gdb - bt full

(gdb) bt full
#0  0x815e3381 in ?? ()
No symbol table info available.
#1  0x8167119c in ?? ()
No symbol table info available.
#2  0x816719e7 in ?? ()
No symbol table info available.
#3  0x845920ab in ?? ()
No symbol table info available.
#4  0xb6ae9de4 in __libc_start_main ()
   from /lib/i386-linux-gnu/i686/cmov/libc.so.6
No symbol table info available.
#5  0x8030abdd in ?? ()
No symbol table info available.
(gdb)

(gdb) backtrace
#0  0x815e3381 in ?? ()
#1  0x00000000 in ?? ()
(gdb) backtrace full
#0  0x815e3381 in ?? ()
No symbol table info available.
#1  0x00000000 in ?? ()
No symbol table info available.

(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /usr/lib/chromium/chromium nopass
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/i686/cmov/libthread_db.so.1".

Program received signal SIGILL, Illegal instruction.
0x815e3381 in ?? ()
(gdb)