php-fpm hanging: segfault, SIGSEGV - CPUs 100%

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php-fpm hanging: segfault, SIGSEGV - CPUs 100%

Martin crysman Zahradník
Hello,

today owncloud webserver got too slow to even log-in. I did SSH and checked htop (top) - 100% CPU, load average around 23 (!)

OK, that is bad.

So I checked some log files and found this:

⚡ cat /var/log/messages | grep -i err | tail
Jul 21 13:28:32 cloud kernel: [ 5035.723242] php5-fpm[16002]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]
Jul 21 13:28:45 cloud kernel: [ 5048.958776] php5-fpm[16032]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]
Jul 21 13:28:47 cloud kernel: [ 5050.946225] php5-fpm[16033]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]
Jul 21 13:28:51 cloud kernel: [ 5055.286449] php5-fpm[16034]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]
Jul 21 13:28:56 cloud kernel: [ 5059.719135] php5-fpm[16062]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]
Jul 21 13:29:09 cloud kernel: [ 5073.420829] php5-fpm[16102]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]
Jul 21 13:29:15 cloud kernel: [ 5079.317363] php5-fpm[16114]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]
Jul 21 13:29:24 cloud kernel: [ 5087.786983] php5-fpm[16145]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]
Jul 21 13:29:28 cloud kernel: [ 5091.781061] php5-fpm[16144]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]
Jul 21 13:29:28 cloud kernel: [ 5091.867168] php5-fpm[16146]: segfault at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in php5-fpm[400000+85c000]


And this:
⚡ cat /var/log/php5-fpm.log | grep -i warn | tail
[21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here] child 16267 exited on signal 11 (SIGSEGV) after 174.181309 seconds from start
[21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here] child 16261 exited on signal 11 (SIGSEGV) after 175.186522 seconds from start
[21-Jul-2016 13:30:20] WARNING: [pool owncloud.somedomain.here] child 16266 exited on signal 11 (SIGSEGV) after 175.229058 seconds from start
[21-Jul-2016 13:30:43] WARNING: [pool owncloud.somedomain.here] child 16303 exited on signal 11 (SIGSEGV) after 177.555848 seconds from start
[21-Jul-2016 13:31:04] WARNING: [pool owncloud.somedomain.here] child 16383 exited on signal 11 (SIGSEGV) after 175.119034 seconds from start
[21-Jul-2016 13:31:05] WARNING: [pool owncloud.somedomain.here] child 16377 exited on signal 11 (SIGSEGV) after 179.319993 seconds from start
[21-Jul-2016 13:31:09] WARNING: [pool owncloud.somedomain.here] child 16384 exited on signal 11 (SIGSEGV) after 173.453260 seconds from start
[21-Jul-2016 13:31:11] WARNING: [pool owncloud.somedomain.here] child 16385 exited on signal 11 (SIGSEGV) after 173.200730 seconds from start
[21-Jul-2016 13:31:15] WARNING: [pool owncloud.somedomain.here] child 16428 exited on signal 11 (SIGSEGV) after 168.492796 seconds from start
[21-Jul-2016 13:31:17] WARNING: [pool owncloud.somedomain.here] child 16426 exited on signal 11 (SIGSEGV) after 171.079030 seconds from start


And this:
[21-Jul-2016 13:28:56] WARNING: [pool owncloud.somedomain.here] child 16062 exited on signal 11 (SIGSEGV) after 173.474043 seconds from start
[21-Jul-2016 13:29:09] WARNING: [pool owncloud.somedomain.here] child 16102 exited on signal 11 (SIGSEGV) after 171.912835 seconds from start
[21-Jul-2016 13:29:15] WARNING: [pool owncloud.somedomain.here] child 16114 exited on signal 11 (SIGSEGV) after 173.574837 seconds from start
[21-Jul-2016 13:29:24] WARNING: [pool owncloud.somedomain.here] child 16145 exited on signal 11 (SIGSEGV) after 171.567673 seconds from start
[21-Jul-2016 13:29:28] WARNING: [pool owncloud.somedomain.here] child 16144 exited on signal 11 (SIGSEGV) after 175.886644 seconds from start
[21-Jul-2016 13:29:28] WARNING: [pool owncloud.somedomain.here] child 16146 exited on signal 11 (SIGSEGV) after 175.222437 seconds from start
[21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here] child 16267 exited on signal 11 (SIGSEGV) after 174.181309 seconds from start
[21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here] child 16261 exited on signal 11 (SIGSEGV) after 175.186522 seconds from start
[21-Jul-2016 13:30:20] WARNING: [pool owncloud.somedomain.here] child 16266 exited on signal 11 (SIGSEGV) after 175.229058 seconds from start
[21-Jul-2016 13:30:43] WARNING: [pool owncloud.somedomain.here] child 16303 exited on signal 11 (SIGSEGV) after 177.555848 seconds from start

Here is top output:
  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND                                                                                                                         
 3356 mysql     20   0 4589m 357m  15m S  93,6 14,9  54:31.44 mysqld                                                                                                                          
16884 owncloud  10 -10  375m  37m  25m S  24,9  1,6   0:00.75 php5-fpm                                                                                                                        
16732 owncloud  10 -10  390m  51m  24m S  16,9  2,2   0:10.47 php5-fpm                                                                                                                        
16618 owncloud  10 -10  400m  62m  25m S  16,3  2,6   0:17.30 php5-fpm                                                                                                                        
16742 owncloud  10 -10  391m  56m  30m S  15,9  2,4   0:09.20 php5-fpm                                                                                                                        
16616 owncloud  10 -10  402m  67m  30m R  15,6  2,8   0:17.17 php5-fpm                                                                                                                        
16543 owncloud  10 -10  410m  71m  24m S  15,3  3,0   0:25.70 php5-fpm                                                                                                                        
16617 owncloud  10 -10  399m  62m  25m S  14,6  2,6   0:17.61 php5-fpm                                                                                                                        
16672 owncloud  10 -10  395m  56m  24m S  14,3  2,3   0:13.62 php5-fpm                                                                                                                        
16733 owncloud  10 -10  390m  51m  24m S  14,3  2,2   0:10.24 php5-fpm                                                                                                                        
16879 owncloud  10 -10  377m  38m  24m S  14,3  1,6   0:01.59 php5-fpm                                                                                                                        
16790 owncloud  10 -10  383m  45m  25m S  13,9  1,9   0:06.02 php5-fpm                                                                                                                        
16791 owncloud  10 -10  384m  46m  25m S  13,9  1,9   0:06.10 php5-fpm                                                                                                                        
16830 owncloud  10 -10  382m  43m  24m S  13,9  1,8   0:04.67 php5-fpm                                                                                                                        
16789 owncloud  10 -10  386m  48m  25m S  13,6  2,0   0:07.85 php5-fpm                                                                                                                        
16880 owncloud  10 -10  375m  36m  24m S  13,3  1,5   0:01.02 php5-fpm                                                                                                                        
16740 owncloud  10 -10  389m  50m  24m S  12,9  2,1   0:09.45 php5-fpm                                                                                                                        
16741 owncloud  10 -10  388m  50m  24m S  12,9  2,1   0:09.08 php5-fpm                                                                                                                        
16831 owncloud  10 -10  381m  42m  24m R  12,9  1,8   0:04.30 php5-fpm                                                                                                                        
16836 owncloud  10 -10  379m  40m  24m S  12,9  1,7   0:02.81 php5-fpm                                                                                                                        
16739 owncloud  10 -10  390m  51m  24m S  12,3  2,2   0:10.11 php5-fpm


Where the problem might be, please? What shall I do?

Additional debug info:
PHP 5.5.36

mysql  Ver 15.1 Distrib 10.0.25-MariaDB

owncloud:
  - version: 8.2.5.2
  - versionstring: 8.2.5

Apache/2.4.10 (Debian)

OS:
  Description:    Debian GNU/Linux 7.11 (wheezy)
  Release:    7.11


Thanks a lot
McZ

--
 
Martin crysman Zahradník
www: crysmanovo.blogspot.com
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Re: php-fpm hanging: segfault, SIGSEGV - CPUs 100%

Frank de Lange
On Thu, 21 Jul 2016 13:39:40 +0200
Martin crysman Zahradník <[hidden email]> wrote:

> Hello,
>
> today owncloud webserver got too slow to even log-in. I did SSH and
> checked htop (top) - 100% CPU, load average around 23 (!)
>
> OK, that is bad.
>
> So I checked some log files and found this:
>
> ⚡ cat /var/log/messages | grep -i err | tail
> Jul 21 13:28:32 cloud kernel: [ 5035.723242] php5-fpm[16002]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
> Jul 21 13:28:45 cloud kernel: [ 5048.958776] php5-fpm[16032]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
> Jul 21 13:28:47 cloud kernel: [ 5050.946225] php5-fpm[16033]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
> Jul 21 13:28:51 cloud kernel: [ 5055.286449] php5-fpm[16034]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
> Jul 21 13:28:56 cloud kernel: [ 5059.719135] php5-fpm[16062]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
> Jul 21 13:29:09 cloud kernel: [ 5073.420829] php5-fpm[16102]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
> Jul 21 13:29:15 cloud kernel: [ 5079.317363] php5-fpm[16114]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
> Jul 21 13:29:24 cloud kernel: [ 5087.786983] php5-fpm[16145]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
> Jul 21 13:29:28 cloud kernel: [ 5091.781061] php5-fpm[16144]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
> Jul 21 13:29:28 cloud kernel: [ 5091.867168] php5-fpm[16146]: segfault
> at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
> php5-fpm[400000+85c000]
>
>
> And this:
> ⚡ cat /var/log/php5-fpm.log | grep -i warn | tail
> [21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here] child
> 16267 exited on signal 11 (SIGSEGV) after 174.181309 seconds from
> start [21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here]
> child 16261 exited on signal 11 (SIGSEGV) after 175.186522 seconds
> from start [21-Jul-2016 13:30:20] WARNING: [pool
> owncloud.somedomain.here] child 16266 exited on signal 11 (SIGSEGV)
> after 175.229058 seconds from start [21-Jul-2016 13:30:43] WARNING:
> [pool owncloud.somedomain.here] child 16303 exited on signal 11
> (SIGSEGV) after 177.555848 seconds from start [21-Jul-2016 13:31:04]
> WARNING: [pool owncloud.somedomain.here] child 16383 exited on signal
> 11 (SIGSEGV) after 175.119034 seconds from start [21-Jul-2016
> 13:31:05] WARNING: [pool owncloud.somedomain.here] child 16377 exited
> on signal 11 (SIGSEGV) after 179.319993 seconds from start
> [21-Jul-2016 13:31:09] WARNING: [pool owncloud.somedomain.here] child
> 16384 exited on signal 11 (SIGSEGV) after 173.453260 seconds from
> start [21-Jul-2016 13:31:11] WARNING: [pool owncloud.somedomain.here]
> child 16385 exited on signal 11 (SIGSEGV) after 173.200730 seconds
> from start [21-Jul-2016 13:31:15] WARNING: [pool
> owncloud.somedomain.here] child 16428 exited on signal 11 (SIGSEGV)
> after 168.492796 seconds from start [21-Jul-2016 13:31:17] WARNING:
> [pool owncloud.somedomain.here] child 16426 exited on signal 11
> (SIGSEGV) after 171.079030 seconds from start
>
>
> And this:
> [21-Jul-2016 13:28:56] WARNING: [pool owncloud.somedomain.here] child
> 16062 exited on signal 11 (SIGSEGV) after 173.474043 seconds from
> start [21-Jul-2016 13:29:09] WARNING: [pool owncloud.somedomain.here]
> child 16102 exited on signal 11 (SIGSEGV) after 171.912835 seconds
> from start [21-Jul-2016 13:29:15] WARNING: [pool
> owncloud.somedomain.here] child 16114 exited on signal 11 (SIGSEGV)
> after 173.574837 seconds from start [21-Jul-2016 13:29:24] WARNING:
> [pool owncloud.somedomain.here] child 16145 exited on signal 11
> (SIGSEGV) after 171.567673 seconds from start [21-Jul-2016 13:29:28]
> WARNING: [pool owncloud.somedomain.here] child 16144 exited on signal
> 11 (SIGSEGV) after 175.886644 seconds from start [21-Jul-2016
> 13:29:28] WARNING: [pool owncloud.somedomain.here] child 16146 exited
> on signal 11 (SIGSEGV) after 175.222437 seconds from start
> [21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here] child
> 16267 exited on signal 11 (SIGSEGV) after 174.181309 seconds from
> start [21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here]
> child 16261 exited on signal 11 (SIGSEGV) after 175.186522 seconds
> from start [21-Jul-2016 13:30:20] WARNING: [pool
> owncloud.somedomain.here] child 16266 exited on signal 11 (SIGSEGV)
> after 175.229058 seconds from start [21-Jul-2016 13:30:43] WARNING:
> [pool owncloud.somedomain.here] child 16303 exited on signal 11
> (SIGSEGV) after 177.555848 seconds from start
>
> Here is top output:
>   PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+
> COMMAND                                                                                                                        
>
>  3356 mysql     20   0 4589m 357m  15m S  93,6 14,9  54:31.44
> mysqld                                                                                                                          
>
> 16884 owncloud  10 -10  375m  37m  25m S  24,9  1,6   0:00.75
> php5-fpm                                                                                                                        
>
> 16732 owncloud  10 -10  390m  51m  24m S  16,9  2,2   0:10.47
> php5-fpm                                                                                                                        
>
> 16618 owncloud  10 -10  400m  62m  25m S  16,3  2,6   0:17.30
> php5-fpm                                                                                                                        
>
> 16742 owncloud  10 -10  391m  56m  30m S  15,9  2,4   0:09.20
> php5-fpm                                                                                                                        
>
> 16616 owncloud  10 -10  402m  67m  30m R  15,6  2,8   0:17.17
> php5-fpm                                                                                                                        
>
> 16543 owncloud  10 -10  410m  71m  24m S  15,3  3,0   0:25.70
> php5-fpm                                                                                                                        
>
> 16617 owncloud  10 -10  399m  62m  25m S  14,6  2,6   0:17.61
> php5-fpm                                                                                                                        
>
> 16672 owncloud  10 -10  395m  56m  24m S  14,3  2,3   0:13.62
> php5-fpm                                                                                                                        
>
> 16733 owncloud  10 -10  390m  51m  24m S  14,3  2,2   0:10.24
> php5-fpm                                                                                                                        
>
> 16879 owncloud  10 -10  377m  38m  24m S  14,3  1,6   0:01.59
> php5-fpm                                                                                                                        
>
> 16790 owncloud  10 -10  383m  45m  25m S  13,9  1,9   0:06.02
> php5-fpm                                                                                                                        
>
> 16791 owncloud  10 -10  384m  46m  25m S  13,9  1,9   0:06.10
> php5-fpm                                                                                                                        
>
> 16830 owncloud  10 -10  382m  43m  24m S  13,9  1,8   0:04.67
> php5-fpm                                                                                                                        
>
> 16789 owncloud  10 -10  386m  48m  25m S  13,6  2,0   0:07.85
> php5-fpm                                                                                                                        
>
> 16880 owncloud  10 -10  375m  36m  24m S  13,3  1,5   0:01.02
> php5-fpm                                                                                                                        
>
> 16740 owncloud  10 -10  389m  50m  24m S  12,9  2,1   0:09.45
> php5-fpm                                                                                                                        
>
> 16741 owncloud  10 -10  388m  50m  24m S  12,9  2,1   0:09.08
> php5-fpm                                                                                                                        
>
> 16831 owncloud  10 -10  381m  42m  24m R  12,9  1,8   0:04.30
> php5-fpm                                                                                                                        
>
> 16836 owncloud  10 -10  379m  40m  24m S  12,9  1,7   0:02.81
> php5-fpm                                                                                                                        
>
> 16739 owncloud  10 -10  390m  51m  24m S  12,3  2,2   0:10.11 php5-fpm
>
>
> Where the problem might be, please? *What shall I do?*
>
> Additional debug info:
> PHP 5.5.36
>
> mysql  Ver 15.1 Distrib 10.0.25-MariaDB
>
> owncloud:
>   - version: 8.2.5.2
>   - versionstring: 8.2.5
>
> Apache/2.4.10 (Debian)
>
> OS:
>   Description:    Debian GNU/Linux 7.11 (wheezy)
>   Release:    7.11
>
>
> Thanks a lot
> McZ
>

Whatever the problem is, it probably does not lie with Owncloud as a
script should in no circumstance cause an interpreter to segfault. The
problem most likely lies with either your specific PHP version or an
extension you have installed, you could try to get a backtrace or a
core dump to find out exactly where it segfaults.

Have you considered moving to PHP7? It is 'the future', after all. It
is maturing rapidly and works well on older hardware.

Gr//Fr
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Re: php-fpm hanging: segfault, SIGSEGV - CPUs 100%

Martin crysman Zahradník
It's working now.

We've made:
- some minor updates to PHP
- minor updates in system libraries and OS itself
- minor Owncloud update (to 8.2.7 from 8.2.5)

...just to let you know. Thanx #McZ

 
Martin crysman Zahradník
www: crysmanovo.blogspot.com
e-mail: [hidden email]
jabber: [hidden email]
Google talk/hangout: [hidden email]
facebook: no way!
Skype: no way! using Ekiga - [hidden email]
running GNU/Linux Xubuntu
Jak kupovat zodpovědně vejce (nejen) o Velikonocích?
On 21.7.2016 14:19, Frank de Lange wrote:
On Thu, 21 Jul 2016 13:39:40 +0200
Martin crysman Zahradník [hidden email] wrote:

Hello,

today owncloud webserver got too slow to even log-in. I did SSH and
checked htop (top) - 100% CPU, load average around 23 (!)

OK, that is bad.

So I checked some log files and found this:

⚡ cat /var/log/messages | grep -i err | tail
Jul 21 13:28:32 cloud kernel: [ 5035.723242] php5-fpm[16002]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]
Jul 21 13:28:45 cloud kernel: [ 5048.958776] php5-fpm[16032]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]
Jul 21 13:28:47 cloud kernel: [ 5050.946225] php5-fpm[16033]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]
Jul 21 13:28:51 cloud kernel: [ 5055.286449] php5-fpm[16034]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]
Jul 21 13:28:56 cloud kernel: [ 5059.719135] php5-fpm[16062]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]
Jul 21 13:29:09 cloud kernel: [ 5073.420829] php5-fpm[16102]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]
Jul 21 13:29:15 cloud kernel: [ 5079.317363] php5-fpm[16114]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]
Jul 21 13:29:24 cloud kernel: [ 5087.786983] php5-fpm[16145]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]
Jul 21 13:29:28 cloud kernel: [ 5091.781061] php5-fpm[16144]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]
Jul 21 13:29:28 cloud kernel: [ 5091.867168] php5-fpm[16146]: segfault
at 7fff795caed8 ip 0000000000690b2a sp 00007fff795cae90 error 6 in
php5-fpm[400000+85c000]


And this:
⚡ cat /var/log/php5-fpm.log | grep -i warn | tail
[21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here] child
16267 exited on signal 11 (SIGSEGV) after 174.181309 seconds from
start [21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here]
child 16261 exited on signal 11 (SIGSEGV) after 175.186522 seconds
from start [21-Jul-2016 13:30:20] WARNING: [pool
owncloud.somedomain.here] child 16266 exited on signal 11 (SIGSEGV)
after 175.229058 seconds from start [21-Jul-2016 13:30:43] WARNING:
[pool owncloud.somedomain.here] child 16303 exited on signal 11
(SIGSEGV) after 177.555848 seconds from start [21-Jul-2016 13:31:04]
WARNING: [pool owncloud.somedomain.here] child 16383 exited on signal
11 (SIGSEGV) after 175.119034 seconds from start [21-Jul-2016
13:31:05] WARNING: [pool owncloud.somedomain.here] child 16377 exited
on signal 11 (SIGSEGV) after 179.319993 seconds from start
[21-Jul-2016 13:31:09] WARNING: [pool owncloud.somedomain.here] child
16384 exited on signal 11 (SIGSEGV) after 173.453260 seconds from
start [21-Jul-2016 13:31:11] WARNING: [pool owncloud.somedomain.here]
child 16385 exited on signal 11 (SIGSEGV) after 173.200730 seconds
from start [21-Jul-2016 13:31:15] WARNING: [pool
owncloud.somedomain.here] child 16428 exited on signal 11 (SIGSEGV)
after 168.492796 seconds from start [21-Jul-2016 13:31:17] WARNING:
[pool owncloud.somedomain.here] child 16426 exited on signal 11
(SIGSEGV) after 171.079030 seconds from start


And this:
[21-Jul-2016 13:28:56] WARNING: [pool owncloud.somedomain.here] child
16062 exited on signal 11 (SIGSEGV) after 173.474043 seconds from
start [21-Jul-2016 13:29:09] WARNING: [pool owncloud.somedomain.here]
child 16102 exited on signal 11 (SIGSEGV) after 171.912835 seconds
from start [21-Jul-2016 13:29:15] WARNING: [pool
owncloud.somedomain.here] child 16114 exited on signal 11 (SIGSEGV)
after 173.574837 seconds from start [21-Jul-2016 13:29:24] WARNING:
[pool owncloud.somedomain.here] child 16145 exited on signal 11
(SIGSEGV) after 171.567673 seconds from start [21-Jul-2016 13:29:28]
WARNING: [pool owncloud.somedomain.here] child 16144 exited on signal
11 (SIGSEGV) after 175.886644 seconds from start [21-Jul-2016
13:29:28] WARNING: [pool owncloud.somedomain.here] child 16146 exited
on signal 11 (SIGSEGV) after 175.222437 seconds from start
[21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here] child
16267 exited on signal 11 (SIGSEGV) after 174.181309 seconds from
start [21-Jul-2016 13:30:19] WARNING: [pool owncloud.somedomain.here]
child 16261 exited on signal 11 (SIGSEGV) after 175.186522 seconds
from start [21-Jul-2016 13:30:20] WARNING: [pool
owncloud.somedomain.here] child 16266 exited on signal 11 (SIGSEGV)
after 175.229058 seconds from start [21-Jul-2016 13:30:43] WARNING:
[pool owncloud.somedomain.here] child 16303 exited on signal 11
(SIGSEGV) after 177.555848 seconds from start

Here is top output:
  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+ 
COMMAND                                                                                                                         

 3356 mysql     20   0 4589m 357m  15m S  93,6 14,9  54:31.44
mysqld                                                                                                                          

16884 owncloud  10 -10  375m  37m  25m S  24,9  1,6   0:00.75
php5-fpm                                                                                                                        

16732 owncloud  10 -10  390m  51m  24m S  16,9  2,2   0:10.47
php5-fpm                                                                                                                        

16618 owncloud  10 -10  400m  62m  25m S  16,3  2,6   0:17.30
php5-fpm                                                                                                                        

16742 owncloud  10 -10  391m  56m  30m S  15,9  2,4   0:09.20
php5-fpm                                                                                                                        

16616 owncloud  10 -10  402m  67m  30m R  15,6  2,8   0:17.17
php5-fpm                                                                                                                        

16543 owncloud  10 -10  410m  71m  24m S  15,3  3,0   0:25.70
php5-fpm                                                                                                                        

16617 owncloud  10 -10  399m  62m  25m S  14,6  2,6   0:17.61
php5-fpm                                                                                                                        

16672 owncloud  10 -10  395m  56m  24m S  14,3  2,3   0:13.62
php5-fpm                                                                                                                        

16733 owncloud  10 -10  390m  51m  24m S  14,3  2,2   0:10.24
php5-fpm                                                                                                                        

16879 owncloud  10 -10  377m  38m  24m S  14,3  1,6   0:01.59
php5-fpm                                                                                                                        

16790 owncloud  10 -10  383m  45m  25m S  13,9  1,9   0:06.02
php5-fpm                                                                                                                        

16791 owncloud  10 -10  384m  46m  25m S  13,9  1,9   0:06.10
php5-fpm                                                                                                                        

16830 owncloud  10 -10  382m  43m  24m S  13,9  1,8   0:04.67
php5-fpm                                                                                                                        

16789 owncloud  10 -10  386m  48m  25m S  13,6  2,0   0:07.85
php5-fpm                                                                                                                        

16880 owncloud  10 -10  375m  36m  24m S  13,3  1,5   0:01.02
php5-fpm                                                                                                                        

16740 owncloud  10 -10  389m  50m  24m S  12,9  2,1   0:09.45
php5-fpm                                                                                                                        

16741 owncloud  10 -10  388m  50m  24m S  12,9  2,1   0:09.08
php5-fpm                                                                                                                        

16831 owncloud  10 -10  381m  42m  24m R  12,9  1,8   0:04.30
php5-fpm                                                                                                                        

16836 owncloud  10 -10  379m  40m  24m S  12,9  1,7   0:02.81
php5-fpm                                                                                                                        

16739 owncloud  10 -10  390m  51m  24m S  12,3  2,2   0:10.11 php5-fpm


Where the problem might be, please? *What shall I do?*

Additional debug info:
PHP 5.5.36

mysql  Ver 15.1 Distrib 10.0.25-MariaDB

owncloud:
  - version: 8.2.5.2
  - versionstring: 8.2.5

Apache/2.4.10 (Debian)

OS:
  Description:    Debian GNU/Linux 7.11 (wheezy)
  Release:    7.11


Thanks a lot
McZ

Whatever the problem is, it probably does not lie with Owncloud as a
script should in no circumstance cause an interpreter to segfault. The
problem most likely lies with either your specific PHP version or an
extension you have installed, you could try to get a backtrace or a
core dump to find out exactly where it segfaults.

Have you considered moving to PHP7? It is 'the future', after all. It
is maturing rapidly and works well on older hardware.

Gr//Fr
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