linux-kernel - Re: 3.5-rc6 printk formatting problem during oom-kill.

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Date:	Thu, 12 Jul 2012 10:05:52 -0400
From:	Dave Jones <davej@...hat.com>
To:	Kay Sievers <kay@...y.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartmann <greg@...ah.com>
Subject: Re: 3.5-rc6 printk formatting problem during oom-kill.

On Thu, Jul 12, 2012 at 03:52:17PM +0200, Kay Sievers wrote:
 > On Thu, Jul 12, 2012 at 2:54 AM, Dave Jones <davej@...hat.com> wrote:
 > > On Mon, Jul 09, 2012 at 08:48:51PM +0200, Kay Sievers wrote:
 > 
 > >  > It looks fine here with the above mentioned patch:
 > >
 > > Now that that patch is in Linus tree, I've hit what's probably a different case.
 > > Look at the modules list in this oops..
 > >
 > > [10016.460020] BUG: soft lockup - CPU#1 stuck for 22s! [trinity-child1:24295]
 > > [10016.470008]  rose<4>[10016.470008]  ip_set_bitmap_ipmac<4>[10016.470008]
 > 
 > > Also, I have no idea how the hell the 'Modules linked in:' line (9th line) ended up being printed /after/ the
 > > module listing began (2nd line).
 > 
 > It's the output of 'dmesg' you pasted, right?

Yes.

 > I tried to force all sorts of racy print_modules() calls, and kept
 > your trinity tool from git for hours, it looks all fine here:
 > 
 > Can you easily reproduce the issue you pasted?  If, could you give me
 > the /dev/kmsg output?

I've seen it a few times, always with the soft lockup trace.

You might be able to trigger it using scripts/load-all-modules.sh
from trinity.git. (Assuming you have a lot of modules built, I'm
still trying to track down which one seems to be responsible).

	Dave

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