linux-kernel - Issues with "x86, um: switch to generic fork/vfork/clone" commit

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Message-ID: <50F3D2F2.3080200@6wind.com>
Date:	Mon, 14 Jan 2013 10:42:10 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Al Viro <viro@...IV.linux.org.uk>, linux-kernel@...r.kernel.org
Subject: Issues with "x86, um: switch to generic fork/vfork/clone" commit

Hi,

I'm running a virtual host (kvm/qemu x86 32 bits 16 CPUs, debian wheezy) over a 
x86 64bits target.
The virtual host has problem during the boot with recent kernels (sometimes, 
daemons crash, but not always, and not always the same daemon). Here is an example:
[    2.150274] input: ImExPS/2 Generic Explorer Mouse as 
/devices/platform/i8042/serio1/input/input3
udevd[468]: timeout: killing 'firmware.agent' [587]

udevd[468]: 'firmware.agent' [587] terminated by signal 9 (Killed)

done.

[snip]

[   64.313636] kbd[2563]: segfault at 9fe ip 000009fe sp b758293c error 4 in 
dash[8048000+18000]

After bisecting, the following commit seems responsible:
1d4b4b2994b5fc208963c0b795291f8c1f18becf (x86, um: switch to generic 
fork/vfork/clone)

If the target boot, a simple way to reproduce the problem is to run 'update-grub':
root@...naps:~>update-grub
Generating grub.cfg ...
Found background image: /usr/share/images/desktop-base/desktop-grub.png
Found linux image: /boot/vmlinuz-3.8.0-rc3
Found initrd image: /boot/initrd.img-3.8.0-rc3

After the first or the second image, the script freeze:
[  152.982120] 10_linux[4814]: segfault at 12c9 ip 000012c9 sp b75ac93c error 4 
in dash[8048000+18000]

Enclosed is my .config.

Any help is welcome.

Regards,
Nicolas

View attachment "config" of type "text/plain" (94014 bytes)