bash-3.2$ gdb /usr/lib/thunderbird/thunderbird-bin 
GNU gdb 6.3.50_2004-11-23-cvs
Copyright 2004 Free Software Foundation, Inc.
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This GDB was configured as "i386-pc-solaris2.11"...(no debugging symbols found)

(gdb) run
Starting program: /usr/lib/thunderbird/thunderbird-bin 
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
warning: Lowest section in /lib/libpthread.so.1 is .dynamic at 00000074
warning: Lowest section in /lib/libthread.so.1 is .dynamic at 00000074
warning: Lowest section in /lib/librt.so.1 is .dynamic at 00000074
[New LWP 1]
[New LWP 2]
[New LWP 3]
[New LWP 4]
Starting calendar alarm service
observer added
[New LWP 5]
[New LWP 6]
[New LWP 7]
[LWP 6 exited]
[New LWP 6]
[LWP 7 exited]
[New LWP 7]
*** Calendar schema version is: 7
[New LWP 8]
[New LWP 9]

Program received signal SIGSEGV, Segmentation fault.
0xfed4627c in _ceil_mylist_del () from /usr/lib/thunderbird/../libc.so.1
(gdb) cont
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0xfed531c7 in _lwp_kill () from /usr/lib/thunderbird/../libc.so.1
(gdb) cont
Continuing.
warning: rw_common (): unable to read at addr 0xfedeb39c
warning: rw_common (): unable to read at addr 0xfedeb3a0
thread_to_lwp: td_ta_map_id2thr Debugger service failed