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Hardware node is unresponsive after backups are initiated

APPLIES TO:
  • Parallels Cloud Server 6.0
  • Parallels Virtuozzo Containers for Linux
  • Parallels Server

Symptoms

Hardware node is unresponsive after backups are initiated.

The following stack traces of hung processes can be found in /var/log/messages:

    Aug 17 04:14:09 node1 kernel: [1171504.171462] INFO: task prl_disp_servic:180988 blocked for more than 120 seconds.
    Aug 17 04:14:09 node1 kernel: [1171504.171636] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    Aug 17 04:14:09 node1 kernel: [1171504.171787] prl_disp_serv D ffff8807d4fc0880     0 180988      1    0 0x00000000
    Aug 17 04:14:09 node1 kernel: [1171504.171964]  ffff880689f43dc8 0000000000000082 0000000000000000 ffffffff811b5301
    Aug 17 04:14:09 node1 kernel: [1171504.172147]  0000000000000000 ffff88087cb5c858 ffff880689f43d68 ffff881078071fd0
    Aug 17 04:14:09 node1 kernel: [1171504.172329]  0000000000000000 0000000145d51cba ffff8807d4fc0e48 000000000001ea80
    Aug 17 04:14:09 node1 kernel: [1171504.172526] Call Trace:
    Aug 17 04:14:09 node1 kernel: [1171504.172629]  [<ffffffff811b5301>] ? __link_path_walk+0x151/0x1060
    Aug 17 04:14:09 node1 kernel: [1171504.172637]  [<ffffffff811a77ea>] __sb_start_write+0x15a/0x190
    Aug 17 04:14:09 node1 kernel: [1171504.172643]  [<ffffffff8109d210>] ? autoremove_wake_function+0x0/0x40
    Aug 17 04:14:09 node1 kernel: [1171504.172645]  [<ffffffff811b65f2>] ? do_path_lookup+0x32/0xa0
    Aug 17 04:14:09 node1 kernel: [1171504.172650]  [<ffffffff811c7cd4>] mnt_want_write+0x24/0x50
    Aug 17 04:14:09 node1 kernel: [1171504.172652]  [<ffffffff811b6b7b>] do_unlinkat+0x8b/0x1b0
    Aug 17 04:14:09 node1 kernel: [1171504.172655]  [<ffffffff811ab1c6>] ? sys_newstat+0x36/0x50
    Aug 17 04:14:09 node1 kernel: [1171504.172658]  [<ffffffff811b6cb6>] sys_unlink+0x16/0x20
    Aug 17 04:14:09 node1 kernel: [1171504.172663]  [<ffffffff8100b102>] system_call_fastpath+0x16/0x1b

Cause

Processes get hung in sb_start_write after VZFS container backup.

Resolution

Update the kernel to 80.x version once it is available.

Search words:

hung

stuck

sb_start_write

hardware node

backup

unresponsive




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