GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 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 "i686-linux-gnu".
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<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/yelp...Reading symbols from /usr/lib/debug/usr/bin/yelp...done.
done.
(gdb) handle SIG33 pass nostop noprint
Signal        Stop	Print	Pass to program	Description
SIG33         No	No	Yes		Real-time event 33
(gdb) backtrace full
No stack.
(gdb) info registers
The program has no registers now.
(gdb) x/16i $pc
No registers.
(gdb) thread apply all backtrace
(gdb) quit