Recent failure is a bit different from others. In /var/log/messages in previous cases all errors were related to qemu process:

<6>Jan 16 01:13:32 node-7 kernel: [7064341.531377] qemu-system-x86 D ffff8827df833180     0 46940      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531554]  ffff880021f0fa88 0000000000000082 ffff88139c8b3000 ffff880021f0ffd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531736]  0000000000013180 0000000000013180 ffff88139c8b3000 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531742]  0000000000000000 ffff88132b196180 0000000000000000 ffff88139c8b3000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531749] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531760]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531767]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531772]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531775]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531778]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531782]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531785]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531790]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531796]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531800]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531804]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531811]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531816]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531819]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.531824]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Jan 16 01:13:32 node-7 kernel: [7064341.558032] qemu-system-x86 D ffff8827df833180     0 26526      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558036]  ffff88356cf77a88 0000000000000082 ffff8813985f4800 ffff88356cf77fd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558044]  0000000000013180 0000000000013180 ffff8813985f4800 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558050]  0000000000000000 ffff88132b192300 0000000000000000 ffff8813985f4800
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558056] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558062]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558066]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558071]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558074]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558078]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558081]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558085]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558088]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558092]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558096]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558099]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558104]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558108]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558112]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.558116]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Jan 16 01:13:32 node-7 kernel: [7064341.591466] qemu-system-x86 D ffff8827df833180     0 28329      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591471]  ffff880042d97a88 0000000000000082 ffff881345c96000 ffff880042d97fd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591478]  0000000000013180 0000000000013180 ffff881345c96000 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591484]  0000000000000000 ffff88132b195000 0000000000000000 ffff881345c96000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591491] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591504]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591508]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591513]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591517]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591520]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591526]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591529]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591533]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591537]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591541]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591544]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591549]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591552]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591556]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.591559]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Jan 16 01:13:32 node-7 kernel: [7064341.632384] qemu-system-x86 D ffff8827df833180     0 52940      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632389]  ffff8800540d5a88 0000000000000082 ffff8811cb000000 ffff8800540d5fd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632397]  0000000000013180 0000000000013180 ffff8811cb000000 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632403]  0000000000000000 ffff88132b195a00 0000000000000000 ffff8811cb000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632409] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632415]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632429]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632433]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632437]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632440]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632443]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632446]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632450]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632463]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632466]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632470]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632474]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632478]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632482]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.632485]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Jan 16 01:13:32 node-7 kernel: [7064341.679553] qemu-system-x86 D ffff8827df833180     0 66936      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679557]  ffff88006c8cba88 0000000000000082 ffff880064979800 ffff88006c8cbfd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679565]  0000000000013180 0000000000013180 ffff880064979800 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679572]  0000000000000000 ffff88132b192d00 0000000000000000 ffff880064979800
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679578] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679585]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679590]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679595]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679599]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679602]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679606]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679609]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679613]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679617]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679620]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679624]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679629]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679633]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679636]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.679640]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Jan 16 01:13:32 node-7 kernel: [7064341.731909] qemu-system-x86 D ffff8827df833180     0 15165      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731914]  ffff880048e73a88 0000000000000082 ffff880b80123000 ffff880048e73fd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731927]  0000000000013180 0000000000013180 ffff880b80123000 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731933]  0000000000000000 ffff88132b197580 0000000000000000 ffff880b80123000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731939] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731946]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731951]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731956]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731960]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731963]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731967]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731970]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731974]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731978]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731981]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731985]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731990]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731993]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.731998]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.732001]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Jan 16 01:13:32 node-7 kernel: [7064341.787377] qemu-system-x86 D ffff8827df833180     0 19831      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787382]  ffff880038083a88 0000000000000082 ffff88139b51c800 ffff880038083fd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787389]  0000000000013180 0000000000013180 ffff88139b51c800 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787395]  0000000000000000 ffff88132b193480 0000000000000000 ffff88139b51c800
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787402] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787409]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787415]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787420]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787431]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787434]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787438]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787441]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787446]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787450]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787454]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787457]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787463]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787467]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787471]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.787475]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Jan 16 01:13:32 node-7 kernel: [7064341.842858] qemu-system-x86 D ffff8827df833180     0 26367      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842862]  ffff8800523c3a88 0000000000000082 ffff88001c2b6000 ffff8800523c3fd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842870]  0000000000013180 0000000000013180 ffff88001c2b6000 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842876]  0000000000000000 ffff88132b192080 0000000000000000 ffff88001c2b6000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842882] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842889]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842894]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842899]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842910]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842913]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842917]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842920]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842924]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842928]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842932]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842935]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842941]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842945]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842949]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.842953]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Jan 16 01:13:32 node-7 kernel: [7064341.896993] qemu-system-x86 D ffff8827df833180     0 33540      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.896998]  ffff880022239a88 0000000000000082 ffff88093f9c4800 ffff880022239fd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897014]  0000000000013180 0000000000013180 ffff88093f9c4800 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897023]  0000000000000000 ffff88132b194380 0000000000000000 ffff88093f9c4800
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897035] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897042]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897047]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897052]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897056]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897059]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897063]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897066]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897073]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897077]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897081]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897084]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897089]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897093]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897097]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.897101]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Jan 16 01:13:32 node-7 kernel: [7064341.951109] qemu-system-x86 D ffff8827df833180     0 11121      1 0x00000000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951114]  ffff88006fc7da88 0000000000000082 ffff8813985f3000 ffff88006fc7dfd8
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951121]  0000000000013180 0000000000013180 ffff8813985f3000 ffff8827df833a18
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951127]  0000000000000000 ffff88132b193200 0000000000000000 ffff8813985f3000
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951134] Call Trace:
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951140]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951145]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951149]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951153]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951156]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951159]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951162]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951166]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951170]  [<ffffffff8106b882>] ? current_fs_time+0x12/0x60
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951174]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951177]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951182]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951185]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951189]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Jan 16 01:13:32 node-7 kernel: [7064341.951193]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f

In recent failure, vgs and blkid precesses are also present:
<6>Feb 23 18:43:16 node-10 kernel: [9726568.198062] qemu-system-x86 D ffff8827df833180     0 32990      1 0x00000000
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198089]  0000000000000000 ffff881363955000 0000000000000000 ffff881396a51800
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198096] Call Trace:
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198105]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198111]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198116]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198120]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198124]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198128]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198131]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198136]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198139]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198143]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198149]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198154]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198158]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198162]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198070]  ffff880071569a88 0000000000000082 ffff881396a51800 ffff880071569fd8
<4>Feb 23 18:43:16 node-10 kernel: [9726568.198083]  0000000000013180 0000000000013180 ffff881396a51800 ffff8827df833a18
<6>Feb 23 18:43:16 node-10 kernel: [9726568.218557] qemu-system-x86 D ffff8827df833180     0 38844      1 0x00000000
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218573]  ffff880056dd1ad8 0000000000000082 ffff880033bd6000 ffff880056dd1fd8
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218580]  0000000000013180 0000000000013180 ffff880033bd6000 ffff8827df833a18
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218586]  0000000000000000 ffff881363956180 0000000000000000 ffff880033bd6000
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218592] Call Trace:
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218597]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218601]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218605]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218608]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218611]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218614]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218617]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218621]  [<ffffffff811520ab>] generic_file_aio_read+0x69b/0x700
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218626]  [<ffffffff8108e720>] ? hrtimer_get_res+0x50/0x50
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218630]  [<ffffffff811f7cfb>] blkdev_aio_read+0x4b/0x70
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218634]  [<ffffffff811bdc0a>] do_sync_read+0x5a/0x90
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218637]  [<ffffffff811be2a5>] vfs_read+0x95/0x160
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218641]  [<ffffffff811bef22>] SyS_pread64+0x72/0xb0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.218644]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Feb 23 18:43:16 node-10 kernel: [9726568.247958] qemu-system-x86 D ffff8827df833180     0 48268      1 0x00000000
<4>Feb 23 18:43:16 node-10 kernel: [9726568.247962]  ffff88002fca59d0 0000000000000082 ffff8813993f9800 ffff88002fca5fd8
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248175]  0000000000013180 0000000000013180 ffff8813993f9800 ffff8827df833a18
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248181]  0000000000000000 ffff881363954d80 0000000000000000 ffff8813993f9800
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248187] Call Trace:
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248191]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248195]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248199]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248203]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248206]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248209]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248212]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248216]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248219]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248222]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248226]  [<ffffffff811bdd1c>] do_sync_readv_writev+0x4c/0x80
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248230]  [<ffffffff811bf1e0>] do_readv_writev+0xb0/0x220
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248235]  [<ffffffff810db67e>] ? do_futex+0xde/0x760
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248239]  [<ffffffff811bf3d0>] vfs_writev+0x30/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248242]  [<ffffffff811bf6f2>] SyS_pwritev+0xa2/0xd0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.248246]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Feb 23 18:43:16 node-10 kernel: [9726568.284603] qemu-system-x86 D ffff8827df833180     0 22338      1 0x00000000
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284607]  ffff880049a65d80 0000000000000082 ffff88003ab58000 ffff880049a65fd8
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284626]  0000000000013180 0000000000013180 ffff88003ab58000 ffff880049a65ea8
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284632]  ffff880049a65eb0 7fffffffffffffff ffff88003ab58000 00007f2b6bbd7700
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284638] Call Trace:
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284642]  [<ffffffff81728389>] schedule+0x29/0x70
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284646]  [<ffffffff817275d9>] schedule_timeout+0x239/0x2d0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284658]  [<ffffffff81339b43>] ? __blk_run_queue+0x33/0x40
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284661]  [<ffffffff8133d8b3>] ? blk_queue_bio+0x273/0x360
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284665]  [<ffffffff81728ea6>] wait_for_completion+0xa6/0x160
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284671]  [<ffffffff8109ac90>] ? wake_up_state+0x20/0x20
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284675]  [<ffffffff811f4bee>] submit_bio_wait+0x5e/0x70
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284679]  [<ffffffff8133f5ca>] blkdev_issue_flush+0x5a/0x90
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284682]  [<ffffffff811f7425>] blkdev_fsync+0x35/0x50
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284687]  [<ffffffff811ee551>] do_fsync+0x51/0x80
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284691]  [<ffffffff811ee803>] SyS_fdatasync+0x13/0x20
<4>Feb 23 18:43:16 node-10 kernel: [9726568.284694]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Feb 23 18:43:16 node-10 kernel: [9726568.319481] vgs             D ffff884fdf253180     0 73235  73234 0x00000000
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319496]  ffff88005d37dae0 0000000000000082 ffff88007135e000 ffff88005d37dfd8
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319505]  0000000000013180 0000000000013180 ffff88007135e000 ffff884fdf253a18
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319510]  0000000000000000 ffff883b9a4e9b80 0000000000000000 ffff88007135e000
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319520] Call Trace:
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319525]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319528]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319534]  [<ffffffff8116ecaf>] ? bdi_lock_two+0x2f/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319538]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319541]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319544]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319547]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319550]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319553]  [<ffffffff811520ab>] generic_file_aio_read+0x69b/0x700
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319575]  [<ffffffff811ce322>] ? final_putname+0x22/0x50
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319586]  [<ffffffff810f44d2>] ? from_kgid_munged+0x12/0x20
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319589]  [<ffffffff811f7cfb>] blkdev_aio_read+0x4b/0x70
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319592]  [<ffffffff811bdc0a>] do_sync_read+0x5a/0x90
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319596]  [<ffffffff811be2a5>] vfs_read+0x95/0x160
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319599]  [<ffffffff811bedb9>] SyS_read+0x49/0xa0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.319603]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Feb 23 18:43:16 node-10 kernel: [9726568.358860] blkid           D ffff884fdf013180     0 73404      1 0x00000000
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358864]  ffff8800631e5960 0000000000000082 ffff883b9c1fc800 ffff8800631e5fd8
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358871]  0000000000013180 0000000000013180 ffff883b9c1fc800 ffff8800631e5aa0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358877]  ffff8800631e5aa8 7fffffffffffffff ffff883b9c1fc800 ffff883b9c1fc800
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358883] Call Trace:
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358888]  [<ffffffff81728389>] schedule+0x29/0x70
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358891]  [<ffffffff817275d9>] schedule_timeout+0x239/0x2d0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358895]  [<ffffffff810985ed>] ? ttwu_do_activate.constprop.74+0x5d/0x70
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358899]  [<ffffffff8109ab6a>] ? try_to_wake_up+0x1fa/0x2c0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358903]  [<ffffffff8137649a>] ? sg_init_table+0x1a/0x40
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358906]  [<ffffffff81728ea6>] wait_for_completion+0xa6/0x160
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358910]  [<ffffffff8109ac90>] ? wake_up_state+0x20/0x20
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358914]  [<ffffffff81084dbd>] flush_work+0xed/0x1b0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358918]  [<ffffffff81081060>] ? wake_up_worker+0x30/0x30
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358921]  [<ffffffff81084f82>] __cancel_work_timer+0x92/0x1a0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358926]  [<ffffffff8149c972>] ? kobj_lookup+0x112/0x170
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358931]  [<ffffffff81348400>] ? disk_map_sector_rcu+0x80/0x80
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358935]  [<ffffffff810850c3>] cancel_delayed_work_sync+0x13/0x20
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358938]  [<ffffffff8134a2f0>] disk_block_events+0x80/0x90
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358941]  [<ffffffff811f898b>] __blkdev_get+0x5b/0x4c0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358944]  [<ffffffff811f8fb5>] blkdev_get+0x1c5/0x340
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358947]  [<ffffffff811f91db>] blkdev_open+0x5b/0x80
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358951]  [<ffffffff811bb8f3>] do_dentry_open+0x233/0x2e0
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358954]  [<ffffffff811f9180>] ? blkdev_get_by_dev+0x50/0x50
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358957]  [<ffffffff811bbc29>] vfs_open+0x49/0x50
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358960]  [<ffffffff811ccfd4>] do_last+0x564/0x1240
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358963]  [<ffffffff811caa91>] ? link_path_walk+0x71/0x880
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358968]  [<ffffffff8131618b>] ? apparmor_file_alloc_security+0x5b/0x180
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358972]  [<ffffffff811cdd6b>] path_openat+0xbb/0x650
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358975]  [<ffffffff811ce322>] ? final_putname+0x22/0x50
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358978]  [<ffffffff811ce529>] ? putname+0x29/0x40
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358981]  [<ffffffff811cf07f>] ? user_path_at_empty+0x5f/0x90
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358985]  [<ffffffff811cf16a>] do_filp_open+0x3a/0x90
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358988]  [<ffffffff811dbfe7>] ? __alloc_fd+0xa7/0x130
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358992]  [<ffffffff811bd749>] do_sys_open+0x129/0x280
<4>Feb 23 18:43:16 node-10 kernel: [9726568.358995]  [<ffffffff811bd8be>] SyS_open+0x1e/0x20
<4>Feb 23 18:43:16 node-10 kernel: [9726568.359009]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Feb 23 18:45:16 node-10 kernel: [9726688.484144] qemu-system-x86 D ffff8827df833180     0 32990      1 0x00000000
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484149]  ffff880071569a88 0000000000000082 ffff881396a51800 ffff880071569fd8
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484159]  0000000000013180 0000000000013180 ffff881396a51800 ffff8827df833a18
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484166]  0000000000000000 ffff881363955000 0000000000000000 ffff881396a51800
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484172] Call Trace:
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484181]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484188]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484192]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484197]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484200]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484204]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484207]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484211]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484215]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484219]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484225]  [<ffffffff811bdc9a>] do_sync_write+0x5a/0x90
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484229]  [<ffffffff811be424>] vfs_write+0xb4/0x1f0
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484233]  [<ffffffff811befd2>] SyS_pwrite64+0x72/0xb0
<4>Feb 23 18:45:16 node-10 kernel: [9726688.484237]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Feb 23 18:45:16 node-10 kernel: [9726688.536407] qemu-system-x86 D ffff8827df833180     0 38844      1 0x00000000
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536411]  ffff880056dd1ad8 0000000000000082 ffff880033bd6000 ffff880056dd1fd8
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536419]  0000000000013180 0000000000013180 ffff880033bd6000 ffff8827df833a18
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536428]  0000000000000000 ffff881363956180 0000000000000000 ffff880033bd6000
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536434] Call Trace:
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536440]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536451]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536456]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536460]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536468]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536473]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536476]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536479]  [<ffffffff811520ab>] generic_file_aio_read+0x69b/0x700
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536486]  [<ffffffff8108e720>] ? hrtimer_get_res+0x50/0x50
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536489]  [<ffffffff811f7cfb>] blkdev_aio_read+0x4b/0x70
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536493]  [<ffffffff811bdc0a>] do_sync_read+0x5a/0x90
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536497]  [<ffffffff811be2a5>] vfs_read+0x95/0x160
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536501]  [<ffffffff811bef22>] SyS_pread64+0x72/0xb0
<4>Feb 23 18:45:16 node-10 kernel: [9726688.536505]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589160]  0000000000000000 ffff881363954d80 0000000000000000 ffff8813993f9800
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589167] Call Trace:
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589172]  [<ffffffff817286ad>] io_schedule+0x9d/0x140
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589176]  [<ffffffff811fc314>] do_blockdev_direct_IO+0x1ce4/0x2910
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589181]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589184]  [<ffffffff811fcf95>] __blockdev_direct_IO+0x55/0x60
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589187]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589190]  [<ffffffff811f7876>] blkdev_direct_IO+0x56/0x60
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589193]  [<ffffffff811f7180>] ? I_BDEV+0x10/0x10
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589197]  [<ffffffff81150cd1>] generic_file_direct_write+0xc1/0x180
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589200]  [<ffffffff81151095>] __generic_file_aio_write+0x305/0x3d0
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589204]  [<ffffffff811f8156>] blkdev_aio_write+0x46/0x90
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589209]  [<ffffffff811bdd1c>] do_sync_readv_writev+0x4c/0x80
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589212]  [<ffffffff811bf1e0>] do_readv_writev+0xb0/0x220
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589217]  [<ffffffff810db67e>] ? do_futex+0xde/0x760
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589221]  [<ffffffff811bf3d0>] vfs_writev+0x30/0x60
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589225]  [<ffffffff811bf6f2>] SyS_pwritev+0xa2/0xd0
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589229]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f
<6>Feb 23 18:45:16 node-10 kernel: [9726688.589143] qemu-system-x86 D ffff8827df833180     0 48268      1 0x00000000
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589147]  ffff88002fca59d0 0000000000000082 ffff8813993f9800 ffff88002fca5fd8
<4>Feb 23 18:45:16 node-10 kernel: [9726688.589154]  0000000000013180 0000000000013180 ffff8813993f9800 ffff8827df833a18
<6>Feb 23 18:45:16 node-10 kernel: [9726688.642026] qemu-system-x86 D ffff8827df833180     0 22338      1 0x00000000
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642030]  ffff880049a65d80 0000000000000082 ffff88003ab58000 ffff880049a65fd8
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642037]  0000000000013180 0000000000013180 ffff88003ab58000 ffff880049a65ea8
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642043]  ffff880049a65eb0 7fffffffffffffff ffff88003ab58000 00007f2b6bbd7700
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642049] Call Trace:
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642055]  [<ffffffff81728389>] schedule+0x29/0x70
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642058]  [<ffffffff817275d9>] schedule_timeout+0x239/0x2d0
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642064]  [<ffffffff81339b43>] ? __blk_run_queue+0x33/0x40
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642067]  [<ffffffff8133d8b3>] ? blk_queue_bio+0x273/0x360
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642071]  [<ffffffff81728ea6>] wait_for_completion+0xa6/0x160
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642076]  [<ffffffff8109ac90>] ? wake_up_state+0x20/0x20
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642080]  [<ffffffff811f4bee>] submit_bio_wait+0x5e/0x70
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642083]  [<ffffffff8133f5ca>] blkdev_issue_flush+0x5a/0x90
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642087]  [<ffffffff811f7425>] blkdev_fsync+0x35/0x50
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642092]  [<ffffffff811ee551>] do_fsync+0x51/0x80
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642095]  [<ffffffff811ee803>] SyS_fdatasync+0x13/0x20
<4>Feb 23 18:45:16 node-10 kernel: [9726688.642098]  [<ffffffff81734b5d>] system_call_fastpath+0x1a/0x1f