[22596.884250] sysrq: SysRq : This sysrq operation is disabled.

I got this, if I try to trigger those sysreq events by echoing t/m into
that procfs file. I'm anyway curious how sysreq stuffs can be
enabled/disabled, since I seldom use ALT-SYSREQ-.... combos as well, and
many of them just reports the same as with this procfs trigger:
operation is disabled.

One thing though:

If I attach the thumb drive, everything is fine, lsblk shows it, etc, I
can remove it, lsblk does not show it, no problem. The problem seems to
have after the first event when I try to write onto the device, then
whatever I try even remove thumb drive physically, lsblk still shows it,
all the "sync" commands (and anything which tries to write onto) stuck
and cannot be killed. So even shutdown of system is problematic at this
point. Now I've tried fdisk (btw, no partition on the thumb drive). Just
displaying, everything is OK. However after the "w" command the problems
begins. By checking the /proc entry for the PID of the fdisk, I see:

# cat /proc/11283/status 
Name:   fdisk
Umask:  0022
State:  D (disk sleep)
[...]


# cat /proc/11283/stat
11283 (fdisk) D 11084 11283 10324 34827 11283 4194560 673 0 4 0 0 1 0 0 20 0 1 
0 2254524 21024768 877 18446744073709551615 94293651558400 94293651671008 
140732927217664 0 0 0 0 0 0 1 0 0 17 1 0 0 16 0 0 94293653771504 94293653778500 
94293676326912 140732927223610 140732927223625 140732927223625 140732927225836 0

Full output of status file:

# cat /proc/11283/status 
Name:   fdisk
Umask:  0022
State:  D (disk sleep)
Tgid:   11283
Ngid:   0
Pid:    11283
PPid:   11084
TracerPid:      0
Uid:    0       0       0       0
Gid:    0       0       0       0
FDSize: 256
Groups: 0 
NStgid: 11283
NSpid:  11283
NSpgid: 11283
NSsid:  10324
VmPeak:    21568 kB
VmSize:    20532 kB
VmLck:         0 kB
VmPin:         0 kB
VmHWM:      4176 kB
VmRSS:      3508 kB
RssAnon:             372 kB
RssFile:            3136 kB
RssShmem:              0 kB
VmData:      284 kB
VmStk:       132 kB
VmExe:       112 kB
VmLib:      3144 kB
VmPTE:        80 kB
VmSwap:        0 kB
HugetlbPages:          0 kB
CoreDumping:    0
Threads:        1
SigQ:   0/13289
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000000000
SigCgt: 0000000000000000
CapInh: 0000000000000000
CapPrm: 0000003fffffffff
CapEff: 0000003fffffffff
CapBnd: 0000003fffffffff
CapAmb: 0000000000000000
NoNewPrivs:     0
Seccomp:        0
Cpus_allowed:   f
Cpus_allowed_list:      0-3
Mems_allowed:   
00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001
Mems_allowed_list:      0
voluntary_ctxt_switches:        73
nonvoluntary_ctxt_switches:     0

-- 
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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