Apache が突然死するので、ログを見てみると
$ tail /var/log/apache2/error.log
[Mon Sep 03 19:24:17.252747 2018] [mpm_prefork:emerg] [pid 7851] (43)Identifier removed: AH00144: couldn't grab the accept mutex
[Mon Sep 03 19:24:17.253264 2018] [mpm_prefork:emerg] [pid 7819] (43)Identifier removed: AH00144: couldn't grab the accept mutex
[Mon Sep 03 19:24:17.253385 2018] [mpm_prefork:emerg] [pid 7815] (43)Identifier removed: AH00144: couldn't grab the accept mutex
[Mon Sep 03 19:24:17.253561 2018] [mpm_prefork:emerg] [pid 7817] (43)Identifier removed: AH00144: couldn't grab the accept mutex
[Mon Sep 03 19:24:17.253739 2018] [mpm_prefork:emerg] [pid 7852] (43)Identifier removed: AH00144: couldn't grab the accept mutex
[Mon Sep 03 19:24:17.253916 2018] [mpm_prefork:emerg] [pid 7855] (43)Identifier removed: AH00144: couldn't grab the accept mutex
[Mon Sep 03 19:24:17.252992 2018] [mpm_prefork:emerg] [pid 7848] (43)Identifier removed: AH00144: couldn't grab the accept mutex
[Mon Sep 03 19:24:17.464946 2018] [core:alert] [pid 7636] AH00050: Child 7815 returned a Fatal error... Apache is exiting!
[Mon Sep 03 19:24:17.464976 2018] [:emerg] [pid 7636] AH02818: MPM run failed, exitin
となっていた。
Apache 2.4 で AH00144: couldn't grab the accept mutex | gwaw.jp
https://www.gwaw.jp/20180526-16.html
こちらを参考に
$ sudo bash -c "echo 'Mutex file:\${APACHE_LOCK_DIR} default' > /etc/apache2/conf-available/mutex-file.conf"
して
$ sudo a2enconf mutex-file
$ sudo systemctl restart apache2
した。
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