Re: frequent softlockups with 3.10rc6.

From: Oleg Nesterov
Date: Sun Jun 23 2013 - 10:41:29 EST

On 06/22, Dave Jones wrote:
> On Sat, Jun 22, 2013 at 07:31:29PM +0200, Oleg Nesterov wrote:
> > > [ 7485.261299] WARNING: at include/linux/nsproxy.h:63 get_proc_task_net+0x1c8/0x1d0()
> >
> > Hmm. The test case tries to create the symlink in /proc/*/net/ ?
> hit it with symlink, but also some other syscalls. eg:

Yes, this is fine, the warnings without lockup are not interesting.
I thought that, perhaps, an exiting task can trigger this WARN()
from task_work_run(). And this would be fine too! But this could
provide more info if lockup happens after that. So please ignore.

> > But it seems you can't ?
> >
> > Dave, I am sorry but all I can do is to ask you to do more testing.
> > Could you please reproduce the lockup again on the clean Linus's
> > current ? (and _without_ reverting 8aac6270, of course).
> I'll give it a shot. Just rebuilt clean tree, and restarted the tests.

Thanks a lot.


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