Failed to acquire SSL session cache lock (Apache Users)

Failed to acquire SSL session cache lock

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To: "users@xxxxxxxxxxxxxxxx" <users@xxxxxxxxxxxxxxxx>

Subject: Failed to acquire SSL session cache lock

From: Muhammad Hernawan <mwanmedia@xxxxxxxxxxxxxxxxxxxxx>

Date: Sun, 21 Oct 2018 07:25:28 +0000 (UTC)

Reply-to: users@xxxxxxxxxxxxxxxx

Reply-to: Muhammad Hernawan <mwanmedia@xxxxxxxxx>

This problem occurs after 1-3 days of apache start. After restarting apache, the error / warning does not occur again, but after some time or several days, the error occurs again. Until now I did not know what the cause of the error are.

Here is the error log, I got ssl:warn on my error log:

Invalid argument: AH02026: Failed to acquire SSL session cache lock
Invalid argument: AH02027: Failed to release SSL session cache lock
Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling lock
Invalid argument: AH01949: Failed to release OCSP ssl-stapling lock
Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling-refresh lock
Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling lock
Invalid argument: AH01949: Failed to release OCSP ssl-stapling lock

I use Apache/2.4.29 (Ubuntu 18.04). I use http2 and ssl-stapling.