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JFS locking problem detected (kernel 2.6.30)

Hi,

The problem log is attached below. It happened with current 2.6.30-rc6 kernel.

It happens with heavy disk IO. It is easy to trigger with kernel compilation in one 
console and git operations on the same tree in another.

Regards,
Krzysztof

=================================
[ INFO: inconsistent lock state ]
2.6.30-rc6 #60
---------------------------------
inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
kswapd0/181 [HC0[0]:SC0[0]:HE1:SE1] takes:
 (&jfs_ip->rdwrlock#2){++++?+}, at: [<c02d8d47>] jfs_get_block+0x47/0x280
{RECLAIM_FS-ON-W} state was registered at:
  [<c0241c95>] mark_held_locks+0x55/0x70
  [<c02421e6>] lockdep_trace_alloc+0x86/0xb0
  [<c0278cc1>] kmem_cache_alloc+0x21/0xe0
  [<c031650b>] radix_tree_preload+0x1b/0x60
  [<c0257351>] add_to_page_cache_locked+0x21/0xb0
  [<c0257408>] add_to_page_cache_lru+0x28/0x70
  [<c02575a8>] read_cache_page_async+0xa8/0x140
  [<c0257652>] read_cache_page+0x12/0x60
  [<c02f176e>] __get_metapage+0x10e/0x3f0
  [<c02e699d>] dbAllocAG+0x12d/0x490
  [<c02e717b>] dbAlloc+0x1fb/0x590
  [<c02f05e3>] extAlloc+0x1f3/0x5c0

Re: JFS locking problem detected (kernel 2.6.30)

On Sun, 2009-05-17 at 17:48 +0200, Krzysztof Helt wrote:
> Hi,
> 
> The problem log is attached below. It happened with current 2.6.30-rc6 kernel.
> 
> It happens with heavy disk IO. It is easy to trigger with kernel compilation in one 
> console and git operations on the same tree in another.

The lockdep stuff still confuses me, as I'm not spending as much time in
the file system as I used to.  Suggestions from linux-fsdevel &
elsewhere are appreciated.  

> Regards,
> Krzysztof
> 
> =================================
> [ INFO: inconsistent lock state ]
> 2.6.30-rc6 #60
> ---------------------------------
> inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
> kswapd0/181 [HC0[0]:SC0[0]:HE1:SE1] takes:
>  (&jfs_ip->rdwrlock#2){++++?+}, at: [<c02d8d47>] jfs_get_block+0x47/0x280
> {RECLAIM_FS-ON-W} state was registered at:

Anybody care to explain what this means in English?

>   [<c0241c95>] mark_held_locks+0x55/0x70
>   [<c02421e6>] lockdep_trace_alloc+0x86/0xb0
>   [<c0278cc1>] kmem_cache_alloc+0x21/0xe0
>   [<c031650b>] radix_tree_preload+0x1b/0x60

Possible deadlock in jfs_imap.c?

Hi,

for my master thesis, I've designed static checker for finding deadlocks in C.
My tool found some possible deadlock in file fs/jfs/jfs_imap.c
between JFS_IP(ipimap)->commit_mutex and  imap->im_aglock[agno].

Reason of this problem is probably missed unlocking of
JFS_IP(ipimap)->commit_mutex in branch starting at line 2564 which
leaves JFS_IP(ipimap)->commit_mutex locked:

    in function diNewIAG(..)
        locking mutex_lock(&JFS_IP(ipimap)->commit_mutex) at line 2540
        condition at line 2543 is false
        condition at line 2564 is true
        goto out: at 2579
        IAGFREE_UNLOCK(imap); at line 2654
    return from diNewIAG(..) at line 2656

Version of kernel is 2.6.28 (maybe this code is in newer versions too).
Could someone confirm, that this is a real bug? Thank you for your time.

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Re: Possible deadlock in jfs_imap.c?

On Sat, 2009-05-23 at 17:19 +0200, Jan Kucera wrote:
> Hi,
> 
> for my master thesis, I've designed static checker for finding deadlocks in C.
> My tool found some possible deadlock in file fs/jfs/jfs_imap.c
> between JFS_IP(ipimap)->commit_mutex and  imap->im_aglock[agno].
> 
> Reason of this problem is probably missed unlocking of
> JFS_IP(ipimap)->commit_mutex in branch starting at line 2564 which
> leaves JFS_IP(ipimap)->commit_mutex locked:
> 
>     in function diNewIAG(..)
>         locking mutex_lock(&JFS_IP(ipimap)->commit_mutex) at line 2540
>         condition at line 2543 is false
>         condition at line 2564 is true
>         goto out: at 2579
>         IAGFREE_UNLOCK(imap); at line 2654
>     return from diNewIAG(..) at line 2656
> 
> Version of kernel is 2.6.28 (maybe this code is in newer versions too).
> Could someone confirm, that this is a real bug? Thank you for your time.

Yes, it looks like a real bug.  As the comment states, it's an unlikely
error path. This would explain how it went undetected this long.  Should
be fixed anyway.

Thanks,
Shaggy
--

-- 
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