linux-kernel - 2.6.{26.2,27-rc} oops on virtualbox

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-next>] [day] [month] [year] [list]

Message-ID: <20080820162925.75a5e064@doriath.conectiva>
Date:	Wed, 20 Aug 2008 16:29:25 -0300
From:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
To:	linux-kernel@...r.kernel.org
Cc:	mathieu.desnoyers@...ymtl.ca, mingo@...e.hu
Subject: 2.6.{26.2,27-rc} oops on virtualbox

 Hi there,

 Users of different Linux distros (includes Ubuntu, Mandriva, ArchLinux and
possibly Fedora) are reporting that kernel 2.6.26.2 is OOPSing in the
Virtual Box emulator[1].

 It is not clear if this is a kernel or Virtual Box bug, but as the kernel
is also OOPsing in QEMU (although with different behaivor) I have decided
to post my debug results here in case someone is interested in debugging
the kernel part further.

 I have done a bisection by hand among kernel versions and found that
the commit which triggers the oops in _Virtual Box_ was introduced in
2.6.26-rc1 and the problem also happens with latest Linus tree.

 By using git bisect I found that the commit is this:

"""
commit e587cadd8f47e202a30712e2906a65a0606d5865
Author: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Date:   Thu Mar 6 08:48:49 2008 -0500

    x86: enhance DEBUG_RODATA support - alternatives

[...]

"""

 By reverting this commit I don't get the OOPS anymore. I have
tested with 2.6.26-rc1 and latest Linus tree (2.6.27-rc3).

 What puzzles me though is that a similar problem happens with
QEMU, but it also OOPSes with kernels before 2.6.26-rc1,
reverting the patch above makes no difference and it works with
current Linus tree.

 Does this look like a kernel bug?

 All my tests have been done with vanilla kernels, but I have
built .iso installation images with them and I'm not sure of
what the build script does.

[1] http://en.wikipedia.org/wiki/Virtual_box

 Thanks for reading this.

-- 
Luiz Fernando N. Capitulino
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/