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Date:	Sun, 17 May 2009 09:59:30 -0400
From:	Jeff Mahoney <>
To:	Stefan Richter <>
Cc:	"Rafael J. Wysocki" <>, Ingo Molnar <>,
	Martin Bammer <>,
	Andrew Morton <>,
	Linux Kernel Mailing List <>,
	Adrian Bunk <>,
	Linus Torvalds <>,
	Natalie Protasevich <>,
	Kernel Testers List <>,
	Network Development <>
Subject: Re: 2.6.30-rc6: Reported regressions from 2.6.29

Hash: SHA1

Stefan Richter wrote:
> Rafael J. Wysocki wrote:
>> On Sunday 17 May 2009, Ingo Molnar wrote:
>>> * Rafael J. Wysocki <> wrote:
>>>> Bug-Entry    :
>>>> Subject        : kernel crash with NULL pointer when boot
>>>> Submitter    : Martin Bammer <>
>>>> Date        : 2009-05-16 12:37 (1 days old)
>>>> References    :
>>> that crash is in reiserfs_for_each_xattr(), during sys_unlink()'s
>>> xattr teardown.
>>> There's been a good deal of reiserfs changes in this cycle - some
>>> touch the xattr code as well. Some of them fairly late in the cycle,
> (Also, the bug is reportedly a post -rc5 regression.)
>>> in the last two weeks:
>>>  earth4:~/tip> gll v2.6.29..linus --since=two-weeks-ago fs/reiserfs/
>>>  2a32ceb: Fix races around the access to ->s_options
>>>  677c9b2: reiserfs: remove privroot hiding in lookup
>>>  b82bb72: reiserfs: dont associate security.* with xattr files
>>>  ab17c4f: reiserfs: fixup xattr_root caching
>>>  edcc37a: Always lookup priv_root on reiserfs mount and keep it
>>>  5a6059c: reiserfs: Expand i_mutex to enclose lookup_one_len
>>> Martin, you could try a blind revert of say ... ab17c4f, which looks
>>> the most suspect and which is also a rather large commit.
>>> Or/and you could try a bisect - perhaps accelerated via:
>>>    git bisect start fs/reiserfs/
>> I think there's a fix already for this in the works, but it hasn't
>> been merged
>> yet.  It looks like Jeff has just posted some reiserfs fixes. :-)
> I'd say Martin should try Jeff's pending patches before a revert or
> before starting a bisection.  Either apply them from
>, or pull from
>  git:// for-next
> or wait for them to appear in Linus' tree...
> I for one didn't test the post v2.6.30-rc5 changes to reiserfs, but I
> did try them _together_ with the four pending patches on a system with
> reiserfs root filesystem and extended attributes disabled in the config.
> Everything is fine here after almost a week uptime.

Yes, this bug is known and is fixed with "[patch 2/4] [PATCH] reiserfs:
deal with NULL xattr root w/ xattrs disabled"

- -Jeff

- --
Jeff Mahoney
Version: GnuPG v2.0.9 (GNU/Linux)
Comment: Using GnuPG with SUSE -

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