linux-kernel - kernel 2.6.39 (user mode linux) crashes (2.6.38 works fine)

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Date:	Thu, 19 May 2011 15:26:31 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	linux-kernel@...r.kernel.org
Subject: kernel 2.6.39 (user mode linux) crashes (2.6.38 works fine)

I got a segfault as soon as I try to access the phpmyadmin web page of the UML 
instance at https://<uml_hostname>/phpmyadmin/  :

/home/tfoerste/workspace/bin/start_uml.sh: line 72: 21972 Segmentation fault      
(core dumped) sh -c "$LINUX ubda=$ROOT_FS ubdb=$SWAP_FS $CD eth0=tuntap,,,$TAP 
mem=256M $TTY $*"

A core file is produced, but seems not to have usefull info in it:

tfoerste@n22 ~ $ gdb --core=core
GNU gdb (Gentoo 7.2 p1) 7.2
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.gentoo.org/>.
[New Thread 22866]
Failed to read a valid object file image from memory.
Core was generated by `'.
Program terminated with signal 5, Trace/breakpoint trap.
#0  0x001000ec in ?? ()
(gdb) bt
#0  0x001000ec in ?? ()
#1  0x00101aa8 in ?? ()
#2  0xb78b2400 in ?? ()
#3  0x0000000b in ?? ()
#4  0x00000033 in ?? ()
#5  0x00000000 in ?? ()

Which kernel option I should activate to get more info in the core file ?
-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

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