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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 52933] New: Child survives '-k stop', consuming lots of CPU
Date Sat, 17 Mar 2012 22:11:04 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=52933

             Bug #: 52933
           Summary: Child survives '-k stop', consuming lots of CPU
           Product: Apache httpd-2
           Version: 2.4.1
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: All
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: petterb@gmail.com
    Classification: Unclassified


MPM: Event
OS: Amazon Linux AMI release 2011.09 (CentOS)
APR: 1.4.6
APR-UTIL: 1.4.1

Our system is 1 sandbox server, 2 test and 3 prod. It has occured once (one
test server). 2.4.1 in use less than a week. Servers are clones. (Actually
based on the server in mind.)

Child finally killed with -5.

Post compiled and installed mod_geoip2_1.2.7 + 4 of my own modules.

$ sudo strace -ff -F -s200 -o /tmp/strace.out -p 27203
$ sort /tmp/strace.out.272*
epoll_wait(85, {}, 25, 100)             = 0
epoll_wait(85, {}, 25, 100)             = 0
epoll_wait(85, {}, 25, 100)             = 0
...more of same
futex(0x17a65bc, FUTEX_WAIT_PRIVATE, 41, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0x17a65bc, FUTEX_WAIT_PRIVATE, 43, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0x17a65bc, FUTEX_WAIT_PRIVATE, 45, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
...more of same
futex(0x17a65bc, FUTEX_WAIT_PRIVATE, 88, NULL
futex(0x17a65bc, FUTEX_WAIT_PRIVATE, 88, NULL
futex(0x17a65bc, FUTEX_WAIT_PRIVATE, 88, NULL
...more of same
futex(0x7fa11bfe79d0, FUTEX_WAIT, 27284, NULL
gettimeofday({1332018558, 639020}, NULL) = 0
gettimeofday({1332018560, 550880}, NULL) = 0
gettimeofday({1332018560, 550985}, NULL) = 0
...more of same


$ /usr/local/apache2/bin/apachectl -V
Server version: Apache/2.4.1 (Unix)
Server built:   Mar  9 2012 18:36:08
Server's Module Magic Number: 20120211:0
Server loaded:  APR 1.4.6, APR-UTIL 1.4.1
Compiled using: APR 1.4.6, APR-UTIL 1.4.1
Architecture:   64-bit
Server MPM:     event
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -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/apache2"
 -D SUEXEC_BIN="/usr/local/apache2/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"


$ cat config.nice 
#! /bin/sh
#
# Created by configure

"./configure" \
"--enable-sed" \
"--enable-usertrack" \
"--enable-unique-id" \
"--enable-proxy" \
"--enable-unixd" \
"--enable-rewrite" \
"--with-mpm=event" \
"--with-included-apr" \
"--enable-deflate" \
"--enable-ssl" \
"--enable-log-debug" \
"--enable-log-forensic" \
"--enable-logio" \
"$@"

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