Re: threads/1154: gdb-5.3 + glibc-2.3.2 fail for my multithreaded program

["Justin Lee" <justin_lee at ud dot com>]

The following reply was made to PR threads/1154; it has been noted by GNATS.

From: "Justin Lee" <justin_lee@ud.com>
To: <gdb-gnats@sources.redhat.com>,
	<nobody@sources.redhat.com>,
	<mat@lcs.mit.edu>,
	<gdb-prs@sources.redhat.com>
Cc:  
Subject: Re: threads/1154: gdb-5.3 + glibc-2.3.2 fail for my multithreaded program
Date: Wed, 21 May 2003 18:41:42 -0500

 http://sources.redhat.com/cgi-bin/gnatsweb.pl?cmd=3Dview%20audit-trail&da=
 tabase=3Dgdb&pr=3D1154
 
 I have encountered almost this exact problem on a dual P4 Xeon box.  On =
 this box, hyperthreading is disabled.  Here is some version info:
 
 bmltdb201:/tmp$ uname -a
 Linux bmltdb201.corp.ud.com 2.4.20-13.7smp #1 SMP Mon May 12 12:31:27 =
 EDT 2003 i686 unknown
 
 
 bmltdb201:/tmp$ gcc -v
 Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.1/specs
 Configured with: ../configure --prefix=3D/usr --mandir=3D/usr/share/man =
 --infodir=3D/usr/share/info --enable-shared --enable-threads=3Dposix =
 --disable-checking --with-system-zlib --enable-__cxa_atexit =
 --host=3Di386-redhat-linux
 Thread model: posix
 gcc version 3.2.1 20021125 (Red Hat Linux 8.0 3.2.1-1)
 
 
 bmltdb201:/tmp$ gdb -v
 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".
 
 
 bmltdb201:/tmp$ ls -l /lib/i686/libc*
 -rwxr-xr-x    1 root     root      1374147 Nov  8  2002 =
 /lib/i686/libc-2.3.1.so*
 lrwxrwxrwx    1 root     root           13 Apr 29 22:59 =
 /lib/i686/libc.so.6 -> libc-2.3.1.so*
 
 Note in particular this is glibc 2.3.1, which is not the same as =
 mat@lcs.mit.edu's 2.3.2.  The triggering factor appeared to be when I =
 upgraded from kernel 2.4.9 to 2.4.20.  My specific problem is that I =
 cannot attach to one of our large multithreaded programs:
 
 bmltdb201:/tmp$ sudo gdb /usr/local/UD/services/dispatch/dispatch 5185
 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"...
 Attaching to program: /usr/local/UD/services/dispatch/dispatch, process =
 5185
 Couldn't get registers: Operation not permitted.
 A program is being debugged already.  Kill it? (y or n)
 
 Note that I can confirm that I am not using NPTL because my programs all =
 have the manager thread from the original LinuxThreads implementation.
 
 A simpler program that just creates a couple of threads works fine, its =
 just this more complicated program.  I'm not sure if this helps at all, =
 but I thought I'd report it.
 
 Also, on the last update, I saw this:
 
 Fixed by a replacement Red Hat errata package.
 
 but I don't see a mention of that anywhere else.  What errata package?
 
 Thanks,
 Justin Lee