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From Paul Burton <paulburt...@gmail.com>
Subject Segmentation fault when starting Apache 2.2.26 with Perl 5.18.1 and mod_perl 2.0.8
Date Fri, 21 Mar 2014 14:47:21 GMT
I'm using Slackware 14.1, but since it includes Apache 2.4 (which based
on what I've read is no compatible with mod_perl), I removed it and
installed the latest Apache 2.2 from source. Once that was done, I
confirmed that the basic installation was working (Got the "It works!"
page when I loaded localhost:80).

I downloaded mod_perl 2.0.8 and made sure all its dependencies were
installed (the official docs said to just install Bundle::Apache2 from
CPAN).

The module installed correctly once I provided the path to apxs in the
Apache bin directory.

I made sure that mod_perl.so was installed in the modules directory and
added "LoadModule perl_module modules/mod_perl.so" to httpd.conf.

But here's what happens when I try to start the server (and I did make
sure there were no other httpd processes running):

root@nas:~# /usr/local/apache2/bin/apachectl start
/usr/local/apache2/bin/apachectl: line 78: 28245 Segmentation fault
 $HTTPD -k $ARGV




dmesg contains this message:

httpd[28245]: segfault at c ip b702020b sp bf84a000 error 4 in
mod_perl.so[b7001000+37000]





Here are the details of my configuration:

root@nas:~# perl -V
Summary of my perl5 (revision 5 version 18 subversion 1) configuration:

  Platform:
    osname=linux, osvers=3.10.9-smp, archname=i486-linux-thread-multi
    uname='linux hive 3.10.9-smp #1 smp wed aug 21 15:27:17 cdt 2013
i686 amd phenom(tm) ii x6 1100t processor authenticamd gnulinux '
    config_args='-de -Dprefix=/usr -Dsiteprefix=/usr/local
-Dsitelib=/usr/local/share/perl5 -Dsitearch=/usr/local/lib/perl5
-Darchlib=/usr/lib/perl5 -Dvendorprefix=/usr -Dprivlib=/usr/share/perl5
-Dvendorlib=/usr/share/perl5/vendor_perl
-Dvendorarch=/usr/lib/perl5/vendor_perl -Dscriptdir=/usr/bin
-Dcccdlflags=-fPIC -Dinstallprefix=/usr -Dlibpth=/usr/local/lib /usr/lib
/lib -Doptimize=-O2 -march=i486 -mtune=i686 -Dusethreads -Duseithreads
-Duseshrplib -Ubincompat5005 -Uversiononly -Dpager=/usr/bin/less -isr
-Darchname=i486-linux'
    hint=recommended, useposix=true, d_sigaction=define
    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='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing
-pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64',
    optimize='-O2 -march=i486 -mtune=i686',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe
-fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.8.1', 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='cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib /lib
    libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=/lib/libc-2.17.so, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version='2.17'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E
-Wl,-rpath,/usr/lib/perl5/CORE'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -march=i486 -mtune=i686
-L/usr/local/lib -fstack-protector'


Characteristics of this binary (from libperl):
  Compile-time options: HAS_TIMES MULTIPLICITY PERLIO_LAYERS
                        PERL_DONT_CREATE_GVSV
                        PERL_HASH_FUNC_ONE_AT_A_TIME_HARD
                        PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP
                        PERL_PRESERVE_IVUV PERL_SAWAMPERSAND USE_ITHREADS
                        USE_LARGE_FILES USE_LOCALE USE_LOCALE_COLLATE
                        USE_LOCALE_CTYPE USE_LOCALE_NUMERIC USE_PERLIO
                        USE_PERL_ATOF USE_REENTRANT_API
  Built under linux
  Compiled at Sep  5 2013 22:01:10
  @INC:
    /usr/local/lib/perl5
    /usr/local/share/perl5
    /usr/lib/perl5/vendor_perl
    /usr/share/perl5/vendor_perl
    /usr/lib/perl5
    /usr/share/perl5
    .




root@nas:~# /usr/local/apache2/bin/httpd -V
Server version: Apache/2.2.26 (Unix)
Server built:   Mar 21 2014 08:03:13
Server's Module Magic Number: 20051115:33
Server loaded:  APR 1.4.6, APR-Util 1.5.1
Compiled using: APR 1.4.6, APR-Util 1.5.1
Architecture:   32-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -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=128
 -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_LOCKFILE="logs/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf"




root@nas:~# /usr/local/apache2/bin/httpd -M
Loaded Modules:
 core_module (static)
 authn_file_module (static)
 authn_default_module (static)
 authz_host_module (static)
 authz_groupfile_module (static)
 authz_user_module (static)
 authz_default_module (static)
 auth_basic_module (static)
 include_module (static)
 filter_module (static)
 log_config_module (static)
 env_module (static)
 setenvif_module (static)
 version_module (static)
 mpm_prefork_module (static)
 http_module (static)
 mime_module (static)
 status_module (static)
 autoindex_module (static)
 asis_module (static)
 cgi_module (static)
 negotiation_module (static)
 dir_module (static)
 actions_module (static)
 userdir_module (static)
 alias_module (static)
 so_module (static)
 perl_module (shared)
Syntax OK




root@nas:~# grep -v '^ *#' /usr/local/apache2/conf/httpd.conf
ServerRoot "/usr/local/apache2"

Listen 80

LoadModule perl_module modules/mod_perl.so

<IfModule !mpm_netware_module>
<IfModule !mpm_winnt_module>
User daemon
Group daemon

</IfModule>
</IfModule>

ServerAdmin you@example.com

DocumentRoot "/usr/local/apache2/htdocs"

<Directory />
    Options FollowSymLinks
    AllowOverride None
    Order deny,allow
    Deny from all
</Directory>

<Directory "/usr/local/apache2/htdocs">
    Options Indexes FollowSymLinks
    AllowOverride None
    Order allow,deny
    Allow from all
</Directory>

<IfModule dir_module>
    DirectoryIndex index.html
</IfModule>

<FilesMatch "^\.ht">
    Order allow,deny
    Deny from all
    Satisfy All
</FilesMatch>

ErrorLog "logs/error_log"

LogLevel warn

<IfModule log_config_module>
    LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\"
\"%{User-Agent}i\"" combined
    LogFormat "%h %l %u %t \"%r\" %>s %b" common

    <IfModule logio_module>
      LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\"
\"%{User-Agent}i\" %I %O" combinedio
    </IfModule>

    CustomLog "logs/access_log" common

</IfModule>

<IfModule alias_module>
    ScriptAlias /cgi-bin/ "/usr/local/apache2/cgi-bin/"
</IfModule>

<IfModule cgid_module>
</IfModule>

<Directory "/usr/local/apache2/cgi-bin">
    AllowOverride None
    Options None
    Order allow,deny
    Allow from all
</Directory>

DefaultType text/plain

<IfModule mime_module>
    TypesConfig conf/mime.types
    AddType application/x-compress .Z
    AddType application/x-gzip .gz .tgz
</IfModule>

<IfModule ssl_module>
SSLRandomSeed startup builtin
SSLRandomSeed connect builtin
</IfModule>


-- 
Paul Burton paulburton0@gmail.com

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