Re: Random freezing failure with NFS and automount

["Rafael J. Wysocki" <rjw@sisk.pl>]

Hi,

On Tuesday, June 28, 2011, Vaidyanathan Srinivasan wrote:
> Hi,
> 
> I have random freezing failures on my laptop running 2.6.39 kernel.
> The laptop has NFS client and automount.  Network could have been
> disconnected by the time suspend is attempted, hence nfs client should
> fail all operations, just freeze and allow laptop to suspend.
> 
> I need some help to drill deeper at this log and also suggestions on
> config options to try and get more information to help me root cause
> this issue.
> 
> This happens once in 4-5 suspend/resume cycles, does not succeed on
> retry, eventually I have to reboot.

This is a tasks freezer failure, ie. the freezing of tasks fails, because
one of them refuses to handle signals for 20 s.  This is probably related
to waiting on a VFS mutex in the TASK_UNINTERRUPTIBLE state.

We don't handle those cases nicely right now, sorry about that.

Thanks,
Rafael


> Linux kernel version 2.6.39-2.slh.1-aptosid-amd64 (debian)
> 
> [15203.060847] PM: Syncing filesystems ... done.
> [15203.224792] Freezing user space processes ... 
> [15223.230516] Freezing of tasks failed after 20.00 seconds (1 tasks refusing to freeze, wq_busy=0):
> [15223.230551] man             T 0000000000000002     0  6788   6765 0x00800004
> [15223.230557]  ffff880037192760 0000000000000086 ffff88011823cc30 ffff88013328bb10
> [15223.230562]  ffff88010bd83fd8 ffff88010bd83fd8 ffff88010bd83fd8 ffff880037192760
> [15223.230567]  ffff8801332d5ac0 ffffffff8103cd7c ffff880037192760 ffff88012f8d5a88
> [15223.230571] Call Trace:
> [15223.230581]  [<ffffffff8103cd7c>] ? __wake_up_sync_key+0x4c/0x90
> [15223.230588]  [<ffffffff8105b4f9>] ? do_notify_parent_cldstop+0x149/0x1b0
> [15223.230596]  [<ffffffff810fb5c9>] ? kmem_cache_free+0x99/0xb0
> [15223.230600]  [<ffffffff8105b767>] ? do_signal_stop+0xa7/0x1e0
> [15223.230604]  [<ffffffff8105c74d>] ? get_signal_to_deliver+0xfd/0x3f0
> [15223.230609]  [<ffffffff8100a114>] ? do_signal+0x84/0x7e0
> [15223.230614]  [<ffffffff81033c28>] ? do_page_fault+0x198/0x440
> [15223.230619]  [<ffffffff8104fb38>] ? do_wait+0x1d8/0x210
> [15223.230623]  [<ffffffff81050dc5>] ? sys_wait4+0xa5/0x100
> [15223.230626]  [<ffffffff8100a8f5>] ? do_notify_resume+0x65/0x90
> [15223.230630]  [<ffffffff8104eab0>] ? delayed_put_task_struct+0x60/0x60
> [15223.230637]  [<ffffffff813b4c60>] ? int_signal+0x12/0x17
> [15223.230640] pager           T 0000000000000000     0  6799   6788 0x00800004
> [15223.230647]  ffff880037196900 0000000000000086 ffff880037025200 ffff880133326f90
> [15223.230649]  ffff88010487bfd8 ffff88010487bfd8 ffff88010487bfd8 ffff880037196900
> [15223.230651]  ffff8801303318c0 ffffffff8103cd7c ffff880037196900 ffff8801332d62c8
> [15223.230653] Call Trace:
> [15223.230655]  [<ffffffff8103cd7c>] ? __wake_up_sync_key+0x4c/0x90
> [15223.230657]  [<ffffffff8105b4f9>] ? do_notify_parent_cldstop+0x149/0x1b0
> [15223.230659]  [<ffffffff810400d8>] ? check_preempt_wakeup+0x118/0x160
> [15223.230661]  [<ffffffff810fb544>] ? kmem_cache_free+0x14/0xb0
> [15223.230663]  [<ffffffff8105b767>] ? do_signal_stop+0xa7/0x1e0
> [15223.230665]  [<ffffffff8105c74d>] ? get_signal_to_deliver+0xfd/0x3f0
> [15223.230667]  [<ffffffff8100a114>] ? do_signal+0x84/0x7e0
> [15223.230669]  [<ffffffff8105d312>] ? sys_kill+0x122/0x1d0
> [15223.230670]  [<ffffffff8100a8f5>] ? do_notify_resume+0x65/0x90
> [15223.230672]  [<ffffffff813b4c60>] ? int_signal+0x12/0x17
> [15223.230685] automount       D 0000000000000003     0 15394   2438 0x00800004
> [15223.230688]  ffff8800a0a83480 0000000000000082 0000000000000000 ffff8801183dc1a0
> [15223.230690]  ffff88009c4e3fd8 ffff88009c4e3fd8 ffff88009c4e3fd8 ffff8800a0a83480
> [15223.230692]  ffff88009c4e3ce0 ffff88010bf95001 ffff88009c4e3c5e ffffffff81113547
> [15223.230694] Call Trace:
> [15223.230697]  [<ffffffff81113547>] ? __follow_mount_rcu.isra.21+0x37/0xe0
> [15223.230703]  [<ffffffff812b3b89>] ? kernel_sendmsg+0x39/0x50
> [15223.230722]  [<ffffffffa059992a>] ? xs_send_kvec+0x8a/0x90 [sunrpc]
> [15223.230727]  [<ffffffffa059c3f0>] ? rpc_queue_empty+0x40/0x40 [sunrpc]
> [15223.230732]  [<ffffffffa059c40f>] ? rpc_wait_bit_killable+0x1f/0x40 [sunrpc]
> [15223.230734]  [<ffffffff813b253f>] ? __wait_on_bit+0x4f/0x80
> [15223.230738]  [<ffffffffa059c3f0>] ? rpc_queue_empty+0x40/0x40 [sunrpc]
> [15223.230740]  [<ffffffff813b25ec>] ? out_of_line_wait_on_bit+0x7c/0xa0
> [15223.230744]  [<ffffffff81068610>] ? autoremove_wake_function+0x30/0x30
> [15223.230748]  [<ffffffffa059d0d4>] ? __rpc_execute+0xe4/0x2f0 [sunrpc]
> [15223.230750]  [<ffffffff810682d8>] ? wake_up_bit+0x18/0x40
> [15223.230754]  [<ffffffffa0596299>] ? rpc_run_task+0x69/0x90 [sunrpc]
> [15223.230757]  [<ffffffffa05963cf>] ? rpc_call_sync+0x3f/0x70 [sunrpc]
> [15223.230765]  [<ffffffffa05f089c>] ? nfs3_rpc_wrapper.constprop.15+0x3c/0x60 [nfs]
> [15223.230770]  [<ffffffffa05f1c13>] ? nfs3_proc_getattr+0x43/0x90 [nfs]
> [15223.230775]  [<ffffffffa05e0d94>] ? __nfs_revalidate_inode+0x94/0x200 [nfs]
> [15223.230780]  [<ffffffffa05e1107>] ? nfs_getattr+0x57/0x110 [nfs]
> [15223.230782]  [<ffffffff8110c432>] ? vfs_fstatat+0x52/0x70
> [15223.230784]  [<ffffffff8110c5c2>] ? sys_newlstat+0x12/0x30
> [15223.230787]  [<ffffffff81125026>] ? mntput_no_expire+0x16/0xf0
> [15223.230790]  [<ffffffff8110625f>] ? filp_close+0x5f/0x90
> [15223.230791]  [<ffffffff8110633d>] ? sys_close+0xad/0x120
> [15223.230793]  [<ffffffff813b4992>] ? system_call_fastpath+0x16/0x1b
> [15223.230796] 
> [15223.230797] Restarting tasks ... done.
> 
> Thanks,
> Vaidy
> 
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