Re: v3.15 dm-mpath regression: cable pull test causes I/O hang

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On 07/04/14 05:10, Junichi Nomura wrote:
> could you collect output of 'dmsetup table' on the test machine?
> My particular interest is whether pg_init is involved or not
> since Hannes's patch made major surgery on pg_init processing.
> 
> Also, output of the followings while the problem is happening might help:
>   dmsetup status
>   dmsetup info -c
>   cat /proc/diskstat
>   multipathd -k"show paths"
>   multipathd -k"show maps status"
>   multipathd -k"show maps stats"

Hello Junichi,

Thanks for looking into this issue. I have attached the requested
information to this e-mail for a test run with kernel 3.16-rc4 at the
initiator side.

Bart.
# dmsetup table
26133373139386639: 0 5368709120 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 65:16 1000 1 65:192 1000 1 
26230643330303865: 0 5368709120 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 65:48 1000 1 65:208 1000 1 
23834333461383137: 0 5368709120 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:208 1000 1 65:128 1000 1 
26361626563396362: 0 5368709120 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 65:80 1000 1 65:224 1000 1 
26363633765623538: 0 256000 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:32 1000 1 8:128 1000 1 
23832346438613834: 0 256000 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:96 1000 1 65:0 1000 1 
26638323034336331: 0 256000 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:80 1000 1 8:224 1000 1 
23937393633303630: 0 5368709120 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:240 1000 1 65:160 1000 1 
23931656631326633: 0 256000 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:112 1000 1 65:32 1000 1 
26665353936313532: 0 5368709120 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 65:176 1000 1 66:16 1000 1 
26135303862613661: 0 256000 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:144 1000 1 65:64 1000 1 
26439316335316263: 0 5368709120 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 65:112 1000 1 65:240 1000 1 
26564666266393235: 0 5368709120 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 65:144 1000 1 66:0 1000 1 
26562383264626236: 0 256000 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:64 1000 1 8:192 1000 1 
26236616132323164: 0 256000 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:176 1000 1 65:96 1000 1 
26466363537333266: 0 256000 multipath 3 queue_if_no_path pg_init_retries 50 0 1 1 service-time 0 2 2 8:48 1000 1 8:160 1000 1 
# dmsetup status
26133373139386639: 0 5368709120 multipath 2 0 0 0 1 1 A 0 2 2 65:16 A 0 0 1 65:192 A 0 0 1 
26230643330303865: 0 5368709120 multipath 2 0 0 0 1 1 A 0 2 2 65:48 A 0 0 1 65:208 A 0 0 1 
23834333461383137: 0 5368709120 multipath 2 1 0 0 1 1 E 0 2 2 8:208 A 0 0 1 65:128 A 0 0 1 
26361626563396362: 0 5368709120 multipath 2 1 0 0 1 1 E 0 2 2 65:80 A 0 0 1 65:224 A 0 0 1 
26363633765623538: 0 256000 multipath 2 0 0 0 1 1 A 0 2 2 8:32 A 0 0 1 8:128 A 0 0 1 
23832346438613834: 0 256000 multipath 2 1 0 0 1 1 E 0 2 2 8:96 A 0 0 1 65:0 A 0 0 1 
26638323034336331: 0 256000 multipath 2 1 0 0 1 1 E 0 2 2 8:80 A 0 0 1 8:224 A 0 0 1 
23937393633303630: 0 5368709120 multipath 2 0 0 0 1 1 A 0 2 2 8:240 A 0 0 1 65:160 A 0 0 1 
23931656631326633: 0 256000 multipath 2 1 0 0 1 1 E 0 2 2 8:112 A 0 0 1 65:32 A 0 0 1 
26665353936313532: 0 5368709120 multipath 2 0 0 0 1 1 A 0 2 2 65:176 A 0 0 1 66:16 A 0 0 1 
26135303862613661: 0 256000 multipath 2 0 0 0 1 1 A 0 2 2 8:144 A 0 0 1 65:64 A 0 0 1 
26439316335316263: 0 5368709120 multipath 2 0 0 0 1 1 A 0 2 2 65:112 A 0 0 1 65:240 A 0 0 1 
26564666266393235: 0 5368709120 multipath 2 0 0 0 1 1 A 0 2 2 65:144 A 0 0 1 66:0 A 0 0 1 
26562383264626236: 0 256000 multipath 2 1 0 0 1 1 E 0 2 2 8:64 A 0 0 1 8:192 A 0 0 1 
26236616132323164: 0 256000 multipath 2 0 0 0 1 1 A 0 2 2 8:176 A 0 0 1 65:96 A 0 0 1 
26466363537333266: 0 256000 multipath 2 1 0 0 1 1 E 0 2 2 8:48 A 0 0 1 8:160 A 0 0 1
# dmsetup info -c
Name              Maj Min Stat Open Targ Event  UUID                            
26133373139386639 253  10 L--w    0    1      0 mpath-26133373139386639         
26230643330303865 253  11 L--w    0    1      0 mpath-26230643330303865         
23834333461383137 253   9 L--w    1    1      0 mpath-23834333461383137         
26361626563396362 253  13 L--w    1    1      0 mpath-26361626563396362         
26363633765623538 253   0 L--w    1    1      5 mpath-26363633765623538         
23832346438613834 253   4 L--w    1    1      0 mpath-23832346438613834         
26638323034336331 253   3 L--w    1    1      0 mpath-26638323034336331         
23937393633303630 253   8 L--w    0    1      0 mpath-23937393633303630         
23931656631326633 253   5 L--w    1    1      0 mpath-23931656631326633         
26665353936313532 253  15 L--w    0    1      0 mpath-26665353936313532         
26135303862613661 253   6 L--w    0    1      0 mpath-26135303862613661         
26439316335316263 253  12 L--w    0    1      0 mpath-26439316335316263         
26564666266393235 253  14 L--w    0    1      0 mpath-26564666266393235         
26562383264626236 253   2 L--w    1    1      0 mpath-26562383264626236         
26236616132323164 253   7 L--w    0    1      0 mpath-26236616132323164         
26466363537333266 253   1 L--w    1    1      0 mpath-26466363537333266 
# cat /proc/diskstats
   8       0 sda 63494 687 2082482 45080 11530 6225 362768 690500 0 23530 734810
   8       1 sda1 170 0 1360 190 0 0 0 0 0 190 190
   8       2 sda2 63143 687 2079674 44620 11509 6225 362768 690490 0 23500 734330
   8      16 sdb 374 6 3040 460 0 0 0 0 0 460 460
   8      17 sdb1 180 0 1440 190 0 0 0 0 0 190 190
  11       0 sr0 0 0 0 0 0 0 0 0 0 0 0
 253       0 dm-0 283565 1406 2268002 22758620 295490 134 2560844 532030 0 671930 23290480
   8      32 sdc 1489 0 11912 30130 1168 0 9320 1020 0 1640 31150
   8      48 sdd 362 0 2896 1310 0 0 0 0 0 1310 1310
   8      64 sde 347 0 2776 1180 0 0 0 0 0 1170 1180
   8      80 sdf 346 0 2768 910 0 0 0 0 0 900 910
   8      96 sdg 389 0 3112 1020 0 0 0 0 0 1020 1020
   8     112 sdh 417 0 3336 1080 0 0 0 0 0 1070 1080
   8     128 sdi 234 0 1872 450 1132 0 9050 1590 0 2030 2040
   8     144 sdj 422 0 3400 1050 0 0 0 0 0 1040 1050
   8     160 sdk 234 0 1872 520 0 0 0 0 0 520 520
   8     176 sdl 421 0 3392 1030 0 0 0 0 0 1020 1030
   8     192 sdm 234 0 1872 510 0 0 0 0 0 510 510
   8     208 sdn 369 0 2952 880 0 0 0 0 0 880 880
   8     224 sdo 234 0 1872 500 0 0 0 0 0 500 500
 253       1 dm-1 127 0 1016 1070 0 0 0 0 1 278360 278820
   8     240 sdp 425 0 3424 890 0 0 0 0 0 880 890
  65       0 sdq 234 0 1872 500 0 0 0 0 0 500 500
  65      16 sdr 424 0 3416 910 0 0 0 0 0 910 910
 253       2 dm-2 112 0 896 1050 0 0 0 0 1 278240 278710
  65      32 sds 233 0 1864 590 0 0 0 0 0 590 590
  65      48 sdt 426 0 3432 860 0 0 0 0 0 850 860
  65      64 sdu 421 0 3392 830 0 0 0 0 0 830 830
 253       3 dm-3 111 0 888 1120 0 0 0 0 1 278170 278700
  65      96 sdw 422 0 3400 910 0 0 0 0 0 910 910
  65      80 sdv 404 0 3232 900 0 0 0 0 0 900 900
 253       4 dm-4 154 0 1232 1310 0 0 0 0 1 278110 278720
  65     112 sdx 425 0 3424 960 0 0 0 0 0 960 960
  65     128 sdy 235 0 1880 570 0 0 0 0 0 570 570
 253       5 dm-5 183 0 1464 1410 0 0 0 0 1 278050 278700
  65     144 sdz 425 0 3424 820 0 0 0 0 0 820 820
  65     160 sdaa 425 0 3424 830 0 0 0 0 0 830 830
 253       6 dm-6 374 6 3040 1750 0 0 0 0 0 940 1750
  65     176 sdab 426 0 3432 820 0 0 0 0 0 820 820
  65     192 sdac 428 0 3448 830 0 0 0 0 0 830 830
  65     208 sdad 425 0 3424 740 0 0 0 0 0 740 740
 253       7 dm-7 374 6 3040 1620 0 0 0 0 0 880 1620
  65     224 sdae 236 0 1888 500 0 0 0 0 0 500 500
  65     240 sdaf 427 0 3440 640 0 0 0 0 0 640 640
  66       0 sdag 427 0 3440 530 0 0 0 0 0 530 530
  66      16 sdah 426 0 3432 540 0 0 0 0 0 540 540
 253       8 dm-8 378 6 3072 1190 0 0 0 0 0 640 1190
 253       9 dm-9 134 0 1072 520 0 0 0 0 1 277420 277640
 253      10 dm-10 378 6 3072 1180 0 0 0 0 0 660 1180
 253      11 dm-11 378 6 3072 1000 0 0 0 0 0 530 1000
 253      12 dm-12 378 6 3072 990 0 0 0 0 0 560 990
 253      13 dm-13 168 0 1344 500 0 0 0 0 1 276920 277150
 253      14 dm-14 378 6 3072 910 0 0 0 0 0 480 910
 253      15 dm-15 378 6 3072 950 0 0 0 0 0 500 950
# multipathd -k"show paths"
hcil      dev  dev_t  pri dm_st  chk_st dev_st  next_check    
15:0:0:0  sdc  8:32   1   active ready  running XX........ 1/4
15:0:0:1  sdd  8:48   1   active ready  running XX........ 1/4
15:0:0:2  sde  8:64   1   active ready  running XX........ 1/4
15:0:0:3  sdf  8:80   1   active ready  running XX........ 1/4
15:0:0:4  sdg  8:96   1   active ready  running XX........ 1/4
15:0:0:5  sdh  8:112  1   active ready  running XX........ 1/4
15:0:0:6  sdj  8:144  1   active ready  running XX........ 1/4
16:0:0:0  sdi  8:128  1   active ready  running XX........ 1/4
15:0:0:7  sdl  8:176  1   active ready  running XX........ 1/4
16:0:0:1  sdk  8:160  1   active ready  running XX........ 1/4
16:0:0:2  sdm  8:192  1   active ready  running XX........ 1/4
16:0:0:3  sdo  8:224  1   active ready  running XX........ 1/4
15:0:0:11 sdp  8:240  1   active ready  running XX........ 1/4
15:0:0:10 sdn  8:208  1   active ready  running XX........ 1/4
16:0:0:4  sdq  65:0   1   active ready  running XX........ 1/4
15:0:0:12 sdr  65:16  1   active ready  running XX........ 1/4
16:0:0:5  sds  65:32  1   active ready  running XX........ 1/4
16:0:0:6  sdu  65:64  1   active ready  running XX........ 1/4
15:0:0:13 sdt  65:48  1   active ready  running XX........ 1/4
16:0:0:10 sdy  65:128 1   active ready  running XX........ 1/4
16:0:0:7  sdw  65:96  1   active ready  running XX........ 1/4
15:0:0:15 sdx  65:112 1   active ready  running XX........ 1/4
15:0:0:14 sdv  65:80  1   active ready  running XX........ 1/4
15:0:0:16 sdz  65:144 1   active ready  running XX........ 1/4
15:0:0:17 sdab 65:176 1   active ready  running XX........ 1/4
16:0:0:12 sdac 65:192 1   active ready  running XX........ 1/4
16:0:0:11 sdaa 65:160 1   active ready  running XX........ 1/4
16:0:0:13 sdad 65:208 1   active ready  running XX........ 1/4
16:0:0:14 sdae 65:224 1   active ready  running XX........ 1/4
16:0:0:15 sdaf 65:240 1   active ready  running XX........ 1/4
16:0:0:17 sdah 66:16  1   active ready  running XX........ 1/4
16:0:0:16 sdag 66:0   1   active ready  running XX........ 1/4
# multipathd -k"show maps status"
name              failback queueing paths dm-st  write_prot
26363633765623538 -        on       2     active rw        
26466363537333266 -        on       2     active rw        
26562383264626236 -        on       2     active rw        
26638323034336331 -        on       2     active rw        
23832346438613834 -        on       2     active rw        
23931656631326633 -        on       2     active rw        
26135303862613661 -        on       2     active rw        
26236616132323164 -        on       2     active rw        
23937393633303630 -        on       2     active rw        
23834333461383137 -        on       2     active rw        
26133373139386639 -        on       2     active rw        
26230643330303865 -        on       2     active rw        
26439316335316263 -        on       2     active rw        
26361626563396362 -        on       2     active rw        
26564666266393235 -        on       2     active rw        
26665353936313532 -        on       2     active rw
# multipathd -k"show maps stats"
name              path_faults switch_grp map_loads total_q_time q_timeouts
26363633765623538 5           0          9         0            0         
26466363537333266 0           0          2         0            0         
26562383264626236 0           0          2         0            0         
26638323034336331 0           0          2         0            0         
23832346438613834 0           0          2         0            0         
23931656631326633 0           0          2         0            0         
26135303862613661 0           0          2         0            0         
26236616132323164 0           0          2         0            0         
23937393633303630 0           0          2         0            0         
23834333461383137 0           0          2         0            0         
26133373139386639 0           0          2         0            0         
26230643330303865 0           0          2         0            0         
26439316335316263 0           0          2         0            0         
26361626563396362 0           0          2         0            0         
26564666266393235 0           0          2         0            0         
26665353936313532 0           0          2         0            0         





SysRq : Show Blocked State
  task                        PC stack   pid father
systemd-udevd   D ffff88083b6f8000     0  8283    358 0x00000000
 ffff8807c69f3b30 0000000000000002 ffff88083b6f8000 ffff8807c69f3fd8
 00000000000131c0 00000000000131c0 ffffffff81a154c0 ffff8807d7578698
 ffff8807d75786a0 0000000000000246 ffff88083b6f8000 0000000000000000
Call Trace:
 [<ffffffff814bc3a3>] schedule_preempt_disabled+0x33/0x80
 [<ffffffff814bd3dc>] mutex_lock_nested+0x15c/0x3d0
 [<ffffffff811d4b56>] ? __blkdev_get+0x66/0x4c0
 [<ffffffff811d4b56>] __blkdev_get+0x66/0x4c0
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d5195>] blkdev_get+0x1e5/0x380
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d53db>] blkdev_open+0x5b/0x80
 [<ffffffff81195fc2>] do_dentry_open.isra.15+0x1e2/0x320
 [<ffffffff81196210>] finish_open+0x30/0x40
 [<ffffffff811a82cd>] do_last.isra.61+0xa3d/0x1150
 [<ffffffff811a4725>] ? path_init+0x5d5/0x750
 [<ffffffff810a6900>] ? trace_hardirqs_on_caller+0xc0/0x1c0
 [<ffffffff811a8a58>] ? path_openat+0x78/0x620
 [<ffffffff811a8a97>] path_openat+0xb7/0x620
 [<ffffffff811a967a>] do_filp_open+0x3a/0x90
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811b8a1c>] ? __alloc_fd+0xac/0x1b0
 [<ffffffff81197a5e>] do_sys_open+0x12e/0x210
 [<ffffffff8101209d>] ? syscall_trace_enter+0xfd/0x200
 [<ffffffff81197b5e>] SyS_open+0x1e/0x20
 [<ffffffff814c1ea2>] tracesys+0xd0/0xd5
systemd-udevd   D ffff88083b322230     0  8317    358 0x00000000
 ffff8807cfa27b30 0000000000000002 ffff88083b322230 ffff8807cfa27fd8
 00000000000131c0 00000000000131c0 ffff88083b490000 ffff88083ec1a098
 ffff88083ec1a0a0 0000000000000246 ffff88083b322230 0000000000000000
Call Trace:
 [<ffffffff814bc3a3>] schedule_preempt_disabled+0x33/0x80
 [<ffffffff814bd3dc>] mutex_lock_nested+0x15c/0x3d0
 [<ffffffff811d4b56>] ? __blkdev_get+0x66/0x4c0
 [<ffffffff811d4b56>] __blkdev_get+0x66/0x4c0
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d5195>] blkdev_get+0x1e5/0x380
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d53db>] blkdev_open+0x5b/0x80
 [<ffffffff81195fc2>] do_dentry_open.isra.15+0x1e2/0x320
 [<ffffffff81196210>] finish_open+0x30/0x40
 [<ffffffff811a82cd>] do_last.isra.61+0xa3d/0x1150
 [<ffffffff811a4725>] ? path_init+0x5d5/0x750
 [<ffffffff810a6900>] ? trace_hardirqs_on_caller+0xc0/0x1c0
 [<ffffffff811a8a58>] ? path_openat+0x78/0x620
 [<ffffffff811a8a97>] path_openat+0xb7/0x620
 [<ffffffff811a967a>] do_filp_open+0x3a/0x90
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811b8a1c>] ? __alloc_fd+0xac/0x1b0
 [<ffffffff81197a5e>] do_sys_open+0x12e/0x210
 [<ffffffff8101209d>] ? syscall_trace_enter+0xfd/0x200
 [<ffffffff81197b5e>] SyS_open+0x1e/0x20
 [<ffffffff814c1ea2>] tracesys+0xd0/0xd5
systemd-udevd   D ffff88083b00a230     0  8329    358 0x00000000
 ffff8807ee1b3b30 0000000000000002 ffff88083b00a230 ffff8807ee1b3fd8
 00000000000131c0 00000000000131c0 ffff88083baea230 ffff88083ec1b418
 ffff88083ec1b420 0000000000000246 ffff88083b00a230 0000000000000000
Call Trace:
 [<ffffffff814bc3a3>] schedule_preempt_disabled+0x33/0x80
 [<ffffffff814bd3dc>] mutex_lock_nested+0x15c/0x3d0
 [<ffffffff811d4b56>] ? __blkdev_get+0x66/0x4c0
 [<ffffffff811d4b56>] __blkdev_get+0x66/0x4c0
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d5195>] blkdev_get+0x1e5/0x380
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d53db>] blkdev_open+0x5b/0x80
 [<ffffffff81195fc2>] do_dentry_open.isra.15+0x1e2/0x320
 [<ffffffff81196210>] finish_open+0x30/0x40
 [<ffffffff811a82cd>] do_last.isra.61+0xa3d/0x1150
 [<ffffffff811a4725>] ? path_init+0x5d5/0x750
 [<ffffffff810a6900>] ? trace_hardirqs_on_caller+0xc0/0x1c0
 [<ffffffff811a8a58>] ? path_openat+0x78/0x620
 [<ffffffff811a8a97>] path_openat+0xb7/0x620
 [<ffffffff811a967a>] do_filp_open+0x3a/0x90
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811b8a1c>] ? __alloc_fd+0xac/0x1b0
 [<ffffffff81197a5e>] do_sys_open+0x12e/0x210
 [<ffffffff8101209d>] ? syscall_trace_enter+0xfd/0x200
 [<ffffffff81197b5e>] SyS_open+0x1e/0x20
 [<ffffffff814c1ea2>] tracesys+0xd0/0xd5
systemd-udevd   D ffff8807d1290000     0  8330    358 0x00000000
 ffff8807cee23b30 0000000000000002 ffff8807d1290000 ffff8807cee23fd8
 00000000000131c0 00000000000131c0 ffff88083b492230 ffff8807d77a6e98
 ffff8807d77a6ea0 0000000000000246 ffff8807d1290000 0000000000000000
Call Trace:
 [<ffffffff814bc3a3>] schedule_preempt_disabled+0x33/0x80
 [<ffffffff814bd3dc>] mutex_lock_nested+0x15c/0x3d0
 [<ffffffff811d4b56>] ? __blkdev_get+0x66/0x4c0
 [<ffffffff811d4b56>] __blkdev_get+0x66/0x4c0
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d5195>] blkdev_get+0x1e5/0x380
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d53db>] blkdev_open+0x5b/0x80
 [<ffffffff81195fc2>] do_dentry_open.isra.15+0x1e2/0x320
 [<ffffffff81196210>] finish_open+0x30/0x40
 [<ffffffff811a82cd>] do_last.isra.61+0xa3d/0x1150
 [<ffffffff811a4725>] ? path_init+0x5d5/0x750
 [<ffffffff810a6900>] ? trace_hardirqs_on_caller+0xc0/0x1c0
 [<ffffffff811a8a58>] ? path_openat+0x78/0x620
 [<ffffffff811a8a97>] path_openat+0xb7/0x620
 [<ffffffff811a967a>] do_filp_open+0x3a/0x90
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811b8a1c>] ? __alloc_fd+0xac/0x1b0
 [<ffffffff81197a5e>] do_sys_open+0x12e/0x210
 [<ffffffff8101209d>] ? syscall_trace_enter+0xfd/0x200
 [<ffffffff81197b5e>] SyS_open+0x1e/0x20
 [<ffffffff814c1ea2>] tracesys+0xd0/0xd5
systemd-udevd   D ffff8807d168c460     0  8334    358 0x00000000
 ffff8807d13bfb30 0000000000000002 ffff8807d168c460 ffff8807d13bffd8
 00000000000131c0 00000000000131c0 ffff88083b422230 ffff8807d77a5498
 ffff8807d77a54a0 0000000000000246 ffff8807d168c460 0000000000000000
Call Trace:
 [<ffffffff814bc3a3>] schedule_preempt_disabled+0x33/0x80
 [<ffffffff814bd3dc>] mutex_lock_nested+0x15c/0x3d0
 [<ffffffff811d4b56>] ? __blkdev_get+0x66/0x4c0
 [<ffffffff811d4b56>] __blkdev_get+0x66/0x4c0
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d5195>] blkdev_get+0x1e5/0x380
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d53db>] blkdev_open+0x5b/0x80
 [<ffffffff81195fc2>] do_dentry_open.isra.15+0x1e2/0x320
 [<ffffffff81196210>] finish_open+0x30/0x40
 [<ffffffff811a82cd>] do_last.isra.61+0xa3d/0x1150
 [<ffffffff811a4725>] ? path_init+0x5d5/0x750
 [<ffffffff810a6900>] ? trace_hardirqs_on_caller+0xc0/0x1c0
 [<ffffffff811a8a58>] ? path_openat+0x78/0x620
 [<ffffffff811a8a97>] path_openat+0xb7/0x620
 [<ffffffff811a967a>] do_filp_open+0x3a/0x90
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811b8a1c>] ? __alloc_fd+0xac/0x1b0
 [<ffffffff81197a5e>] do_sys_open+0x12e/0x210
 [<ffffffff8101209d>] ? syscall_trace_enter+0xfd/0x200
 [<ffffffff81197b5e>] SyS_open+0x1e/0x20
 [<ffffffff814c1ea2>] tracesys+0xd0/0xd5
systemd-udevd   D ffff8807d1688000     0  8335    358 0x00000000
 ffff8807cf5f3b30 0000000000000002 ffff8807d1688000 ffff8807cf5f3fd8
 00000000000131c0 00000000000131c0 ffff88083b494460 ffff88083ec1a718
 ffff88083ec1a720 0000000000000246 ffff8807d1688000 0000000000000000
Call Trace:
 [<ffffffff814bc3a3>] schedule_preempt_disabled+0x33/0x80
 [<ffffffff814bd3dc>] mutex_lock_nested+0x15c/0x3d0
 [<ffffffff811d4b56>] ? __blkdev_get+0x66/0x4c0
 [<ffffffff811d4b56>] __blkdev_get+0x66/0x4c0
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d5195>] blkdev_get+0x1e5/0x380
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d53db>] blkdev_open+0x5b/0x80
 [<ffffffff81195fc2>] do_dentry_open.isra.15+0x1e2/0x320
 [<ffffffff81196210>] finish_open+0x30/0x40
 [<ffffffff811a82cd>] do_last.isra.61+0xa3d/0x1150
 [<ffffffff811a4725>] ? path_init+0x5d5/0x750
 [<ffffffff810a6900>] ? trace_hardirqs_on_caller+0xc0/0x1c0
 [<ffffffff811a8a58>] ? path_openat+0x78/0x620
 [<ffffffff811a8a97>] path_openat+0xb7/0x620
 [<ffffffff811a967a>] do_filp_open+0x3a/0x90
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811b8a1c>] ? __alloc_fd+0xac/0x1b0
 [<ffffffff81197a5e>] do_sys_open+0x12e/0x210
 [<ffffffff8101209d>] ? syscall_trace_enter+0xfd/0x200
 [<ffffffff81197b5e>] SyS_open+0x1e/0x20
 [<ffffffff814c1ea2>] tracesys+0xd0/0xd5
systemd-udevd   D ffff88082df38000     0  8341    358 0x00000000
 ffff8807d1763b30 0000000000000002 ffff88082df38000 ffff8807d1763fd8
 00000000000131c0 00000000000131c0 ffff88083b422230 ffff8807d757e818
 ffff8807d757e820 0000000000000246 ffff88082df38000 0000000000000000
Call Trace:
 [<ffffffff814bc3a3>] schedule_preempt_disabled+0x33/0x80
 [<ffffffff814bd3dc>] mutex_lock_nested+0x15c/0x3d0
 [<ffffffff811d4b56>] ? __blkdev_get+0x66/0x4c0
 [<ffffffff811d4b56>] __blkdev_get+0x66/0x4c0
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d5195>] blkdev_get+0x1e5/0x380
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811d5380>] ? blkdev_get_by_dev+0x50/0x50
 [<ffffffff811d53db>] blkdev_open+0x5b/0x80
 [<ffffffff81195fc2>] do_dentry_open.isra.15+0x1e2/0x320
 [<ffffffff81196210>] finish_open+0x30/0x40
 [<ffffffff811a82cd>] do_last.isra.61+0xa3d/0x1150
 [<ffffffff811a4725>] ? path_init+0x5d5/0x750
 [<ffffffff810a6900>] ? trace_hardirqs_on_caller+0xc0/0x1c0
 [<ffffffff811a8a58>] ? path_openat+0x78/0x620
 [<ffffffff811a8a97>] path_openat+0xb7/0x620
 [<ffffffff811a967a>] do_filp_open+0x3a/0x90
 [<ffffffff814c1091>] ? _raw_spin_unlock+0x31/0x50
 [<ffffffff811b8a1c>] ? __alloc_fd+0xac/0x1b0
 [<ffffffff81197a5e>] do_sys_open+0x12e/0x210
 [<ffffffff8101209d>] ? syscall_trace_enter+0xfd/0x200
 [<ffffffff81197b5e>] SyS_open+0x1e/0x20
 [<ffffffff814c1ea2>] tracesys+0xd0/0xd5
blkid           D ffff8807d3110000     0  8422      1 0x00000006
 ffff8807d59879b8 0000000000000002 ffff8807d3110000 ffff8807d5987fd8
 00000000000131c0 00000000000131c0 ffff88083b4c4460 ffff88085fd33ad0
 ffff88085ff83038 ffff8807d5987a40 0000000000000002 ffffffff81135db0
Call Trace:
 [<ffffffff81135db0>] ? wait_on_page_read+0x60/0x60
 [<ffffffff814bc0ed>] io_schedule+0x9d/0x130
 [<ffffffff81135dbe>] sleep_on_page+0xe/0x20
 [<ffffffff814bc738>] __wait_on_bit_lock+0x48/0xb0
 [<ffffffff81135eca>] __lock_page+0x6a/0x70
 [<ffffffff8109c8e0>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff811474cf>] truncate_inode_pages_range+0x3ff/0x690
 [<ffffffff81147775>] truncate_inode_pages+0x15/0x20
 [<ffffffff811d3425>] kill_bdev+0x35/0x40
 [<ffffffff811d49a9>] __blkdev_put+0x69/0x1b0
 [<ffffffff811d5450>] blkdev_put+0x50/0x160
 [<ffffffff811d5615>] blkdev_close+0x25/0x30
 [<ffffffff8119a37a>] __fput+0xea/0x1f0
 [<ffffffff8119a4ce>] ____fput+0xe/0x10
 [<ffffffff81074ddc>] task_work_run+0xac/0xe0
 [<ffffffff8104ff67>] do_exit+0x2c7/0xc60
 [<ffffffff81064091>] ? get_signal_to_deliver+0xd1/0x940
 [<ffffffff814c118c>] ? _raw_spin_unlock_irq+0x2c/0x60
 [<ffffffff81051cac>] do_group_exit+0x4c/0xc0
 [<ffffffff810642a1>] get_signal_to_deliver+0x2e1/0x940
 [<ffffffff81002528>] do_signal+0x48/0x630
 [<ffffffff811d3f77>] ? blkdev_read_iter+0x37/0x40
 [<ffffffff8119809e>] ? new_sync_read+0x7e/0xb0
 [<ffffffff8127f0d7>] ? debug_smp_processor_id+0x17/0x20
 [<ffffffff810ba5d6>] ? rcu_eqs_exit_common.isra.43+0x26/0xe0
 [<ffffffff8113539a>] ? context_tracking_user_exit+0x5a/0x1a0
 [<ffffffff810a693d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
 [<ffffffff81002b81>] do_notify_resume+0x71/0xc0
 [<ffffffff814c1f98>] int_signal+0x12/0x17
blkid           D ffff8807d3632230     0  8458      1 0x00000006
 ffff8807d360f9b8 0000000000000002 ffff8807d3632230 ffff8807d360ffd8
 00000000000131c0 00000000000131c0 ffff88083b492230 ffff88085fc93ad0
 ffff88085ff7fa38 ffff8807d360fa40 0000000000000002 ffffffff81135db0
Call Trace:
 [<ffffffff81135db0>] ? wait_on_page_read+0x60/0x60
 [<ffffffff814bc0ed>] io_schedule+0x9d/0x130
 [<ffffffff81135dbe>] sleep_on_page+0xe/0x20
 [<ffffffff814bc738>] __wait_on_bit_lock+0x48/0xb0
 [<ffffffff81135eca>] __lock_page+0x6a/0x70
 [<ffffffff8109c8e0>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff811474cf>] truncate_inode_pages_range+0x3ff/0x690
 [<ffffffff81147775>] truncate_inode_pages+0x15/0x20
 [<ffffffff811d3425>] kill_bdev+0x35/0x40
 [<ffffffff811d49a9>] __blkdev_put+0x69/0x1b0
 [<ffffffff811d5450>] blkdev_put+0x50/0x160
 [<ffffffff811d5615>] blkdev_close+0x25/0x30
 [<ffffffff8119a37a>] __fput+0xea/0x1f0
 [<ffffffff8119a4ce>] ____fput+0xe/0x10
 [<ffffffff81074ddc>] task_work_run+0xac/0xe0
 [<ffffffff8104ff67>] do_exit+0x2c7/0xc60
 [<ffffffff81064091>] ? get_signal_to_deliver+0xd1/0x940
 [<ffffffff814c118c>] ? _raw_spin_unlock_irq+0x2c/0x60
 [<ffffffff81051cac>] do_group_exit+0x4c/0xc0
 [<ffffffff810642a1>] get_signal_to_deliver+0x2e1/0x940
 [<ffffffff81002528>] do_signal+0x48/0x630
 [<ffffffff811d3f77>] ? blkdev_read_iter+0x37/0x40
 [<ffffffff8119809e>] ? new_sync_read+0x7e/0xb0
 [<ffffffff8127f0d7>] ? debug_smp_processor_id+0x17/0x20
 [<ffffffff810ba5d6>] ? rcu_eqs_exit_common.isra.43+0x26/0xe0
 [<ffffffff8113539a>] ? context_tracking_user_exit+0x5a/0x1a0
 [<ffffffff810a693d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
 [<ffffffff81002b81>] do_notify_resume+0x71/0xc0
 [<ffffffff814c1f98>] int_signal+0x12/0x17
blkid           D ffff8807d4432230     0  8467      1 0x00000006
 ffff8807d4daf9b8 0000000000000002 ffff8807d4432230 ffff8807d4daffd8
 00000000000131c0 00000000000131c0 ffff88083b4c2230 ffff88085fd53ad0
 ffff88085ffa4338 ffff8807d4dafa40 0000000000000002 ffffffff81135db0
Call Trace:
 [<ffffffff81135db0>] ? wait_on_page_read+0x60/0x60
 [<ffffffff814bc0ed>] io_schedule+0x9d/0x130
 [<ffffffff81135dbe>] sleep_on_page+0xe/0x20
 [<ffffffff814bc738>] __wait_on_bit_lock+0x48/0xb0
 [<ffffffff81135eca>] __lock_page+0x6a/0x70
 [<ffffffff8109c8e0>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff811474cf>] truncate_inode_pages_range+0x3ff/0x690
 [<ffffffff81147775>] truncate_inode_pages+0x15/0x20
 [<ffffffff811d3425>] kill_bdev+0x35/0x40
 [<ffffffff811d49a9>] __blkdev_put+0x69/0x1b0
 [<ffffffff811d5450>] blkdev_put+0x50/0x160
 [<ffffffff811d5615>] blkdev_close+0x25/0x30
 [<ffffffff8119a37a>] __fput+0xea/0x1f0
 [<ffffffff8119a4ce>] ____fput+0xe/0x10
 [<ffffffff81074ddc>] task_work_run+0xac/0xe0
 [<ffffffff8104ff67>] do_exit+0x2c7/0xc60
 [<ffffffff81064091>] ? get_signal_to_deliver+0xd1/0x940
 [<ffffffff814c118c>] ? _raw_spin_unlock_irq+0x2c/0x60
 [<ffffffff81051cac>] do_group_exit+0x4c/0xc0
 [<ffffffff810642a1>] get_signal_to_deliver+0x2e1/0x940
 [<ffffffff81002528>] do_signal+0x48/0x630
 [<ffffffff811d3f77>] ? blkdev_read_iter+0x37/0x40
 [<ffffffff8119809e>] ? new_sync_read+0x7e/0xb0
 [<ffffffff8127f0d7>] ? debug_smp_processor_id+0x17/0x20
 [<ffffffff810ba5d6>] ? rcu_eqs_exit_common.isra.43+0x26/0xe0
 [<ffffffff8113539a>] ? context_tracking_user_exit+0x5a/0x1a0
 [<ffffffff810a693d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
 [<ffffffff81002b81>] do_notify_resume+0x71/0xc0
 [<ffffffff814c1f98>] int_signal+0x12/0x17
blkid           D ffff8807d275a230     0  8472      1 0x00000006
 ffff8807d27bb9b8 0000000000000002 ffff8807d275a230 ffff8807d27bbfd8
 00000000000131c0 00000000000131c0 ffff8807d1290000 ffff88085fc93ad0
 ffff88085ff87838 ffff8807d27bba40 0000000000000002 ffffffff81135db0
Call Trace:
 [<ffffffff81135db0>] ? wait_on_page_read+0x60/0x60
 [<ffffffff814bc0ed>] io_schedule+0x9d/0x130
 [<ffffffff81135dbe>] sleep_on_page+0xe/0x20
 [<ffffffff814bc738>] __wait_on_bit_lock+0x48/0xb0
 [<ffffffff81135eca>] __lock_page+0x6a/0x70
 [<ffffffff8109c8e0>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff811474cf>] truncate_inode_pages_range+0x3ff/0x690
 [<ffffffff81147775>] truncate_inode_pages+0x15/0x20
 [<ffffffff811d3425>] kill_bdev+0x35/0x40
 [<ffffffff811d49a9>] __blkdev_put+0x69/0x1b0
 [<ffffffff811d5450>] blkdev_put+0x50/0x160
 [<ffffffff811d5615>] blkdev_close+0x25/0x30
 [<ffffffff8119a37a>] __fput+0xea/0x1f0
 [<ffffffff8119a4ce>] ____fput+0xe/0x10
 [<ffffffff81074ddc>] task_work_run+0xac/0xe0
 [<ffffffff8104ff67>] do_exit+0x2c7/0xc60
 [<ffffffff81064091>] ? get_signal_to_deliver+0xd1/0x940
 [<ffffffff814c118c>] ? _raw_spin_unlock_irq+0x2c/0x60
 [<ffffffff81051cac>] do_group_exit+0x4c/0xc0
 [<ffffffff810642a1>] get_signal_to_deliver+0x2e1/0x940
 [<ffffffff81002528>] do_signal+0x48/0x630
 [<ffffffff811d3f77>] ? blkdev_read_iter+0x37/0x40
 [<ffffffff8119809e>] ? new_sync_read+0x7e/0xb0
 [<ffffffff8127f0d7>] ? debug_smp_processor_id+0x17/0x20
 [<ffffffff810ba5d6>] ? rcu_eqs_exit_common.isra.43+0x26/0xe0
 [<ffffffff8113539a>] ? context_tracking_user_exit+0x5a/0x1a0
 [<ffffffff810a693d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
 [<ffffffff81002b81>] do_notify_resume+0x71/0xc0
 [<ffffffff814c1f98>] int_signal+0x12/0x17
blkid           D ffff8807c6b10000     0  8482      1 0x00000006
 ffff8807d4dbf9b8 0000000000000002 ffff8807c6b10000 ffff8807d4dbffd8
 00000000000131c0 00000000000131c0 ffff88082df38000 ffff88085fd73ad0
 ffff88085ff74638 ffff8807d4dbfa40 0000000000000002 ffffffff81135db0
Call Trace:
 [<ffffffff81135db0>] ? wait_on_page_read+0x60/0x60
 [<ffffffff814bc0ed>] io_schedule+0x9d/0x130
 [<ffffffff81135dbe>] sleep_on_page+0xe/0x20
 [<ffffffff814bc738>] __wait_on_bit_lock+0x48/0xb0
 [<ffffffff81135eca>] __lock_page+0x6a/0x70
 [<ffffffff8109c8e0>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff811474cf>] truncate_inode_pages_range+0x3ff/0x690
 [<ffffffff81147775>] truncate_inode_pages+0x15/0x20
 [<ffffffff811d3425>] kill_bdev+0x35/0x40
 [<ffffffff811d49a9>] __blkdev_put+0x69/0x1b0
 [<ffffffff811d5450>] blkdev_put+0x50/0x160
 [<ffffffff811d5615>] blkdev_close+0x25/0x30
 [<ffffffff8119a37a>] __fput+0xea/0x1f0
 [<ffffffff8119a4ce>] ____fput+0xe/0x10
 [<ffffffff81074ddc>] task_work_run+0xac/0xe0
 [<ffffffff8104ff67>] do_exit+0x2c7/0xc60
 [<ffffffff81064091>] ? get_signal_to_deliver+0xd1/0x940
 [<ffffffff814c118c>] ? _raw_spin_unlock_irq+0x2c/0x60
 [<ffffffff81051cac>] do_group_exit+0x4c/0xc0
 [<ffffffff810642a1>] get_signal_to_deliver+0x2e1/0x940
 [<ffffffff81002528>] do_signal+0x48/0x630
 [<ffffffff811d3f77>] ? blkdev_read_iter+0x37/0x40
 [<ffffffff8119809e>] ? new_sync_read+0x7e/0xb0
 [<ffffffff8127f0d7>] ? debug_smp_processor_id+0x17/0x20
 [<ffffffff810ba5d6>] ? rcu_eqs_exit_common.isra.43+0x26/0xe0
 [<ffffffff8113539a>] ? context_tracking_user_exit+0x5a/0x1a0
 [<ffffffff810a693d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
 [<ffffffff81002b81>] do_notify_resume+0x71/0xc0
 [<ffffffff814c1f98>] int_signal+0x12/0x17
blkid           D ffff8807c6b88000     0  8549      1 0x00000006
 ffff8807c6bb39b8 0000000000000002 ffff8807c6b88000 ffff8807c6bb3fd8
 00000000000131c0 00000000000131c0 ffff8807d168c460 ffff88085fc33ad0
 ffff88085ff88a38 ffff8807c6bb3a40 0000000000000002 ffffffff81135db0
Call Trace:
 [<ffffffff81135db0>] ? wait_on_page_read+0x60/0x60
 [<ffffffff814bc0ed>] io_schedule+0x9d/0x130
 [<ffffffff81135dbe>] sleep_on_page+0xe/0x20
 [<ffffffff814bc738>] __wait_on_bit_lock+0x48/0xb0
 [<ffffffff81135eca>] __lock_page+0x6a/0x70
 [<ffffffff8109c8e0>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff811474cf>] truncate_inode_pages_range+0x3ff/0x690
 [<ffffffff81147775>] truncate_inode_pages+0x15/0x20
 [<ffffffff811d3425>] kill_bdev+0x35/0x40
 [<ffffffff811d49a9>] __blkdev_put+0x69/0x1b0
 [<ffffffff811d5450>] blkdev_put+0x50/0x160
 [<ffffffff811d5615>] blkdev_close+0x25/0x30
 [<ffffffff8119a37a>] __fput+0xea/0x1f0
 [<ffffffff8119a4ce>] ____fput+0xe/0x10
 [<ffffffff81074ddc>] task_work_run+0xac/0xe0
 [<ffffffff8104ff67>] do_exit+0x2c7/0xc60
 [<ffffffff81064091>] ? get_signal_to_deliver+0xd1/0x940
 [<ffffffff814c118c>] ? _raw_spin_unlock_irq+0x2c/0x60
 [<ffffffff81051cac>] do_group_exit+0x4c/0xc0
 [<ffffffff810642a1>] get_signal_to_deliver+0x2e1/0x940
 [<ffffffff81002528>] do_signal+0x48/0x630
 [<ffffffff811d3f77>] ? blkdev_read_iter+0x37/0x40
 [<ffffffff8119809e>] ? new_sync_read+0x7e/0xb0
 [<ffffffff8127f0d7>] ? debug_smp_processor_id+0x17/0x20
 [<ffffffff810ba5d6>] ? rcu_eqs_exit_common.isra.43+0x26/0xe0
 [<ffffffff8113539a>] ? context_tracking_user_exit+0x5a/0x1a0
 [<ffffffff810a693d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
 [<ffffffff81002b81>] do_notify_resume+0x71/0xc0
 [<ffffffff814c1f98>] int_signal+0x12/0x17
blkid           D ffff8807c7268000     0  8615      1 0x00000006
 ffff8807d43b39b8 0000000000000002 ffff8807c7268000 ffff8807d43b3fd8
 00000000000131c0 00000000000131c0 ffff88083b4a8000 ffff88085fcb3ad0
 ffff88085ffb0038 ffff8807d43b3a40 0000000000000002 ffffffff81135db0
Call Trace:
 [<ffffffff81135db0>] ? wait_on_page_read+0x60/0x60
 [<ffffffff814bc0ed>] io_schedule+0x9d/0x130
 [<ffffffff81135dbe>] sleep_on_page+0xe/0x20
 [<ffffffff814bc738>] __wait_on_bit_lock+0x48/0xb0
 [<ffffffff81135eca>] __lock_page+0x6a/0x70
 [<ffffffff8109c8e0>] ? autoremove_wake_function+0x40/0x40
 [<ffffffff811474cf>] truncate_inode_pages_range+0x3ff/0x690
 [<ffffffff81147775>] truncate_inode_pages+0x15/0x20
 [<ffffffff811d3425>] kill_bdev+0x35/0x40
 [<ffffffff811d49a9>] __blkdev_put+0x69/0x1b0
 [<ffffffff811d5450>] blkdev_put+0x50/0x160
 [<ffffffff811d5615>] blkdev_close+0x25/0x30
 [<ffffffff8119a37a>] __fput+0xea/0x1f0
 [<ffffffff8119a4ce>] ____fput+0xe/0x10
 [<ffffffff81074ddc>] task_work_run+0xac/0xe0
 [<ffffffff8104ff67>] do_exit+0x2c7/0xc60
 [<ffffffff81064091>] ? get_signal_to_deliver+0xd1/0x940
 [<ffffffff814c118c>] ? _raw_spin_unlock_irq+0x2c/0x60
 [<ffffffff81051cac>] do_group_exit+0x4c/0xc0
 [<ffffffff810642a1>] get_signal_to_deliver+0x2e1/0x940
 [<ffffffff81002528>] do_signal+0x48/0x630
 [<ffffffff811d3f77>] ? blkdev_read_iter+0x37/0x40
 [<ffffffff8119809e>] ? new_sync_read+0x7e/0xb0
 [<ffffffff8127f0d7>] ? debug_smp_processor_id+0x17/0x20
 [<ffffffff810ba5d6>] ? rcu_eqs_exit_common.isra.43+0x26/0xe0
 [<ffffffff8113539a>] ? context_tracking_user_exit+0x5a/0x1a0
 [<ffffffff810a693d>] ? trace_hardirqs_on_caller+0xfd/0x1c0
 [<ffffffff81002b81>] do_notify_resume+0x71/0xc0
 [<ffffffff814c1f98>] int_signal+0x12/0x17
--
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