From: Johannes Berg <johannes@sipsolutions.net>
To: Dave Young <hidave.darkstar@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [2.6.33-rc5] Weird deadlock when shutting down
Date: Sat, 20 Feb 2010 09:46:47 +0100 [thread overview]
Message-ID: <1266655607.3790.2.camel@jlt3.sipsolutions.net> (raw)
In-Reply-To: <a8e1da1002192342x7ca67176ta285db35ec6d34a6@mail.gmail.com>
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On Sat, 2010-02-20 at 15:42 +0800, Dave Young wrote:
> > Well, it used to not deadlock and actually shut down the machine :)
> So
> > in that sense it's definitely new. It might have printed a lockdep
> > warning before, which you wouldn't normally see since the machine
> turns
> > off right after this.
>
> before shutdown, you can:
> echo N > /proc/sys/kernel/printk_delay
> to see the printk messages, N is 0-10000 in milliseconds
Well if I understand Américo correctly then it won't have printed
anything (even if it were to deadlock) before adding the lockdep
annotations to s_active, so I guess that theory is out.
johannes
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next prev parent reply other threads:[~2010-02-20 8:46 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-29 4:41 [2.6.33-rc5] Weird deadlock when shutting down Benjamin Herrenschmidt
2010-02-18 9:36 ` Johannes Berg
2010-02-18 16:31 ` Linus Torvalds
2010-02-18 18:45 ` Johannes Berg
2010-02-20 7:13 ` Américo Wang
2010-02-20 8:56 ` Johannes Berg
2010-02-20 9:06 ` Américo Wang
2010-02-20 10:53 ` Johannes Berg
2010-02-20 11:28 ` Johannes Berg
2010-02-20 12:07 ` Johannes Berg
2010-02-20 13:44 ` Américo Wang
2010-02-20 13:57 ` Johannes Berg
2010-02-21 9:51 ` Américo Wang
2010-02-21 10:17 ` Johannes Berg
2010-02-22 8:19 ` Américo Wang
2010-02-22 8:39 ` Johannes Berg
2010-02-21 10:43 ` Johannes Berg
2010-02-21 10:55 ` Xiaotian Feng
2010-02-21 11:12 ` Xiaotian Feng
2010-02-21 11:14 ` Johannes Berg
2010-02-21 11:22 ` Johannes Berg
2010-02-22 8:34 ` Américo Wang
2010-02-22 9:04 ` Johannes Berg
2010-02-22 9:12 ` Américo Wang
2010-02-22 9:14 ` Johannes Berg
2010-02-22 9:21 ` Américo Wang
2010-02-22 8:22 ` Américo Wang
2010-02-20 7:42 ` Dave Young
2010-02-20 8:46 ` Johannes Berg [this message]
2010-02-20 4:46 ` Américo Wang
2010-02-20 8:45 ` Johannes Berg
2010-02-20 9:30 ` Américo Wang
2010-02-20 10:52 ` Johannes Berg
2010-03-25 11:28 ` David Howells
2010-03-26 2:43 ` Américo Wang
2010-03-26 12:22 ` David Howells
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