I can't answer what is happening here. But can you obtain more information 
using SysRq-t
and SysRq-m as described at 
https://akari.osdn.jp/capturing-kernel-messages.html#Tips5 ?

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1762450

Title:
  [18.04] writing on thumb drives causes hang for write op, shutdown and
  'sync' command

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I've upgraded to 18.04. Since then, it's impossible to use thumb-
  drives. If I try, on the first write operation, that operation hangs.
  Trying to issue a 'sync' command that hangs too. After a while (some
  minutes or so?) I see the following in kernel log / dmesg (see later).
  It's not even possible to cleanly shut the computer down, as it also
  hangs then.

  kernel is:

  4.15.0-15-generic
  Linux oxygene 4.15.0-15-generic #16-Ubuntu SMP Wed Apr 4 13:58:14 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux
  $ dpkg -S /boot/vmlinuz-4.15.0-15-generic 
  linux-image-4.15.0-15-generic: /boot/vmlinuz-4.15.0-15-generic
  $ dpkg -l linux-image-4.15.0-15-generic
  ii  linux-image-4.15.0-15-generic            4.15.0-15.16              amd64  
                   Linux kernel image for version 4.15.0 on 64 bit x86 SMP

  dmesg:

  
  [  110.931501] usb 6-1: new high-speed USB device number 2 using xhci_hcd
  [  111.083432] usb 6-1: New USB device found, idVendor=13fe, idProduct=1d00
  [  111.083438] usb 6-1: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
  [  111.083441] usb 6-1: Product: DataTraveler 2.0
  [  111.083444] usb 6-1: Manufacturer: Kingston
  [  111.083447] usb 6-1: SerialNumber: 5B7402949950
  [  111.157729] usb-storage 6-1:1.0: USB Mass Storage device detected
  [  111.157882] scsi host6: usb-storage 6-1:1.0
  [  111.158826] usbcore: registered new interface driver usb-storage
  [  111.174387] usbcore: registered new interface driver uas
  [  112.172295] scsi 6:0:0:0: Direct-Access     Kingston DataTraveler 2.0 PMAP 
PQ: 0 ANSI: 0 CCS
  [  112.203451] sd 6:0:0:0: Attached scsi generic sg1 type 0
  [  112.443337] sd 6:0:0:0: [sdb] 4030464 512-byte logical blocks: (2.06 
GB/1.92 GiB)
  [  112.443462] sd 6:0:0:0: [sdb] Write Protect is off
  [  112.443464] sd 6:0:0:0: [sdb] Mode Sense: 23 00 00 00
  [  112.443586] sd 6:0:0:0: [sdb] No Caching mode page found
  [  112.443591] sd 6:0:0:0: [sdb] Assuming drive cache: write through
  [  112.447045] sd 6:0:0:0: [sdb] Attached SCSI removable disk

  this was ok, the problem is from here:

  [  363.231738] INFO: task fdisk:1798 blocked for more than 120 seconds.
  [  363.231745]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  363.231747] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  363.231750] fdisk           D    0  1798   1728 0x00000000
  [  363.231754] Call Trace:
  [  363.231764]  __schedule+0x297/0x8b0
  [  363.231768]  ? fdatawait_one_bdev+0x20/0x20
  [  363.231771]  schedule+0x2c/0x80
  [  363.231775]  io_schedule+0x16/0x40
  [  363.231779]  wait_on_page_bit_common+0xd8/0x160
  [  363.231782]  ? page_cache_tree_insert+0xe0/0xe0
  [  363.231785]  __filemap_fdatawait_range+0xfa/0x160
  [  363.231788]  ? __filemap_fdatawrite_range+0xc1/0x100
  [  363.231791]  ? __filemap_fdatawrite_range+0xcd/0x100
  [  363.231794]  ? __sync_filesystem+0x60/0x60
  [  363.231797]  filemap_fdatawait_keep_errors+0x1e/0x40
  [  363.231799]  fdatawait_one_bdev+0x16/0x20
  [  363.231802]  iterate_bdevs+0xb7/0x160
  [  363.231805]  sys_sync+0x7e/0xb0
  [  363.231809]  do_syscall_64+0x73/0x130
  [  363.231813]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  363.231816] RIP: 0033:0x7f2fcff17287
  [  363.231817] RSP: 002b:00007fffbbea61a8 EFLAGS: 00000202 ORIG_RAX: 
00000000000000a2
  [  363.231820] RAX: ffffffffffffffda RBX: 000056096b767400 RCX: 
00007f2fcff17287
  [  363.231821] RDX: 0000000000000000 RSI: 000056096b766018 RDI: 
000056096b767400
  [  363.231823] RBP: 00007fffbbea82d8 R08: 000000000000000a R09: 
7472617020656854
  [  363.231824] R10: 0000000000000008 R11: 0000000000000202 R12: 
000056096a25b198
  [  363.231825] R13: 0000000000000000 R14: 000056096a25b198 R15: 
0000000000000000
  [  484.045928] INFO: task fdisk:1798 blocked for more than 120 seconds.
  [  484.045934]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  484.045936] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  484.045939] fdisk           D    0  1798   1728 0x00000000
  [  484.045942] Call Trace:
  [  484.045950]  __schedule+0x297/0x8b0
  [  484.045954]  ? fdatawait_one_bdev+0x20/0x20
  [  484.045956]  schedule+0x2c/0x80
  [  484.045959]  io_schedule+0x16/0x40
  [  484.045962]  wait_on_page_bit_common+0xd8/0x160
  [  484.045965]  ? page_cache_tree_insert+0xe0/0xe0
  [  484.045967]  __filemap_fdatawait_range+0xfa/0x160
  [  484.045970]  ? __filemap_fdatawrite_range+0xc1/0x100
  [  484.045972]  ? __filemap_fdatawrite_range+0xcd/0x100
  [  484.045975]  ? __sync_filesystem+0x60/0x60
  [  484.045977]  filemap_fdatawait_keep_errors+0x1e/0x40
  [  484.045979]  fdatawait_one_bdev+0x16/0x20
  [  484.045981]  iterate_bdevs+0xb7/0x160
  [  484.045984]  sys_sync+0x7e/0xb0
  [  484.045987]  do_syscall_64+0x73/0x130
  [  484.045990]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  484.045992] RIP: 0033:0x7f2fcff17287
  [  484.045994] RSP: 002b:00007fffbbea61a8 EFLAGS: 00000202 ORIG_RAX: 
00000000000000a2
  [  484.045996] RAX: ffffffffffffffda RBX: 000056096b767400 RCX: 
00007f2fcff17287
  [  484.045997] RDX: 0000000000000000 RSI: 000056096b766018 RDI: 
000056096b767400
  [  484.045998] RBP: 00007fffbbea82d8 R08: 000000000000000a R09: 
7472617020656854
  [  484.046000] R10: 0000000000000008 R11: 0000000000000202 R12: 
000056096a25b198
  [  484.046001] R13: 0000000000000000 R14: 000056096a25b198 R15: 
0000000000000000
  [  484.046024] INFO: task sync:2149 blocked for more than 120 seconds.
  [  484.046026]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  484.046028] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  484.046030] sync            D    0  2149   1821 0x00000004
  [  484.046032] Call Trace:
  [  484.046035]  __schedule+0x297/0x8b0
  [  484.046038]  schedule+0x2c/0x80
  [  484.046040]  schedule_preempt_disabled+0xe/0x10
  [  484.046043]  __mutex_lock.isra.2+0x18c/0x4d0
  [  484.046045]  ? wait_woken+0x80/0x80
  [  484.046048]  ? fdatawait_one_bdev+0x20/0x20
  [  484.046050]  __mutex_lock_slowpath+0x13/0x20
  [  484.046053]  ? __mutex_lock_slowpath+0x13/0x20
  [  484.046055]  mutex_lock+0x2f/0x40
  [  484.046057]  iterate_bdevs+0xa0/0x160
  [  484.046059]  sys_sync+0x70/0xb0
  [  484.046062]  do_syscall_64+0x73/0x130
  [  484.046065]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  484.046066] RIP: 0033:0x7f6707b3f287
  [  484.046067] RSP: 002b:00007ffd0e393dc8 EFLAGS: 00000246 ORIG_RAX: 
00000000000000a2
  [  484.046069] RAX: ffffffffffffffda RBX: 00007ffd0e393ef8 RCX: 
00007f6707b3f287
  [  484.046071] RDX: 00007f6707e16001 RSI: 0000000000000000 RDI: 
00007f6707bdd4b0
  [  484.046072] RBP: 0000000000000001 R08: 0000000000000000 R09: 
0000000000000000
  [  484.046073] R10: 0000564af80d2010 R11: 0000000000000246 R12: 
0000000000000001
  [  484.046074] R13: 0000000000000000 R14: 0000000000000000 R15: 
0000000000000000
  [  484.046077] INFO: task fdisk:2199 blocked for more than 120 seconds.
  [  484.046079]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  484.046081] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  484.046083] fdisk           D    0  2199   2198 0x00000004
  [  484.046085] Call Trace:
  [  484.046088]  __schedule+0x297/0x8b0
  [  484.046090]  schedule+0x2c/0x80
  [  484.046092]  schedule_preempt_disabled+0xe/0x10
  [  484.046095]  __mutex_lock.isra.2+0x18c/0x4d0
  [  484.046098]  __mutex_lock_slowpath+0x13/0x20
  [  484.046100]  ? __mutex_lock_slowpath+0x13/0x20
  [  484.046102]  mutex_lock+0x2f/0x40
  [  484.046104]  __blkdev_get+0x71/0x4c0
  [  484.046107]  blkdev_get+0x129/0x320
  [  484.046109]  ? __fsnotify_parent+0x96/0x120
  [  484.046112]  ? security_capable+0x4e/0x70
  [  484.046114]  blkdev_open+0x95/0xf0
  [  484.046117]  do_dentry_open+0x1c2/0x310
  [  484.046119]  ? __inode_permission+0x5b/0x160
  [  484.046121]  ? bd_acquire+0xd0/0xd0
  [  484.046124]  vfs_open+0x4f/0x80
  [  484.046126]  path_openat+0x66e/0x1770
  [  484.046129]  do_filp_open+0x9b/0x110
  [  484.046132]  ? __check_object_size+0xaf/0x1b0
  [  484.046135]  ? __alloc_fd+0x46/0x170
  [  484.046138]  do_sys_open+0x1bb/0x2c0
  [  484.046140]  ? do_sys_open+0x1bb/0x2c0
  [  484.046143]  SyS_openat+0x14/0x20
  [  484.046145]  do_syscall_64+0x73/0x130
  [  484.046148]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  484.046150] RIP: 0033:0x7f7bf2007c8e
  [  484.046151] RSP: 002b:00007ffde2a82080 EFLAGS: 00000246 ORIG_RAX: 
0000000000000101
  [  484.046153] RAX: ffffffffffffffda RBX: 000055b725656400 RCX: 
00007f7bf2007c8e
  [  484.046154] RDX: 0000000000080002 RSI: 00007ffde2a827c3 RDI: 
00000000ffffff9c
  [  484.046155] RBP: 0000000000000000 R08: 000000000000000a R09: 
6d6572206c6c6977
  [  484.046156] R10: 0000000000000000 R11: 0000000000000246 R12: 
00007f7bf29bd444
  [  484.046157] R13: 00007ffde2a827c3 R14: 0000000000000000 R15: 
0000000000000000
  [  604.909492] INFO: task fdisk:1798 blocked for more than 120 seconds.
  [  604.909499]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  604.909502] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  604.909505] fdisk           D    0  1798   1728 0x00000000
  [  604.909509] Call Trace:
  [  604.909519]  __schedule+0x297/0x8b0
  [  604.909523]  ? fdatawait_one_bdev+0x20/0x20
  [  604.909526]  schedule+0x2c/0x80
  [  604.909530]  io_schedule+0x16/0x40
  [  604.909533]  wait_on_page_bit_common+0xd8/0x160
  [  604.909536]  ? page_cache_tree_insert+0xe0/0xe0
  [  604.909540]  __filemap_fdatawait_range+0xfa/0x160
  [  604.909543]  ? __filemap_fdatawrite_range+0xc1/0x100
  [  604.909546]  ? __filemap_fdatawrite_range+0xcd/0x100
  [  604.909549]  ? __sync_filesystem+0x60/0x60
  [  604.909552]  filemap_fdatawait_keep_errors+0x1e/0x40
  [  604.909554]  fdatawait_one_bdev+0x16/0x20
  [  604.909557]  iterate_bdevs+0xb7/0x160
  [  604.909560]  sys_sync+0x7e/0xb0
  [  604.909564]  do_syscall_64+0x73/0x130
  [  604.909568]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  604.909571] RIP: 0033:0x7f2fcff17287
  [  604.909572] RSP: 002b:00007fffbbea61a8 EFLAGS: 00000202 ORIG_RAX: 
00000000000000a2
  [  604.909575] RAX: ffffffffffffffda RBX: 000056096b767400 RCX: 
00007f2fcff17287
  [  604.909576] RDX: 0000000000000000 RSI: 000056096b766018 RDI: 
000056096b767400
  [  604.909578] RBP: 00007fffbbea82d8 R08: 000000000000000a R09: 
7472617020656854
  [  604.909579] R10: 0000000000000008 R11: 0000000000000202 R12: 
000056096a25b198
  [  604.909581] R13: 0000000000000000 R14: 000056096a25b198 R15: 
0000000000000000
  [  604.909607] INFO: task sync:2149 blocked for more than 120 seconds.
  [  604.909610]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  604.909612] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  604.909614] sync            D    0  2149   1821 0x00000004
  [  604.909617] Call Trace:
  [  604.909621]  __schedule+0x297/0x8b0
  [  604.909624]  schedule+0x2c/0x80
  [  604.909627]  schedule_preempt_disabled+0xe/0x10
  [  604.909630]  __mutex_lock.isra.2+0x18c/0x4d0
  [  604.909633]  ? wait_woken+0x80/0x80
  [  604.909636]  ? fdatawait_one_bdev+0x20/0x20
  [  604.909639]  __mutex_lock_slowpath+0x13/0x20
  [  604.909642]  ? __mutex_lock_slowpath+0x13/0x20
  [  604.909645]  mutex_lock+0x2f/0x40
  [  604.909647]  iterate_bdevs+0xa0/0x160
  [  604.909650]  sys_sync+0x70/0xb0
  [  604.909653]  do_syscall_64+0x73/0x130
  [  604.909657]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  604.909659] RIP: 0033:0x7f6707b3f287
  [  604.909660] RSP: 002b:00007ffd0e393dc8 EFLAGS: 00000246 ORIG_RAX: 
00000000000000a2
  [  604.909662] RAX: ffffffffffffffda RBX: 00007ffd0e393ef8 RCX: 
00007f6707b3f287
  [  604.909664] RDX: 00007f6707e16001 RSI: 0000000000000000 RDI: 
00007f6707bdd4b0
  [  604.909665] RBP: 0000000000000001 R08: 0000000000000000 R09: 
0000000000000000
  [  604.909667] R10: 0000564af80d2010 R11: 0000000000000246 R12: 
0000000000000001
  [  604.909668] R13: 0000000000000000 R14: 0000000000000000 R15: 
0000000000000000
  [  604.909671] INFO: task fdisk:2199 blocked for more than 120 seconds.
  [  604.909674]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  604.909676] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  604.909678] fdisk           D    0  2199   2198 0x00000004
  [  604.909681] Call Trace:
  [  604.909684]  __schedule+0x297/0x8b0
  [  604.909688]  schedule+0x2c/0x80
  [  604.909690]  schedule_preempt_disabled+0xe/0x10
  [  604.909693]  __mutex_lock.isra.2+0x18c/0x4d0
  [  604.909697]  __mutex_lock_slowpath+0x13/0x20
  [  604.909700]  ? __mutex_lock_slowpath+0x13/0x20
  [  604.909702]  mutex_lock+0x2f/0x40
  [  604.909705]  __blkdev_get+0x71/0x4c0
  [  604.909708]  blkdev_get+0x129/0x320
  [  604.909710]  ? __fsnotify_parent+0x96/0x120
  [  604.909714]  ? security_capable+0x4e/0x70
  [  604.909717]  blkdev_open+0x95/0xf0
  [  604.909721]  do_dentry_open+0x1c2/0x310
  [  604.909723]  ? __inode_permission+0x5b/0x160
  [  604.909726]  ? bd_acquire+0xd0/0xd0
  [  604.909729]  vfs_open+0x4f/0x80
  [  604.909732]  path_openat+0x66e/0x1770
  [  604.909735]  do_filp_open+0x9b/0x110
  [  604.909739]  ? __check_object_size+0xaf/0x1b0
  [  604.909742]  ? __alloc_fd+0x46/0x170
  [  604.909746]  do_sys_open+0x1bb/0x2c0
  [  604.909748]  ? do_sys_open+0x1bb/0x2c0
  [  604.909752]  SyS_openat+0x14/0x20
  [  604.909755]  do_syscall_64+0x73/0x130
  [  604.909759]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  604.909760] RIP: 0033:0x7f7bf2007c8e
  [  604.909762] RSP: 002b:00007ffde2a82080 EFLAGS: 00000246 ORIG_RAX: 
0000000000000101
  [  604.909764] RAX: ffffffffffffffda RBX: 000055b725656400 RCX: 
00007f7bf2007c8e
  [  604.909766] RDX: 0000000000080002 RSI: 00007ffde2a827c3 RDI: 
00000000ffffff9c
  [  604.909767] RBP: 0000000000000000 R08: 000000000000000a R09: 
6d6572206c6c6977
  [  604.909768] R10: 0000000000000000 R11: 0000000000000246 R12: 
00007f7bf29bd444
  [  604.909769] R13: 00007ffde2a827c3 R14: 0000000000000000 R15: 
0000000000000000
  [  725.800041] INFO: task fdisk:1798 blocked for more than 120 seconds.
  [  725.800050]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  725.800052] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  725.800056] fdisk           D    0  1798   1728 0x00000000
  [  725.800060] Call Trace:
  [  725.800071]  __schedule+0x297/0x8b0
  [  725.800076]  ? fdatawait_one_bdev+0x20/0x20
  [  725.800079]  schedule+0x2c/0x80
  [  725.800083]  io_schedule+0x16/0x40
  [  725.800088]  wait_on_page_bit_common+0xd8/0x160
  [  725.800091]  ? page_cache_tree_insert+0xe0/0xe0
  [  725.800095]  __filemap_fdatawait_range+0xfa/0x160
  [  725.800099]  ? __filemap_fdatawrite_range+0xc1/0x100
  [  725.800102]  ? __filemap_fdatawrite_range+0xcd/0x100
  [  725.800106]  ? __sync_filesystem+0x60/0x60
  [  725.800110]  filemap_fdatawait_keep_errors+0x1e/0x40
  [  725.800113]  fdatawait_one_bdev+0x16/0x20
  [  725.800117]  iterate_bdevs+0xb7/0x160
  [  725.800120]  sys_sync+0x7e/0xb0
  [  725.800124]  do_syscall_64+0x73/0x130
  [  725.800128]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  725.800132] RIP: 0033:0x7f2fcff17287
  [  725.800134] RSP: 002b:00007fffbbea61a8 EFLAGS: 00000202 ORIG_RAX: 
00000000000000a2
  [  725.800137] RAX: ffffffffffffffda RBX: 000056096b767400 RCX: 
00007f2fcff17287
  [  725.800139] RDX: 0000000000000000 RSI: 000056096b766018 RDI: 
000056096b767400
  [  725.800141] RBP: 00007fffbbea82d8 R08: 000000000000000a R09: 
7472617020656854
  [  725.800143] R10: 0000000000000008 R11: 0000000000000202 R12: 
000056096a25b198
  [  725.800145] R13: 0000000000000000 R14: 000056096a25b198 R15: 
0000000000000000
  [  725.800172] INFO: task sync:2149 blocked for more than 120 seconds.
  [  725.800177]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  725.800179] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  725.800183] sync            D    0  2149   1821 0x00000004
  [  725.800186] Call Trace:
  [  725.800190]  __schedule+0x297/0x8b0
  [  725.800193]  schedule+0x2c/0x80
  [  725.800196]  schedule_preempt_disabled+0xe/0x10
  [  725.800199]  __mutex_lock.isra.2+0x18c/0x4d0
  [  725.800203]  ? wait_woken+0x80/0x80
  [  725.800206]  ? fdatawait_one_bdev+0x20/0x20
  [  725.800209]  __mutex_lock_slowpath+0x13/0x20
  [  725.800212]  ? __mutex_lock_slowpath+0x13/0x20
  [  725.800214]  mutex_lock+0x2f/0x40
  [  725.800217]  iterate_bdevs+0xa0/0x160
  [  725.800220]  sys_sync+0x70/0xb0
  [  725.800223]  do_syscall_64+0x73/0x130
  [  725.800227]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  725.800229] RIP: 0033:0x7f6707b3f287
  [  725.800230] RSP: 002b:00007ffd0e393dc8 EFLAGS: 00000246 ORIG_RAX: 
00000000000000a2
  [  725.800233] RAX: ffffffffffffffda RBX: 00007ffd0e393ef8 RCX: 
00007f6707b3f287
  [  725.800234] RDX: 00007f6707e16001 RSI: 0000000000000000 RDI: 
00007f6707bdd4b0
  [  725.800235] RBP: 0000000000000001 R08: 0000000000000000 R09: 
0000000000000000
  [  725.800237] R10: 0000564af80d2010 R11: 0000000000000246 R12: 
0000000000000001
  [  725.800238] R13: 0000000000000000 R14: 0000000000000000 R15: 
0000000000000000
  [  725.800241] INFO: task fdisk:2199 blocked for more than 120 seconds.
  [  725.800244]       Tainted: G           OE    4.15.0-15-generic #16-Ubuntu
  [  725.800246] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  725.800248] fdisk           D    0  2199   2198 0x00000004
  [  725.800251] Call Trace:
  [  725.800254]  __schedule+0x297/0x8b0
  [  725.800258]  schedule+0x2c/0x80
  [  725.800260]  schedule_preempt_disabled+0xe/0x10
  [  725.800263]  __mutex_lock.isra.2+0x18c/0x4d0
  [  725.800267]  __mutex_lock_slowpath+0x13/0x20
  [  725.800270]  ? __mutex_lock_slowpath+0x13/0x20
  [  725.800273]  mutex_lock+0x2f/0x40
  [  725.800275]  __blkdev_get+0x71/0x4c0
  [  725.800278]  blkdev_get+0x129/0x320
  [  725.800281]  ? __fsnotify_parent+0x96/0x120
  [  725.800285]  ? security_capable+0x4e/0x70
  [  725.800288]  blkdev_open+0x95/0xf0
  [  725.800291]  do_dentry_open+0x1c2/0x310
  [  725.800294]  ? __inode_permission+0x5b/0x160
  [  725.800296]  ? bd_acquire+0xd0/0xd0
  [  725.800299]  vfs_open+0x4f/0x80
  [  725.800302]  path_openat+0x66e/0x1770
  [  725.800306]  do_filp_open+0x9b/0x110
  [  725.800309]  ? __check_object_size+0xaf/0x1b0
  [  725.800313]  ? __alloc_fd+0x46/0x170
  [  725.800316]  do_sys_open+0x1bb/0x2c0
  [  725.800319]  ? do_sys_open+0x1bb/0x2c0
  [  725.800322]  SyS_openat+0x14/0x20
  [  725.800325]  do_syscall_64+0x73/0x130
  [  725.800329]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  725.800331] RIP: 0033:0x7f7bf2007c8e
  [  725.800332] RSP: 002b:00007ffde2a82080 EFLAGS: 00000246 ORIG_RAX: 
0000000000000101
  [  725.800335] RAX: ffffffffffffffda RBX: 000055b725656400 RCX: 
00007f7bf2007c8e
  [  725.800336] RDX: 0000000000080002 RSI: 00007ffde2a827c3 RDI: 
00000000ffffff9c
  [  725.800338] RBP: 0000000000000000 R08: 000000000000000a R09: 
6d6572206c6c6977
  [  725.800339] R10: 0000000000000000 R11: 0000000000000246 R12: 
00007f7bf29bd444
  [  725.800340] R13: 00007ffde2a827c3 R14: 0000000000000000 R15: 
0000000000000000

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-15-generic 4.15.0-15.16
  ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
  Uname: Linux 4.15.0-15-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  lgb        1463 F.... pulseaudio
   /dev/snd/controlC0:  lgb        1463 F.... pulseaudio
   /dev/snd/controlC2:  lgb        1463 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Mon Apr  9 17:11:31 2018
  HibernationDevice: RESUME=UUID=c92777cb-b700-4a8e-b937-1ed4983fecb1
  InstallationDate: Installed on 2015-07-10 (1003 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release i386 (20150422)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic 
root=UUID=d203063e-78c0-425a-bee2-0e3ecb4ea74c ro quiet splash 
scsi_mod.use_blk_mq=1 vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-15-generic N/A
   linux-backports-modules-4.15.0-15-generic  N/A
   linux-firmware                             1.173
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2017-06-20 (293 days ago)
  dmi.bios.date: 02/05/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.90
  dmi.board.name: FM2A88M Extreme4+
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP2.90:bd02/05/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnFM2A88MExtreme4+:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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