topic Re: Problem debugging with gdb in Operating System - HP-UX

Problem debugging with gdb

Maribeth Romeo — Mon, 25 Oct 2004 09:25:36 GMT

When I try to run gdb against my program on an HP-UX 11.00 (32 bit) compiled with gcc 3.4.2, I always get the error, "Debugging dynamic executables loaded via the hpux8 dld.sl is not supported." My multi-threaded program is crashing with a memory fault, and the core file yields nothing for me. Any ideas? Thanks.

Re: Problem debugging with gdb

Mike Stroyan — Mon, 25 Oct 2004 14:01:04 GMT

I suspect you have the wrong gdb.
Download wdb from http://www.hp.com/go/wdb
and then use /opt/langtools/bin/gdb.

Re: Problem debugging with gdb

Maribeth Romeo — Mon, 25 Oct 2004 15:01:43 GMT

I have the version that came with gcc 3.4.2. Why would that be the incorrect version?

Re: Problem debugging with gdb

ranganath ramachandra — Tue, 26 Oct 2004 03:31:12 GMT

this can happen even with new gdb if your program is corrupting the dynamic loader's data (this ,or the reason for this, may also be the reason for the crash).

if you could run your application from within gdb and reach upto some point such as main before crashing, at that point you could set a watchpoint on *__dld_list ("watch *(int *)__dld_list") and see who is writing to that address. that may give you a hint about where a possible bad pointer access is happening.

Re: Problem debugging with gdb

ranganath ramachandra — Tue, 26 Oct 2004 03:44:43 GMT

i think you will also need a watchpoint on __dld_list, set using the command "watch __dld_list".

Re: Problem debugging with gdb

Maribeth Romeo — Tue, 26 Oct 2004 08:24:15 GMT

When I try to do this I get the message, "Hardware watchpoint 2: {} 1090556040." This doesn't seem correct. When I run my program, it never stops there.

Re: Problem debugging with gdb

ranganath ramachandra — Thu, 28 Oct 2004 00:36:43 GMT

sorry, no more clues. perhaps you should contact the response center.