Nothing found in /var/crash, enabled code dump but nothing happens: [Fri Apr 05 14:25:24.740627 2019] [core:error] [pid 2264] AH00546: no record of generation 0 of exiting child 27311 [Fri Apr 05 14:25:24.740630 2019] [core:notice] [pid 2264] AH00052: child pid 27312 exit signal Segmentation fault (11) [Fri Apr 05 14:25:24.740633 2019] [core:error] [pid 2264] AH00546: no record of generation 0 of exiting child 27312 [Fri Apr 05 14:25:24.740636 2019] [core:notice] [pid 2264] AH00052: child pid 27313 exit signal Segmentation fault (11) [Fri Apr 05 14:25:24.740679 2019] [core:error] [pid 2264] AH00546: no record of generation 0 of exiting child 27313 [Fri Apr 05 14:25:24.740683 2019] [core:notice] [pid 2264] AH00052: child pid 27314 exit signal Segmentation fault (11) [Fri Apr 05 14:25:24.740685 2019] [core:error] [pid 2264] AH00546: no record of generation 0 of exiting child 27314 [Fri Apr 05 14:25:24.740689 2019] [core:notice] [pid 2264] AH00052: child pid 27315 exit signal Segmentation fault (11) [Fri Apr 05 14:25:24.740691 2019] [core:error] [pid 2264] AH00546: no record of generation 0 of exiting child 27315 [Fri Apr 05 14:25:24.740695 2019] [core:notice] [pid 2264] AH00052: child pid 27316 exit signal Segmentation fault (11) [Fri Apr 05 14:25:24.740699 2019] [core:error] [pid 2264] AH00546: no record of generation 0 of exiting child 27316 No core dump has been created. Apache hangs usually during lunch break when the pc is idle. This is the syslog produced in this time: Apr 5 12:50:26 pc-claudio automount[2635]: message repeated 2 times: [ key ".hidden" not found in map source(s).] Apr 5 12:56:13 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com). Apr 5 12:56:23 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com). Apr 5 12:56:33 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com). Apr 5 12:56:43 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com). Apr 5 13:00:02 pc-claudio CRON[17540]: (caiofior) CMD (rsync -r /home/caiofior/Dropbox/ABBREVIA_DOC/ /media/Documenti/Documenti/sviluppo/Documenti) Apr 5 13:00:02 pc-claudio cron[1278]: sendmail: fatal: open /etc/postfix/main.cf: No such file or directory Apr 5 13:00:02 pc-claudio postfix/sendmail[17553]: fatal: open /etc/postfix/main.cf: No such file or directory Apr 5 13:00:03 pc-claudio CRON[17539]: (caiofior) MAIL (mailed 208 bytes of output but got status 0x004b from MTA#012) Apr 5 13:01:45 pc-claudio systemd[1]: Started Run anacron jobs. Apr 5 13:01:45 pc-claudio anacron[18211]: Anacron 2.3 started on 2019-04-05 Apr 5 13:01:45 pc-claudio anacron[18211]: Normal exit (0 jobs run) Apr 5 13:09:02 pc-claudio systemd[1]: Starting Clean php session files... Apr 5 13:09:02 pc-claudio CRON[21032]: (root) CMD ( [ -x /usr/lib/php/sessionclean ] && if [ ! -d /run/systemd/system ]; then /usr/lib/php/sessionclean; fi) Apr 5 13:09:11 pc-claudio systemd[1]: Started Clean php session files. Apr 5 13:17:02 pc-claudio CRON[24148]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Apr 5 13:31:02 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com). Apr 5 13:31:12 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com). Apr 5 13:31:22 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com). Apr 5 13:31:33 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com). Apr 5 13:39:02 pc-claudio CRON[12269]: (root) CMD ( [ -x /usr/lib/php/sessionclean ] && if [ ! -d /run/systemd/system ]; then /usr/lib/php/sessionclean; fi) Apr 5 13:39:02 pc-claudio systemd[1]: Starting Clean php session files... Apr 5 13:39:03 pc-claudio systemd[1]: Started Clean php session files. Apr 5 13:48:18 pc-claudio smartd[1254]: Device: /dev/sda [SAT], SMART Usage Attribute: 190 Airflow_Temperature_Cel changed from 64 to 66 Apr 5 13:48:18 pc-claudio smartd[1254]: Device: /dev/sda [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 36 to 34 Apr 5 13:48:18 pc-claudio smartd[1254]: Device: /dev/sdb [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 111 to 115 Apr 5 13:55:20 pc-claudio automount[2635]: key ".hidden" not found in map source(s). Apr 5 13:55:22 pc-claudio kernel: [18474.326518] FS-Cache: Duplicate cookie detected Apr 5 13:55:22 pc-claudio kernel: [18474.326523] FS-Cache: O-cookie c=000000008bad47e3 [p=000000005b3550df fl=222 nc=3 na=1] Apr 5 13:55:22 pc-claudio kernel: [18474.326525] FS-Cache: O-cookie d=00000000dbc45e75 n=00000000ec6ea3fe Apr 5 13:55:22 pc-claudio kernel: [18474.326526] FS-Cache: O-key=[8] '020001bd0a00000b' Apr 5 13:55:22 pc-claudio kernel: [18474.326531] FS-Cache: N-cookie c=000000004d641dc9 [p=000000005b3550df fl=2 nc=0 na=1] Apr 5 13:55:22 pc-claudio kernel: [18474.326532] FS-Cache: N-cookie d=00000000dbc45e75 n=000000006c2a9486 Apr 5 13:55:22 pc-claudio kernel: [18474.326533] FS-Cache: N-key=[8] '020001bd0a00000b' Apr 5 13:55:22 pc-claudio automount[2635]: message repeated 2 times: [ key ".hidden" not found in map source(s).] Apr 5 14:00:02 pc-claudio CRON[15268]: (caiofior) CMD (rsync -r /home/caiofior/Dropbox/ABBREVIA_DOC/ /media/Documenti/Documenti/sviluppo/Documenti) Apr 5 14:00:02 pc-claudio cron[1278]: sendmail: fatal: open /etc/postfix/main.cf: No such file or directory Apr 5 14:00:02 pc-claudio postfix/sendmail[15286]: fatal: open /etc/postfix/main.cf: No such file or directory Apr 5 14:00:03 pc-claudio CRON[15265]: (caiofior) MAIL (mailed 208 bytes of output but got status 0x004b from MTA#012) Apr 5 14:02:52 pc-claudio systemd[1]: Started Run anacron jobs. Apr 5 14:02:53 pc-claudio anacron[26597]: Anacron 2.3 started on 2019-04-05 Apr 5 14:02:53 pc-claudio anacron[26597]: Normal exit (0 jobs run) Apr 5 14:05:51 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com). Apr 5 14:06:01 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com). Apr 5 14:06:12 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com). Apr 5 14:06:22 pc-claudio systemd-timesyncd[1092]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com). Apr 5 14:08:13 pc-claudio kernel: [19246.233758] TCP: eno1: Driver has suspect GRO implementation, TCP performance may be compromised. Apr 5 14:08:39 pc-claudio dbus-daemon[4131]: [session uid=1000 pid=4131] Activating via systemd: service name='org.gnome.evince.Daemon' unit='org.gnome.Evince.service' requested by ':1.285' (uid=1000 pid=16176 comm="evince /tmp/mozilla_caiofior0/doc07886820190405134" label="/usr/bin/evince (enforce)") Apr 5 14:08:40 pc-claudio systemd[4006]: Starting Evince document viewer... Apr 5 14:08:41 pc-claudio dbus-daemon[4131]: [session uid=1000 pid=4131] Successfully activated service 'org.gnome.evince.Daemon' Apr 5 14:08:41 pc-claudio systemd[4006]: Started Evince document viewer. Apr 5 14:09:01 pc-claudio CRON[17300]: (root) CMD ( [ -x /usr/lib/php/sessionclean ] && if [ ! -d /run/systemd/system ]; then /usr/lib/php/sessionclean; fi) Apr 5 14:09:01 pc-claudio systemd[1]: Starting Clean php session files... Apr 5 14:09:05 pc-claudio systemd[1]: Started Clean php session files. Apr 5 14:17:01 pc-claudio CRON[14059]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Apr 5 14:18:18 pc-claudio smartd[1254]: Device: /dev/sda [SAT], SMART Usage Attribute: 190 Airflow_Temperature_Cel changed from 66 to 65 Apr 5 14:18:18 pc-claudio smartd[1254]: Device: /dev/sda [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 34 to 35 Apr 5 14:18:18 pc-claudio smartd[1254]: Device: /dev/sdb [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 115 to 112