GNU gdb Fedora (6.8-37.el5)
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This GDB was configured as "i386-redhat-linux-gnu"...
Core was generated by `/usr/sbin/asterisk -f -vvvg -c'.
Program terminated with signal 6, Aborted.
[New process 28831]
#0  0x0061b402 in __kernel_vsyscall ()
(gdb) bt full
#0  0x0061b402 in __kernel_vsyscall ()
No symbol table info available.
Cannot access memory at address 0x506a264
(gdb) thread apply all bt

Thread 1 (process 28831):
#0  0x0061b402 in __kernel_vsyscall ()
Cannot access memory at address 0x506a264