On Mon, Oct 20, 2014 at 02:15:15PM -0600, Kevin Fenzi wrote:
> I'm seeing suspend/resume failures with recent 3.18 git kernels.
>
> Full dmesg at: http://paste.fedoraproject.org/143615/83287914/
>
> The possibly interesting parts:
>
> [ 78.373144] PM: Syncing filesystems ... done.
> [ 78.411180] PM: Preparing system for mem sleep
> [ 78.411995] Freezing user space processes ...
> [ 98.429955] Freezing of tasks failed after 20.001 seconds (1 tasks
> refusing to freeze, wq_busy=0):
> [ 98.429971] (-localed) D ffff88025f214c80 0 1866 1
> 0x00000084
> [ 98.429975] ffff88024e777df8 0000000000000086 ffff88009b4444b0
> 0000000000014c80
> [ 98.429978] ffff88024e777fd8 0000000000014c80 ffff880250ffb110
> ffff88009b4444b0
> [ 98.429981] 0000000000000000 ffffffff81cec1a0 ffffffff81cec1a4
> ffff88009b4444b0
> [ 98.429983] Call Trace:
> [ 98.429991] [<ffffffff8175d619>] schedule_preempt_disabled+0x29/0x70
> [ 98.429994] [<ffffffff8175f433>] __mutex_lock_slowpath+0xb3/0x120
> [ 98.429997] [<ffffffff8175f4c3>] mutex_lock+0x23/0x40
> [ 98.430001] [<ffffffff8163e325>] copy_net_ns+0x75/0x140
> [ 98.430005] [<ffffffff810b8c2d>] create_new_namespaces+0xfd/0x1a0
> [ 98.430008] [<ffffffff810b8e5a>] unshare_nsproxy_namespaces+0x5a/0xc0
> [ 98.430012] [<ffffffff81098813>] SyS_unshare+0x193/0x340
> [ 98.430015] [<ffffffff817617a9>] system_call_fastpath+0x12/0x17
I've seen similar soft lockup traces from the sys_unshare path when running my
fuzz tester. It seems that if you create enough network namespaces,
it can take a huge amount of time for them to be iterated.
(Running trinity with '-c unshare' you can see the slow down happen. In
some cases, it takes so long that the watchdog process kills it --
though the SIGKILL won't get delivered until the unshare() completes)
Any idea what this machine had been doing prior to this that may have
involved creating lots of namespaces ?
Dave
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