<ffffffff814cfe3c>] atomic_notifier_call_chain+0x13/0x15
[  230.810499]  [<ffffffff814cfe6c>] notify_die+0x2e/0x30
[  230.810789]  [<ffffffff814cda31>] do_nmi+0x91/0x261
[  230.811042]  [<ffffffff814cd4fa>] nmi+0x1a/0x20
[  230.811290]  [<ffffffff814ccc0f>] ? _raw_spin_lock_irqsave+0x17/0x1d
[  230.811576]  <<EOE>>  [<ffffffff8102d06a>] __wake_up+0x22/0x50
[  230.811875]  [<ffffffff8138e297>] md_wakeup_thread+0x27/0x29
[  230.812125]  [<ffffffff8138f301>] mddev_unlock+0xa6/0xab
[  230.812373]  [<ffffffff8138f533>] md_attr_show+0x4c/0x58
[  230.812663]  [<ffffffff8112a83b>] sysfs_read_file+0xb2/0x131
[  230.812919]  [<ffffffff810dbd8e>] vfs_read+0xa8/0x100
[  230.813168]  [<ffffffff810dbeaa>] sys_read+0x47/0x70
[  230.813415]  [<ffffffff81002aab>] system_call_fastpath+0x16/0x1b
[  230.813706] ---[ end trace 1dc7eeca43b701fa ]---

I will be throwing out/rebuilding this raid shortly (it's used for
swap, no real data on it anyways), but thought it would be good to
report this. Let me know if I can provide any further details about
this system.

-- 
Ilia Mirkin
imirkin@xxxxxxxxxxxx

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