[mp2] segfault when generating graphs with GD::Graph under Embperl
Hi! 1. Problem Description: My apache child crash with a segfault when I call a page which generates a graph using the perl module GD::Graph. My system specs are: Fedora Core 1 httpd-2.0.47 (from fedora, also tried with self-compiled 2.0.48) mod_perl-1.99_11 (the final version, self-compiled) embperl-2.0b10 (current cvs snapshot, self-compiled) perl-5.8.1 (from fedora, also tried with self-compiled 5.8.2) gd-2.0.15 (from fedora, also tried with self-compiled 2.0.15) freetype-2.1.4 (from fedora, also tried with self-compiled 2.1.5) All perl modules are the newest version from CPAN. The reported versions are my current state: httpd from fedora, everything else self-compiled. 2. Used Components and their Configuration: *** mod_perl version 1.9911 *** using lib/Apache/BuildConfig.pm *** Makefile.PL options: MP_APXS=> /usr/sbin/apxs MP_COMPAT_1X => 1 MP_GENERATE_XS => 1 MP_LIBNAME => mod_perl MP_USE_DSO => 1 MP_USE_STATIC => 1 *** /usr/sbin/httpd -V Server version: Apache/2.0.47 Server built: Oct 23 2003 06:48:44 Server's Module Magic Number: 20020903:4 Architecture: 32-bit 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 HTTPD_ROOT="/etc/httpd" -D SUEXEC_BIN="/usr/sbin/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" *** /usr/local/bin/perl -V Summary of my perl5 (revision 5.0 version 8 subversion 2) configuration: Platform: osname=linux, osvers=2.4.22-1.2115.nptl, archname=i686-linux uname='linux nac1.mon.dsh.at 2.4.22-1.2115.nptl #1 wed oct 29 15:31:21 est 2003 i686 athlon i386 gnulinux ' config_args='-de' hint=recommended, useposix=true, d_sigaction=define usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef useperlio=define d_sfio=undef uselargefiles=define usesocks=undef use64bitint=undef use64bitall=undef uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cc', ccflags ='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm', optimize='-O3', cppflags='-fno-strict-aliasing -I/usr/local/include -I/usr/include/gdbm' ccversion='', gccversion='3.3.2 20031022 (Red Hat Linux 3.3.2-1)', 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 =' -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc libc=/lib/libc-2.3.2.so, so=so, useshrplib=false, libperl=libperl.a gnulibc_version='2.3.2' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic' cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib' Characteristics of this binary (from libperl): Compile-time options: USE_LARGE_FILES Built under linux Compiled at Nov 11 2003 12:52:54 %ENV: PERL_LWP_USE_HTTP_10="1" @INC: /usr/local/lib/perl5/5.8.2/i686-linux /usr/local/lib/perl5/5.8.2 /usr/local/lib/perl5/site_perl/5.8.2/i686-linux /usr/local/lib/perl5/site_perl/5.8.2 /usr/local/lib/perl5/site_perl . 3. This is the core dump trace: (if you get a core dump): I tried but I can't catch any (I don't know and didn't manage to find out which directory has to be writeable for the apache2 process under Embperl). This report was generated by t/REPORT on Tue Nov 11 13:00:29 2003 GMT. -- Reporting bugs: http://perl.apache.org/bugs/ Mail list info: http://perl.apache.org/maillist/modperl.html
Re: [mp2] segfault when generating graphs with GD::Graph under Embperl
No I don't know...the embperl page calls another embperl page which generates the graph and returns the link to the graph as html tag Thanks, Alex Von: Randy Kobes <[EMAIL PROTECTED]> am 13.11.2003 05:48 An: Alexander Hartmaier/DEBIS/EDVG/[EMAIL PROTECTED] Kopie:[EMAIL PROTECTED] Thema:Re: [mp2] segfault when generating graphs with GD::Graph under Embperl On Tue, 11 Nov 2003, Alexander Hartmaier wrote: > Hi! > > 1. Problem Description: > > My apache child crash with a segfault when I call a page > which generates a graph using the perl module GD::Graph. > > My system specs are: > > Fedora Core 1 > httpd-2.0.47 (from fedora, also tried with self-compiled 2.0.48) > mod_perl-1.99_11 (the final version, self-compiled) > embperl-2.0b10 (current cvs snapshot, self-compiled) > perl-5.8.1 (from fedora, also tried with self-compiled 5.8.2) > gd-2.0.15 (from fedora, also tried with self-compiled 2.0.15) > freetype-2.1.4 (from fedora, also tried with self-compiled 2.1.5) > > All perl modules are the newest version from CPAN. Do you know if an anlagous page outside of Embperl, using either ModPerl::Registry or a mod_perl content handler, also segfaults with GD::Graph? -- best regards, randy kobes *1* -- Reporting bugs: http://perl.apache.org/bugs/ Mail list info: http://perl.apache.org/maillist/modperl.html
Antwort: Re: [mp2] segfault when generating graphs with GD::Graph under Embperl
Thats the output I got: Program received signal SIGSEGV, Segmentation fault. 0x006bc582 in ?? () (gdb) (gdb) (gdb) BT #0 0x006bc582 in ?? () #1 0x00603c44 in ?? () #2 0x0106 in ?? () #3 0x005d4aa6 in ?? () #4 0x010a6940 in ?? () #5 0x0ab5c5bc in ?? () #6 0x41414141 in ?? () #7 0xbfe6e9a8 in ?? () #8 0x00fdebdd in ?? () #9 0x41414141 in ?? () #10 0x0a8be838 in ?? () #11 0x006039e4 in ?? () #12 0x0ab5c5bc in ?? () #13 0x0aa8d29c in ?? () #14 0xbfe6e9c8 in ?? () #15 0x005e2493 in ?? () #16 0x0ab5c5bc in ?? () #17 0x004c1410 in ?? () #18 0x0a8be838 in ?? () Is THIS really useful? Should I compile with debugging symbols? If yes what? apache or mod_perl? or embperl? Thanks, Alex Von: Gerald Richter <[EMAIL PROTECTED]> am 12.11.2003 07:55 An: Alexander Hartmaier/DEBIS/EDVG/[EMAIL PROTECTED], [EMAIL PROTECTED] Kopie:[EMAIL PROTECTED] Thema:Re: [mp2] segfault when generating graphs with GD::Graph under Embperl > > 3. This is the core dump trace: (if you get a core dump): > > I tried but I can't catch any (I don't know and didn't manage to find out which > directory has to be writeable for the apache2 process under Embperl). > Please try to start your httpd under gdb: gdb /path/to/httpd set args -X -f /path/to/httpd.conf r Now request the page that segfaults, gdb should show the segfault, then type BT and you should get the backtrace. Gerald P.S. -X tell Apache to only start one process, which is better for debugging *2* -- Reporting bugs: http://perl.apache.org/bugs/ Mail list info: http://perl.apache.org/maillist/modperl.html
Antwort: Re: Antwort: Re: [mp2] segfault when generating graphs with GD::Graph under Embperl
compiled mod_perl and embperl with debugging option. output is this: # gdb /usr/sbin/httpd GNU gdb Red Hat Linux (5.3.90-0.20030710.41rh) Copyright 2003 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-redhat-linux-gnu"...(no debugging symbols found)...Using host libthread_db library "/lib/libthread_db.so.1". (gdb) set args -X (gdb) r Starting program: /usr/sbin/httpd -X Program received signal SIGSEGV, Segmentation fault. 0x002a9582 in ?? () (gdb) BT #0 0x002a9582 in ?? () #1 0x009d5c44 in ?? () #2 0x0106 in ?? () #3 0x009a6aa6 in ?? () #4 0x005e3940 in ?? () #5 0x09f72cf4 in ?? () (gdb) Doesn't look like a better output than without debugging option... I never did this before. Is something missing? THX Alex Von: Gerald Richter <[EMAIL PROTECTED]> am 13.11.2003 15:44 An: Alexander Hartmaier/DEBIS/EDVG/[EMAIL PROTECTED] Kopie:[EMAIL PROTECTED], [EMAIL PROTECTED] Thema:Re: Antwort: Re: [mp2] segfault when generating graphs with GD::Graph under Embperl > > Should I compile with debugging symbols? Yes > If yes what? apache or mod_perl? or embperl? > mod_perl and Embperl For Embperl do perl Makefile.PL debug I don't have in mind the Makefile.PL flag for mod_perl, but you surly find it in the docs :-) Gerald > Thanks, Alex > > > > > Von: Gerald Richter <[EMAIL PROTECTED]> am 12.11.2003 07:55 > > > > An: Alexander Hartmaier/DEBIS/EDVG/[EMAIL PROTECTED], > [EMAIL PROTECTED] > Kopie:[EMAIL PROTECTED] > > Thema:Re: [mp2] segfault when generating graphs with GD::Graph > under Embperl > > >> >> 3. This is the core dump trace: (if you get a core dump): >> >> I tried but I can't catch any (I don't know and didn't manage to >> find out which directory has to be writeable for the apache2 process >> under Embperl). >> > > > Please try to start your httpd under gdb: > > gdb /path/to/httpd > set args -X -f /path/to/httpd.conf > r > > Now request the page that segfaults, gdb should show the segfault, > then type > > BT > > and you should get the backtrace. > > Gerald > > P.S. -X tell Apache to only start one process, which is better for > debugging > > *2* -- Gerald Richter ecos electronic communication services gmbh IT-Securitylösungen * dynamische Webapplikationen * Consulting Post: Tulpenstrasse 5 D-55276 Dienheim b. Mainz E-Mail: [EMAIL PROTECTED] Voice: +49 6133 939-122 WWW:http://www.ecos.de/ Fax: +49 6133 939-333 -- | | ECOS BB-5000 Firewall- und IT-Security Appliance: www.bb-5000.info | +- *1* -- Reporting bugs: http://perl.apache.org/bugs/ Mail list info: http://perl.apache.org/maillist/modperl.html
Re: [mp2] segfault when generating graphs with GD::Graph under Embperl
Hi Guys!
Another day, another try...another segfault ;-(
(gdb) run -X
Starting program: /usr/sbin/httpd -X
Program received signal SIGSEGV, Segmentation fault.
0x00e89582 in ?? ()
(gdb)
(gdb)
(gdb) BT
#0 0x00e89582 in ?? ()
#1 0x006e8c44 in ?? ()
#2 0x0106 in ?? ()
#3 0x006b9aa6 in ?? ()
#4 0x00508940 in ?? ()
#5 0x09c59c74 in ?? ()
#6 0x41414141 in ?? ()
#7 0xbff90488 in ?? ()
#8 0x00440bdd in ?? ()
#9 0x41414141 in ?? ()
#10 0x0968542c in ?? ()
#11 0x006e89e4 in ?? ()
#12 0x09c59c74 in ?? ()
#13 0x09b89b40 in ?? ()
#14 0xbff904a8 in ?? ()
#15 0x006c7493 in ?? ()
#16 0x09c59c74 in ?? ()
#17 0x00d3a410 in ?? ()
#18 0x0968542c in ?? ()
I rewrote the smaller one of the graph-generating epl's as perl code.
This is how i call the embperl page:
[-
Execute('../call/flow-graph.epl', "$date", "src");
Execute('../call/flow-graph.epl', "$date", "dest");
-]
And this the mod_perl way:
[-
Execute({inputfile => '../call/flow-graph.pl', syntax => 'Perl', param =>
["$date", 'src']});
Execute({inputfile => '../call/flow-graph.pl', syntax => 'Perl', param =>
["$date", 'dest']});
-]
Both lead to a segfault.
BUT:
If i call flow-graph.pl directly from the browser the page works!!!
@Martien: I forwarded the mail to you too because maybe you know something about
the problem as it occurs only with your GD::Graph module.
Thanks, Alex
Von: Stas Bekman <[EMAIL PROTECTED]> am 13.11.2003 22:41
An: Gerald Richter <[EMAIL PROTECTED]>
Kopie:Alexander Hartmaier/DEBIS/EDVG/[EMAIL PROTECTED], [EMAIL PROTECTED],
[EMAIL PROTECTED]
Thema:Re: Antwort: Re: Antwort: Re: [mp2] segfault when generating graphs
with GD::Graph under Embperl
Gerald Richter wrote:
> Hi Stas,
>
>>There is an easy way to work around it. Run the program under gdb and
>>it'll remember the trace even the memory (frames) gets corrupted.
>>
>>gdb /path/to/httpd
>>gdb> run -X
>>issue a request here and gdb will tell you that you've got a segfault
>> bt
>>will give you the trace.
>>
>
>
> This is excatly what we have done and which gives the above trace with does
> not contain any usefull informations ...
Sorry, Gerald. I've missed that detail then.
In which case you need to try to manually step through guessing some
breakpoints where things could go wrong.
__
Stas BekmanJAm_pH --> Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide ---> http://perl.apache.org
mailto:[EMAIL PROTECTED] http://use.perl.org http://apacheweek.com
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*2*
--
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Re: [mp2] segfault when generating graphs with GD::Graph under Embperl
snip from httpd.conf: SetHandler perl-script PerlResponseHandler ModPerl::Registry PerlOptions +ParseHeaders Options +ExecCGI Yours sincerly Alexander Hartmaier T-Systems T-Systems Austria TCS/Network Monitoring & Security Specialist address: Hofmühlgasse 3-5, 1060 Wien telephone: +43 (0)57057 - 4320 fax: +43 (0)57057 - 4152 mobile: +43 (0)676 8642 - 4320 mail: [EMAIL PROTECTED] Internet: http://www.t-systems.at Von: Gerald Richter <[EMAIL PROTECTED]> am 14.11.2003 12:38 An: Alexander Hartmaier/DEBIS/EDVG/[EMAIL PROTECTED], Stas Bekman <[EMAIL PROTECTED]>, [EMAIL PROTECTED] Kopie:[EMAIL PROTECTED], [EMAIL PROTECTED] Thema:Re: [mp2] segfault when generating graphs with GD::Graph under Embperl > > If i call flow-graph.pl directly from the browser the page works!!! > How is the file run when you call it directly, as CGI or via Apache::Registry ? Gerald -- Gerald Richter ecos electronic communication services gmbh IT-Securitylösungen * dynamische Webapplikationen * Consulting Post: Tulpenstrasse 5 D-55276 Dienheim b. Mainz E-Mail: [EMAIL PROTECTED] Voice: +49 6133 939-122 WWW:http://www.ecos.de/ Fax: +49 6133 939-333 -- | | ECOS BB-5000 Firewall- und IT-Security Appliance: www.bb-5000.info | +- *2* -- Reporting bugs: http://perl.apache.org/bugs/ Mail list info: http://perl.apache.org/maillist/modperl.html
