On Windows, Bugzilla crashes when accessing editparams.cgi with mod_perl enabled

RESOLVED WORKSFORME

Status

()

Bugzilla
Installation & Upgrading
RESOLVED WORKSFORME
10 years ago
7 years ago

People

(Reporter: Yann, Unassigned)

Tracking

2.23.4
x86
Windows 2000

Details

Attachments

(1 obsolete attachment)

(Reporter)

Description

10 years ago
User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1
Build Identifier: 

I installed mod_perl on windows.

Windows 2000
Apache 2.2.4 from apachelougne
Activestate 5.8.8.820
Mod_perl 2.0.3 from apachelounge
Bugzilla 2.23.4

It seems to work fine under common situations, but every time I click on the "Parameters" link, it crashes the apache child module.

It works fine under CGI.

Reproducible: Always

Steps to Reproduce:
1.use mod_perl
2.click on "Parameters" link
3.the child apache process restarts
Actual Results:  
Apache error:
[notice] Parent: child process exited with status 3221225725 -- Restarting.
(Reporter)

Updated

10 years ago
Version: unspecified → 2.23.4
(Reporter)

Updated

10 years ago
Component: Administration → Installation & Upgrading

Updated

10 years ago
Assignee: administration → installation
(Reporter)

Comment 1

10 years ago
I tested all Bugzilla features I could think of in 2.23.4 (except for emails), and this is the only place where this issue occurs.
(Reporter)

Updated

10 years ago
Summary: mod_perl crashes when going to "Parameters" page → mod_perl crashes only on editparams.cgi page

Comment 2

10 years ago
I can't reproduce this on Linux. Does it happen if you use the standard apache.org version of everything?
Severity: major → normal
(Reporter)

Comment 3

10 years ago
I will try this tomorrow and come back to you.
(Reporter)

Comment 4

10 years ago
Damn, couldn't get that tested today, hope by first half of next week. 
(Reporter)

Comment 5

10 years ago
(In reply to comment #2)
> I can't reproduce this on Linux. Does it happen if you use the standard
> apache.org version of everything?

OK, tested and same issue with standard Apache version of Apache and mod_perl.
Really strange that it crashes only on editparams.cgi ...

(Reporter)

Comment 6

10 years ago
I checked bug 370010 (size limit for mod_perl), and went on the documentation page (http://search.cpan.org/~pgollucci/mod_perl-2.0.3/docs/api/Apache2/SizeLimit.pod#Synopsis).

According to this page: 

"Win32
    Under mod_perl 1, SizeLimit provided basic functionality by using Win32::API to access process memory information. This worked because there was only one mod_perl thread. With mod_perl 2, Win32 runs a true threaded MPM, which unfortunately means that we can't tell the size of each interpreter. Win32 support is disabled until a solution for this can be found."

So shouldn't mod_perl be not recommended for Win32 at all in the release notes for 3.0?

Updated

10 years ago
Summary: mod_perl crashes only on editparams.cgi page → On Windows, Bugzilla crashes when accessing editparams.cgi with mod_perl enabled

Comment 7

10 years ago
I can confirm this problem. The mod_perl is currently unusable for Windows Apache 2.2 installation using Apache MPM winnt (http://httpd.apache.org/docs/2.2/mod/mpm_winnt.html).

At least it does not crash for the moment.


Error message on apache startup:
--------------------------

C:\Program Files\Apache Software Foundation\Apache2.2\bin>httpd.exe
Syntax error on line 154 of C:/Program Files/Apache Software Foundation/Apache2.
2/conf/httpd.conf:
Apache2::SizeLimit at the moment works only with non-threaded MPMs at C:/Perl/si
te/lib/Apache2/SizeLimit.pm line 51.
BEGIN failed--compilation aborted at C:/Perl/site/lib/Apache2/SizeLimit.pm line 98.
Compilation failed in require at C:/Bugzilla/mod_perl.pl line 33.
BEGIN failed--compilation aborted at C:/Bugzilla/mod_perl.pl line 33.
Compilation failed in require at (eval 3) line 1.

Comment 8

10 years ago
Max, looks like something which should be mentioned in the release notes if confirmed.
Keywords: relnote

Comment 9

10 years ago
Can you try it with Apache 2.0 and see if it works there? I've heard of various problems with Apache 2.2 and mod_perl 2.
(Reporter)

Comment 10

10 years ago
(In reply to comment #9)
> Can you try it with Apache 2.0 and see if it works there? I've heard of various
> problems with Apache 2.2 and mod_perl 2.

I wish I could, but Apache::SizeLimit got activated since I reported this bug, which prevents from running on Windows (it does not support Worker MPM).

I will try and test it by de-activating that line in mod_perl.cgi. But even if that works out, having no protection against RAM overflow sounds scary... any idea to work around that ?

(Reporter)

Comment 11

10 years ago
(In reply to comment #10)
> I wish I could, but Apache::SizeLimit got activated since I reported this bug,
> which prevents from running on Windows (it does not support Worker MPM).

I meant that basically Apache won't start because Apache::SizeLimit throws an error message that it cannot work on Worker MPM.
(Reporter)

Comment 12

10 years ago
(In reply to comment #9)
> Can you try it with Apache 2.0 and see if it works there? I've heard of various
> problems with Apache 2.2 and mod_perl 2.

Confirmed the issue is the same with Apache 2.0.
I isolated the issue in editparams.cgi to occur in the following code (does not know if it helps):


foreach my $panel (Bugzilla::Config::param_panels()) {
    eval("require Bugzilla::Config::$panel") || die $@;
    my @module_param_list = "Bugzilla::Config::${panel}"->get_param_list(1);
    my $item = { name => lc($panel),
                 current => ($current_panel eq lc($panel)) ? 1 : 0,
                 param_list => \@module_param_list,
                 sortkey => eval "\$Bugzilla::Config::${panel}::sortkey;"
               };
    push(@panels, $item);
    $current_module = $panel if ($current_panel eq lc($panel));
}

Comment 13

10 years ago
Added to relnotes in bug 379777.
Keywords: relnote

Updated

10 years ago
Status: UNCONFIRMED → NEW
Ever confirmed: true

Comment 14

8 years ago
Commenting Apache2::SizeLimit from mod_perl.pl makes it work somehow (its impossible(?) to track a threads memory usage so IMO its not fair to bail on this). Then I also ran into the editparams.cgi problem, made me extremely confused. By trial and error I discovered: There is a a weird limit on 859 chars per string during template generation, and multiline strings (typically html) exceed 859 chars. I have tried to find where this limit comes from, but no luck. The workaround is simple thou, don't use multiline html in templates (dependencygraph.html.tmpl, mta.html.tmpl etc.) but concat lines:
  mail_delivery_method => "Defines how email is sent, or if it is sent at all.<br> " _
"                           <ul> "_
"                             <li> "_

API monitoring gave me some sort of stack trace (last called is at bottom):
mod_perl.dll: modperl_callback
mod_perl.dll: modperl_handler_anon_get
perlXXX.dll: perl_hv_fetch
...
lots of calls, all internally in perlXXX.dll. Consumes lots of cpu and loads of I/O. Possibly infinite recursion and stack exhaustion. 
...
perlXXX.dll: perl_die

If I must guess I would say its perl's fault and not mod_perl, but who knows. Someone should probably report this bug to them:-)

Win XP
Apache 2.2.11 threaded MPM
Active Perl 5.8.9.825
mod_perl 2.0.4
Bugzilla 3.2.3

Comment 15

8 years ago
hardon: Thank you for tracking that down!! Since you have the data, could you report it to ActiveState at: http://bugs.activestate.com/ ?

Comment 16

8 years ago
It seems it has already have been fixed:-) I upgraded to ActivePerl 5.10.0.1004, and it seems to work fine there! Of maybe I was just lucky? Someone else should probably confirm before closing this bug.

Comment 17

8 years ago
(In reply to comment #16)
> It seems it has already have been fixed:-) I upgraded to ActivePerl
> 5.10.0.1004, and it seems to work fine there! Of maybe I was just lucky?

Yann, are things better on mod_perl with Perl 5.10?
Still does not work with Apache::SizeLimit as it currently does not support a multi-threaded environment.

PerlDoc of Apache2::SizeLimit
At this time, Apache2::SizeLimit does not support use under threaded
MPMs.  This is because there is no efficient way to get the memory
usage of a thread, or make a thread exit cleanly.

At present the module itself is doing the following:

die "Apache2::SizeLimit at the moment works only with non-threaded MPMs"
        if Apache2::MPM->is_threaded();

I suggest updating mod_perl.pl with the following line:

use if $^O ne 'MSWin32', 'Apache2::SizeLimit';

If memory usage is a problem use of "MaxRequestsPerChild" in apache config can be used in its place.
re comment 17

with Apache::SizeLimit disabled I have encountered no issues under 5.10
(Reporter)

Comment 20

8 years ago
(In reply to comment #19)
> with Apache::SizeLimit disabled I have encountered no issues under 5.10

Nice for you. The problem if I remember properly is that b.m.o when started using mod_perl had memory usage issue (8GB+). Hence the introduction of this Apache::SizeLimit parameter.

I would like to use mod_perl on Windows too, but "MaxRequestsPerChild" cannot guarantee memory hog won't happen afaik. This is an issue for production environment unfortunately.

Still let us know how it works over time (number of hits/users before memory jumps to high levels).
Created attachment 415394 [details] [diff] [review]
v1

(In reply to comment #20)
Will do Yann. I totally agree on the "cannot guarantee memory hog" comment. It is not a guarantee but with a period of proper monitoring or some good upfront load testing it should be possible to tune things to a reasonable level.

Posting this patch simply because this does allow mod_perl to work. Granted a it does require extra tuning and monitoring. But I think its a more reasonable statement in the notes than saying mod_perl doesn't work under win32.

Out of curiosity what would your concurrent request rate be by chance? A dedicated server or server cluster with 16-32GB of memory (fairly cheap nowadays) should be able to handle quite a lot. Granted cheap is relative..
Attachment #415394 - Flags: review?(mkanat)

Comment 22

8 years ago
Comment on attachment 415394 [details] [diff] [review]
v1

This patch belongs on another bug--it doesn't address the issue described in the Summary of this bug.
Attachment #415394 - Flags: review?(mkanat)
(In reply to comment #22)
> (From update of attachment 415394 [details] [diff] [review])
> This patch belongs on another bug--it doesn't address the issue described in
> the Summary of this bug.

True

Yann is comment 0 still occurring? Under windows + mod_perl + bugzilla 3.5.x I'm not seeing the issue.
Comment on attachment 415394 [details] [diff] [review]
v1

Attachment 415394 [details] [diff] moved to bug 532318
Attachment #415394 - Attachment is obsolete: true

Comment 25

7 years ago
Marking WORKSFORME based on mockodin's comment.
Status: NEW → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → WORKSFORME
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