Hung task "jbd2/dm-16-8" in jbd2_journal_commit_transaction() when issuing I/O through a software RAID or mirror device

Solution Verified - Updated -


  • System crashes or hangs with the below hung task:

    crash> bt 1324
    PID: 1324   TASK: ffff880859858000  CPU: 1   COMMAND: "jbd2/dm-16-8"
     #0 [ffff880854373a60] __schedule at ffffffff816a8f65
     #1 [ffff880854373ac8] schedule at ffffffff816a94e9
     #2 [ffff880854373ad8] schedule_timeout at ffffffff816a6ff9
     #3 [ffff880854373b88] io_schedule_timeout at ffffffff816a8b6d
     #4 [ffff880854373bb8] io_schedule at ffffffff816a8c08
     #5 [ffff880854373bc8] bit_wait_io at ffffffff816a7621
     #6 [ffff880854373be0] __wait_on_bit at ffffffff816a7145
     #7 [ffff880854373c20] out_of_line_wait_on_bit at ffffffff816a71f1
     #8 [ffff880854373c98] __wait_on_buffer at ffffffff812365ca
     #9 [ffff880854373ca8] jbd2_journal_commit_transaction at ffffffffc06e0fa2 [jbd2]
    #10 [ffff880854373e48] kjournald2 at ffffffffc06e6a79 [jbd2]
    #11 [ffff880854373ec8] kthread at ffffffff810b098f
    #12 [ffff880854373f50] ret_from_fork at ffffffff816b4f58


  • Red Hat Enterprise Linux 7
  • kernel 3.10.0-693.2.2.el7.x86_64 (the issue may affect other kernel versions after 3.10.0-514.21.2.el7.x86_64 and before kernel-3.10.0-862.el7)
  • LVM RAID or other device-mapper device in RAID configuration

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