linux-kernel - Re: WARNING: at mm/page-writeback.c:1990 __set_page_dirty

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Date:	Fri, 1 Jun 2012 09:43:23 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Cong Wang <amwang@...hat.com>
Subject: Re: WARNING: at mm/page-writeback.c:1990
 __set_page_dirty_nobuffers+0x13a/0x170()

On Thu, May 31, 2012 at 07:43:25PM -0700, Linus Torvalds wrote:
 > On Thu, May 31, 2012 at 7:31 PM, Dave Jones <davej@...hat.com> wrote:
 > >
 > > So I bisected it anyway, and it led to ...
 > 
 > Ok, that doesn't sound entirely unlikely, but considering that you're
 > nervous about the bisection, please just try to revert it and see if
 > that fixes your testcase.
 > 
 > You'll obviously need to revert the commit that removes
 > vmtruncate_range() too, since reverting 3f31d07571ee will re-introduce
 > the use of it (it's the next one:
 > 17cf28afea2a1112f240a3a2da8af883be024811), but it looks like those two
 > commits revert cleanly and the end result seems to compile ok.

crap, so much for that theory.  I ran latest with those two reverted
overnight, and woke up to a dead box.  Over serial console, I see
a bunch of those same compaction oopses (Via sys_mmap_pgoff),
and then kernel BUG at include/linux/mm.h:448! was the last thing
it said before it choked.

I'll redo the bisect. It's possible that one of the 'good' paths just
didn't run for long enough.

	Dave

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