topic Coredump generated in Operating System - HP-UX

Coredump generated

Prashantj — Sat, 23 Oct 2010 06:23:02 GMT

Hi,

Core dump generated. Please advice.

OS: HP-UX 11.31

Error are as below : --

Core was generated by `httpd'.
Program terminated with signal 11, Segmentation fault.
SEGV_MAPERR - Address not mapped to object
#0 0x4044cb0:0 in ap_set_string_slot (cmd=0x7ffff1c0,
struct_ptr=, arg=0x40094f10 "text/plain") at config.c:1172
1172 *(const char **)((char *)struct_ptr + offset) = arg;
(gdb) bt
#0 0x4044cb0:0 in ap_set_string_slot (cmd=0x7ffff1c0,
struct_ptr=, arg=0x40094f10 "text/plain") at config.c:1172
warning: Attempting to unwind past bad PC 0x4044cb0
#1 0x4047860:0 in invoke_cmd (cmd=, parms=0x7ffff1c0,
mconfig=0x40051d18, args=0x4008bb7a "") at config.c:692
#2 0x4048360:0 in ap_walk_config (current=0x4008bb50, parms=0x7ffff1c0,
section_vector=0x40051c08) at config.c:1060
#3 0x4048670:0 in ap_process_config_tree (s=0x40051628, conftree=0x40053270,
p=0x40037248, ptemp=0x40065528) at config.c:1643
#4 0x4053d60:0 in main (argc=1074156840, argv=0x40035228) at main.c:557
(gdb) set heap-check on
(gdb) info corruption
Internal error : RTC gdb_shlib_info_count missing !

Prashant

Re: Coredump generated

Dennis Handly — Sat, 23 Oct 2010 08:58:58 GMT

What are you trying to do in ap_set_string_slot on line 1172 of config.c?
What version of gdb do you have?
What compiler version are you using?

Re: Coredump generated

Prashantj — Mon, 25 Oct 2010 04:23:22 GMT

Hi Dennis,

Sorry for the delay.

I am trying to install Apache we server. SAP not recommended to used inbuilt HP-UX Apache version. Hence I download httpd-2.0.63.tar from apache.org.
After executing make and make install command I fire ./apacheclt stop command and error as below.
# ./apachectl start
/usr/lib/hpux32/dld.so: Unable to find library 'libgcc_s.so.0'.
./apachectl[80]: 7602 Killed

So make a soft link to /opt/hp-gcc-4.4.3/lib/libgcc_s.so.0 to and executed # ./apachectl stop
# ./apachectl[80]: 18874 Memory fault(coredump)

EVENT LOG.
IVMBASE sent Event Monitor notification information:

/system/kernel_parameters/history will meet notification criteria when it is >= 100.000000.
Its initial value is 0.000000.

gdb Version
HP gdb 6.1 for HP Itanium (32 or 64 bit) and target HP-UX 11iv2 and 11iv3

Regards
Prashant

Re: Coredump generated

Dennis Handly — Mon, 25 Oct 2010 07:36:25 GMT

>So make a soft link to /opt/hp-gcc-4.4.3/lib/libgcc_s.so.0

Was your apache compiled with gcc 4.4.3?
Have you tried debugging httpd?

>set heap-check on

You need to do this before you start.

Re: Coredump generated

Prashantj — Mon, 25 Oct 2010 09:09:39 GMT

Hi Dennis,

Only three change did in conf file
user name, user group and port # 1080.

Prashant

Re: Coredump generated

Prashantj — Mon, 25 Oct 2010 09:12:05 GMT

it's /usr/sap/apache/conf/hpptd.conf

Prashant

Re: Coredump generated

Dennis Handly — Mon, 25 Oct 2010 09:29:11 GMT

>1172 *(const char**)((char*)struct_ptr + offset) = arg;

Either struct_ptr or the sum is bad or misaligned.

Re: Coredump generated

Prashantj — Mon, 25 Oct 2010 09:58:51 GMT

Hi Dennis,

Thanks.
Please advice what next? how i fix this isuue?

Prashant

Re: Coredump generated

Dennis Handly — Mon, 25 Oct 2010 18:22:54 GMT

>Please advice what next? how I fix this issue?

You need to find the values of struct_ptr and offset. Try in gdb:
(gdb) info reg
(gdb) disas $pc-16*12 $pc+16*2

Re: Coredump generated

Prashantj — Tue, 26 Oct 2010 04:22:30 GMT

Hi Dennis,

Please find the attached file.

Prashant

Re: Coredump generated

Dennis Handly — Tue, 26 Oct 2010 18:57:21 GMT

>Please find the attached file.
0x4044ca0:1 : addp4 r33=r33,r14
0x4044cb0:0 : st4 [r33]=r34 <<<<<
gr14: 0xc offset?
gr33: 0x40051d24

The value of r33 isn't swizzled properly. It appears the operands to the addp4 are reversed.
Try dropping the opt level for that one source file.

Re: Coredump generated

Prashantj — Fri, 29 Oct 2010 06:16:51 GMT

Hi Mr. Dennis,

Sorry for the delay.
Please describe the stapes to resolve the issue. how i drop the opt level.

Prashant

Re: Coredump generated

Dennis Handly — Fri, 29 Oct 2010 11:43:09 GMT

For your foreign devil gcc compiler, recompile with -O1 instead of -O.

Re: Coredump generated

Dennis Handly — Thu, 04 Nov 2010 04:02:01 GMT

What compiler options and gcc version did you use to compile config.c?

I tried gcc-4.4.3 and -O2 or -O3 and couldn't duplicate it.