Problems with gdb on 64 bit systems

Jan Kratochvil
Fri Jan 27 23:44:00 GMT 2012

On Sat, 28 Jan 2012 00:33:01 +0100, sudhakar govindavajhala wrote:
> On a 64 bit system, I am unable to read any core dump in gdb.    I
> generated the core dumps in two ways: via null pointer derefernce in
> program and via gdb attach and gcore.
> In both the cases, I am unable to read the core files. Do you have any thoughts?

Works for me on Fedora 16 x86_64:

$ echo 'f(){*(int*)0=0;}main(){f();}'|cc -x c -;(ulimit -c unlimited;./a.out);gdb -batch ./a.out ./core.* -ex bt 
[New LWP 11907]
Missing separate debuginfo for 
Try: yum --disablerepo='*' --enablerepo='*-debuginfo' install /usr/lib/debug/.build-id/1e/2a683b7d877576970e4275d41a6aaec280795e
Core was generated by `./a.out'.
Program terminated with signal 11, Segmentation fault.
#0  0x000000000040047d in f ()
#0  0x000000000040047d in f ()
#1  0x0000000000400493 in main ()

> For gdb 7, I tried two different  machines maintained by different
> organizations to see what the issue may be.  Both are failing.

You need to be more specific.  And best to submit the problem for GDB release
by that OS vendor.


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