From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020408

Description of problem:
The dynamic loader stores an unmapped address in the GOT entry of a symbol of a
dependency library of a dlopened library.

Version-Release number of selected component (if applicable):
2.2.5-32

How reproducible:
Always

Steps to Reproduce:
The following program, that worked fine on 7.2, fails on skipjack-beta2 + all
RHN updates published on and before 2002-04-12.

% cat t.c
#include <SDL/SDL.h>

int main() {
  SDL_Init(16);
}
% gcc t.c -g -lSDL -lpthread
% gdb ./a.out
[snip]
(gdb) run
Program received signal SIGSEGV, Segmentation fault.
0x400a40c7 in pthread_mutex_lock () from /lib/i686/libpthread.so.0
(gdb) disass $pc $pc+1
Dump of assembler code from 0x400a40c7 to 0x400a40c8:
0x400a40c7 <pthread_mutex_lock+23>:	mov    0xc(%edi),%eax
End of assembler dump.
(gdb) p /x $edi
$1 = 0x40025080
(gdb) p /x *(void**)($ebp+8)
$2 = 0x40025080
(gdb) up
#1  0x404283f8 in __tcf_0 () from /usr/lib/libmcop.so.1
(gdb) b __tcf_0
Breakpoint 1 at 0x40428396
(gdb) run
[...]
Breakpoint 1, 0x40428396 in __tcf_0 () from /usr/lib/libmcop.so.1
(gdb) until *0x404283e9
0x404283e9 in __tcf_0 () from /usr/lib/libmcop.so.1
(gdb) disass $pc $pc+16
Dump of assembler code from 0x404283e9 to 0x404283f9:
0x404283e9 <__tcf_0+89>:	mov    0x1338(%ebx),%eax
0x404283ef <__tcf_0+95>:	push   %eax
0x404283f0 <__tcf_0+96>:	mov    %eax,0xffffffec(%ebp)
0x404283f3 <__tcf_0+99>:	call   0x403d5d2c <_init+6216>
0x404283f8 <__tcf_0+104>:	pop    %eax
End of assembler dump.
(gdb) p /x $ebx
$3 = 0x4045ec04
(gdb) p /x $ebx+0x1338
$4 = 0x4045ff3c
(gdb) p *(void**)$
$5 = (void *) 0x40025080
(gdb) p *(void**)$
Cannot access memory at address 0x40025080
[how come the dynamic loader set up the GOT pointing at an invalid address?]
(gdb) info shar
From        To          Syms Read   Shared Object Library
0x400354c0  0x40079390  Yes         /usr/lib/libSDL-1.2.so.0
0x400a1410  0x400a93c0  Yes         /lib/i686/libpthread.so.0
0x420172d0  0x421166b0  Yes         /lib/i686/libc.so.6
0x400b4760  0x400cd1e0  Yes         /lib/i686/libm.so.6
0x400e40a0  0x4014bbb0  Yes         /usr/X11R6/lib/libX11.so.6
0x401aa8e0  0x401b3b40  Yes         /usr/X11R6/lib/libXext.so.6
0x401b5d40  0x401b6b50  Yes         /lib/libdl.so.2
0x40000a50  0x40010d20  Yes         /lib/ld-linux.so.2
0x40015310  0x40018b10  Yes         /usr/lib/libartsc.so
0x401e7a10  0x4025ce40  Yes         /usr/lib/libartsflow.so.1
0x402a9c30  0x402d0ef0  Yes         /usr/lib/libsoundserver_idl.so.1
0x402ec3d0  0x40308040  Yes         /usr/lib/libkmedia2_idl.so.1
0x40317020  0x4032aa90  Yes         /usr/lib/libaudiofile.so.0
0x40352500  0x40393d40  Yes         /usr/lib/libartsflow_idl.so.1
0x403d7580  0x40451c70  Yes         /usr/lib/libmcop.so.1
0x40478710  0x40482e40  Yes         /lib/libresolv.so.2
0x4049f5d0  0x404bdf00  Yes         /usr/lib/libstdc++-libc6.2-2.so.3
0x404cbd00  0x404d2e30  Yes         /lib/libnss_files.so.2
0x4001bcc0  0x4001eff0  Yes         /usr/lib/libesd.so.0
(gdb) b _dl_relocate_object_internal
Breakpoint 2 at 0x40008c7a
(gdb) ign 2 1
(gdb) run
[...]
Breakpoint 2, 0x40008c7a in _dl_relocate_object_internal ()
   from /lib/ld-linux.so.2
(gdb) p *(void**)$4
$6 = (void *) 0x0
(gdb) watch *(void**)$4
Hardware watchpoint 3: *(void **) $6
(gdb) dis 2
(gdb) c
Continuing.
Hardware watchpoint 3: *(void **) $6

Old value = (void *) 0x0
New value = (void *) 0x40025080
0x400099a8 in _dl_relocate_object_internal () from /lib/ld-linux.so.2
(gdb) shell objdump -h /usr/lib/libmcop.so.1 | fgrep .got
 17 .got          00001458  000bfc04  000bfc04  000bec04  2**2
(gdb) p /x 0xbfc04 + 0x1338
$7 = 0xc0f3c
(gdb) shell objdump -R /usr/lib/libmcop.so.1 | fgrep c0f3c
000c0f3c R_386_GLOB_DAT    _t24__default_alloc_template2b1i0._S_node_allocator_lock
(gdb) shell nm /usr/lib/libmcop.so.1 | fgrep
_t24__default_alloc_template2b1i0._S_node_allocator_lock
000bd620 V _t24__default_alloc_template2b1i0._S_node_allocator_lock

libargsflow, libartsflow_idl, libsoundserver_idl and libkmedia2_idl
also contain similar definitions of this symbol.