linux-kernel - Re: lockups shortly after booting in current git.

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Date:	Thu, 29 Mar 2012 15:53:54 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: lockups shortly after booting in current git.

On Thu, Mar 29, 2012 at 11:36:49AM -0700, Linus Torvalds wrote:
 > On Thu, Mar 29, 2012 at 11:26 AM, Dave Jones <davej@...hat.com> wrote:
 > > On Thu, Mar 29, 2012 at 09:03:31AM -0700, Linus Torvalds wrote:
 > >  > Can you do sysrq-w (or whatever it is that does only the D-state
 > >  > processes)? That might give the more relevant process information without
 > >  > everything else making it unreadable...
 > >
 > > http://codemonkey.org.uk/junk/process-trace2.txt
 > 
 > Ok, this doesn't look all that different, but now it's not truncated
 > any more because the random "waits for children or poll" cases are
 > gone.
 > 
 > It's still basically all blocked on the ext4 journal. All writes as
 > far as I can see.
 > 
 > That said, there's that odd kworker/1:2 there that seems to be
 > constantly running. Can you get the EIP for that one (several times)
 > by doing sysrq-p (or maybe sysrq-l is better - that should give the
 > stack trace too).

Took a while to reproduce that time (but now I have a theory, going
to try and reproduce that after sending this mail).

sysrq-p looks kinda boring. I couldn't get sysrq-l to coincide
with kworker running.

http://codemonkey.org.uk/junk/process-trace3.txt

	Dave

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