linux-kernel - Re: __blkg_lookup oops with 4.2-rcX

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 5 Sep 2015 16:34:39 +0100
From:	"Richard W.M. Jones" <rjones@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	Jeff Moyer <jmoyer@...hat.com>, msnitzer@...hat.com,
	Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: __blkg_lookup oops with 4.2-rcX

On Fri, Sep 04, 2015 at 09:42:44PM +0100, Richard W.M. Jones wrote:
> On Fri, Sep 04, 2015 at 01:13:02PM -0400, Tejun Heo wrote:
> > The only struct which is large enough for 0xbb8 offset is
> > request_queue.  Hmm.... can you please try the brute force debug patch
> > below and report the kernel log after the crash?
> 
> So the good(?) news is this bug is not reproducible with the Fedora
> kernel 4.3.0-0.rc0.git7.1.fc24.x86_64 (tested both with and without
> your patch).
> 
> I'll keep it running overnight just in case ..

In fact the bug does happen with 4.3.0-0.rc0.git7.1.fc24.x86_64, but
it's a bit rarer than before.

I'm now using your patch, and the output from the patch is attached.
I hope that helps - let me know if there's anything else you'd want me
to try.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

View attachment "log" of type "text/plain" (121966 bytes)