Re: Segmentation fault (Apache Users)

On Wed, 9 Mar 2022 at 11:13, Frank Gingras <thumbs@xxxxxxxxxx> wrote:

Hello,

A mod_php segfault is most likely linked to a php extension.

You have two options here:

1) Unload each php extension until you find the culprit

2) Switch to php-fpm, and configure httpd to use the event mpm via proxy_fcgi to pass the requests to php-fpm

On Wed, 9 Mar 2022 at 08:15, Ivan Ionut <ivan.ionut@xxxxxxxxxxxxxx> wrote:

My apache2 version:

Server version: Apache/2.4.18 (Ubuntu)
Server built: 2020-08-12T21:35:50

My php version:

PHP 7.3.7-1+ubuntu16.04.1+deb.sury.org+1 (cli) (built: Jul 10 2019 06:54:26) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.7, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.3.7-1+ubuntu16.04.1+deb.sury.org+1, Copyright (c) 1999-2018, by Zend Technologies

My os version:

Distributor ID: Ubuntu
Description: Ubuntu 16.04.6 LTS
Release: 16.04
Codename: xenial

Hi, from last 2-3 months i have a lot of these segmentations(2-3 times per week);

[Wed Mar 09 10:47:12.150226 2022] [core:notice] [pid 21823] AH00051: child pid 22481 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Wed Mar 09 10:47:17.155792 2022] [core:notice] [pid 21823] AH00051: child pid 21895 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Wed Mar 09 10:47:24.163536 2022] [core:notice] [pid 21823] AH00051: child pid 22189 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Wed Mar 09 10:47:24.163618 2022] [core:notice] [pid 21823] AH00051: child pid 22562 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Wed Mar 09 10:47:25.164759 2022] [core:notice] [pid 21823] AH00051: child pid 22491 exit

...............

Every site on the server has an error with: "Secure Connection Failed" or "The Connection was reset"

After I restart apache2 everything is ok.

Before this error.. I had a lot of errors (that I do not remember the exact log messages) ... the apache2 requested to increase the number of servers/workers, so the only I made some modifications

/etc/apache2/mods-available/mpm_prefork.conf

<IfModule mpm_prefork_module>
ServerLimit 4000
StartServers 905
MinSpareServers 405
MaxSpareServers 420
MaxRequestWorkers 2000
MaxConnectionsPerChild 0
</IfModule>

Today with some tutorial and with the help of gdb... I did get some output of a segmentated apache2 process:

#0 0xb6324467 in ?? () from /usr/lib/php/20180731/opcache.so
No symbol table info available.
#1 0xb6322eac in ?? () from /usr/lib/php/20180731/opcache.so
No symbol table info available.
#2 0xb716baba in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#3 0xb71a4b92 in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#4 0xb71adaf3 in execute_ex () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#5 0xb71112cd in zend_call_function () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#6 0xb6fbffbf in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#7 0xb6fc1345 in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#8 0xb6fc154a in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#9 0xb6fc1b2a in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#10 0xb71a9f11 in execute_ex () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#11 0xb71112cd in zend_call_function () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#12 0xb6fbffbf in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#13 0xb6fc1345 in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#14 0xb6fc154a in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#15 0xb6fc1b2a in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#16 0xb71a9f11 in execute_ex () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#17 0xb71112cd in zend_call_function () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#18 0xb6fbffbf in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#19 0xb6fc1345 in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#20 0xb6fc154a in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#21 0xb6fc1b2a in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#22 0xb71a9f11 in execute_ex () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#23 0xb71112cd in zend_call_function () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#24 0xb6fbffbf in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#25 0xb6fc1345 in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#26 0xb6fc154a in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#27 0xb6fc1b2a in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#28 0xb71a9f11 in execute_ex () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#29 0xb71b22e4 in zend_execute () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#30 0xb711f5cd in zend_execute_scripts () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#31 0xb70bd52c in php_execute_script () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#32 0xb71b4729 in ?? () from /usr/lib/apache2/modules/libphp7.3.so
No symbol table info available.
#33 0x00545f27 in ap_run_handler (r=0xb0611058) at config.c:169
       pHook = <optimized out>
       n = 3
       rv = -1
#34 0x0054649f in ap_invoke_handler (r=0xb0611058) at config.c:433
       handler = <optimized out>
       p = <optimized out>
       result = <optimized out>
       old_handler = 0xb48f4258 "application/x-httpd-php"
       ignore = <optimized out>
#35 0x0055d5ff in ap_process_async_request (r=0xb0611058) at http_request.c:410
       c = 0xb62f31f0
       access_status = 0
#36 0x0055d7af in ap_process_request (r=0xb0611058) at http_request.c:445
       bb = <optimized out>
       b = <optimized out>
       c = 0xb62f31f0
       rv = <optimized out>
#37 0x0055989f in ap_process_http_sync_connection (c=0xb62f31f0) at http_core.c:210
       keep_alive_timeout = 5000000
       r = 0xb0611058
       csd = 0x0
       mpm_state = 0
#38 ap_process_http_connection (c=0xb62f31f0) at http_core.c:251
No locals.
#39 0x0054fd17 in ap_run_process_connection (c=0xb62f31f0) at connection.c:41
       pHook = <optimized out>
       n = 1
       rv = -1
#40 0x00550183 in ap_process_connection (c=0xb62f31f0, csd=0xb62f3058) at connection.c:213
       rc = <optimized out>
#41 0xb732ca8f in child_main (child_num_arg=child_num_arg@entry=649,       child_bucket=child_bucket@entry=0) at prefork.c:723
       current_conn = 0xb62f31f0
       csd = 0xb62f3058
       thd = 0xb6eff058
       osthd = 3074316032
       ptrans = 0xb62f3018
       allocator = 0x1b435d0
       status = <optimized out>
       i = <optimized out>
       lr = <optimized out>
       pollset = 0xb6eff0c8
       sbh = 0xb6eff0c0
       bucket_alloc = 0xb6200018
       last_poll_idx = 1
       lockfile = <optimized out>
#42 0xb732ccd3 in make_child (s=<optimized out>, slot=slot@entry=649) at prefork.c:825
       bucket = 0
       pid = <optimized out>
#43 0xb732cd47 in startup_children (number_to_start=256, number_to_start@entry=905) at prefork.c:843
       i = 649
#44 0xb732dced in prefork_run (_pconf=0xb76fe018, plog=0xb73bf018, s=0xb73c3f18) at prefork.c:1006
       index = <optimized out>
       remaining_children_to_start = 905
       i = <optimized out>
#45 0x0052826f in ap_run_mpm (pconf=0xb76fe018, plog=0xb73bf018, s=0xb73c3f18) at mpm_common.c:94
       pHook = <optimized out>
       n = 0
       rv = -1
#46 0x00520da3 in main (argc=3, argv=0xbfa0f494) at main.c:777
       c = 0 '\000'
       showcompile = <optimized out>
       showdirectives = <optimized out>
       confname = <optimized out>
       def_server_root = <optimized out>
       temp_error_log = <optimized out>
       error = <optimized out>
       process = 0xb76fe018
       pconf = <optimized out>
       plog = 0xb73bf018
       ptemp = 0xb73c1018
       pcommands = 0xb73c5018
       opt = 0xb73c50b8
       rv = <optimized out>
       mod = <optimized out>
       opt_arg = 0x4fd034 "\006"
       signal_server = <optimized out>

P.S Sorry for my english.

--

Ivan Ionuț

Str. Săliște 20, Galati 800023

Tel/Fax: +40236 493277

Email: ivan.ionut@xxxxxxxxxxxxxx

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