Apache 2.4.6 (Cent OS 7 package httpd-2.4.6-80.el7.centos.1.x86_64) is crashing during graceful restart. In error_log: [core:notice] [pid 31670] AH00060: seg fault or similar nasty error detected in the parent process # gdb /sbin/httpd /var/log/httpd/core/core-httpd-11-0-0-19797-1537171675 GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-110.el7 Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/sbin/httpd...Reading symbols from /usr/lib/debug/usr/sbin/httpd.debug...done. done. [New LWP 19797] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". Core was generated by `/usr/sbin/httpd -DFOREGROUND'. Program terminated with signal 11, Segmentation fault. #0 __GI___libc_free (mem=0x970ea725) at malloc.c:2935 2935 if (chunk_is_mmapped(p)) /* release mmapped memory. */ strace -p 23725: ... stat("/etc/krb5.conf", {st_mode=S_IFREG|0644, st_size=590, ...}) = 0 open("/etc/krb5.conf", O_RDONLY) = 66 fcntl(66, F_SETFD, FD_CLOEXEC) = 0 fstat(66, {st_mode=S_IFREG|0644, st_size=590, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f01ae275000 read(66, "# Configuration snippets may be "..., 4096) = 590 openat(AT_FDCWD, "/etc/krb5.conf.d/", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 67 getdents(67, /* 2 entries */, 32768) = 48 getdents(67, /* 0 entries */, 32768) = 0 close(67) = 0 read(66, "", 4096) = 0 close(66) = 0 munmap(0x7f01ae275000, 4096) = 0 --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x970ea71d} --- chdir("/var/log/httpd/core") = 0 rt_sigaction(SIGSEGV, {SIG_DFL, [], SA_RESTORER|SA_INTERRUPT, 0x7f01acd496d0}, {SIG_DFL, [], SA_RESTORER|SA_RESETHAND, 0x7f01acd496d0}, 8) = 0 write(2, "[Mon Sep 17 11:46:40.807530 2018"..., 133) = 133 kill(23725, SIGSEGV) = 0 rt_sigreturn({mask=[]}) = 0 --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_USER, si_pid=23725, si_uid=0} --- +++ killed by SIGSEGV (core dumped) +++
You'll need to report this to redhat or reproduce on a recent source release to move forward.