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

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Date:	Sat, 02 Jun 2007 00:17:51 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	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 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

-Eric
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