Description of issue
My Apache starts processess and each of them takes 100%. Eventually mysql might crach or apache process is terminated with below error message.
CPU load behaves this way
Apache starts to cumulate
Swapping starts and then its downhill
Load increase / process hang is random, but currently very frequent. It lasts around 30secs and then might resolve by itself or not. When multiple processes have similar hang-situation server gets overloaded, swapping starts and sql craches.
[Tue Nov 30 05:35:16.653263 2021] [ssl:info] [pid 1483] (70007)The timeout specified has expired: [client 114.119.129.191:48226] AH01993: SSL output filter write failed.
I have analyzed the issue with strace etc. but have found no solution.
Tested solutions
VirtualHost with full address & IP:
I have added the IP in the VirtualHost as specified: "SSL input filter read failed" Apache and 443
One interesting lead: https://forums.cpanel.net/threads/ssl-input-filter-read-failed-solutions.680869/
Apache has a race-condition when it kills and restarts its
piped-logging processes on graceful restart before all of its children
handling ongoing client connections have finished, resulting in a
"Broken pipe" error when those children attempt to log to a pipe that
no longer exists.
Because it is a race-condition, this will be more likely to happen on
busier servers where httpd children are servicing a client request in
the middle of a graceful restart, and unlikely to be seen on idle
servers.
Servername with full address:
I added full ServerName according to this.
https://bz.apache.org/bugzilla/show_bug.cgi?id=52794
And that did not help.
Server setup: Ubuntu 20, Apache, Mysql, Django. All on latest versions
Any suggestions how to debug this further?
