linux-kernel - [PATCH 0/1] Was: Processes hang in an unkillable state

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Message-ID: <20110412190731.GA13752@redhat.com>
Date:	Tue, 12 Apr 2011 21:07:31 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Américo Wang <xiyou.wangcong@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>
Cc:	Robert Święcki <robert@...ecki.net>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/1] Was: Processes hang in an unkillable state

(add cc's)

On 04/12, Oleg Nesterov wrote:
>
> On 04/12, Américo Wang wrote:
> >
> > Hmm, it must be stuck at
> >
> > lib/rwsem.c
> >
> >         /* wait to be given the lock */
> >         for (;;) {
> >                 if (!waiter.task)
> >                         break;
> >                 schedule();
> >                 set_task_state(tsk, TASK_UNINTERRUPTIBLE);
> >         }
> >
> > don't know why it still can't acquire the ->mmap_sem...
> >
> > Cc'ing Oleg...
>
> I seem to understand...
>
> Please wait a bit, I need to recheck.

Yes, mlock looks buggy. I'll report more info a bit later, but
I think we need something like this patch.

Oleg.

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