linux-kernel - Re: 2.6.31-rc8 JFS inconsistent lock state

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Date:	Fri, 04 Sep 2009 10:24:52 -0500
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	"Frank A. Kingswood" <frank@...gswood-consulting.co.uk>
Cc:	linux-kernel@...r.kernel.org,
	JFS Discussion <jfs-discussion@...ts.sourceforge.net>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: 2.6.31-rc8 JFS inconsistent lock state

On Thu, 2009-09-03 at 08:18 +0100, Frank A. Kingswood wrote:
> Frank A. Kingswood wrote:
> 
> > I'm running jfs on md and got this error. The system is still usable 
> > afterwards (and has not been rebooted yet) so I could provide more 
> > information if needed.
> > 
> > The system has occasionally had hard crashes during file access (perhaps 
> > starting with about 2.6.29) and these may be related.
> 
> The same happens with 2.6.31-rc8
> 
> Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
> ... MAX_LOCKDEP_SUBCLASSES:  8
> ... MAX_LOCK_DEPTH:          48
> ... MAX_LOCKDEP_KEYS:        8191
> ... CLASSHASH_SIZE:          4096
> ... MAX_LOCKDEP_ENTRIES:     16384
> ... MAX_LOCKDEP_CHAINS:      32768
> ... CHAINHASH_SIZE:          16384
>   memory used by lock dependency info: 6207 kB
>   per task-struct memory footprint: 2688 bytes
> 
> ...a while later...

I looked at this a while back:

http://lkml.org/lkml/2009/5/18/358

I didn't get a response to that, and I didn't follow up.  I guess it's
time to get back on it.  I'll try to recreate the warning and see if
this patch helps:

diff --git a/mm/filemap.c b/mm/filemap.c
index ccea3b6..59f5406 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1702,7 +1702,8 @@ repeat:
 		page = page_cache_alloc_cold(mapping);
 		if (!page)
 			return ERR_PTR(-ENOMEM);
-		err = add_to_page_cache_lru(page, mapping, index, GFP_KERNEL);
+		err = add_to_page_cache_lru(page, mapping, index,
+					    mapping_gfp_mask(mapping));
 		if (unlikely(err)) {
 			page_cache_release(page);
 			if (err == -EEXIST)

-- 
David Kleikamp
IBM Linux Technology Center

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