linux-kernel - Re: INFO: possible circular locking dependency detected

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Date:	Tue, 17 Oct 2006 01:46:35 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Randy Dunlap <rdunlap@...otime.net>
CC:	"alpha @ steudten Engineering" <alpha@...udten.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: INFO: possible circular locking dependency detected

Randy Dunlap wrote:
> On Tue, 17 Oct 2006 00:32:44 +1000 Nick Piggin wrote:
> 
> 
>>alpha @ steudten Engineering wrote:
>>
>>>=======================================================
>>>[ INFO: possible circular locking dependency detected ]
>>>2.6.18-1.2189self #1
>>>-------------------------------------------------------
>>>kswapd0/186 is trying to acquire lock:
>>> (&inode->i_mutex){--..}, at: [<c0326e32>] mutex_lock+0x21/0x24
>>>
>>>but task is already holding lock:
>>> (iprune_mutex){--..}, at: [<c0326e32>] mutex_lock+0x21/0x24
>>>
>>>which lock already depends on the new lock.
>>
>>Thanks. __grab_cache_page wants to clear __GFP_FS, because it is
>>holding the i_mutex so we don't want to reenter the filesystem in
>>page reclaim.
>>
>>This would be an easy two liner, except those funny page_cache_alloc
>>routines which take a mapping rather than a gfp_t argument :P
> 
> 
> and it would be only one email, but you forgot spaces there,
> so it's too ugly to use.  ;)  i.e., please add spaces around
> the '&'.
> 
> and it's an attachment :(

Oh yeah, it was an attachment because I didn't want anyone to see how
ugly it is ;)

It's just a quick hack to see if it works. I'll send out a real patch
when I get time to code and test it properly.

-- 
SUSE Labs, Novell Inc.
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