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: [Sun Oct 21 09:18:23.023750 2018] [ssl:warn] [pid 6666:tid 140575585654528] (22)Invalid argument: AH02026: Failed to acquire SSL session cache lock [Sun Oct 21 09:18:23.023825 2018] [ssl:warn] [pid 6666:tid 140575585654528] (22)Invalid argument: AH02027: Failed to release SSL session cache lock [Sun Oct 21 09:27:35.580088 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling lock [Sun Oct 21 09:27:35.580157 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01949: Failed to release OCSP ssl-stapling lock [Sun Oct 21 09:27:35.580162 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling-refresh lock [Sun Oct 21 09:27:35.580168 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling lock [Sun Oct 21 09:27:35.580172 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01949: Failed to release OCSP ssl-stapling lock [Sun Oct 21 09:27:35.587511 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01948: Failed to acquire OCSP ssl-stapling lock [Sun Oct 21 09:27:35.587601 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01949: Failed to release OCSP ssl-stapling lock [Sun Oct 21 09:27:35.587612 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH01949: Failed to release OCSP ssl-stapling-refresh lock [Sun Oct 21 09:27:35.665843 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH02026: Failed to acquire SSL session cache lock [Sun Oct 21 09:27:35.665909 2018] [ssl:warn] [pid 6666:tid 140575453984512] (22)Invalid argument: AH02027: Failed to release SSL session cache lock I use Apache/2.4.29 (Ubuntu 18.04). I use http2 and ssl-stapling. Here is the info: Server version: Apache/2.4.29 (Ubuntu) Server built: 2018-10-03T14:41:08 Server's Module Magic Number: 20120211:68 Server loaded: APR 1.6.3, APR-UTIL 1.6.1 Compiled using: APR 1.6.3, APR-UTIL 1.6.1 Architecture: 64-bit Server MPM: event threaded: yes (fixed thread count) forked: yes (variable process count) Server compiled with.... -D APR_HAS_SENDFILE -D APR_HAS_MMAP -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled) -D APR_USE_SYSVSEM_SERIALIZE -D APR_USE_PTHREAD_SERIALIZE -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT -D APR_HAS_OTHER_CHILD -D AP_HAVE_RELIABLE_PIPED_LOGS -D DYNAMIC_MODULE_LIMIT=256 -D HTTPD_ROOT="/etc/apache2" -D SUEXEC_BIN="/usr/lib/apache2/suexec" -D DEFAULT_PIDLOG="/var/run/apache2.pid" -D DEFAULT_SCOREBOARD="logs/apache_runtime_status" -D DEFAULT_ERRORLOG="logs/error_log" -D AP_TYPES_CONFIG_FILE="mime.types" -D SERVER_CONFIG_FILE="apache2.conf" This is my dump config apache2ctl -t -D DUMP_RUN_CFG : ServerRoot: "/etc/apache2" Main DocumentRoot: "/var/www/html" Main ErrorLog: "/var/log/apache2/error.log" Mutex ssl-stapling: using_defaults Mutex proxy: using_defaults Mutex ssl-cache: using_defaults Mutex default: dir="/var/run/apache2/" mechanism=default Mutex watchdog-callback: using_defaults Mutex rewrite-map: using_defaults Mutex ssl-stapling-refresh: using_defaults PidFile: "/var/run/apache2/apache2.pid" Define: DUMP_RUN_CFG User: name="hernawan" id=1000 Group: name="hernawan" id=1000 please help to solve this issue, thanks
