linux-kernel - Re: sparc64 WARNING: at mm/mmap.c:2757 exit

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Message-Id: <20140416.184922.850531879281945129.davem@davemloft.net>
Date:	Wed, 16 Apr 2014 18:49:22 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mroos@...ux.ee
Cc:	aaro.koskinen@....fi, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, hughd@...gle.com
Subject: Re: sparc64 WARNING: at mm/mmap.c:2757 exit_mmap+0x13c/0x160()

From: mroos@...ux.ee
Date: Thu, 17 Apr 2014 01:22:17 +0300 (EEST)

>> > Just for the archives, I got one of these again with 3.14:
>> 
>> Meelis and Aaro, thanks again for all of your reports.
>> 
>> After pouring over a lot of the data and auditing some code I'm
>> suspecting it's a problem with transparent huge pages.
>> 
>> One thing you two can do to help me further confirm this is to run
>> with THP disabled for a while and see if you still get the log
>> messages.
> 
> I have snice turned off CONFIG_TRANSPARENT_HUGEPAGE on 3 of 4 servers 
> that had this problem (actually most of my sparc64 machines) and the 4th 
> has
 ...
> and also has not had this problem since then. All 4 machines have been 
> running through most -rc's of every kernel.

Thanks this is a very useful datapoint.
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