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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1166481878.5044.4.camel@nigel.suspend2.net>
Date:	Tue, 19 Dec 2006 09:44:38 +1100
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jiri Slaby <jirislaby@...il.com>, 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)

Hi.

On Mon, 2006-12-18 at 23:38 +0100, Rafael J. Wysocki wrote:
> 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?

I have a patch in -mm that reduces lru_pages by what shrink_all_zones
returns. Could shrink_all_zones perhaps be returning incorrect values
such that lru_pages ends up becoming -1?

Regards,

Nigel

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/