[DRBD-user] INFO: task cqueue:2853 blocked for more than 120 seconds.

Mark mark-sd2te3fp at mstier.de
Sat Jul 16 18:41:43 CEST 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


opensuse 11.2, xen 3.4.1 pv on DRBD 8.3.11, x86_64, AMD Opteron.

XEN blkback driver hangs when doing "drbdsetup /dev/drbd0 syncer -r 5M"
etc. while DRBD is syncing and the XEN PV guest is doing disk I/O on the
DRBD device. Once I even succeeded in getting the syncer to hang (stall).

# uname -a
Linux marvin 2.6.31.14-0.8-xen #1 SMP 2011-04-06 18:09:24 +0200 x86_64
x86_64 x86_64 GNU/Linux



 INFO: task cqueue:2853 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 cqueue        D ffff88001e473348     0  2853      2 0x00000000
  ffff88001a5c1b70 0000000000000246 0000000000000000 ffff88001a5c1af0
  ffff88001efa4000 ffff88001a5c1b38 000000000000a380 ffff88001ff628a8
  000000000000a380 000000000000a380 000000000000a380 0000000000007d00
 Call Trace:
  [<ffffffffa01eea05>] drbd_al_shrink+0xb5/0x170 [drbd]
  [<ffffffffa0207833>] drbd_nl_syncer_conf+0x4a3/0x890 [drbd]
  [<ffffffffa020abcf>] drbd_connector_callback+0x15f/0x280 [drbd]
  [<ffffffff802eb972>] cn_queue_wrapper+0x32/0x70
  [<ffffffff800694d3>] run_workqueue+0x83/0x230
  [<ffffffff80069734>] worker_thread+0xb4/0x140
  [<ffffffff8006fba6>] kthread+0xb6/0xc0
  [<ffffffff8000d3ea>] child_rip+0xa/0x20
 INFO: task blkback.2.xvda:5045 blocked for more than 120 seconds.
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 blkback.2.xvd D 0000000058a23d86     0  5045      2 0x00000000
  ffff88001e5355d0 0000000000000246 ffff88001e535530 ffff88001e535550
  ffff88001e8128c0 ffff88001e535598 000000000000a380 ffff88001e6568e8
  000000000000a380 000000000000a380 000000000000a380 0000000000007d00
 Call Trace:
  [<ffffffffa01f0f55>] drbd_al_begin_io+0x205/0x2c0 [drbd]
  [<ffffffffa01ecc98>] drbd_make_request_common+0xc18/0x1730 [drbd]
  [<ffffffffa01edfe2>] drbd_make_request+0x832/0x930 [drbd]
  [<ffffffff80222fcb>] generic_make_request+0x19b/0x4c0
  [<ffffffff8022336d>] submit_bio+0x7d/0x110
  [<ffffffffa039c003>] dispatch_rw_block_io+0x823/0xa70 [blkbk]
  [<ffffffffa039c557>] do_block_io_op+0x307/0x3f0 [blkbk]
  [<ffffffffa039c6e1>] blkif_schedule+0xa1/0x2f0 [blkbk]
  [<ffffffff8006fba6>] kthread+0xb6/0xc0
  [<ffffffff8000d3ea>] child_rip+0xa/0x20





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