With a default apparmor configuration and apparmor running (as a boot service) apache2 restart failes with Permission denied: AH00057: sending signal to server. Setting /usr/sbin/apache2 to complain (aa-complain) or trying aa-logprof the following rule is suggested: signal send set=term peer=unconfined, The current rule regarding signals is signal (send) peer=@{profile_name}//*, Which would also be converted to send without braces (through aa-logprof). After auto-adjustment through aa-logprof, changing both rules, /etc/init.d/apache2 restart works as expected. Apache package version is 2.4.46 and AppArmor 2.13.4. Kernel version is 5.4.60. Reproducible: Always Steps to Reproduce: 1. enable apparmor, default profiles/ no changes 2. restart apache 3. error message displayed 4. stop apparmor 5. repeat /etc/init.d/apache restart 6. suddenly works 7. re-enable apparmar 8. stops working again, same error Actual Results: /etc/init.d/apache2 restart bails out with Permission denied: AH00057: sending signal to server Expected Results: simply restarts apache
Can start/ stop/ restart Apache.
