NPTL patch for linux 2.4.28

[Syed Ahemed]

Hello all.
I have a tricky problem on  hand and a straight forward question.

Tricky problem:
---------------------
While debugging a simple multithreaded application using gdb linux
2.4.28 , i noticed the thread that has crashed after sigsegv has
complete information on the gdb (both  address and function at the
time of crash ) .But the other threads that are in wait state (
executing glibc functions at the time of crash ) just has the address
but not the function name as shown below.


sh-2.05b# ./gdb a.out /mnt/cf/engg_files/core_files/
a.out.1173437318.core.5312   a.out.1173453940.core.9829
a.out.1173438125.core.16016  lost+found
a.out.1173438881.core.18721
<f/engg_files/core_files/a.out.1173453940.core.9829
GNU gdb 6.3
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This GDB was configured as "i686-pc-linux-gnu"...Using host libthread_db library
"/lib/libthread_db.so.1".

warning: exec file is newer than core file.
Core was generated by `./a.out'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libpthread.so.0...done.
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /opt/lib/ld-linux.so.2...done.
Loaded symbols for /opt//lib/ld-linux.so.2
#0  0x080485df in a (p=0x0) at threadcore.c:34
34      threadcore.c: No such file or directory.
       in threadcore.c
(gdb) info threads
 3 process 10993  0x08053840 in ?? ()
 2 process 1267  0xbf5ff9d0 in ?? ()
* 1 process 9829  0x080485df in a (p=0x0) at threadcore.c:34
(gdb) thread 3
[Switching to thread 3 (process 10993)]#0  0x08053840 in ?? ()
(gdb) bt
#0  0x08053840 in ?? ()
Cannot access memory at address 0x2b
(gdb)
#0  0x08053840 in ?? ()
Cannot access memory at address 0x2b
(gdb) thread 1
[Switching to thread 1 (process 9829)]#0  0x080485df in a (p=0x0)
   at threadcore.c:34
34      in threadcore.c
(gdb) bt
#0  0x080485df in a (p=0x0) at threadcore.c:34
#1  0x080485bc in main () at threadcore.c:21
(gdb) thread 2
[Switching to thread 2 (process 1267)]#0  0xbf5ff9d0 in ?? ()
(gdb) bt
#0  0xbf5ff9d0 in ?? ()
Cannot access memory at address 0x2b
(gdb) q
sh-2.05b#


The problem is with the same glibc and gdb , Redhat 9 linux 2.4.20-8
does  give me complete information of all the threads in the "info
threads" command.
Having read similar problems on various mailing lists , i believe the
only difference is redhat 9 has patched its kernel with NTPL or
debugging support for linux in the kernel.

Wanted to confirm if it this correct .

My question
------------------

Someone would say move to 2.6 kernel and a different glibc,But with
custom applications at stake .I can't take that risk as yet .So i
would want an NTPL patch for 2.4.28 kernel
Where do i get it ? Please do respond .




Regards
--
Syed

I'm afraid that I've seen too many people fix bugs by looking at
debugger output, and that almost inevitably leads to fixing the
symptoms rather than the underlying problems.
	
--Linus
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