[<ffffffff81576c09>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff81576c09>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839fb210>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=-20 stuck for 30s!
Showing busy workqueues and worker pools:
workqueue kblockd: flags=0x18
  pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256
    pending: blk_mq_requeue_work