linux-kernel - Re: frequent softlockups with 3.10rc6.

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Message-ID: <20130623143634.GA2000@redhat.com>
Date:	Sun, 23 Jun 2013 16:36:34 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Dave Jones <davej@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrey Vagin <avagin@...nvz.org>
Subject: Re: frequent softlockups with 3.10rc6.

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.

Oleg.

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