linux-kernel - exit_mmap() BUG_ON triggering since 3.1

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Date:	Wed, 15 Feb 2012 13:33:18 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	linux-mm@...ck.org,
	Fedora Kernel Team <kernel-team@...oraproject.org>
Subject: exit_mmap() BUG_ON triggering since 3.1

We've had three reports against the Fedora kernel recently where
a process exits, and we're tripping up the 

        BUG_ON(mm->nr_ptes > (FIRST_USER_ADDRESS+PMD_SIZE-1)>>PMD_SHIFT);

in exit_mmap()

It started happening with 3.1, but still occurs on 3.2
(no 3.3rc reports yet, but it's not getting much testing).

https://bugzilla.redhat.com/show_bug.cgi?id=786632
https://bugzilla.redhat.com/show_bug.cgi?id=787527
https://bugzilla.redhat.com/show_bug.cgi?id=790546

I don't see anything special in common between the loaded modules.

anyone?

	Dave
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