Re: list corruption in the last few days. (block ? crypto ?)

From: Pekka Enberg
Date: Mon Aug 08 2011 - 02:18:47 EST


On Mon, Aug 8, 2011 at 9:14 AM, Xiaotian Feng <xtfeng@xxxxxxxxx> wrote:
> On Mon, Aug 8, 2011 at 1:18 PM, Pekka Enberg <penberg@xxxxxxxxxx> wrote:
>> Hi Linus,
>>
>> On Sun, Aug 7, 2011 at 11:58 AM, Pekka Enberg <penberg@xxxxxxxxxx> wrote:
>>>>
>>>> Christoph, I've been reading the code and spotted two potential issues in
>>>> __slab_free(). The first one seems like an off-by-one where our
>>>> comparison
>>>> in deactivate_slab() doesn't match __slab_free.
>>>>
>>>> The other one is remove_full() call in __slab_free() that can get called
>>>> even if cache debugging is not enabled.
>>>>
>>>> Hmm?
>>
>> On Sun, 7 Aug 2011, Linus Torvalds wrote:
>>>
>>> I'd like to do -rc1 today, regardless of whether this fixes things or
>>> not (-rc1 is already a few days delayed).
>>>
>>> The patch seems to be a good fix, and a likely candidate for the
>>> corruption. Commit log and sign-off? I assume you've given it some
>>> testing, even if you couldn't reproduce the original issue?
>>
>> No, I haven't tested the patch myself but here's one in proper format in
>> case someone wants to test it.
>
> I applied it and I'm still seeing the corruption warning start from this :(
>
>  [ 3674.255030] ------------[ cut here ]------------
>  [ 3674.255040] WARNING: at lib/list_debug.c:53 __list_del_entry+0xa1/0xd0()
>  [ 3674.255042] Hardware name: 42424XC
>  [ 3674.255045] list_del corruption. prev->next should be
> ffffea0000493420, but was ffffea0001ab0520
>  [ 3674.255047] 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 snd_hwdep
> snd_pcm thinkpad_acpi arc4 cryptd aes_x86_64 aes_generic snd_seq_midi
> i915 snd_rawmidi snd_seq_midi_event snd_seq joydev iwlagn btusb
> snd_timer snd_seq_device drm_kms_helper bluetooth uvcvideo snd
> videodev drm mac80211 cfg80211 i2c_algo_bit soundcore tpm_tis tpm
> tpm_bios lp snd_page_alloc psmouse serio_raw v4l2_compat_ioctl32 nvram
> video parport usbhid hid sdhci_pci firewire_ohci ahci libahci sdhci
> firewire_core crc_itu_t e1000e
>  [ 3674.255129] Pid: 3, comm: ksoftirqd/0 Not tainted 3.1.0-rc1+ #38
>  [ 3674.255131] Call Trace:
>  [ 3674.255138]  [<ffffffff8106db3f>] warn_slowpath_common+0x7f/0xc0
>  [ 3674.255143]  [<ffffffff8106dc36>] warn_slowpath_fmt+0x46/0x50
>  [ 3674.255147]  [<ffffffff81331851>] __list_del_entry+0xa1/0xd0
>  [ 3674.255151]  [<ffffffff81331891>] list_del+0x11/0x40
>  [ 3674.255156]  [<ffffffff81179631>] __slab_free+0x3d1/0x3e0
>  [ 3674.255162]  [<ffffffff811c5b06>] ? bvec_free_bs+0x26/0x40
>  [ 3674.255166]  [<ffffffff8117ab27>] ? kmem_cache_free+0x97/0x220
>  [ 3674.255170]  [<ffffffff811c5b06>] ? bvec_free_bs+0x26/0x40
>  [ 3674.255174]  [<ffffffff811c5b06>] ? bvec_free_bs+0x26/0x40
>  [ 3674.255179]  [<ffffffff8117ac9f>] kmem_cache_free+0x20f/0x220

Can you please also run

addr2line -e vmlinux
0xffffffff81179631

so that we know whether the corruption happens in the full list or the
partial list.

Pekka
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