user@box:~$ /usr/bin/thunderbird
/usr/bin/thunderbird: line 137:  2858 Segmentation fault      $AOSS $MOZ_PROGRAM $@
user@box:~$ rpm -q MozillaThunderbird
MozillaThunderbird-2.0.0.9-0.1

After setting the appropriate environment variables, gdb gives:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb70cc6d0 (LWP 2934)]
0xb7295b55 in strtok () from /lib/libc.so.6
(gdb) bt
#0  0xb7295b55 in strtok () from /lib/libc.so.6
#1  0xb75de614 in ldap_str2charray () from /usr/lib/thunderbird/libldap50.so
#2  0xb707620c in ?? () from /usr/lib/libldap-2.3.so.0
#3  0xb708911a in ?? () from /usr/lib/libldap-2.3.so.0
#4  0xb7088ebe in ?? () from /usr/lib/libldap-2.3.so.0
#5  0x00000001 in ?? ()
#6  0x00000001 in ?? ()
#7  0x00000000 in ?? ()

Last few lines of strace -f before the SEGV:

[pid  2965] open("/etc/host.conf", O_RDONLY) = 4
[pid  2965] fstat64(4, {st_mode=S_IFREG|0644, st_size=370, ...}) = 0
[pid  2965] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7ea3000
[pid  2965] read(4, "#\n# /etc/host.conf - resolver co"..., 4096) = 370
[pid  2965] read(4, "", 4096)           = 0
[pid  2965] close(4)                    = 0
[pid  2965] munmap(0xb7ea3000, 4096)    = 0
[pid  2965] futex(0xb7368800, FUTEX_WAKE, 2147483647) = 0
[pid  2965] open("/etc/hosts", O_RDONLY) = 4
[pid  2965] fcntl64(4, F_GETFD)         = 0
[pid  2965] fcntl64(4, F_SETFD, FD_CLOEXEC) = 0
[pid  2965] fstat64(4, {st_mode=S_IFREG|0644, st_size=689, ...}) = 0
[pid  2965] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7ea3000
[pid  2965] read(4, "#\n# hosts         This file desc"..., 4096) = 689
[pid  2965] read(4, "", 4096)           = 0
[pid  2965] close(4)                    = 0
[pid  2965] munmap(0xb7ea3000, 4096)    = 0
[pid  2965] --- SIGSEGV (Segmentation fault) @ 0 (0) ---
Process 2962 resumed
Process 2965 detached

user@box:~$ cat /etc/SuSE-release
openSUSE 10.3 (i586)
VERSION = 10.3
user@box:~$ uname -a
Linux box 2.6.22.13-0.3-default #1 SMP 2007/11/19 15:02:58 UTC i686 i686 i386 GNU/Linux

I hope this gives you a rough idea, but I can't fathom which information you need to pin down the problem, so please tell me what you need.

Kind regards
FDF