Bug#495949: grub-common: grub-probe segfaults

[Jean-Luc Coulon (f5ibh)]

Hi Felix,

>> Jean-Luc
>
>Oh not good.
>Then please do again a debug compile with `DEB_BUILD_OPTIONS="nostrip
>noopt debug" dpkg-buildpackage -b'
>and get a backtrace with gdb.
>See [0] for my previous mail but note the spaces now in
>DEB_BUILD_OPTIONS instead of the commas. I was wrong.
>
>[0] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=495949#30
>

So, I rebuilt grub.
Then as I don't know how to debug directly the shell script (grub-
install), I laaunched it with set -x and got the failing line:

--->8---------->8------------->8----------->8------------>8----------
...
+ /usr/bin/grub-mkimage --output=/boot/grub/core.img '--prefix=(md0)/
grub' biosdisk ext2 pc raid mdraid
+ /usr/sbin/grub-setup --force --directory=/boot/grub --device-map=/
boot/grub/device.map /dev/md0
./grub-install: line 323:  4663 Erreur de segmentation  $grub_setup 
${setup_verbose} ${setup_force} --directory=${grubdir} --device-map=
${device_map} ${install_device}
+ exit 1
--->8---------->8------------->8----------->8------------>8----------

So I launched gdb as follos, I don't know if it is the right process... 
but I got a (small) backtrace):

--->8---------->8------------->8----------->8------------>8----------
[jean-luc at tangerine] % sudio gdb --args /usr/sbin/grub-setup --force --
directory=/boot/grub --device-map=/boot/grub/device.map /dev/md0
GNU gdb (GDB) 6.8.50.20090628-cvs-debian
Copyright (C) 2009 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 "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
(gdb) run
Starting program: /usr/sbin/grub-setup --force --directory=/boot/grub 
--device-map=/boot/grub/device.map /dev/md0

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7b08c60 in strcmp () from /lib/libc.so.6
(gdb) bt
#0  0x00007ffff7b08c60 in strcmp () from /lib/libc.so.6
#1  0x0000000000401cb1 in setup (dir=0x63e010 "/boot/grub", 
    boot_file=0x4279f4 "boot.img", core_file=0x4279eb "core.img", 
    root=0x64b9c0 "md0", dest=0x0, must_embed=1, force=1)
    at /usr/local/src/tmp/grub/grub2-1.96+20090721/util/i386/pc/grub-
setup.c:335
#2  0x0000000000402cea in main (argc=5, argv=0x7fffffffe8a8)
    at /usr/local/src/tmp/grub/grub2-1.96+20090721/util/i386/pc/grub-
setup.c:774
(gdb) 
--->8---------->8------------->8----------->8------------>8----------

Best regards

Jean-Luc
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