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From Fred Moyer <f...@redhotpenguin.com>
Subject Re: first time debugging apache/mod_perl Seg fault
Date Mon, 13 Jul 2009 19:21:32 GMT
On Mon, Jul 13, 2009 at 12:15 PM, Alan McKay<alan.mckay@gmail.com> wrote:
> Hey folks,
>
> I'm running CentOS 5.2 with a custom built apache not from Yum.
>
> I am following instructions here
> http://perl.apache.org/docs/2.0/devel/debug/c.html#Getting_the_core_File_Dumped
>
> and here :
> http://perl.apache.org/docs/2.0/devel/debug/c.html#Analyzing_Dumped_Core_Files
>
> I have mod_perl built with symbols and reproduce my problem, but I'm
> not having much luck with gdb.  I really have no experience with this
> aspect of Linux so am shooting in the dark a bit here.
>
> I also have no idea whether I'm "threaded" or "unthreaded", so I tried
> both of the "curinfo" macros with no luck.

> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so

You're threaded.

What version of Apache and mod_perl are you running here?

What configuration options are you using to build apache?



> Here is the output of "bt full" which clearly shows a few "my_perl"
> entries.   But I'm just not clear how to find out what part of our
> Perl code is causing the issue.
>
> (gdb) bt full
> #0  0x0044e172 in Perl_cv_const_sv () from
> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
> No symbol table info available.
> #1  0x00442a7c in Perl_yylex () from
> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
> No symbol table info available.
> #2  0x0044b295 in Perl_yyparse () from
> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
> No symbol table info available.
> #3  0x004b8200 in Perl_pp_range () from
> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
> No symbol table info available.
> #4  0x004ba0b2 in Perl_pp_require () from
> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
> No symbol table info available.
> #5  0x004ba7ad in Perl_pp_dofile () from
> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
> No symbol table info available.
> #6  0x0048488f in Perl_runops_standard () from
> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
> No symbol table info available.
> #7  0x00424ffe in Perl_magicname () from
> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
> No symbol table info available.
> #8  0x00429806 in Perl_call_sv () from
> /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
> No symbol table info available.
> #9  0x00140a7f in modperl_callback (my_perl=0x9476458,
> handler=0xaccc268, p=0xaf2a840, r=0xaf2a880, s=0xad0bad0,
> args=0xbd473e8) at modperl_callback.c:101
>        items = <value optimized out>
>        cv = <value optimized out>
>        sp = (SV **) 0xafead24
>        status = 0
> #10 0x0014117a in modperl_callback_run_handlers (idx=6, type=4,
> r=0xaf2a880, c=0x0, s=0xad0bad0, pconf=0x0, plog=0x0, ptemp=0x0,
> run_mode=MP_HOOK_RUN_FIRST)
>    at modperl_callback.c:262
>        my_perl = (PerlInterpreter *) 0x9476458
>        interp = (modperl_interp_t *) 0xa965888
>        scfg = (modperl_config_srv_t *) 0x8d437b8
>        dcfg = (modperl_config_dir_t *) 0xaf2a2e0
>        rcfg = (modperl_config_req_t *) 0xaf2b5f0
>        handlers = (modperl_handler_t **) 0xaccc298
>        p = (apr_pool_t *) 0xaf2a840
>        av = (MpAV *) 0xaccc280
>        avp = <value optimized out>
>        i = 0
>        status = 0
>        desc = 0x158cd3 "PerlResponseHandler"
>        av_args = (AV *) 0xbd473e8
> #11 0x0014180a in modperl_callback_per_dir (idx=6, r=0xaf2a880,
> run_mode=MP_HOOK_RUN_FIRST) at modperl_callback.c:369
> No locals.
> #12 0x0013a79f in modperl_response_handler_run (r=0xaf2a880, finish=0)
> at mod_perl.c:1000
>        retval = <value optimized out>
> #13 0x0013a96b in modperl_response_handler_cgi (r=0xaf2a880) at mod_perl.c:1100
>        dcfg = (modperl_config_dir_t *) 0xaf2a2e0
>        h_stdin = (GV *) 0xc2d7a20
>        h_stdout = (GV *) 0xb4ba144
>        retval = -1
>        rc = <value optimized out>
>        rcfg = (modperl_config_req_t *) 0xaf2b5f0
>        my_perl = (PerlInterpreter *) 0x9476458
>        interp = (modperl_interp_t *) 0xa965888
> #14 0x08076a79 in ap_run_handler (r=0xaf2a880) at config.c:157
>        n = 6
>        rv = 40
> #15 0x08079be7 in ap_invoke_handler (r=0xaf2a880) at config.c:372
>        handler = 0x0
>        result = <value optimized out>
>        old_handler = 0xaccbe38 "perl-script"
>        ignore = <value optimized out>
> #16 0x08090798 in ap_process_request (r=0xaf2a880) at http_request.c:258
> ---Type <return> to continue, or q <return> to quit---
>        access_status = 0
> #17 0x0808da3b in ap_process_http_connection (c=0xaf1a9d8) at http_core.c:190
>        r = (request_rec *) 0xaf2a880
>        csd = (apr_socket_t *) 0x0
> #18 0x0807dab9 in ap_run_process_connection (c=0xaf1a9d8) at connection.c:43
>        n = 1
>        rv = 40
> #19 0x080a3dc5 in child_main (child_num_arg=<value optimized out>) at
> prefork.c:650
>        numdesc = 0
>        pdesc = (const apr_pollfd_t *) 0x0
>        current_conn = (conn_rec *) 0xaf1a9d8
>        csd = (void *) 0xaf1a840
>        ptrans = (apr_pool_t *) 0xaf1a800
>        allocator = (apr_allocator_t *) 0x9301738
>        status = <value optimized out>
>        i = <value optimized out>
>        lr = <value optimized out>
>        pollset = (apr_pollset_t *) 0xaf18850
>        sbh = (ap_sb_handle_t *) 0xaf18848
>        bucket_alloc = (apr_bucket_alloc_t *) 0xaf1c808
>        last_poll_idx = 0
> #20 0x080a4087 in make_child (s=0x8d2fd70, slot=28) at prefork.c:746
>        pid = 0
> #21 0x080a49e0 in ap_mpm_run (_pconf=0x8d070a8, plog=0x8d451a0,
> s=0x8d2fd70) at prefork.c:881
>        status = 0
>        pid = {pid = -1, in = 0x8d01250, out = 0x2, err = 0xd070a8}
>        child_slot = <value optimized out>
>        exitwhy = APR_PROC_EXIT
>        processed_status = <value optimized out>
>        index = <value optimized out>
>        remaining_children_to_start = 0
>        rv = <value optimized out>
> #22 0x08064645 in main (argc=147869856, argv=0xaf187f8) at main.c:740
>        c = 0 '\0'
>        configtestonly = 0
>        confname = 0x80ae357 "conf/httpd.conf"
>        def_server_root = 0x80ae367 "/usr/local/apache2"
>        temp_error_log = 0x0
>        error = <value optimized out>
>        process = (process_rec *) 0x8d05130
>        server_conf = <value optimized out>
>        pglobal = (apr_pool_t *) 0x8d050a0
>        pconf = (apr_pool_t *) 0x8d070a8
>        plog = (apr_pool_t *) 0x8d451a0
>        ptemp = (apr_pool_t *) 0x8d491b0
>        pcommands = (apr_pool_t *) 0x8d090b0
>        opt = (apr_getopt_t *) 0x8d09150
>        rv = 0
>        optarg = 0x3b6ff4 "\234m;"
> (gdb)
>
>
> --
> “Don't eat anything you've ever seen advertised on TV”
>         - Michael Pollan, author of "In Defense of Food"
>

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