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Posted to modperl@perl.apache.org by Sean Thorne <se...@gmail.com> on 2009/06/24 05:52:35 UTC
Apache Children Stuck on futex
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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/
Apache2/BuildConfig.pm
*** 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_GENERATE_XS => 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:
Platform:
osname=linux, osvers=2.6.9-67.0.7.elsmp, archname=i386-linux-
thread-multi
uname='linux hs20-bc1-5.build.redhat.com 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
usemultiplicity=define
useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
use64bitint=undef use64bitall=undef uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
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)',
gccosandvers=''
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',
lseeksize=8
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 -
lc
perllibs=-lresolv -lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
libc=/lib/libc-2.3.4.so, so=so, useshrplib=true, libperl=libperl.so
gnulibc_version='2.3.4'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -
Wl,-rpath,/usr/lib/perl5/5.8.5/i386-linux-thread-multi/CORE'
cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'
Characteristics of this binary (from libperl):
Compile-time options: DEBUGGING MULTIPLICITY USE_ITHREADS
USE_LARGE_FILES PERL_IMPLICIT_CONTEXT
Built under linux
Compiled at Jun 5 2008 07:33:47
%ENV:
PERL_LWP_USE_HTTP_10="1"
@INC:
/usr/lib/perl5/5.8.5/i386-linux-thread-multi
/usr/lib/perl5/5.8.5
/usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.3/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.1/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.5
/usr/lib/perl5/site_perl/5.8.4
/usr/lib/perl5/site_perl/5.8.3
/usr/lib/perl5/site_perl/5.8.2
/usr/lib/perl5/site_perl/5.8.1
/usr/lib/perl5/site_perl/5.8.0
/usr/lib/perl5/site_perl
/usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.4/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.3/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.2/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.1/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.5
/usr/lib/perl5/vendor_perl/5.8.4
/usr/lib/perl5/vendor_perl/5.8.3
/usr/lib/perl5/vendor_perl/5.8.2
/usr/lib/perl5/vendor_perl/5.8.1
/usr/lib/perl5/vendor_perl/5.8.0
/usr/lib/perl5/vendor_perl
.
*** 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.
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