Re: How to debug a hang process if the hung process itself is gdb !

Michael Snyder
2010-10-05T17:40:55Z

santoshp wrote:
> Hi All,
> I have a problem, I have a signal handler for few fatal signals e.g.
> sigsegv, sigill etc. The handler will dump the stack trace in the log when
> those signals will be triggered using GDB in batch mode. What I do is fork()
> a process and inside the child I exec() the gdb process to capture the stack
> tarce. The command will be something like this:
>
> /usr/bin/gdb <binary path> <running pid> -batch -n -x <command file>
>
> cat $commandfile
>
> set pagination off
> set width 65536
> thread apply all bt
> detach
>
> But it seems the gdb itself hung and the process attached is also hung. How
> to debug them ?
>
> Is there a way to see the stack trace for hung gdb process or the running
> process to be debugged which was attached to gdb?
>
> If anybody knows of any known issues with GDB, please share.
>
> GDb version: GNU gdb Red Hat Linux (6.5-37.el5_2.2rh),
> "x86_64-redhat-linux-gnu", OS is RHEL5 running on x86_64. Please let me know
> if this is not the place to discuss this. Any help or pointer would be of
> great help.
>
>
> Thanks in advance.
>
> Regards,
> Santosh
>

Have you tried attaching a fresh gdb to the hung gdb?