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From Sean Thorne <>
Subject Apache Children Stuck on futex
Date Wed, 24 Jun 2009 03:52:35 GMT
-------------8<---------- Start Bug Report ------------8<----------
1. Problem Description:

  I've got some Apache Children that are getting stuck on a futex  
call.  This started happening on a Apache 2.2.6 worker w/ mod_per  
2.0.4 install, so I upgraded to Apache 2.2.11 worker w/ mod_perl 2.0.4  
and it still continues.  I have modules for proxy and php installed as  
well, but this problem only presents when using mod_perl and  
MaxRequestsPerChild.  If I remove mod_perl the Apache children close  
as expected.  It's easily replicated using an abusive ab test and  
turning down MaxRequestsPerChild.  I know I could turn off  
MaxRequestsPerChild, but I have that on to deal with PHP's poor thread  
handling and memory leaks.  I could switch to prefork, but the servers  
I have don't have enough RAM to handle the load I need them too.  Any  
help would be appreciated.

  This child appears to be waiting for PID 3451, but that PID no  
longer exists.

  [sthorne@81082-spare ~]$ sudo strace -p 3271
  Process 3271 attached - interrupt to quit
  futex(0x1b5bbe8, FUTEX_WAIT, 3451, NULL

2. Used Components and their Configuration:

*** mod_perl version 2.000004

*** using /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/ 

*** Makefile.PL options:
  MP_APR_CONFIG  => /my_setup/apps/apache/bin/apr-1-config
  MP_APR_LIB     => aprext
  MP_APXS        => /my_setup/apps/apache/bin/apxs
  MP_COMPAT_1X   => 1
  MP_LIBNAME     => mod_perl
  MP_USE_DSO     => 1

*** The httpd binary was not found

*** (apr|apu)-config linking info

(apr|apu)-config scripts were not found

*** /usr/bin/perl -V
Summary of my perl5 (revision 5 version 8 subversion 5) configuration:
    osname=linux, osvers=2.6.9-67.0.7.elsmp, archname=i386-linux- 
    uname='linux 2.6.9-67.0.7.elsmp #1 smp  
wed feb 27 04:47:23 est 2008 i686 i686 i386 gnulinux '
    config_args='-des -Doptimize=-O2 -g -pipe -m32 -march=i386 - 
mtune=pentium4 -Dversion=5.8.5 -Dmyhostname=localhost - 
Dperladmin=root@localhost -Dcc=gcc -Dcf_by=Red Hat, Inc. - 
Dinstallprefix=/usr -Dprefix=/usr -Darchname=i386-linux - 
Dvendorprefix=/usr -Dsiteprefix=/usr -Duseshrplib -Dusethreads - 
Duseithreads -Duselargefiles -Dd_dosuid -Dd_semctl_semun -Di_db - 
Ui_ndbm -Di_gdbm -Di_shadow -Di_syslog -Dman3ext=3pm -Duseperlio - 
Dinstallusrbinperl -Ubincompat5005 -Uversiononly -Dpager=/usr/bin/less  
-isr -Dinc_version_list=5.8.4 5.8.3 5.8.2 5.8.1 5.8.0'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef useithreads=define  
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
    cc='gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING -fno- 
strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE - 
D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm',
    optimize='-O2 -g -pipe -m32 -march=i386 -mtune=pentium4',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING -fno-strict- 
aliasing -pipe -I/usr/local/include -I/usr/include/gdbm'
    ccversion='', gccversion='3.4.6 20060404 (Red Hat 3.4.6-9)',  
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',  
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lresolv -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread - 
    perllibs=-lresolv -lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=/lib/, so=so, useshrplib=true,
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E - 
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'

Characteristics of this binary (from libperl):
  Built under linux
  Compiled at Jun  5 2008 07:33:47

*** Packages of interest status:

Apache2            : -
Apache2::Request   : -
CGI                : 3.05
ExtUtils::MakeMaker: 6.17
LWP                : 5.808
mod_perl           : -
mod_perl2          : 2.000004

3. This is the core dump trace: (if you get a core dump):

  Nothing has cored

This report was generated by /usr/bin/mp2bug on Wed Jun 24 03:36:25  
2009 GMT.

-------------8<---------- End Bug Report --------------8<----------

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