linux-kernel - Re: [RFC v2 3/4] locks: Split insert/delete block functions into flock/posix parts

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Date:	Wed, 4 Mar 2015 16:32:57 +0100
From:	Daniel Wagner <daniel.wagner@...-carit.de>
To:	Boaz Harrosh <openosd@...il.com>,
	Jeff Layton <jlayton@...chiereds.net>
CC:	Jeff Layton <jlayton@...marydata.com>,
	<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC v2 3/4] locks: Split insert/delete block functions into
 flock/posix parts

On 03/04/2015 04:00 PM, Boaz Harrosh wrote:
> On 03/04/2015 04:20 PM, Daniel Wagner wrote:
>> On 03/03/2015 01:55 AM, Jeff Layton wrote:
>>> On Mon,  2 Mar 2015 15:25:12 +0100
>>> Daniel Wagner <daniel.wagner@...-carit.de> wrote:
>>>
> <>
>> I have fixed that stuff and now I am testing it. Though it seems
>> that there is a memory leak which can be triggered with 
>>
>> 	while true; rm -rf /tmp/a; ./lease02 /tmp/a; done
>>
>> and this happens also without any of my patches. Still trying to
>> figure out what's happening. Hopefully I just see a ghost.
>>
>> slabtop tells me that ftrace_event_field is constantly growing:
>>
> 
> check out the Kernel's leak detector it is perfect in showing you
> what was the exact call stack of the leaked memory.

Thanks for the tip. Will use it in future :)

I have done a quick bisect limit the search on fs/locks.c.
I suspect that the file_lock_context refactoring is the source of the leak.
bisect agrees with me


8634b51f6ca298fb8b07aa4847340764903533ab is the first bad commit
commit 8634b51f6ca298fb8b07aa4847340764903533ab
Author: Jeff Layton <jlayton@...marydata.com>
Date:   Fri Jan 16 15:05:55 2015 -0500

    locks: convert lease handling to file_lock_context
    
    Signed-off-by: Jeff Layton <jlayton@...marydata.com>
    Acked-by: Christoph Hellwig <hch@....de>

:040000 040000 4114db9392dc4dadb30664b71a954321e5e87bab 5b9abbaf1808a7c926c09fa2164044e0cc26fd54 M      fs
:040000 040000 bd569f527a195edf673c4f7d0e80bf356c7f8d1b 6362646e04dd83efc1a9e92877900797ac879e9a M      include

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