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Debugging 32-bit code on opteron gives false segfault?
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Joined: 30 Jun 2004
Posts: 6738
Location: The Portland Group Inc.

PostPosted: Thu Mar 03, 2005 1:25 pm    Post subject: Reply with quote

Hi Mark,

I must appolgize for my late reply. Our Fedora Core 2 system went down a few weeks ago and our IT just got it back up.

In comparing the output you sent with our FC2 system, the only difference I see is the build date for the linux kernel. The version is the same but the build date on ours is '2004-05-11'. This may or may not be significant, I'm not really sure.

What I'd like to do is wait a few weeks until the 6.0 release is out and then try again. If this doesn't work then I'll have our IT update our Fedora Core 2 to match yours and we'll investigate further. However, the 6.0 version will most likely take care of the problem.

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Joined: 24 Mar 2006
Posts: 1

PostPosted: Fri Mar 24, 2006 8:33 am    Post subject: Reply with quote


I just started using pgdbg today, but I appear to be having exactly the same problem as above. However, I am using the newest version (I believe). Here's the message I get when I start the debugger:

$ debugt num7.txt

PGDBG 6.1-3 x86 (Workstation, 4 CPU)
Copyright 1989-2000, The Portland Group, Inc. All Rights Reserved.
Copyright 2000-2005, STMicroelectronics, Inc. All Rights Reserved.
***Reading DWARFv2 Information.
Loaded: /mach2_debug/m2trk/m2

pgdbg> r
Signalled SIGSEGV at 0x44b950, function _dl_debug_state
44b950: 55 pushl %ebp

The output from /lib/ is

GNU C Library stable release version 2.3.5, by Roland McGrath et al.
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
Compiled by GNU CC version 3.4.3 20050227 (Red Hat 3.4.3-22).
Compiled on a Linux 2.4.20 system on 2005-04-07.
Available extensions:
GNU libio by Per Bothner
crypt add-on version 2.1 by Michael Glad and others
linuxthreads-0.10 by Xavier Leroy
The C stubs add-on version 2.1.2.
NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
Glibc-2.0 compatibility add-on by Cristian Gafton
GNU Libidn by Simon Josefsson
libthread_db work sponsored by Alpha Processor Inc
Thread-local storage support included.
For bug reporting instructions, please see:

And uname -a gives

2.6.10-1.770_FC3smp #1 SMP Thu Feb 24 18:36:43 EST 2005 x86_64 x86_64 x86_64 GNU/Linux

Is there any fix for this problem?
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