| 2008-03-30 19:11:55 |
sam tygier |
bug |
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added bug |
| 2008-04-04 22:50:50 |
Leann Ogasawara |
linux: status |
New |
Incomplete |
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| 2009-01-17 00:18:11 |
Leann Ogasawara |
linux: status |
Incomplete |
Won't Fix |
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| 2009-01-17 00:18:11 |
Leann Ogasawara |
linux: statusexplanation |
Hi Sam,
Just curious if you are able to consistently reproduce this issue or if it was a random occurrence? Also care to comment which specific version of the kernel you were using (cat /proc/version_signature)? I know 2.6.24-15 was recently released. Thanks. |
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| 2009-03-17 06:07:54 |
Fumihito YOSHIDA |
linux: status |
Won't Fix |
New |
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| 2009-03-17 06:07:54 |
Fumihito YOSHIDA |
linux: statusexplanation |
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Hi, I found this related information at Red Hat EL 4.8's RHSA-2009:0331-14.
The problem caused by race conditions, It is not hardware trouble.
I could not reproduce yet, but source code said "problem stills in Jaunty"(maybe).
Jaunty's linux/fs/buffer.c::void unlock_buffer is :
{
clear_bit_unlock(BH_Lock, &bh->b_state);
smp_mb__after_clear_bit();
wake_up_bit(&bh->b_state, BH_Lock);
Information from Red Hat:
* http://rhn.redhat.com/errata/RHSA-2009-0331.html
* => https://bugzilla.redhat.com/show_bug.cgi?id=476533 (published info, link from RHSA-2009:0331-14)
* => https://bugzilla.redhat.com/show_bug.cgi?id=460179 (this is Red Hat's private)
* Red Hat's patchname:linux-2.6.9-fs-fix-it-already-cleared-for-block-errors.patch
linux/fs/buffer.c::void unlock_buffer is :
{
+ smp_mb__before_clear_bit();
clear_bit_unlock(BH_Lock, &bh->b_state);
smp_mb__after_clear_bit();
wake_up_bit(&bh->b_state, BH_Lock);
They said,
> a misplaced memory barrier at unlock_buffer() could lead to a concurrent
> h_refcounter update which produced a reference counter leak and, later, a
> double free in ext3_xattr_release_block(). Consequent to the double free,
> ext3 reported an error
>
> ext3_free_blocks_sb: bit already cleared for block [block number]
>
> and mounted itself as read-only. With this update, the memory barrier is
> now placed before the buffer head lock bit, forcing the write order and
> preventing the double free. (BZ#476533)
// I cant understand that why Red Hat does not distribute this info....
Related info are:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=497562
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| 2009-03-17 06:10:13 |
Fumihito YOSHIDA |
bug |
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assigned to linux-2.6 (Debian) |
| 2009-03-17 06:25:31 |
Bug Watch Updater |
linux-2.6: status |
Unknown |
New |
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| 2009-05-04 13:10:56 |
Fantix King |
removed subscriber Fantix King |
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| 2009-05-12 08:00:12 |
muchasuerte |
attachment added |
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lspci_dmesg.log http://launchpadlibrarian.net/26626106/lspci_dmesg.log |
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| 2009-05-12 08:10:20 |
Petter Eklund |
removed subscriber Petter Eklund |
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| 2009-06-19 20:59:01 |
Leann Ogasawara |
bug task added |
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linux (Ubuntu Jaunty) |
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| 2009-06-19 21:07:45 |
Leann Ogasawara |
linux (Ubuntu): status |
New |
Fix Released |
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| 2009-06-19 21:08:12 |
Leann Ogasawara |
linux (Ubuntu Jaunty): importance |
Undecided |
High |
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| 2009-06-19 21:08:12 |
Leann Ogasawara |
linux (Ubuntu Jaunty): status |
New |
Triaged |
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| 2009-07-09 17:30:49 |
Manoj Iyer |
linux (Ubuntu Jaunty): assignee |
|
Manoj Iyer (manjo) |
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| 2009-07-09 18:01:36 |
Manoj Iyer |
linux (Ubuntu Jaunty): status |
Triaged |
Incomplete |
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| 2011-07-18 18:11:46 |
Leann Ogasawara |
linux (Ubuntu Jaunty): status |
Incomplete |
Won't Fix |
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| 2013-06-04 07:32:40 |
Bug Watch Updater |
linux-2.6 (Debian): status |
New |
Fix Released |
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