retitle 902657 graceful/restart results in segfault if libcap-ng0 is loaded severity 902657 important block 902657 by 904808 thanks The problem is caused by libcap-ng0 0.7.9 . This is usually pulled in by php extensions. There is nothing apache can do. Unfortunately, downgrading to 0.7.7 from stretch is not possible due to dependencies.