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List:       gdb-bugs
Subject:    Couldn't get registers: Operation not permitted.
From:       "Torin Ford" <TFord () venturipartners ! com>
Date:       2003-04-18 20:22:04
Message-ID: 755372879F556649B54EADD3F7EDE5318FB243 () pgamh02 ! venturipartners ! com
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Hey all,
   I'm currently attempting to work on a program that is a custom =
version of apache (httpd).  I'm using RedHat 9.0, so things are =
compiling with:

g++ (GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
Copyright (C) 2002 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 PARTICULAR =
PURPOSE.

gcc (GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
Copyright (C) 2002 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 PARTICULAR =
PURPOSE.

and linking with:

GNU ld version 2.13.90.0.18 20030206
Copyright 2002 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms =
of
the GNU General Public License.  This program has absolutely no =
warranty.

and debugging with:

GNU gdb Red Hat Linux (5.3post-0.20021129.18rh)
Copyright 2003 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you =
are
welcome to change it and/or distribute copies of it under certain =
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for =
details.
This GDB was configured as "i386-redhat-linux-gnu".

using glibc version:

GNU C Library stable release version 2.3.2, by Roland McGrath et al.
Copyright (C) 2003 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
PARTICULAR PURPOSE.
Compiled by GNU CC version 3.2.2 20030222 (Red Hat Linux 3.2.2-5).
Compiled on a Linux 2.4.20 system on 2003-04-07.
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.
        BIND-8.2.3-T5B
        NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
        Glibc-2.0 compatibility add-on by Cristian Gafton
        libthread_db work sponsored by Alpha Processor Inc
Report bugs using the `glibcbug' script to <bugs@gnu.org>.

running kernel:

2.4.20-9smp

The corresponding rpms would be:

binutils-2.13.90.0.18-9
gcc-3.2.2-5
gcc-c++-3.2.2-5
glibc-2.3.2-27.9
gdb-5.3post-0.20021129.18
kernel-smp-2.4.20-9

We have a custom apache module that ends up calling fork a lot.  Because =
of the NPTL changes in this version of glibc, our fork calls do not =
always return.  I decided to try debugging the program with gdb.  =
Everytime i do, I get "Couldn't get registers: Operation not permitted." =
immediately following a fork call:

(gdb) run
Starting program: /home/<user>/<dir path>/<program> -d /<dir path> -f =
/<dir path>/httpd.conf -DNO_DETACH -DONE_PROCESS -DDEBUG
[New Thread 16384 (LWP 21829)]
Couldn't get registers: Operation not permitted.
(gdb)

Once this happens, I cannot detach, kill the program or quit from the =
program.  I have to kill the gdb process and the program's processes =
from another terminal.  Our apache module is using C++ and is linked =
with numerous of our own libraries as well as numerous system libraries =
including libpthread, libgcc_s, libc and libstdc++.  Is this an apache =
problem, a gdb problem, a glibc problem or a problem with our own code?  =
The same code will compile and debug/run just fine on RedHat 8.0, SuSe =
8.0 and SuSe 8.1.  Any help would be greatly appreciated.

Thanks,

Torin


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