linux-kernel - Re: a whole bunch of crashes since todays -mm merge.

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Message-ID: <20120608010008.GA7191@redhat.com>
Date:	Thu, 7 Jun 2012 21:00:08 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: a whole bunch of crashes since todays -mm merge.

On Thu, Jun 07, 2012 at 05:52:52PM -0700, Linus Torvalds wrote:
 > On Thu, Jun 7, 2012 at 5:24 PM, Dave Jones <davej@...hat.com> wrote:
 > > I just started seeing crashes while doing simple things, like logging on a console..
 > 
 > I'm looking at it right now, and the sync_mm_rss() patch is pure
 > garbage. In many ways.
 > 
 > You can't do sync_mm_rss() from mmdrop(), because there's no reason to
 > believe that the task that does mmdrop() does it on its own active_mm.
 > And even if you *could* do it there, it's still horribly wrong,
 > because it does it at the end *after* it already freed the mm!
 > 
 > Does it go away if you revert that (commit 40af1bbdca47). I wish I
 > hadn't merged it, or that I had noticed how horrible it was before I
 > pushed out.

Hmm, I did a rebuild with a r8169 debug patch Francois sent me backed out,
and now it looks like it's fine again.

Or I might just be getting lucky..

	Dave

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