Date: Sat, 6 Dec 2008 16:53:17 +0100
From: Folkert van Heusden <folkert@vanheusden.com>
To: Randolf Pohl <randolf.pohl@gmx.de>
Subject: Re: [2.6.27] filesystem (ext3) corruption (access beyond end)
Message-ID: <20081206155317.GL30807@vanheusden.com>
References: <20081205094639.8800@gmx.net>
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Ok I ran several disk-intensive jobs (git clone, kernel build, apt-get dist-upgrade)
but none of those could trigger any bugs.
BUT, running my http://vanheusden.com/pyk/ script, I definately can trigger the
problem:
[85202.195563] rtc0: alarms up to one month, y3k, hpet irqs
[85204.035802] journal_bmap: journal block not found at offset 2060 on dm-0
[85204.035818] Aborting journal on device dm-0.
[85311.242093] ext3_abort called.
[85311.242120] EXT3-fs error (device dm-0): ext3_journal_start_sb: Detected aborted journal
[85311.242154] Remounting filesystem read-only
[86331.285847] EXT3-fs error (device dm-0): htree_dirblock_to_tree: bad entry in directory #24568: rec_len % 4 != 0 - offset=0, inode=4098364138, rec_len=59542, name_len=76
[89931.353863] EXT3-fs error (device dm-0): htree_dirblock_to_tree: bad entry in directory #24568: rec_len % 4 != 0 - offset=0, inode=4098364138, rec_len=59542, name_len=76

[92499.263276] attempt to access beyond end of device
[92499.263296] dm-2: rw=17, want=4177066240, limit=6004736
[92499.263311] Buffer I/O error on device dm-2, logical block 522133279
[92499.263333] lost page write due to I/O error on dm-2
[92499.263341] Aborting journal on device dm-2.
[92499.263504] ext3_abort called.
[92499.263515] EXT3-fs error (device dm-2): ext3_journal_start_sb: Detected aborted journal
[92499.263543] Remounting filesystem read-only

[93531.419902] EXT3-fs error (device dm-0): htree_dirblock_to_tree: bad entry in directory #24568: rec_len % 4 != 0 - offset=0, inode=4098364138, rec_len=59542, name_len=76

Very odd since the script only rmmod/insmods modules and trying to
rmmod for example ext3-module shouldn';t be a problem since it is
in use.

On Fri, Dec 05, 2008 at 10:46:39AM +0100, Randolf Pohl wrote:
> I think, stable and gregkh should be CCed on this,
> and yes, I guess this deserves some investigation.
> 
> Regards,
> 
> Randolf
> 
> http://lkml.org/lkml/2008/12/4/246
> 
> Folkert van Heusden wrote:
> 
> > Hi,
> > 
> > With 2.6.26 and 2.6.27 a system of mine (a P4 with HT and IDE disk)
> > gets massive disk-corruption: in dmesg warnings for access beyond
> > drive end.
> > Now this bug did not happen in 2.6.18 (debian kernel) and it seems to
> > be gone in 2.6.28-rc* as well.
> > My question now is: should it still be investigated?
> >
> >
> > Folkert van Heusden
> -- 
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Folkert van Heusden

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