1. Problem Description:
I'm attempting to upgrade one of the largest (measured both by users and
lines of code, I suspect) mod_perl sites from mod_perl 1 to mod_perl 2,
and also from 32 bit OS to 64 bit at the same time. I converted our
calls to use the new API, and basic functionality started working.
However, I am experiencing frequent segfaults in APR::Table (stack trace
below) when loading pages. Somewhere betwen 1 out of every 2-4 page
loads will cause it. Identical problem occurs on:
64 bit Debian Lenny with stock mod_perl 2.0.4
64 bit Debian Lenny with hand-built mod_perl 2.0.5-dev from latest source.
64 bit Centos 5.2 with stock mod_perl 2.0.2.
Let me know if there is any other information you need. I have not yet
tried it with mod_perl 2 on a 32-bit OS.
2. Used Components and their Configuration:
*** mod_perl version 2.000004
*** using /root/modperl-2.0/lib/Apache2/BuildConfig.pm
*** Makefile.PL options:
MP_APR_LIB => aprext
MP_APXS => /usr/bin/apxs
MP_COMPAT_1X => 1
MP_DEBUG => 1
MP_GENERATE_XS => 1
MP_LIBNAME => mod_perl
MP_TRACE => 1
MP_USE_DSO => 1
*** The httpd binary was not found
*** (apr|apu)-config linking info
-L/usr/lib -laprutil-1
-L/usr/lib -lapr-1 -luuid -lrt -lcrypt -lpthread -ldl
*** /usr/bin/perl -V
Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
Platform:
osname=linux, osvers=2.6.26-1-vserver-amd64,
archname=x86_64-linux-gnu-thread-multi
uname='linux excelsior 2.6.26-1-vserver-amd64 #1 smp sat nov 8
20:24:14 utc 2008 x86_64 gnulinux '
config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN
-Dcccdlflags=-fPIC -Darchname=x86_64-linux-gnu -Dprefix=/usr
-Dprivlib=/usr/share/perl/5.10 -Darchlib=/usr/lib/perl/5.10
-Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5
-Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local
-Dsitelib=/usr/local/share/perl/5.10.0
-Dsitearch=/usr/local/lib/perl/5.10.0 -Dman1dir=/usr/share/man/man1
-Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1
-Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl
-Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio
-Uusenm -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib
-Dlibperl=libperl.so.5.10.0 -Dd_dosuid -des'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=define, use64bitall=define, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN
-fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64',
optimize='-O2 -g',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing
-pipe -I/usr/local/include'
ccversion='', gccversion='4.3.2', gccosandvers=''
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64
libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt
perllibs=-ldl -lm -lpthread -lc -lcrypt
libc=/lib/libc-2.7.so, so=so, useshrplib=true, libperl=libperl.so.5.10.0
gnulibc_version='2.7'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -O2 -g -L/usr/local/lib'
Characteristics of this binary (from libperl):
Compile-time options: MULTIPLICITY PERL_DONT_CREATE_GVSV
PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP
USE_64_BIT_ALL
USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES
USE_PERLIO USE_REENTRANT_API
Built under linux
Compiled at Nov 27 2008 21:47:49
%ENV:
PERL_LWP_USE_HTTP_10="1"
@INC:
/etc/perl
/usr/local/lib/perl/5.10.0
/usr/local/share/perl/5.10.0
/usr/lib/perl5
/usr/share/perl5
/usr/lib/perl/5.10
/usr/share/perl/5.10
/usr/local/lib/site_perl
.
*** Packages of interest status:
Apache2 : -
Apache2::Request : 2.08
CGI : 3.29
ExtUtils::MakeMaker: 6.42, 6.48
LWP : 5.813
mod_perl : -
mod_perl2 : 2.000004
3. This is the core dump trace: (if you get a core dump):
#0 XS_APR__Table_FETCH (my_perl=0x1c04370, cv=<value optimized out>) at
/root/.cpan/build/mod_perl-2.0.4-rIfY74/xs/APR/Table/APR__Table.h:186
#1 0x00007feb01ffde80 in Perl_pp_entersub (my_perl=0x1c04370) at pp_hot.c:2850
#2 0x00007feb01ffc362 in Perl_runops_standard (my_perl=0x1c04370) at run.c:38
#3 0x00007feb01ff67d8 in Perl_call_sv (my_perl=0x1c04370, sv=0x94a2bd0,
flags=<value optimized out>) at perl.c:2638
#4 0x00007feb01fe638c in S_magic_methpack (my_perl=0x1c04370, sv=0x94a2ba0,
mg=0x415b5a0, meth=0x7feb02097079 "FETCH") at mg.c:1635
#5 0x00007feb01fe651b in Perl_magic_getpack (my_perl=0x200000002,
sv=0x94a2b88, mg=0x1) at mg.c:1650
#6 0x00007feb01fe9815 in Perl_mg_get (my_perl=0x1c04370, sv=0x94a2ba0) at
mg.c:207
#7 0x00007feb0200f95b in Perl_sv_setsv_flags (my_perl=0x1c04370, dstr=0x94a2bb8,
sstr=0x94a2ba0, flags=<value optimized out>) at sv.c:3507
#8 0x00007feb02010102 in Perl_sv_mortalcopy (my_perl=0x1c04370,
oldstr=0x94a2ba0) at sv.c:6914
#9 0x00007feb02001a08 in Perl_pp_helem (my_perl=0x1c04370) at pp_hot.c:1823
#10 0x00007feb01ffc362 in Perl_runops_standard (my_perl=0x1c04370) at run.c:38
#11 0x00007feb01ff6b18 in Perl_call_sv (my_perl=0x1c04370, sv=0x72ed808,
flags=4) at perl.c:2653
#12 0x00007feb022d8154 in modperl_callback () from
/usr/lib/apache2/modules/mod_perl.so
#13 0x00007feb022d8864 in modperl_callback_run_handlers () from
/usr/lib/apache2/modules/mod_perl.so
#14 0x00007feb022d8e5f in modperl_callback_per_dir () from
/usr/lib/apache2/modules/mod_perl.so
#15 0x00007feb022d2900 in ?? () from /usr/lib/apache2/modules/mod_perl.so
#16 0x00007feb022d2ab9 in modperl_response_handler_cgi () from
/usr/lib/apache2/modules/mod_perl.so
#17 0x0000000000438eb3 in ap_run_handler (r=0x934beb8) at
/build/buildd/apache2-2.2.9/server/config.c:159
#18 0x000000000043c47f in ap_invoke_handler (r=0x934beb8) at
/build/buildd/apache2-2.2.9/server/config.c:373
#19 0x000000000044962e in ap_process_request (r=0x934beb8) at
/build/buildd/apache2-2.2.9/modules/http/http_request.c:258
#20 0x0000000000446748 in ap_process_http_connection (c=0x933e038) at
/build/buildd/apache2-2.2.9/modules/http/http_core.c:190
#21 0x00000000004403d3 in ap_run_process_connection (c=0x933e038) at
/build/buildd/apache2-2.2.9/server/connection.c:43
#22 0x000000000044dc20 in child_main (child_num_arg=<value optimized out>) at
/build/buildd/apache2-2.2.9/server/mpm/prefork/prefork.c:672
#23 0x000000000044def8 in make_child (s=0x1b64968, slot=0) at
/build/buildd/apache2-2.2.9/server/mpm/prefork/prefork.c:713
#24 0x000000000044e510 in ap_mpm_run (_pconf=<value optimized out>, plog=<value
optimized out>, s=0x1b64968)
at /build/buildd/apache2-2.2.9/server/mpm/prefork/prefork.c:989
#25 0x0000000000425be5 in main (argc=2, argv=0x7fff116fa098) at
/build/buildd/apache2-2.2.9/server/main.c:732
Method it crashes in:
/* Try to shortcut apr_table_get by fetching the key using the current
* iterator (unless it's inactive or points at different key).
*/
static MP_INLINE const char *mpxs_APR__Table_FETCH(pTHX_ SV *tsv,
const char *key)
{
SV* rv = modperl_hash_tied_object_rv(aTHX_ "APR::Table", tsv);
const int i = mpxs_apr_table_iterix(rv);
apr_table_t *t = INT2PTR(apr_table_t *, SvIVX(SvRV(rv)));
const apr_array_header_t *arr = apr_table_elts(t);
apr_table_entry_t *elts = (apr_table_entry_t *)arr->elts; <---crashing line
186
if (i > 0 && i <= arr->nelts && !strcasecmp(key, elts[i-1].key)) {
return elts[i-1].val;
}
else {
return apr_table_get(t, key);
}
}
This report was generated by ./t/REPORT on Mon Dec 29 23:20:20 2008 GMT.
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