Re: kernel BUG at mm/vmscan.c:1114

[Mel Gorman <mgorman@suse.de>]

On Fri, Aug 05, 2011 at 08:30:44PM +0800, Xiaotian Feng wrote:
> On Fri, Aug 5, 2011 at 8:09 PM, Xiaotian Feng <xtfeng@gmail.com> wrote:
> > On Fri, Aug 5, 2011 at 5:19 PM, Mel Gorman <mgorman@suse.de> wrote:
> >> (Adding patch author to cc)
> >>
> >> On Fri, Aug 05, 2011 at 04:42:43PM +0800, Xiaotian Feng wrote:
> >>> On Thu, Aug 4, 2011 at 11:54 AM, Xiaotian Feng <xtfeng@gmail.com> wrote:
> >>> > On Wed, Aug 3, 2011 at 4:54 PM, Mel Gorman <mgorman@suse.de> wrote:
> >>> >> On Wed, Aug 03, 2011 at 02:44:20PM +0800, Xiaotian Feng wrote:
> >>> >>> On Tue, Aug 2, 2011 at 3:22 PM, Andrew Morton <akpm@linux-foundation.org> wrote:
> >>> >>> > On Tue, 2 Aug 2011 15:09:57 +0800 Xiaotian Feng <xtfeng@gmail.com> wrote:
> >>> >>> >
> >>> >>> >> __ __I'm hitting the kernel BUG at mm/vmscan.c:1114 twice, each time I
> >>> >>> >> was trying to build my kernel. The photo of crash screen and my config
> >>> >>> >> is attached.
> >>> >>> >
> >>> >>> > hm, now why has that started happening?
> >>> >>> >
> >>> >>> > Perhaps you could apply this debug patch, see if we can narrow it down?
> >>> >>> >
> >>> >>>
> >>> >>> I will try it then, but it isn't very reproducible :(
> >>> >>> But my system hung after some list corruption warnings... I hit the
> >>> >>> corruption 4 times...
> >>> >>>
> >>> >>
> >>> >> That is very unexpected but if lists are being corrupted, it could
> >>> >> explain the previously reported bug as that bug looked like an active
> >>> >> page on an inactive list.
> >>> >>
> >>> >> What was the last working kernel? Can you bisect?
> >>> >>
> >>> >>>  [ 1220.468089] ------------[ cut here ]------------
> >>> >>>  [ 1220.468099] WARNING: at lib/list_debug.c:56 __list_del_entry+0x82/0xd0()
> >>> >>>  [ 1220.468102] Hardware name: 42424XC
> >>> >>>  [ 1220.468104] list_del corruption. next->prev should be
> >>> >>> ffffea0000e069a0, but was ffff880100216c78
> >>> >>>  [ 1220.468106] Modules linked in: ip6table_filter ip6_tables
> >>> >>> ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
> >>> >>> xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp
> >>> >>> iptable_filter ip_tables x_tables binfmt_misc bridge stp parport_pc
> >>> >>> ppdev snd_hda_codec_conexant snd_hda_intel snd_hda_codec thinkpad_acpi
> >>> >>> snd_hwdep snd_pcm i915 snd_seq_midi snd_rawmidi arc4 cryptd
> >>> >>> snd_seq_midi_event aes_x86_64 snd_seq drm_kms_helper iwlagn snd_timer
> >>> >>> aes_generic drm snd_seq_device mac80211 psmouse uvcvideo videodev snd
> >>> >>> v4l2_compat_ioctl32 soundcore snd_page_alloc serio_raw i2c_algo_bit
> >>> >>> btusb tpm_tis tpm tpm_bios video cfg80211 bluetooth nvram lp joydev
> >>> >>> parport usbhid hid ahci libahci firewire_ohci firewire_core e1000e
> >>> >>> sdhci_pci sdhci crc_itu_t
> >>> >>>  [ 1220.468185] Pid: 1168, comm: Xorg Tainted: G        W   3.0.0+ #23
> >>> >>>  [ 1220.468188] Call Trace:
> >>> >>>  [ 1220.468190]  <IRQ>  [<ffffffff8106db3f>] warn_slowpath_common+0x7f/0xc0
> >>> >>>  [ 1220.468201]  [<ffffffff8106dc36>] warn_slowpath_fmt+0x46/0x50
> >>> >>>  [ 1220.468206]  [<ffffffff81332a52>] __list_del_entry+0x82/0xd0
> >>> >>>  [ 1220.468210]  [<ffffffff81332ab1>] list_del+0x11/0x40
> >>> >>>  [ 1220.468216]  [<ffffffff8117a212>] __slab_free+0x362/0x3d0
> >>> >>>  [ 1220.468222]  [<ffffffff811c6606>] ? bvec_free_bs+0x26/0x40
> >>> >>>  [ 1220.468226]  [<ffffffff8117b767>] ? kmem_cache_free+0x97/0x220
> >>> >>>  [ 1220.468230]  [<ffffffff811c6606>] ? bvec_free_bs+0x26/0x40
> >>> >>>  [ 1220.468234]  [<ffffffff811c6606>] ? bvec_free_bs+0x26/0x40
> >>> >>>  [ 1220.468239]  [<ffffffff8117b8df>] kmem_cache_free+0x20f/0x220
> >>> >>>  [ 1220.468243]  [<ffffffff811c6606>] bvec_free_bs+0x26/0x40
> >>> >>>  [ 1220.468247]  [<ffffffff811c6654>] bio_free+0x34/0x70
> >>> >>>  [ 1220.468250]  [<ffffffff811c66a5>] bio_fs_de
> >>> >>>
> >>> >>
> >>> >
> >>> > I'm hitting this again today, when I'm trying to rebuild my kernel....
> >>> > Looking it a bit
> >>> >
> >>> >  list_del corruption. next->prev should be ffffea0000e069a0, but was
> >>> > ffff880100216c78
> >>> >
> >>> > I find something interesting from my syslog:
> >>> >
> >>> >  PERCPU: Embedded 28 pages/cpu @ffff880100200000 s83456 r8192 d23040 u262144
> >>> >
> >>> >> This warning and the page reclaim warning are on paths that are
> >>> >> commonly used and I would expect to see multiple reports. I wonder
> >>> >> what is happening on your machine that is so unusual.
> >>> >>
> >>> >> Have you run memtest on this machine for a few hours and badblocks
> >>> >> on the disk to ensure this is not hardware trouble?
> >>> >>
> >>> >>> So is it possible that my previous BUG is triggered by slab list corruption?
> >>> >>
> >>> >> Not directly, but clearly there is something very wrong.
> >>> >>
> >>> >> If slub corruption reports are very common and kernel 3.0 is fine, my
> >>> >> strongest candidate for the corruption would be the SLUB lockless
> >>> >> patches. Try
> >>> >>
> >>> >> git diff e4a46182e1bcc2ddacff5a35f6b52398b51f1b11..9e577e8b46ab0c38970c0f0cd7eae62e6dffddee | patch -p1 -R
> >>> >>
> >>> >
> >>>
> >>> Here's a update for the results:
> >>>
> >>> 3.0.0-rc7: running for hours without a crash
> >>> upstream kernel: list corruption happened while building kernel within
> >>> 10 mins (I'm running some app chrome/firefox/thunderbird/... as well)
> >>> upstream kernel with above revert: running for hours without a crash
> >>>
> >>> Trying to bisect but rebuild is slow ....
> >>>
> >>
> >> If you have not done so already, I strongly suggest your bisection
> >> starts within that range of patches to isolate which one is at fault.
> >> It'll cut down on the number of builds you need to do. Thanks for
> >> testing.
> >>
> >
> > This is interesting, I just change as following:
> >
> > diff --git a/mm/slub.c b/mm/slub.c
> > index eb5a8f9..616b78e 100644
> > --- a/mm/slub.c
> > +++ b/mm/slub.c
> > @@ -2104,8 +2104,9 @@ static void *__slab_alloc(struct kmem_cache *s,
> > gfp_t gfpflags, int node,
> >                        "__slab_alloc"));
> >
> >        if (unlikely(!object)) {
> > -               c->page = NULL;
> > +               //c->page = NULL;
> >                stat(s, DEACTIVATE_BYPASS);
> > +               deactivate_slab(s, c);
> >                goto new_slab;
> >        }
> >
> > Then my system doesn't print any list corruption warnings and my build
> > success then. So this means revert of 03e404af2 could cure this.
> > I'll do more test next week to see if the list corruption still exist, thanks.
> >
> 
> Sorry, please ignore it... My system corrupted before I went to leave ....
> 

Please continue the bisection in that case and establish for sure if the
problem is in that series or not. Thanks.

-- 
Mel Gorman
SUSE Labs

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