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

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Message-Id: <20140416.145822.1317931249717152474.davem@davemloft.net>
Date:	Wed, 16 Apr 2014 14:58:22 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	aaro.koskinen@....fi
Cc:	mroos@...ux.ee, 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: Aaro Koskinen <aaro.koskinen@....fi>
Date: Mon, 14 Apr 2014 21:43:53 +0300

> 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.

Simply, as root:

bash# echo "never" >/sys/kernel/mm/transparent_hugepage/enabled

And then do your gcc bootstraps or whatever else seems to usually
run when you trigger this problem.

Thanks!
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