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Continuos php-fpm exited on signal 11

Posted by RedFoxy Darrest 
RedFoxy Darrest
Continuos php-fpm exited on signal 11
July 19, 2012 01:08PM
Hi all!
I've a Hp web server with Xeon E5504 2ghz and 8gb ram, with freebsd 8.2-p9
amd64, nginx 1.2.1, PHP 5.3.14, mysql 5.5.25, apc, memcached and other
package installed using freebsd ports.
Here you can see php-fpm conf http://pastebin.com/bFMwrYCs my php.ini
conf http://pastebin.com/HYMK7kP9 and my nginx fastcgi
conf http://pastebin.com/1cAFzu0p

My trouble are simple, I've a lot of "exited on signal 11" in
/var/log/messages and when php-fpm child die I've "502 gateway error" on my
website, that's really boring because I've a lot of that errors in a day,
in that php-fpm conf I've forced it to an heavy configuration with a 150 of
php-fpm's child in static mode, and pm.max_requests = 10000, but in my
php-fpm log I found:
[19-Jul-2012 18:58:14.666913] NOTICE: pid 84563, fpm_children_make(), line
421: [pool www] child 84717 started
[19-Jul-2012 18:58:14.666984] DEBUG: pid 84563, fpm_event_loop(), line 409:
event module triggered 1 events
[19-Jul-2012 18:58:17.403217] DEBUG: pid 84563, fpm_event_loop(), line 409:
event module triggered 2 events
[19-Jul-2012 18:58:17.407442] DEBUG: pid 84563, fpm_got_signal(), line 72:
received SIGCHLD
[19-Jul-2012 18:58:17.407552] WARNING: pid 84563, fpm_children_bury(), line
252: [pool www] child 84583 exited on signal 11 (SIGSEGV) after 39.849444
seconds from start

the time from start have a rage from 1 sec to 40 secs about, every time
that it kill his process I got errors "502 gateway errors", I tried to
increase pm.max_request until 5000000 but looks like I've not a really big
change...

Any ideas?
RedFoxy
Re: Continuos php-fpm exited on signal 11
July 19, 2012 01:34PM
Il giorno 19/lug/2012, alle ore 19:03, RedFoxy Darrest ha scritto:

> Hi all!
> I've a Hp web server with Xeon E5504 2ghz and 8gb ram, with freebsd 8.2-p9 amd64, nginx 1.2.1, PHP 5.3.14, mysql 5.5.25, apc, memcached and other package installed using freebsd ports.
> Here you can see php-fpm conf http://pastebin.com/bFMwrYCs my php.ini conf http://pastebin.com/HYMK7kP9 and my nginx fastcgi conf http://pastebin.com/1cAFzu0p

here a log of 17 mins: http://pastebin.com/7WTXSMTE

In that log you can see that:
19:00:12.633776 I started php-fpm with a new log file
19:04:24.734199 php-fpm change to a RELOADING state
19:07:18.188313 php-fpm change to a RELOADING state
19:17:37.400815 I stops php-fpm to send that log to you
Antony Dovgal
Re: Continuos php-fpm exited on signal 11
July 19, 2012 01:48PM
On 2012-07-19 21:03, RedFoxy Darrest wrote:
> Hi all!
> I've a Hp web server with Xeon E5504 2ghz and 8gb ram, with freebsd 8.2-p9 amd64, nginx 1.2.1,PHP 5.3.14, mysql 5.5.25, apc, memcached and other package installed using freebsd ports.
> Here you can see php-fpm conf http://pastebin.com/bFMwrYCs my php.ini conf http://pastebin.com/HYMK7kP9 and my nginx fastcgi conf http://pastebin.com/1cAFzu0p
>
> My trouble are simple, I've a lot of "exited on signal 11" in /var/log/messages and when php-fpm child die I've "502 gateway error" on my website, that's really boring because I've a lot of that errors in a day, in that php-fpm conf I've forced it to an heavy configuration with a 150 of php-fpm's child in static mode, and pm.max_requests = 10000, but in my php-fpm log I found:
> [19-Jul-2012 18:58:14.666913] NOTICE: pid 84563, fpm_children_make(), line 421: [pool www] child 84717 started
> [19-Jul-2012 18:58:14.666984] DEBUG: pid 84563, fpm_event_loop(), line 409: event module triggered 1 events
> [19-Jul-2012 18:58:17.403217] DEBUG: pid 84563, fpm_event_loop(), line 409: event module triggered 2 events
> [19-Jul-2012 18:58:17.407442] DEBUG: pid 84563, fpm_got_signal(), line 72: received SIGCHLD
> [19-Jul-2012 18:58:17.407552] WARNING: pid 84563, fpm_children_bury(), line 252: [pool www] child 84583 exited on signal 11 (SIGSEGV) after 39.849444 seconds from start
>
> the time from start have a rage from 1 sec to 40 secs about, every time that it kill his process I got errors "502 gateway errors", I tried to increase pm.max_request until 5000000 but looks like I've not a really big change...
>
> Any ideas?

Yeah, a backtrace would be nice to have:
https://bugs.php.net/bugs-generating-backtrace.php

--
Wbr,
Antony Dovgal
---
http://pinba.org - realtime profiling for PHP
RedFoxy
Re: Continuos php-fpm exited on signal 11
July 19, 2012 01:54PM
Il giorno 19/lug/2012, alle ore 19:47, Antony Dovgal ha scritto:

> Yeah, a backtrace would be nice to have:
> https://bugs.php.net/bugs-generating-backtrace.php

but it doesn't crash, I've no dumps about it, just php-fpm reloads/kill all child and runs it again
Antony Dovgal
Re: Continuos php-fpm exited on signal 11
July 19, 2012 02:02PM
On 2012-07-19 21:52, RedFoxy wrote:
>
> Il giorno 19/lug/2012, alle ore 19:47, Antony Dovgal ha scritto:
>
>> Yeah, a backtrace would be nice to have:
>> https://bugs.php.net/bugs-generating-backtrace.php
>
> but it doesn't crash, I've no dumps about it, just php-fpm reloads/kill all child and runs it again

Signal 11 means SEGFAULT, which means it does crash and you can get the core and the trace.

--
Wbr,
Antony Dovgal
---
http://pinba.org - realtime profiling for PHP
Re: Continuos php-fpm exited on signal 11
July 24, 2012 08:24AM
Hi!
I don't found any .core than I generated it using:

# gdb /usr/local/sbin/php-fpm

Before that, I compiled again my php 5.3.14 and all module, just to add the --enable-debug as suggested in the page, but I don't understand where are the troubles:

root@web1:/home/web# gdb /usr/local/sbin/php-fpm
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...
(gdb) run
Starting program: /usr/local/sbin/php-fpm
[New LWP 102217]
[New Thread 8018041c0 (LWP 102217)]

Program exited normally.
(gdb) stop

root@web1:/home/web# gdb /usr/local/sbin/php-fpm /home/web/php-fpm.core
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...
Core was generated by `php-fpm'.
Program terminated with signal 5, Trace/breakpoint trap.
Reading symbols from /lib/libcrypt.so.5...done.
Loaded symbols for /lib/libcrypt.so.5
Reading symbols from /usr/local/lib/libpcre.so.1...done.
Loaded symbols for /usr/local/lib/libpcre.so.1
Reading symbols from /lib/libm.so.5...done.
Loaded symbols for /lib/libm.so.5
Reading symbols from /usr/local/lib/libxml2.so.5...done.
Loaded symbols for /usr/local/lib/libxml2.so.5
Reading symbols from /lib/libz.so.5...done.
Loaded symbols for /lib/libz.so.5
Reading symbols from /usr/local/lib/libiconv.so.3...done.
Loaded symbols for /usr/local/lib/libiconv.so.3
Reading symbols from /lib/libthr.so.3...done.
Loaded symbols for /lib/libthr.so.3
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /usr/local/lib/php/20090626-debug/bcmath.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/bcmath.so
Reading symbols from /usr/local/lib/php/20090626-debug/bz2.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/bz2.so
Reading symbols from /usr/lib/libbz2.so.4...done.
Loaded symbols for /usr/lib/libbz2.so.4
Reading symbols from /usr/local/lib/php/20090626-debug/calendar.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/calendar.so
Reading symbols from /usr/local/lib/php/20090626-debug/ctype.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/ctype.so
Reading symbols from /usr/local/lib/php/20090626-debug/curl.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/curl.so
Reading symbols from /usr/local/lib/libcurl.so.6...done.
Loaded symbols for /usr/local/lib/libcurl.so.6
Reading symbols from /usr/lib/libssl.so.6...done.
Loaded symbols for /usr/lib/libssl.so.6
Reading symbols from /lib/libcrypto.so.6...done.
Loaded symbols for /lib/libcrypto.so.6
Reading symbols from /usr/local/lib/php/20090626-debug/dom.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/dom.so
Reading symbols from /usr/local/lib/php/20090626-debug/exif.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/exif.so
Reading symbols from /usr/local/lib/php/20090626-debug/fileinfo.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/fileinfo.so
Reading symbols from /usr/local/lib/php/20090626-debug/filter.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/filter.so
Reading symbols from /usr/local/lib/php/20090626-debug/ftp.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/ftp.so
Reading symbols from /usr/local/lib/php/20090626-debug/gd.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/gd.so
Reading symbols from /usr/local/lib/libt1.so.5...done.
Loaded symbols for /usr/local/lib/libt1.so.5
Reading symbols from /usr/local/lib/libfreetype.so.9...done.
Loaded symbols for /usr/local/lib/libfreetype.so.9
Reading symbols from /usr/local/lib/libX11.so.6...done.
Loaded symbols for /usr/local/lib/libX11.so.6
Reading symbols from /usr/local/lib/libXpm.so.4...done.
Loaded symbols for /usr/local/lib/libXpm.so.4
Reading symbols from /usr/local/lib/libpng15.so.15...done.
Loaded symbols for /usr/local/lib/libpng15.so.15
Reading symbols from /usr/local/lib/libjpeg.so.11...done.
Loaded symbols for /usr/local/lib/libjpeg.so.11
Reading symbols from /usr/local/lib/libxcb.so.2...done.
Loaded symbols for /usr/local/lib/libxcb.so.2
Reading symbols from /usr/local/lib/libXau.so.6...done.
Loaded symbols for /usr/local/lib/libXau.so.6
Reading symbols from /usr/local/lib/libXdmcp.so.6...done.
Loaded symbols for /usr/local/lib/libXdmcp.so.6
Reading symbols from /usr/local/lib/libpthread-stubs.so.0...done.
Loaded symbols for /usr/local/lib/libpthread-stubs.so.0
Reading symbols from /usr/lib/librpcsvc.so.5...done.
Loaded symbols for /usr/lib/librpcsvc.so.5
Reading symbols from /usr/local/lib/php/20090626-debug/gettext.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/gettext.so
Reading symbols from /usr/local/lib/libintl.so.9...done.
Loaded symbols for /usr/local/lib/libintl.so.9
Reading symbols from /usr/local/lib/php/20090626-debug/hash.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/hash.so
Reading symbols from /usr/local/lib/php/20090626-debug/iconv.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/iconv.so
Reading symbols from /usr/local/lib/php/20090626-debug/json.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/json.so
Reading symbols from /usr/local/lib/php/20090626-debug/mbstring.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/mbstring.so
Reading symbols from /usr/local/lib/libonig.so.1...done.
Loaded symbols for /usr/local/lib/libonig.so.1
Reading symbols from /usr/local/lib/php/20090626-debug/mcrypt.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/mcrypt.so
Reading symbols from /usr/local/lib/libmcrypt.so.8...done.
Loaded symbols for /usr/local/lib/libmcrypt.so.8
Reading symbols from /usr/local/lib/libltdl.so.7...done.
Loaded symbols for /usr/local/lib/libltdl.so.7
Reading symbols from /usr/local/lib/php/20090626-debug/mysql.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/mysql.so
Reading symbols from /usr/local/lib/php/20090626-debug/mysqli.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/mysqli.so
Reading symbols from /usr/local/lib/php/20090626-debug/openssl.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/openssl.so
Reading symbols from /usr/local/lib/php/20090626-debug/pdf.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/pdf.so
Reading symbols from /usr/local/lib/libpdf.so.6...done.
Loaded symbols for /usr/local/lib/libpdf.so.6
Reading symbols from /usr/local/lib/php/20090626-debug/pdo.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/pdo.so
Reading symbols from /usr/local/lib/php/20090626-debug/phar.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/phar.so
Reading symbols from /usr/local/lib/php/20090626-debug/posix.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/posix.so
Reading symbols from /usr/local/lib/php/20090626-debug/session.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/session.so
Reading symbols from /usr/local/lib/php/20090626-debug/shmop.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/shmop.so
Reading symbols from /usr/local/lib/php/20090626-debug/simplexml.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/simplexml.so
Reading symbols from /usr/local/lib/php/20090626-debug/soap.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/soap.so
Reading symbols from /usr/local/lib/php/20090626-debug/sockets.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/sockets.so
Reading symbols from /usr/local/lib/php/20090626-debug/sysvmsg.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/sysvmsg.so
Reading symbols from /usr/local/lib/php/20090626-debug/sysvsem.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/sysvsem.so
Reading symbols from /usr/local/lib/php/20090626-debug/sysvshm.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/sysvshm.so
Reading symbols from /usr/local/lib/php/20090626-debug/tokenizer.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/tokenizer.so
Reading symbols from /usr/local/lib/php/20090626-debug/xml.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/xml.so
Reading symbols from /usr/local/lib/php/20090626-debug/wddx.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/wddx.so
Reading symbols from /usr/local/lib/php/20090626-debug/xmlreader.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/xmlreader.so
Reading symbols from /usr/local/lib/php/20090626-debug/xmlrpc.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/xmlrpc.so
Reading symbols from /usr/local/lib/php/20090626-debug/xmlwriter.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/xmlwriter.so
Reading symbols from /usr/local/lib/php/20090626-debug/xsl.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/xsl.so
Reading symbols from /usr/local/lib/libexslt.so.8...done.
Loaded symbols for /usr/local/lib/libexslt.so.8
Reading symbols from /usr/local/lib/libxslt.so.2...done.
Loaded symbols for /usr/local/lib/libxslt.so.2
Reading symbols from /usr/local/lib/libgcrypt.so.18...done.
Loaded symbols for /usr/local/lib/libgcrypt.so.18
Reading symbols from /usr/local/lib/libgpg-error.so.0...done.
Loaded symbols for /usr/local/lib/libgpg-error.so.0
Reading symbols from /usr/local/lib/php/20090626-debug/zip.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/zip.so
Reading symbols from /usr/local/lib/php/20090626-debug/zlib.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/zlib.so
Reading symbols from /usr/local/lib/php/20090626-debug/apc.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/apc.so
Reading symbols from /usr/lib/librt.so.1...done.
Loaded symbols for /usr/lib/librt.so.1
Reading symbols from /usr/local/lib/php/20090626-debug/memcache.so...done.
Loaded symbols for /usr/local/lib/php/20090626-debug/memcache.so
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0 0x00000008008ff101 in r_debug_state () from /libexec/ld-elf.so.1
[New Thread 8018041c0 (LWP 101412)]
(gdb) bt
#0 0x00000008008ff101 in r_debug_state () from /libexec/ld-elf.so.1
#1 0x0000000800902ed4 in dlclose () from /libexec/ld-elf.so.1
#2 0x000000000061cdb2 in module_destructor (module=0x8018877c0) at /usr/ports/lang/php53/work/php-5.3.14/Zend/zend_API.c:2141
#3 0x00000000006249e1 in zend_hash_apply_deleter (ht=0x94b2e0, p=0x80195ddd0) at /usr/ports/lang/php53/work/php-5.3.14/Zend/zend_hash.c:814
#4 0x0000000000624b5a in zend_hash_graceful_reverse_destroy (ht=0x94b2e0) at /usr/ports/lang/php53/work/php-5.3.14/Zend/zend_hash.c:850
#5 0x00000000006126c8 in zend_shutdown () at /usr/ports/lang/php53/work/php-5.3.14/Zend/zend.c:831
#6 0x0000000000599ced in php_module_shutdown () at /usr/ports/lang/php53/work/php-5.3.14/main/main.c:2201
#7 0x0000000000714724 in fpm_php_cleanup (which=8, arg=0x0) at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_php.c:199
#8 0x0000000000709be7 in fpm_cleanups_run (type=8) at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_cleanup.c:45
#9 0x000000000071547c in fpm_pctl_exec () at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_process_ctl.c:100
#10 0x00000000007154ef in fpm_pctl_action_last () at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_process_ctl.c:111
#11 0x0000000000715840 in fpm_pctl (new_state=0, action=2) at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_process_ctl.c:238
#12 0x00000000007158a5 in fpm_pctl_child_exited () at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_process_ctl.c:258
#13 0x00000000007092e4 in fpm_children_bury () at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_children.c:259
#14 0x000000000070ea42 in fpm_got_signal (ev=0x944920, which=2, arg=0x0) at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_events.c:73
#15 0x000000000070f913 in fpm_event_fire (ev=0x944920) at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_events.c:455
#16 0x000000000071ca98 in fpm_event_kqueue_wait (queue=0x806f3dfa0, timeout=984) at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/events/kqueue.c:146
#17 0x000000000070f671 in fpm_event_loop (err=0) at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_events.c:401
#18 0x0000000000708bb6 in fpm_run (max_requests=0x7fffffffea6c) at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm.c:110
#19 0x0000000000713cec in main (argc=1, argv=0x7fffffffebf0) at /usr/ports/lang/php53/work/php-5.3.14/sapi/fpm/fpm/fpm_main.c:1778
(gdb)
Re: Continuos php-fpm exited on signal 11
July 24, 2012 08:25AM
I tried to use the original php.ini and php-fpm.conf files but nothing change
Re: Continuos php-fpm exited on signal 11
July 24, 2012 10:30AM
I generate a new php-fpm.core and now I've an error: Cannot access memory at address 0x800000000000

full log here: http://pastebin.com/YGZ5u3gT
Re: Continuos php-fpm exited on signal 11
July 25, 2012 09:09AM
I've disabled APC and update to 5.3.15 now looks good, only a single "signal 11" in over 8 hour
Re: Continuos php-fpm exited on signal 11
August 06, 2012 11:12PM
Hi.

On Fri, Jul 20, 2012 at 12:01 AM, Antony Dovgal <tony@daylessday.org> wrote:

>
> Signal 11 means SEGFAULT, which means it does crash and you can get the
> core and the trace.
>
>
Actually, I have same situation - some sig11 but no cores left. Althought
this system is able to produce cores, but not with the php-fpm. FreeBSD
too, yeah.

Eugene.
Re: Continuos php-fpm exited on signal 11
June 05, 2016 07:15PM
I know this is an ancient topic, but it had happened to me recently, so I might throw in my .02 —

Excluding programming errors — which ought to leave at least some clue on the logs and/or dump core — there seem to be two main reasons for this to happen, especially if it doesn't happen *all* the time, just frequently enough to be annoying, but hard enough to troubleshoot.

The first possible solution has to do with session files. If somehow the directory where they ought to be stored (session.save_path = "/var/lib/php/sessions", by default) is not writable, then php_fpm will segfault (note: 'not writable' might mean a lot of possible issues, from wrong permissions/ownership, wrong user/group running php_fpm, or, more obscurely, hitting inode limits on the filesystem where the save_path directory is mounted...). This is usually easy to fix — just check and re-check if the directory has all the permissions for the correct user; if it's full of session files, it's possible that the PHP garbage collector is not running; you can delete everything and see if it helps, or move the directory to a different mount point, etc.

The second possible solution is even more cryptical and obscure, and is tied to bad/buggy extensions. The original poster mentions that he uses apc and memcache. Trying to run without either of those extensions is a possibility (in my own case, it was the extension installed by New Relic that caused the problem). What usually happens in these cases is that those extensions sometimes hit some kind of limit (or have a bug which does not manifest itself all the time, and has eluded the testers), they segfault and bring the php-fpm process down with them — leaving no traces on logs, no core files around, nothing but the annoying 'child XXX exited on signal 11', making it very hard to debug, especially because it does not happen *always*...

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