linux-kernel - Re: 2.6.21 reiserfs -- cicular locking?

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Date:	Fri, 27 Apr 2007 07:09:01 -0400
From:	Jeff Mahoney <jeffm@...e.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Brownell <david-b@...bell.net>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	reiserfs-dev@...esys.com
Subject: Re: 2.6.21 reiserfs -- cicular locking?

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Takashi Iwai wrote:
> At Fri, 27 Apr 2007 12:09:03 +0200,
> I wrote:
>> I got a similar bug right now at the fresh boot of 2.6.21.
>>
>>
>> ReiserFS: sda2: found reiserfs format "3.6" with standard journal
>> ReiserFS: sda2: using ordered data mode
>> ReiserFS: sda2: journal params: device sda2, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
>> ReiserFS: sda2: checking transaction log (sda2)
>> ReiserFS: sda2: Using r5 hash to sort names
>> ReiserFS: sda2: Removing [3613 1354701 0x0 SD]..done
>> ReiserFS: sda2: There were 1 uncompleted unlinks/truncates. Completed
>>
>> =======================================================
>> [ INFO: possible circular locking dependency detected ]
>> 2.6.21-work #1
>> -------------------------------------------------------
>> mktemp/1459 is trying to acquire lock:
>>  (&REISERFS_I(inode)->xattr_sem){..--}, at: [<e08a5236>] reiserfs_cache_default_acl+0x2a/0x9c [reiserfs]
>>
>> but task is already holding lock:
>>  (&inode->i_mutex){--..}, at: [<c016d7dc>] open_namei+0xe2/0x5a2
>>
>> which lock already depends on the new lock.
> The message disappears when I revert the patch:
> 
> commit 9b7f375505f5611efb562065b57814b28a81abc3
> Author: Jeff Mahoney <jeffm@...e.com>
> Date:   Mon Apr 23 14:41:17 2007 -0700
> 
>     reiserfs: fix xattr root locking/refcount bug
>     
> 
> So, likely a newly introduced bug after rc7...

I got a message with a trace similar to this from Vladimir before I
submitted that patch. I'm not sure how to annotate this, since the
xattr_sem can never be taken in the manner described. Internal inodes
are protected by I_PRIVATE.

- -Jeff

- --
Jeff Mahoney
SUSE Labs
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