linux-kernel - Re: [PATCH 2/2] Fix possible leakage of blocks in UDF

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Message-ID: <20070602063403.GA8387@cvg>
Date:	Sat, 2 Jun 2007 10:34:03 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Eric Sandeen <sandeen@...deen.net>, Jan Kara <jack@...e.cz>,
	linux-kernel@...r.kernel.org, Cyrill Gorcunov <gorcunov@...il.com>
Subject: Re: [PATCH 2/2] Fix possible leakage of blocks in UDF

[Andrew Morton - Fri, Jun 01, 2007 at 10:43:39PM -0700]
| On Sat, 02 Jun 2007 00:17:51 -0500 Eric Sandeen <sandeen@...deen.net> wrote:
| 
| > Andrew Morton wrote:
| > > On Fri, 01 Jun 2007 17:37:49 -0500
| > > Eric Sandeen <sandeen@...deen.net> wrote:
| > 
| > >> going for the inode_lock twice?
| > >>
| > > 
| > > lockdep should catch that.
| > > 
| > 
| > hey that's a good idea...!  *sigh* sometimes I worry about myself... but 
| > hey at least I got it right. :)
| > 
| > =============================================
| > [ INFO: possible recursive locking detected ]
| > 2.6.22-rc3 #8
| > ---------------------------------------------
| > lt-fsstress/3285 is trying to acquire lock:
| >   (inode_lock){--..}, at: [<ffffffff802b0de9>] __mark_inode_dirty+0xe2/0x16c
| > 
| > but task is already holding lock:
| >   (inode_lock){--..}, at: [<ffffffff80316cc9>] 
| > _atomic_dec_and_lock+0x39/0x58
| > 
| > other info that might help us debug this:
| > 3 locks held by lt-fsstress/3285:
| >   #0:  (&inode->i_mutex/1){--..}, at: [<ffffffff8029f262>] 
| > do_rmdir+0x7c/0xe3
| >   #1:  (&inode->i_mutex){--..}, at: [<ffffffff80462809>] 
| > mutex_lock+0x22/0x24
| >   #2:  (inode_lock){--..}, at: [<ffffffff80316cc9>] 
| > _atomic_dec_and_lock+0x39/0x58
| > 
| > stack backtrace:
| > 
| > Call Trace:
| >   [<ffffffff8024e1fc>] __lock_acquire+0x155/0xbaa
| >   [<ffffffff802b0de9>] __mark_inode_dirty+0xe2/0x16c
| >   [<ffffffff8024eccc>] lock_acquire+0x7b/0x9f
| >   [<ffffffff802b0de9>] __mark_inode_dirty+0xe2/0x16c
| >   [<ffffffff80463bc9>] _spin_lock+0x1e/0x28
| >   [<ffffffff802b0de9>] __mark_inode_dirty+0xe2/0x16c
| >   [<ffffffff882dc7cc>] :udf:udf_write_aext+0x101/0x11b
| >   [<ffffffff882e5992>] :udf:extent_trunc+0xd6/0x123
| >   [<ffffffff882e5ab9>] :udf:udf_truncate_tail_extent+0xda/0x171
| >   [<ffffffff882dfc5e>] :udf:udf_drop_inode+0x26/0x35
| >   [<ffffffff802a726d>] iput+0x74/0x76
| >   [<ffffffff802a4e9b>] dentry_iput+0xa0/0xb8
| >   [<ffffffff802a612a>] prune_dcache+0xa2/0x174
| >   [<ffffffff802a4f3c>] d_kill+0x21/0x43
| >   [<ffffffff802a5eef>] prune_one_dentry+0x3a/0xef
| >   [<ffffffff802a6175>] prune_dcache+0xed/0x174
| >   [<ffffffff802a6253>] shrink_dcache_parent+0x21/0x10e
| >   [<ffffffff8029becd>] dentry_unhash+0x26/0x84
| >   [<ffffffff8029d23c>] vfs_rmdir+0x88/0x117
| >   [<ffffffff8029f287>] do_rmdir+0xa1/0xe3
| >   [<ffffffff8020cf4b>] syscall_trace_enter+0x8d/0x8f
| >   [<ffffffff8029f300>] sys_rmdir+0x11/0x13
| >   [<ffffffff80209da5>] tracesys+0xdc/0xe1
| > 
| 
| Well.  Documentation/filesystems/Locking says
| 
| drop_inode:             no                              !!!inode_lock!!!
| 
| That patch is DOA, methinks.
| 

Andrew, what does it mean - "DOA"? Dead on arrival?

		Cyrill

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