linux-kernel - Re: ipc/testmsg GPF.

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Message-ID: <20130307220333.GA31039@redhat.com>
Date:	Thu, 7 Mar 2013 17:03:33 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Miller <davem@...emloft.net>
Subject: Re: ipc/testmsg GPF.

On Thu, Mar 07, 2013 at 01:45:27PM -0800, Linus Torvalds wrote:
 > Adding Davem to the list, since this looks like networking.
 > 
 > That said, I'm also starting to wonder if you're just triggering odd
 > bugs because of some use-after-free corruption of random kernel data
 > structures?

Plausible. The sheer volume of crashes I've started seeing in the last 24 hours
since adding those small features to trinity are making me really suspicious.
If I had this volume of crashes reported to me by a Fedora user, I'd be
suspecting their hardware ;)

Tangentally related: We have a *ton* of weird bug reports against Fedora
that have been open for a while that look like random memory corruption
(linked list corruption, 'bad page table' scribbles etc).
I'd *love* to think that the bugs I'm now seeing are related, on the off-chance
we can finally get some resolution on those.

 > I seem to have a dim memory of you usually doing your
 > trinity runs with more debugging options, but based on just the oops
 > message you don't have DEBUG_PAGEALLOC enabled, for example. Maybe
 > that and SLUB debugging might turn up the culprit more quickly..

My kernel-hacker hive-mind implant is working. Just started a rebuild with that enabled.
Had slub debug already.

 > [ Just checked - yes, you often do have DEBUG_PAGEALLOC in your oops
 > reports, but not this time. list debugging too? ]

Yep.

	Dave

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