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From Greg Ames <>
Subject weird dump on daedalus
Date Fri, 07 Dec 2001 21:54:51 GMT /usr/local/apache2_0_28/corefiles/httpd.core.1 

#0  0x281b53ed in cgi_handler (r=0x816103c) at mod_cgi.c:547
547         if(strcmp(r->handler,CGI_MAGIC_TYPE) &&
548             return DECLINED

we executed this statement millions of times since this build went into
production with only this one problem.  The r looks fine in the dump; so
does r->handler:

(gdb) p r->handler
$7 = 0x817b714 "image/gif"

the other fields involved are constants.

But check this out:

Core was generated by `httpd'.
Program terminated with signal 10, Bus error.

I think that's trying to tell us something, but I don't know what. 



gory details

(gdb) p r->the_request
$8 = 0x81617fc "GET /tomcat/tomcat-3.2-doc/uguide/images/banner.gif
(gdb) p r->hostname
$9 = 0x8161bfc ""
(gdb) p r->filename
$10 = 0x8161f0c

a static file which serves just fine plugged into my browser.  About as
simple as you can get.

(gdb) bt
#0  0x281b53ed in cgi_handler (r=0x816103c) at mod_cgi.c:547
#1  0x80630bf in ap_run_handler (r=0x816103c) at config.c:185
#2  0x8063657 in ap_invoke_handler (r=0x816103c) at config.c:344
#3  0x8060725 in ap_process_request (r=0x816103c) at http_request.c:286
#4  0x805c49a in ap_process_http_connection (c=0x812510c) at
#5  0x806b66f in ap_run_process_connection (c=0x812510c) at
#6  0x806b82d in ap_process_connection (c=0x812510c) at connection.c:219
#7  0x8061cb4 in child_main (child_num_arg=130) at prefork.c:803
#8  0x8061e0a in make_child (s=0x8095974, slot=130) at prefork.c:890
#9  0x806205d in perform_idle_server_maintenance (p=0x809500c)
    at prefork.c:1031
#10 0x8062422 in ap_mpm_run (_pconf=0x809500c, plog=0x80ce00c,
    at prefork.c:1210
#11 0x8067681 in main (argc=1, argv=0xbfbffb5c) at main.c:432
#12 0x805c065 in _start ()

(gdb) info line 547
Line 547 of "mod_cgi.c" starts at address 0x281b53c0 <cgi_handler+108>
   and ends at 0x281b53f1 <cgi_handler+157>.
(gdb) disass cgi_handler+108 cgi_handler+157
Dump of assembler code from 0x281b53c0 to 0x281b53f1:
0x281b53c0 <cgi_handler+108>:   mov    0x8(%ebp),%ecx
0x281b53c3 <cgi_handler+111>:   mov    0xbc(%ecx),%eax
0x281b53c9 <cgi_handler+117>:   mov    %eax,%esi
0x281b53cb <cgi_handler+119>:   lea    0xffffebbb(%ebx),%edi
0x281b53d1 <cgi_handler+125>:   mov    $0x18,%ecx
0x281b53d6 <cgi_handler+130>:   cld
0x281b53d7 <cgi_handler+131>:   test   $0x0,%al
0x281b53d9 <cgi_handler+133>:   repz cmpsb %es:(%edi),%ds:(%esi)
0x281b53db <cgi_handler+135>:   je     0x281b53fc <cgi_handler+168>
0x281b53dd <cgi_handler+137>:   mov    %eax,%esi
0x281b53df <cgi_handler+139>:   lea    0xffffe97e(%ebx),%edi
0x281b53e5 <cgi_handler+145>:   mov    $0xb,%ecx
0x281b53ea <cgi_handler+150>:   cld
0x281b53eb <cgi_handler+151>:   test   $0x0,%al
0x281b53ed <cgi_handler+153>:   repz cmpsb %es:(%edi),%ds:(%esi)
0x281b53ef <cgi_handler+155>:   je     0x281b53fc <cgi_handler+168>
End of assembler dump.
(gdb) info registers
eax            0x817b714        135771924
ecx            0xb      11
edx            0x0      0
ebx            0xffffebbb       -5189
esp            0xbfbf9750       0xbfbf9750
ebp            0xbfbfd7b8       0xbfbfd7b8
esi            0x817b714        135771924          <== same as
edi            0xffffd539       -10951
eip            0x281b53ed       0x281b53ed
eflags         0x10246  66118
cs             0x1f     31
ss             0x2f     47
ds             0xbfbf002f       -1078001617
es             0x811002f        135331887
fs             0xbfbf002f       -1078001617
gs             0x2f     47

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