I have just configured a new server that keeps dying from time to time. The error log indicated the following problem:
[Thu Feb 11 03:21:15.261690 2016] [mpm_prefork:emerg] [pid 1273] (43)Identifier removed: AH00144: couldn't grab the accept mutex [Thu Feb 11 03:21:15.640431 2016] [core:alert] [pid 1256] AH00050: Child 1258 returned a Fatal error... Apache is exiting!
I tried the solution listed here (basically to add
AcceptMutex flock to httpd.conf) , but Apache wouldn't start:
Invalid command 'AcceptMutex', perhaps misspelled or defined by a module not included in the server
So now I don't know what else to do.