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Posted to modperl@perl.apache.org by Foo Ji-Haw <jh...@extracktor.com> on 2005/09/13 04:51:32 UTC

Why does my MP2 crash intermittently?

Hello all,

I have set up my MP2 application, which in the course of development has been reasonably stable. But when I put it under reasonably load (I have a daemon with 5 threads that call it periodically, and I browse around the pages with 2 other collegues), sometimes I get this error (see attached for the actually screenshot):
The instruction at "0x280877f1" referenced memory at "0x515ee28". The memory coudl not be "read".

The application basically freezes at this point. Clicking on the OK button seems to bring MP2 back to operations immediately. Looking at the log, Apache seems to have restarted.

This is very annoying, as my app is generally ready to go, but intermittent errors like this makes it otherwise. Nothing else is capture in the log, so I don't know where to go to discover the culprit.

Can anyone please advise me on this? Appreciate it!

Re: Why does my MP2 crash intermittently?

Posted by Foo Ji-Haw <jh...@extracktor.com>.

Hello Stephane,

I've had a good tip from Mike (thanks Mike!) that the problem is Windows
related. Check out http://support.microsoft.com/?kbid=262490 for details.

Although they claimed that it is a pre-SP1 problem, I'm running SP4 on W2K
and I'm still seeing it. Will try the same setup on W2K3 and see if the
problem persists.

My situation seems to be worse than yours. I have the following already in
my httpd.conf:
PerlModule Apache2::Reload
PerlInitHandler Apache2::Reload

But it did not change anything.

----- Original Message ----- 
From: "Stephane GUIBOUD-RIBAUD" <st...@st.com>
To: "Foo Ji-Haw" <jh...@extracktor.com>
Cc: <mo...@perl.apache.org>
Sent: Tuesday, September 13, 2005 3:45 PM
Subject: Re: Why does my MP2 crash intermittently?


> I had the same problem. The only way to solve it was to use the
> Apache2::Reload module. By using this module, the apache that crashed is
> killed and a new process is started immediately. However, this not solve
> the real problem but the popup is not displayed.
>
> Moreover, I'm using Apache 2.0.54 and mod_perl 2.0.1 (precompiled
> version) on Windows XP and I had a lot of memory leak problem with the
> Apache::ASP module. This module causes also an internal server error
> when the cleanup_register handlers is called: it seems that Apache::ASP
> has detected mod_perl 2 at startup and went back to mod_perl 1 at
> sometime so he didn't call the right handler. Have you check your
> error_log ?
>
> Foo Ji-Haw wrote:
>
> > Hello all,
> >
> > I have set up my MP2 application, which in the course of development
> > has been reasonably stable. But when I put it under reasonably load (I
> > have a daemon with 5 threads that call it periodically, and I browse
> > around the pages with 2 other collegues), sometimes I get this error
> > (see attached for the actually screenshot):
> > The instruction at "0x280877f1" referenced memory at "0x515ee28". The
> > memory coudl not be "read".
> >
> > The application basically freezes at this point. Clicking on the OK
> > button seems to bring MP2 back to operations immediately. Looking at
> > the log, Apache seems to have restarted.
> >
> > This is very annoying, as my app is generally ready to go, but
> > intermittent errors like this makes it otherwise. Nothing else is
> > capture in the log, so I don't know where to go to discover the culprit.
> >
> > Can anyone please advise me on this? Appreciate it!
>
> -- 
> Stéphane GUIBOUD-RIBAUD                            STMicroelectronics
> HPC/PMG/AP3                                                  Grenoble
> Tel.: +33 (4) 76 585 246                               TINA: 041 5246
>
>

Re: Why does my MP2 crash intermittently?

Posted by Stephane GUIBOUD-RIBAUD <st...@st.com>.

I had the same problem. The only way to solve it was to use the 
Apache2::Reload module. By using this module, the apache that crashed is 
killed and a new process is started immediately. However, this not solve 
the real problem but the popup is not displayed.

Moreover, I'm using Apache 2.0.54 and mod_perl 2.0.1 (precompiled 
version) on Windows XP and I had a lot of memory leak problem with the 
Apache::ASP module. This module causes also an internal server error 
when the cleanup_register handlers is called: it seems that Apache::ASP 
has detected mod_perl 2 at startup and went back to mod_perl 1 at 
sometime so he didn't call the right handler. Have you check your 
error_log ?

Foo Ji-Haw wrote:

> Hello all,
>  
> I have set up my MP2 application, which in the course of development 
> has been reasonably stable. But when I put it under reasonably load (I 
> have a daemon with 5 threads that call it periodically, and I browse 
> around the pages with 2 other collegues), sometimes I get this error 
> (see attached for the actually screenshot):
> The instruction at "0x280877f1" referenced memory at "0x515ee28". The 
> memory coudl not be "read".
>  
> The application basically freezes at this point. Clicking on the OK 
> button seems to bring MP2 back to operations immediately. Looking at 
> the log, Apache seems to have restarted.
>  
> This is very annoying, as my app is generally ready to go, but 
> intermittent errors like this makes it otherwise. Nothing else is 
> capture in the log, so I don't know where to go to discover the culprit.
>  
> Can anyone please advise me on this? Appreciate it!

-- 
Stéphane GUIBOUD-RIBAUD                            STMicroelectronics
HPC/PMG/AP3                                                  Grenoble
Tel.: +33 (4) 76 585 246                               TINA: 041 5246

Re: Why does my MP2 crash intermittently?

Posted by Foo Ji-Haw <jh...@extracktor.com>.

Hello Mike,

You are right. I automatically assumed that this is a MP2 problem, when actually it is a Windows issue!

The strange thing is, that I'm already running on SP4 of Windows 2000. This problem should have been resolved by then. It is true that I do load lots of stuff via a db call. But normal contiguous calls to the page does not return errors; the error seems to be quite unpredictable.

I wonder if the problem will go away in Windows 2003...

Did anyone else face this issue as well? Or is it just me?
----- Original Message -----
From: Mike OK
To: Foo Ji-Haw ; modperl@perl.apache.org
Sent: Tuesday, September 13, 2005 11:04 AM
Subject: Re: Why does my MP2 crash intermittently?

Looks like you should have done a Google search. The problem looks to be an operating system error. Here is a quote from the Microsoft Knowledge base (http://support.microsoft.com/?kbid=262490)
"This behavior occurs because the operating system does not allocate a large enough buffer for the maximum string length permitted. When the data is greater than the buffer size, the Winlogon service terminates abnormally and your computer generates the error message. "

Gotta love Microsoft eh??? Mike
----- Original Message -----
From: Foo Ji-Haw
To: modperl@perl.apache.org
Sent: September 12, 2005 10:51 PM
Subject: Why does my MP2 crash intermittently?

Hello all,

I have set up my MP2 application, which in the course of development has been reasonably stable. But when I put it under reasonably load (I have a daemon with 5 threads that call it periodically, and I browse around the pages with 2 other collegues), sometimes I get this error (see attached for the actually screenshot):
The instruction at "0x280877f1" referenced memory at "0x515ee28". The memory coudl not be "read".

The application basically freezes at this point. Clicking on the OK button seems to bring MP2 back to operations immediately. Looking at the log, Apache seems to have restarted.

This is very annoying, as my app is generally ready to go, but intermittent errors like this makes it otherwise. Nothing else is capture in the log, so I don't know where to go to discover the culprit.

Can anyone please advise me on this? Appreciate it!

----------------------------------------------------------------------------

No virus found in this incoming message.
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Version: 7.0.344 / Virus Database: 267.10.21/96 - Release Date: 2005-09-10

Re: Why does my MP2 crash intermittently?

Posted by Mike OK <mi...@acorg.com>.

Gotta love Microsoft eh??? Mike
----- Original Message -----
From: Foo Ji-Haw
To: modperl@perl.apache.org
Sent: September 12, 2005 10:51 PM
Subject: Why does my MP2 crash intermittently?

Hello all,

The application basically freezes at this point. Clicking on the OK button seems to bring MP2 back to operations immediately. Looking at the log, Apache seems to have restarted.

Can anyone please advise me on this? Appreciate it!

------------------------------------------------------------------------------

No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.344 / Virus Database: 267.10.21/96 - Release Date: 2005-09-10

Re: Why does my MP2 crash intermittently?

Posted by Nikolay Ananiev <an...@thegdb.com>.

Hello,
I had a similar problem with mp2 on windows. I was using Visual Studio .NET
2002 to compile mod_perl and this
was the source of all evil. A bug in .NET.
I had to download service pack 1 for .NET 2002 from microsoft.com and
recompile mod_perl.

If this doesn't help you should supply a backtrace. (I hope you have visual
studio?)

First read this
http://perl.apache.org/docs/2.0/devel/debug/c.html#Analyzing_Dumped_Core_Files
then recompile your perl, apache and mod_perl with the debbuging flags.
Then start your visual studio.
Start your apache server and wait for the bad message window to appear
again,
and when it happens, click Cancel. A new window should
show up asking you whether to use VS to debbug the application - click OK.
Check "Native" for the "Program type to debug".
If the call stack doesn't appear go to Debug->Windows->Call Stack.
Then copy the stack and paste it here.
It should be something like this:

  USER32.DLL!77e41706()
  perl58.dll!win32_msgwait(interpreter * my_perl=0x01a43a64, unsigned long
count=0, void * * handles=0x00000000, unsigned long timeout=300000, unsigned
long * resultp=0x00000000)  Line 1950 + 0x18 C
  perl58.dll!win32_sleep(unsigned int t=300)  Line 2135 + 0x16 C
  perl58.dll!PerlProcSleep(IPerlProc * piPerl=0x015d2780, unsigned int
s=300)  Line 1656 + 0x9 C++
  perl58.dll!Perl_pp_sleep(interpreter * my_perl=0x01a43a64)  Line 4535 +
0xb C


>"Foo Ji-Haw" <jh...@extracktor.com> wrote in message
news:028801c5b80e$0cbec910$c801a8c0@nexpc...
>Hello all,
>
>I have set up my MP2 application, which in the course of development has
been reasonably stable. But when I put it under reasonably load (I have a
daemon with >5 threads that call it periodically, and I browse around the
pages with 2 other collegues), sometimes I get this error (see attached for
the actually screenshot):
>The instruction at "0x280877f1" referenced memory at "0x515ee28". The
memory coudl not be "read".
>
>The application basically freezes at this point. Clicking on the OK button
seems to bring MP2 back to operations immediately. Looking at the log,
Apache seems to have restarted.
>
>This is very annoying, as my app is generally ready to go, but intermittent
errors like this makes it otherwise. Nothing else is capture in the log, so
I don't know >where to go to discover the culprit.
>
>Can anyone please advise me on this? Appreciate it!