So the latest kernel offered no change in behavior:
[ 2297.712508] BUG: unable to handle kernel NULL pointer dereference at
(null)
[ 2297.712513] IP: [< (null)>] (null)
[ 2297.712517] PGD 0
[ 2297.712520] Oops: 0010 [#1] SMP
[ 2297.712523] CPU 6
[ 2297.712524] Modules linked in: vesafb i7core_edac edac_core ioatdma tpm_tis
ghes lp hed joydev parport dm_round_robin usbhid hid mptsas mptscsih igb
mptbase scsi_transport_sas dca dm_multipath scsi_dh_alua [last unloaded:
scsi_wait_scan]
[ 2297.712538]
[ 2297.712541] Pid: 860, comm: jbd2/dm-7-8 Not tainted 3.0.0-12-server
#19-Ubuntu INTEL MFS5520VI Compute Module/MFS5520VI Compute Module
[ 2297.712545] RIP: 0010:[<0000000000000000>] [< (null)>]
(null)
[ 2297.712548] RSP: 0018:ffff880165f5f9a8 EFLAGS: 00010082
[ 2297.712552] RAX: ffff880164783680 RBX: ffff8801663072c0 RCX:
0000000000000000
[ 2297.712557] RDX: 0000000000000002 RSI: 0000000000000001 RDI:
ffff8801663072c0
[ 2297.712561] RBP: ffff880165f5f9c0 R08: 0000000000000000 R09:
0000000000000001
[ 2297.712566] R10: 6db6db6db6db6db7 R11: 0000000000000001 R12:
ffff8801663072c0
[ 2297.712570] R13: 0000000000000086 R14: ffffc90016267040 R15:
ffff8801663072c0
[ 2297.712575] FS: 0000000000000000(0000) GS:ffff88016fc60000(0000)
knlGS:0000000000000000
[ 2297.712581] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2297.712585] CR2: 0000000000000000 CR3: 0000000001c03000 CR4:
00000000000006e0
[ 2297.712589] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 2297.712594] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 2297.712599] Process jbd2/dm-7-8 (pid: 860, threadinfo ffff880165f5e000, task
ffff880164099720)
[ 2297.712604] Stack:
[ 2297.712606] ffffffff812c822a ffffc90016267040 ffff880165cbdaa8
ffff880165f5fa10
[ 2297.712613] ffffffff812c8383 ffff880165f5fa20 00000002663072c0
ffff880165f5fa10
[ 2297.712620] ffff880165cbdaa8 ffff8801663072c0 0000000000000086
ffffc90016267040
[ 2297.712627] Call Trace:
[ 2297.712637] [<ffffffff812c822a>] ? elv_drain_elevator+0x2a/0x80
[ 2297.712644] [<ffffffff812c8383>] __elv_add_request+0x103/0x290
[ 2297.712650] [<ffffffff812cc8fa>] blk_insert_cloned_request+0x5a/0x90
[ 2297.712657] [<ffffffff814abbce>] dm_dispatch_request+0x3e/0x70
[ 2297.712663] [<ffffffff814ad361>] map_request+0xd1/0x140
[ 2297.712668] [<ffffffff814ad486>] dm_request_fn+0xb6/0x140
[ 2297.712674] [<ffffffff812cb54a>] queue_unplugged+0x4a/0xe0
[ 2297.712681] [<ffffffff812cfc6d>] blk_flush_plug_list+0x1ed/0x250
[ 2297.712687] [<ffffffff812cfce8>] blk_finish_plug+0x18/0x50
[ 2297.712694] [<ffffffff811136c6>] generic_writepages+0x56/0x70
[ 2297.712700] [<ffffffff81245b0e>] journal_submit_data_buffers+0xbe/0x1b0
[ 2297.712707] [<ffffffff812483bd>] ? journal_clean_one_cp_list+0x5d/0xa0
[ 2297.712713] [<ffffffff812461d7>]
jbd2_journal_commit_transaction+0x2d7/0x1250
[ 2297.712721] [<ffffffff8104ca0e>] ? perf_event_task_sched_out+0x2e/0xa0
[ 2297.712727] [<ffffffff8104f412>] ? update_shares+0xc2/0xf0
[ 2297.712735] [<ffffffff815feabe>] ? _raw_spin_lock_irqsave+0x2e/0x40
[ 2297.712743] [<ffffffff8106e418>] ? lock_timer_base.isra.29+0x38/0x70
[ 2297.712748] [<ffffffff8106ee32>] ? try_to_del_timer_sync+0x92/0x130
[ 2297.712755] [<ffffffff8124af7b>] kjournald2+0xbb/0x220
[ 2297.712761] [<ffffffff81081700>] ? add_wait_queue+0x60/0x60
[ 2297.712766] [<ffffffff8124aec0>] ? commit_timeout+0x10/0x10
[ 2297.712771] [<ffffffff81080c5c>] kthread+0x8c/0xa0
[ 2297.712777] [<ffffffff81607d24>] kernel_thread_helper+0x4/0x10
[ 2297.712783] [<ffffffff81080bd0>] ? flush_kthread_worker+0xa0/0xa0
[ 2297.712790] [<ffffffff81607d20>] ? gs_change+0x13/0x13
[ 2297.712793] Code: Bad RIP value.
[ 2297.712800] RIP [< (null)>] (null)
[ 2297.712805] RSP <ffff880165f5f9a8>
[ 2297.712807] CR2: 0000000000000000
[ 2297.732070] ---[ end trace fab2245623e88778 ]---
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/854257
Title:
device-mapper oops during failover, all I/O hangs
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