Re: How to debug " AH00051: child pid 31929 exit signal Segmentation fault (11), possible coredump in /apps/httpd2.4"? (Apache Users)

I have been encountering a problem trying to work with the core dump file.

After I decompress the lz4 file and then try to use gdb (gdb /apps/httpd2.5/bin/httpd <core file>), I am getting an error msg in GDG:

Reading symbols from /apps/httpd2.4/bin/httpd...done.
"/var/lib/systemd/coredump/core.httpd.1001.9e14cb0299404a82a8df5c73ceab0e83.53762.1739305624000000" is not a core dump: file truncated

If I run 'file' on the core file I get:

[root@localhost coredump]# file /tmp/core.31929
/tmp/core.31929: ERROR: ELF 64-bit LSB core file, x86-64, version 1 (SYSV) error reading (Invalid argument)

Does anyone know what might be causing this?

I even worked with one of my colleagues and we tried increasing limits, etc., but to no avail.

Thanks!

Jim

On Tue, Feb 11, 2025 at 8:30 AM o haya <ohaya1001@xxxxxxxxx> wrote:

Ahh... so something like this?

gdb /apps/httpd2.4/bin/httpd -c /tmp/core.31929
.
.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /apps/httpd2.4/bin/httpd...done.
"/tmp/core.31929" is not a core dump: file truncated

Do you know why it is it saying it isn't a core dump?

Virus-free.www.avast.com

On Tue, Feb 11, 2025 at 8:18 AM Eric Covener <covener@xxxxxxxxx> wrote:
No, you're expected to extract it and look at it with gdb.

On Tue, Feb 11, 2025 at 8:17 AM o haya <ohaya1001@xxxxxxxxx> wrote:
>
> Here's an example of the coredumpctl - is the the only info that the coredump can provide?
> [root@localhost coredump]# coredumpctl dump 31929 --output /tmp/core.31929
> PID: 31929 (httpd)
> UID: 1001 (orcladmin)
> GID: 1001 (orcladmin)
> Signal: 11 (SEGV)
> Timestamp: Tue 2025-02-11 06:54:34 EST (1h 20min ago)
> Command Line: /apps/httpd2.4/bin/httpd -k start
> Executable: /apps/httpd2.4/bin/httpd
> Control Group: /
> Slice: -.slice
> Boot ID: 9e14cb0299404a82a8df5c73ceab0e83
> Machine ID: f12d5da85f9443838815a7764fc748c0
> Hostname: localhost.localdomain
> Storage: /var/lib/systemd/coredump/core.httpd.1001.9e14cb0299404a82a8df5c73ceab0e83.31929.1739274874000000.lz4 (truncated)
> Message: Process 31929 (httpd) of user 1001 dumped core.
>
> Virus-free.www.avast.com
>
> On Tue, Feb 11, 2025 at 7:56 AM Eric Covener <covener@xxxxxxxxx> wrote:
>>
>> coredumpctl list and confirm it has an entry for the affected PID
>>
>> Extract the core file to a location with enough space: coredumpctl dump $PID --output /tmp/core.$PID

--
Eric Covener
covener@xxxxxxxxx