linux-kernel - Re: [linux-pm] OOPS: divide error while s2dsk (2.6.20-rc1-mm1)

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Date:	Mon, 18 Dec 2006 23:38:23 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	linux-pm@...ts.osdl.org,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	akpm@...l.org, linux-pm@...l.org
Subject: Re: [linux-pm] OOPS: divide error while s2dsk (2.6.20-rc1-mm1)

On Monday, 18 December 2006 18:02, Jiri Slaby wrote:
> Rafael J. Wysocki wrote:
> > Hi,
> > 
> > On Monday, 18 December 2006 12:20, Jiri Slaby wrote:
> >> Hi.
> >>
> >> I got this oops while suspending:
> >> [  309.366557] Disabling non-boot CPUs ...
> >> [  309.386563] CPU 1 is now offline
> >> [  309.387625] CPU1 is down
> >> [  309.387704] Stopping tasks ... done.
> >> [  310.030991] Shrinking memory... -<0>divide error: 0000 [#1]
> >> [  310.456669] SMP
> >> [  310.456814] last sysfs file:
> >> /devices/pci0000:00/0000:00:1e.0/0000:02:08.0/eth0/statistics/collisions
> >> [  310.456919] Modules linked in: eth1394 floppy ohci1394 ide_cd ieee1394 cdrom
> >> [  310.457259] CPU:    0
> >> [  310.457260] EIP:    0060:[<c0150c9a>]    Not tainted VLI
> >> [  310.457261] EFLAGS: 00210246   (2.6.20-rc1-mm1 #207)
> >> [  310.457478] EIP is at shrink_slab+0x9e/0x169
> > 
> > Looks like we have a problem with slab shrinking here.
> > 
> > Could you please use gdb to check what exactly is at shrink_slab+0x9e?
> 
> Sure, but not till Friday, sorry (I am away).

I reproduced this on one box, but then it turned out that EIP was at line 195
of mm/vmscan.c where there was

do_div(delta, lru_pages + 1);

Well, I have no idea how this can lead to a divide error (lru_pages is
unsigned).

I'm unable to reproduce this on another i386 box, so it seems to be somewhat
configuration specific.

Does 2.6.20-rc1 work for you?

Rafael


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