Article ID: 111896, created on Aug 15, 2011, last review on May 9, 2014

  • Applies to:
  • Virtuozzo containers for Linux 4.6
  • Virtuozzo containers for Linux 4.0

Symptoms

Sometimes Parallels Containers is unable to restore delayed mounts of the network filesystems such as CIFS or NFS. Such failures can be tracked down in the /var/log/messages as below:

[ 1024.381688] DFS302: resuming daemon started
[ 1243.090701] INFO: task file_read:2511 blocked for more than 120 seconds.
[ 1243.090944] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1243.091160] file_read D ffff88000e96e040 0 2511 2510 0x00000080
[ 1243.091707] ffff88000be87d18 0000000000000082 ffff880015b01c00 00007f5e62f804e0
[ 1243.091985] 0000000000000008 00000000000000d4 00007f5e62f80000 ffffea000055ce00
[ 1243.092185] ffff88000e96e620 ffff88000be87fd8 000000000000f748 ffff88000e96e620
[ 1243.092532] Call Trace:
[ 1243.092845] [<ffffffff814bed95>] rwsem_down_failed_common+0x95/0x1d0
[ 1243.093079] [<ffffffff81058d20>] ? default_wake_function+0x0/0x20
[ 1243.093232] [<ffffffff814beef3>] rwsem_down_write_failed+0x23/0x30
[ 1243.093647] [<ffffffff812585b3>] call_rwsem_down_write_failed+0x13/0x20
[ 1243.093900] [<ffffffff814be3f2>] ? down_write+0x32/0x40
[ 1243.094049] [<ffffffffa04a88d2>] delay_switch_mm+0x22/0xd0 [vzrst]
[ 1243.094206] [<ffffffffa04a89d2>] delay_switch_current+0x52/0x60 [vzrst]
[ 1243.094389] [<ffffffffa04a8a71>] delayfs_wait_file+0x91/0x2c0 [vzrst]
[ 1243.094533] [<ffffffff814bdd1e>] ? mutex_lock+0x1e/0x50
[ 1243.094960] [<ffffffffa04a8d9e>] delay_llseek+0xe/0x20 [vzrst]
[ 1243.095113] [<ffffffff8117d19a>] vfs_llseek+0x3a/0x40
[ 1243.095242] [<ffffffff8117e926>] sys_lseek+0x66/0x80
[ 1243.095372] [<ffffffff8100b242>] system_call_fastpath+0x16/0x1b
[ 1243.095781] INFO: task file_read:2512 blocked for more than 120 seconds.
[ 1243.095991] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1243.096184] file_read D ffff88000be88bc0 0 2512 2510 0x00000080
[ 1243.096363] ffff88000be8bd18 0000000000000086 ffff880015b03c00 00007f5e62f804e0
[ 1243.096859] ffff880000000008 00000000000000d4 00007f5e62f80000 ffffea000055ce00
[ 1243.097071] ffff88000be891a0 ffff88000be8bfd8 000000000000f748 ffff88000be891a0
[ 1243.097273] Call Trace:
[ 1243.097340] [<ffffffff814bed95>] rwsem_down_failed_common+0x95/0x1d0
[ 1243.097543] [<ffffffff81058d20>] ? default_wake_function+0x0/0x20
[ 1243.097946] [<ffffffff814beef3>] rwsem_down_write_failed+0x23/0x30
[ 1243.098102] [<ffffffff812585b3>] call_rwsem_down_write_failed+0x13/0x20
[ 1243.098268] [<ffffffff814be3f2>] ? down_write+0x32/0x40
[ 1243.098406] [<ffffffffa04a88d2>] delay_switch_mm+0x22/0xd0 [vzrst]
[ 1243.098889] [<ffffffffa04a89d2>] delay_switch_current+0x52/0x60 [vzrst]
[ 1243.099065] [<ffffffffa04a8a71>] delayfs_wait_file+0x91/0x2c0 [vzrst]
[ 1243.099229] [<ffffffff814bdd1e>] ? mutex_lock+0x1e/0x50
[ 1243.099475] [<ffffffffa04a8d9e>] delay_llseek+0xe/0x20 [vzrst]
[ 1243.099627] [<ffffffff8117d19a>] vfs_llseek+0x3a/0x40
[ 1243.099923] [<ffffffff8117e926>] sys_lseek+0x66/0x80
[ 1243.100078] [<ffffffff8100b242>] system_call_fastpath+0x16/0x1b

Resolution

Corresponding bug has been fixed in the Parallels Containers version 4.7, please consider updating onto this version for resolution.

36627b12981f68a16405a79233409a5e d02f9caf3e11b191a38179103495106f e8e50b42231236b82df27684e7ec0beb 35c16f1fded8e42577cb3df16429c57a 2897d76d56d2010f4e3a28f864d69223

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