When logrotate did its work this week-end, it ran /etc/init.d/apache2 reload. In the log files: [Sun Aug 18 06:25:51.267032 2013] [mpm_event:notice] [pid 7618:tid 140663945377600] AH00493: SIGUSR1 received. Doing graceful restart [Sun Aug 18 06:25:51.501217 2013] [ssl:warn] [pid 7618:tid 140663945377600] AH02292: Init: Name-based SSL virtual hosts only work for clients with TLS server name indication support (RFC 4366) [Sun Aug 18 06:25:51.501469 2013] [mpm_event:notice] [pid 7618:tid 140663945377600] AH00489: Apache/2.4.6 (Debian) SVN/1.7.9 OpenSSL/1.0.1e mod_wsgi/3.4 Python/2.7.3 configured -- resuming normal operations [Sun Aug 18 06:25:51.501500 2013] [core:notice] [pid 7618:tid 140663945377600] AH00094: Command line: '/usr/sbin/apache at this time, a core file was generated with this backtrace: (gdb) core core-apache2.9927 [New LWP 9927] warning: Can't read pathname for load map: Input/output error. warning: "/usr/lib/debug/.build-id/d1/7ee702718ddcd69e0be5db24b49a2bd4ab720e.debug": separate debug info file has no debug info [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". warning: "/usr/lib/debug/.build-id/2d/7fb1beefaa5a7ca4e13df623b1c8ea41ac16ff.debug": separate debug info file has no debug info warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7ffff9312000 Core was generated by `/usr/sbin/apache2 -k start'. Program terminated with signal 11, Segmentation fault. #0 0x00007feed931b970 in set_max_workers (cmd=0x3, dummy=<optimized out>, arg=0x7feee06b1358 "") at event.c:3194 3194 event.c: No such file or directory. (gdb) thread apply all bt Thread 1 (Thread 0x7feee07f3740 (LWP 9927)): #0 0x00007feed931b970 in set_max_workers (cmd=0x3, dummy=<optimized out>, arg=0x7feee06b1358 "") at event.c:3194 #1 0x0000000000000000 in ?? () I'm running Apache httpd 2.4.6 on Debian GNU/Linux Wheezy AMD64.