kern/53005: apache httpd can hang the system

[Shinichi Doyashiki <clare%csel.org@localhost>]

>Number:         53005
>Category:       kern
>Synopsis:       apache httpd can hang the system
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Feb 10 18:50:00 +0000 2018
>Originator:     Shinichi Doyashiki
>Release:        NetBSD 8.99.12
>Organization:
	at home
>Environment:
System: NetBSD kotori.csel.org 8.99.12 NetBSD 8.99.12 (CONOHAVPS) #3: Sun Jan 21 16:34:31 JST 2018 clare%mizuki.csel.org@localhost:/export/stage/hack/sys/arch/amd64/compile/CONOHAVPS amd64
Architecture: x86_64
Machine: amd64
>Description:
	recent environment behaves something strange.
	running "/usr/local/apache/bin/apachectl stop" is ok.
	running "/usr/local/apache/bin/apachectl start" is also ok.
	running "/usr/local/apache/bin/apachectl restart" is bad.
	the system hangs or behaves something storange after
	the operation.  system reboot is required to recover
	the system.

Server version: Apache/2.4.29 (Unix)
Server built:   Nov 19 2017 18:59:53
Server's Module Magic Number: 20120211:68
Server loaded:  APR 1.6.3, APR-UTIL 1.6.1
Compiled using: APR 1.6.3, APR-UTIL 1.6.1
Architecture:   64-bit
Server MPM:     event
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses disabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/usr/local/apache"
 -D SUEXEC_BIN="/usr/local/apache/bin/suexec"
 -D DEFAULT_PIDLOG="logs/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf"

#!/bin/sh
name=httpd
version=2.4.29
srcdir=$name-$version
objdir=$name-obj

rm -rf $objdir
mkdir -p $objdir
cd $objdir || exit

../$srcdir/configure \
	--prefix=/usr/local/apache \
	--with-nghttp2=/usr/pkg \
	--with-apr=/usr/pkg \
	--enable-so \
	--enable-http2

>How-To-Repeat:
	unknown yet.
>Fix:
	unknown yet.