linux-kernel - chroot under kernel 3.4.x gives core dumps

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Message-ID: <4FCD28E4.3090409@gmx.de>
Date:	Mon, 04 Jun 2012 23:30:12 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: chroot under kernel 3.4.x gives core dumps

When I try under both kernel versions to chroot into a user mode linux
image, I often get this :

+ mount -o loop /home/tfoerste/virtual/uml/gentoo_unstable /mnt/loop
+ mount -t proc none /mnt/loop/proc
+ mount -o bind /dev /mnt/loop/dev
+ mount -o bind /dev/pts /mnt/loop/dev/pts
+ mount -o bind /usr/portage /mnt/loop/usr/portage
+ mount -o bind /usr/local/portage /mnt/loop/usr/local/portage
+ mount -o bind /tmp/uml_portage /mnt/loop/var/tmp/portage
+ chroot /mnt/loop /bin/bash
/home/tfoerste/workspace/bin/chr_uml.sh: line 55:  4143 Segmentation
fault      (core dumped) chroot /mnt/loop /bin/bash


The core file itself is only 400 KB in size and the back trace with gbd
is meaningless :

Core was generated by `/bin/bash'.
Program terminated with signal 11, Segmentation fault.
#0  0xb75cac00 in ?? ()
(gdb) bt
#0  0xb75cac00 in ?? ()
#1  0xb76f4ff4 in ?? ()
Cannot access memory at address 0xffffffdc


In the rare cases, where the chroot doesn't crash, all subsequent
commands cores instead.

Furthermore it seems, that the boinc grid software has problems too
under kernel 3.4.1.

All kernel 3.3.x works fine.

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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