Article ID: 123426, created on Nov 6, 2014, last review on Nov 6, 2014

  • Applies to:
  • Virtuozzo 6.0

Symptoms

Attempt to delete CT or VM hangs for a long time, prlctl enter command is stuck, Virtual Environments are unmanageable.

In /var/log/messages you can observe similar call stacks indicating that numabalanced daemon is stuck for a while:

May 17 06:05:02 pcs kernel: [2788004.673280] numabalanced  D ffff881e9d1633b0     0 45377      1    0 0x00000000
May 17 06:05:02 pcs kernel: [2788004.673284]  ffff881f2f2b3bc8 0000000000000082 0000000000000000 0000006700000002
May 17 06:05:02 pcs kernel: [2788004.673288]  ffff881f2f2b3b58 ffff881f2f2b3cc8 0000000000714637 ffff881f2f2b2000
May 17 06:05:02 pcs kernel: [2788004.673293]  0000000000000000 00000001a4690d5f ffff881e9d163978 000000000001ec80
May 17 06:05:02 pcs kernel: [2788004.673297] Call Trace:
May 17 06:05:02 pcs kernel: [2788004.673301]  [<ffffffff8152daf5>] schedule_timeout+0x215/0x2e0
May 17 06:05:02 pcs kernel: [2788004.673305]  [<ffffffff8152d344>] wait_for_completion+0xe4/0x120
May 17 06:05:02 pcs kernel: [2788004.673309]  [<ffffffff81061bb0>] ? default_wake_function+0x0/0x20
May 17 06:05:02 pcs kernel: [2788004.673312]  [<ffffffff8109a7e3>] __cancel_work_timer+0x1b3/0x1e0
May 17 06:05:02 pcs kernel: [2788004.673316]  [<ffffffff8109a060>] ? wq_barrier_func+0x0/0x20
May 17 06:05:02 pcs kernel: [2788004.673320]  [<ffffffff8109a822>] cancel_delayed_work_sync+0x12/0x20
May 17 06:05:02 pcs kernel: [2788004.673323]  [<ffffffff8115d8c9>] cancel_gangs_migration+0x59/0xa0
May 17 06:05:02 pcs kernel: [2788004.673328]  [<ffffffff810e5108>] cpuset_write_mem_migration_pending+0x98/0xd0
May 17 06:05:02 pcs kernel: [2788004.673332]  [<ffffffff810e5070>] ? cpuset_write_mem_migration_pending+0x0/0xd0
May 17 06:05:02 pcs kernel: [2788004.673336]  [<ffffffff810dd1af>] cgroup_file_write+0x16f/0x320
May 17 06:05:02 pcs kernel: [2788004.673339]  [<ffffffff811723ed>] ? do_mmap_pgoff+0x33d/0x3a0
May 17 06:05:02 pcs kernel: [2788004.673344]  [<ffffffff811ab658>] vfs_write+0xb8/0x1a0
May 17 06:05:02 pcs kernel: [2788004.673347]  [<ffffffff811abf51>] sys_write+0x51/0x90
May 17 06:05:02 pcs kernel: [2788004.673351]  [<ffffffff8100b102>] system_call_fastpath+0x16/0x1b

Cause

Management tools are stuck because numabalanced process acquired exclusive lock for too long.

This issue was submitted as a product bug with internal ID #PSBM-26897.

Resolution

This issue will be fixed in future updates of Parallels products.

The only immediate workaround is to reboot the hardware node.

Search Words

numabalanced

delete virtual environment

VE unmanageable

delete hangs

PSBM-26897

c62e8726973f80975db0531f1ed5c6a2 2897d76d56d2010f4e3a28f864d69223 0dd5b9380c7d4884d77587f3eb0fa8ef

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