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From: "Gerald Richter" <richter@ecos.de>
To: "'Dan Wilga'" <dwilga@MtHolyoke.edu>, <embperl@perl.apache.org>
Subject: RE: Segfault or no content
Date: Wed, 9 Mar 2005 06:48:19 +0100
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Hi,

> 
> Now I only ever get the second version (no content from .epl 
> pages, and "/perl-status?Embperl" crashes.)
> 

The segfault of the perl-status seems to be a bug in Embperl (I will check
this later on), but I don't expect that it has something to do with getting
no content.

I would try

A) use Embperl configuration directives directly (without setenv and
perlsetenv)

B) try plain Embperl e.g. PerlHandler Embperl instead of Embperl::Object

Then we can see where the problem might be

Gerald


> 
> 
> >  > -----Original Message-----
> >>  From: Dan Wilga [mailto:dwilga@MtHolyoke.edu]
> >>  Sent: Tuesday, March 08, 2005 7:28 PM
> >>  To: embperl@perl.apache.org
> >>  Subject: Segfault or no content
> >>
> >>  I am getting a consistent segfault in Embperl, that I'd like
> >>  some help in diagnosing. I am using:
> >>
> >>  RHEL AS 4, kernel 2.6.11
> >>  with these things I compiled myself:
> >>     apache 2.0.53
> >>     perl 5.8.6
> >>     mod_perl-2.0.0-RC4
> >>     Embperl 2.0rc2
> >>
> >>  The problem happens with earlier versions of everything, as
> >>  well (even Emb 1.x). Here is the relevant section of httpd.conf:
> >>
> >>  AddType         text/html .epl
> >>  LoadModule      embperl_module
> >>  /usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/Embperl/Embperl.so
> >>  Embperl_UseEnv  on
> >>  SetEnv          EMBPERL_DEBUG 0
> >>  SetEnv          EMBPERL_APPNAME lottery
> >>  SetEnv          EMBPERL_SESSION_HANDLER_CLASS no
> >>  PerlSetEnv      EMBPERL_SESSION_HANDLER_CLASS no
> >>
> >>  <Files *.epl>
> >>     PerlSetEnv    EMBPERL_SESSION_HANDLER_CLASS no
> >>     SetHandler    perl-script
> >>     PerlResponseHandler   Embperl::Object
> >>     Options       ExecCGI
> >>  </Files>
> >>
> >>  <Location /lottery>
> >>     DirectoryIndex index.epl index.html index.shtml
> >>  default.html blocked.html
> >>     PerlSetEnv    EMBPERL_OBJECT_BASE hello.epl
> >>     PerlSetEnv    EMBPERL_FILESMATCH "\.epl$"
> >>     PerlResponseHandler   Embperl::Object
> >>  </Location>
> >>
> >>  The above config uses "hello.epl", which is just:
> >>
> >>  <HTML><HEAD></HEAD><BODY>
> >>  [+ "Hello world!" +]
> >>  </BODY></HTML>
> >>
> >>  If I do not include a "use Embperl" line in my startup
> >>  script, then the first request for a ".epl" file works fine,
> >>  but the second request for the *same page* will segfault.
> >>  This is the output from a gdb run with "-X -DSSL":
> >>
> >>  Program received signal SIGSEGV, Segmentation fault.
> >>  [Switching to Thread -1208875328 (LWP 30771)]
> >>  0xb7e2fb52 in S_hv_fetch_common () from 
> /etc/httpd/modules/mod_perl.so
> >>  (gdb) bt
> >>  #0  0xb7e2fb52 in S_hv_fetch_common () from
> >>  /etc/httpd/modules/mod_perl.so
> >>  #1  0xb7e31000 in Perl_hv_fetch () from 
> /etc/httpd/modules/mod_perl.so
> >>  #2  0xb7b93367 in EMBPERL2_GetHashValueStr ()
> >>      from
> >>  /usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/Embperl/Embperl.so
> >>  #3  0xb7b9f0a1 in embperl_GetCGIReqConfig ()
> >>      from
> >>  /usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/Embperl/Embperl.so
> >>  #4  0xb7bb6c91 in embperl_GetApacheReqConfig ()
> >>      from
> >>  /usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/Embperl/Embperl.so
> >>  #5  0xb7b9b1c2 in embperl_SetupRequest ()
> >>      from
> >>  /usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/Embperl/Embperl.so
> >>  #6  0xb7b9db70 in embperl_InitRequest ()
> >>      from
> >>  /usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/Embperl/Embperl.so
> >>  #7  0xb7b86bff in XS_Embperl__Req_InitRequest ()
> >>      from
> >>  /usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/Embperl/Embperl.so
> >>  #8  0xb7e3ace8 in Perl_pp_entersub () from
> >>  /etc/httpd/modules/mod_perl.so
> >>  #9  0xb7e34632 in Perl_runops_standard () from
> >>  /etc/httpd/modules/mod_perl.so #10 0xb7dd7fe9 in Perl_call_sv
> >>  () from /etc/httpd/modules/mod_perl.so
> >>  #11 0xb7dbe88f in modperl_callback () from
> >>  /etc/httpd/modules/mod_perl.so
> >>  #12 0xb7dbefa5 in modperl_callback_run_handlers ()
> >>      from /etc/httpd/modules/mod_perl.so
> >>  #13 0xb7dbf343 in modperl_callback_per_dir ()
> >>      from /etc/httpd/modules/mod_perl.so
> >>  #14 0xb7dba7a5 in modperl_response_handler_cgi ()
> >>      from /etc/httpd/modules/mod_perl.so
> >>  #15 0x080672ce in ap_run_handler (r=0x8d45740) at config.c:152
> >>  #16 0x08067699 in ap_invoke_handler (r=0x8d45740) at config.c:364
> >>  #17 0x08064ee5 in ap_process_request (r=0x8d45740) at
> >>  http_request.c:249
> >>  #18 0x08060bb1 in ap_process_http_connection (c=0x8d37200) at
> >>  http_core.c:251
> >  > #19 0x0806f4e2 in ap_run_process_connection (c=0x8d37200) at
> >>  connection.c:43 #20 0x08065aa9 in child_main
> >>  (child_num_arg=0) at prefork.c:610
> >>  #21 0x08065c9d in make_child (s=0x809be58, slot=0) at 
> prefork.c:650
> >>  #22 0x08065d64 in startup_children (number_to_start=5) at
> >>  prefork.c:722
> >>  #23 0x08066437 in ap_mpm_run (_pconf=0xbffff500,
> >>  plog=0x80c4150, s=0xbffff504)
> >>       at prefork.c:941
> >>  #24 0x0806b4e7 in main (argc=3, argv=0xbffff6a4) at main.c:618
> >>
> >>  This is similar to a problem encountered in this thread:
> >>
> >>     http://www2.ecos.de/~mailarc/embperl/2004-04/msg00110.html
> >>
> >>  the solution for which was to include "use Embperl" in the
> >>  startup script. But if I do this, then:
> >>
> >>  - web pages which use Embperl (ending in .epl) return no
> >>  content and no errors
> >  > - and, the perl-status URL for Embperl 
> [hostname/perl-status?Embperl]
> >>  segfaults:
> >>
> >>  Program received signal SIGSEGV, Segmentation fault.
> >>  [Switching to Thread -1208875328 (LWP 16726)]
> >>  0xb7b989d7 in EMBPERL2_mgGetCurrNode ()
> >>      from
> >>  /usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/Embperl/Embperl.so
> >>  (gdb) bt
> >>  #0  0xb7b989d7 in EMBPERL2_mgGetCurrNode ()
> >>      from
> >>  /usr/lib/perl5/site_perl/5.8.6/i686-linux/auto/Embperl/Embperl.so
> >>  #1  0xb7e273b2 in Perl_mg_get () from 
> /etc/httpd/modules/mod_perl.so
> >>  #2  0xb7e53f7f in Perl_sv_setsv_flags () from
> >>  /etc/httpd/modules/mod_perl.so
> >>  #3  0xb7e559ca in Perl_sv_mortalcopy () from
> >>  /etc/httpd/modules/mod_perl.so
> >>  #4  0xb7e729ad in Perl_pp_leavetry () from
> >>  /etc/httpd/modules/mod_perl.so
> >>  #5  0xb7e34632 in Perl_runops_standard () from
> >>  /etc/httpd/modules/mod_perl.so
> >>  #6  0xb7dd7fe9 in Perl_call_sv () from 
> /etc/httpd/modules/mod_perl.so
> >>  #7  0xb7dbe88f in modperl_callback () from
> >>  /etc/httpd/modules/mod_perl.so
> >>  #8  0xb7dbefa5 in modperl_callback_run_handlers ()
> >>      from /etc/httpd/modules/mod_perl.so
> >>  #9  0xb7dbf343 in modperl_callback_per_dir ()
> >>      from /etc/httpd/modules/mod_perl.so
> >>  #10 0xb7dba7a5 in modperl_response_handler_cgi ()
> >>      from /etc/httpd/modules/mod_perl.so
> >>  #11 0x080672ce in ap_run_handler (r=0x8e2bca8) at config.c:152
> >>  #12 0x08067699 in ap_invoke_handler (r=0x8e2bca8) at config.c:364
> >>  #13 0x08064ee5 in ap_process_request (r=0x8e2bca8) at
> >>  http_request.c:249
> >>  #14 0x08060bb1 in ap_process_http_connection (c=0x8e05088) at
> >>  http_core.c:251
> >>  #15 0x0806f4e2 in ap_run_process_connection (c=0x8e05088) at
> >>  connection.c:43
> >>  #16 0x08065aa9 in child_main (child_num_arg=0) at prefork.c:610
> >>  #17 0x08065c9d in make_child (s=0x809be58, slot=0) at 
> prefork.c:650
> >>  #18 0x08065d64 in startup_children (number_to_start=5) at
> >>  prefork.c:722
> >>  #19 0x08066437 in ap_mpm_run (_pconf=0xbffff500,
> >>  plog=0x80c4150, s=0xbffff504)
> >>       at prefork.c:941
> >>  #20 0x0806b4e7 in main (argc=3, argv=0xbffff6a4) at main.c:618
> >>
> >>  Any ideas?
> >>  --
> >>  Dan Wilga                                         
> dwilga@mtholyoke.edu
> >>  Web Administrator                             
> http://www.mtholyoke.edu
> >>  Mount Holyoke College                                Tel: 
> 413-538-3027
> >>  South Hadley, MA  01075            "Who left the cake out in
> >>  the rain?"
> >>
> >>  
> ---------------------------------------------------------------------
> >>  To unsubscribe, e-mail: embperl-unsubscribe@perl.apache.org
> >>  For additional commands, e-mail: embperl-help@perl.apache.org
> >>
> >>
> >
> >
> >---------------------------------------------------------------------
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> 
> 
> -- 
> Dan Wilga                                         dwilga@mtholyoke.edu
> Web Administrator                             http://www.mtholyoke.edu
> Mount Holyoke College                                Tel: 413-538-3027
> South Hadley, MA  01075            "Who left the cake out in 
> the rain?"
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: embperl-unsubscribe@perl.apache.org
> For additional commands, e-mail: embperl-help@perl.apache.org
> 
> 


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