Apache Blank Pages

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Hello,
=20
I have a bizarre problem I'm hoping someone could give me some =
suggestions with.
=20
I have a couple of MP2 scripts running on a server, they are both =
similar in use of modules and structure. Without any recent changes, one =
of the scripts is producing a blank apache page on SOME requests.
=20
It's not always the same function, it can happen to any of the function =
calls contained in the script.
=20
When the blank page happens there is nothing in either the access log or =
the error log of that virtual host (like the request never made it that =
far).
=20
In the default error log I will get something like
=20
[notice] child pid 11497 exit signal Aborted (6)
=20
Sometimes (but not always), I'll see
=20
*** glibc detected *** malloc(): memory corruption: 0x09c120f8 ***
=20
There is also no consistency to the blank page, sometimes you hit the =
URL and you get the content, sometimes you get a blank page, sometimes 1 =
refresh on the blank page gives you content, other times it can take 3 - =
7 refreshes before the content comes.
=20
I've been trying to pull apart my script piece by piece in the hopes =
that I could at least narrow it down to some specific section but I'm =
not having a lot of luck.
=20
Any thoughts on how I could debug this better?
=20
TIA!

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Re: Apache Blank Pages

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It seems pretty clear the blank pages are from the apache children dieing
badly (hence the errors). I would make an educated guess based on the
malloc error that your ram is bad. Try running your app on a different box
and see if you get the same errors.

On Jan 12, 2010 7:19 AM, "cfaust-dougot" wrote:

Hello,

I have a bizarre problem I'm hoping someone could give me some suggestions
with.

I have a couple of MP2 scripts running on a server, they are both similar in
use of modules and structure. Without any recent changes, one of the scripts
is producing a blank apache page on SOME requests.

It's not always the same function, it can happen to any of the function
calls contained in the script.

When the blank page happens there is nothing in either the access log or the
error log of that virtual host (like the request never made it that far).

In the default error log I will get something like

[notice] child pid 11497 exit signal Aborted (6)

Sometimes (but not always), I'll see

*** glibc detected *** malloc(): memory corruption: 0x09c120f8 ***

There is also no consistency to the blank page, sometimes you hit the URL
and you get the content, sometimes you get a blank page, sometimes 1 refresh
on the blank page gives you content, other times it can take 3 - 7 refreshes
before the content comes.

I've been trying to pull apart my script piece by piece in the hopes that I
could at least narrow it down to some specific section but I'm not having a
lot of luck.

Any thoughts on how I could debug this better?

TIA!

--0016e64ca7e6176fee047cfa6968
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Content-Transfer-Encoding: quoted-printable

It seems pretty clear the blank pages are from the apache children diein=
g badly (hence the errors).=A0 I would make an educated guess based on the =
malloc error that your ram is bad.=A0 Try running your app on a different b=
ox and see if you get the same errors.

On Jan 12, 2010 7:19 AM, "cfaust-dougot&q=
uot; <>=
wrote:

Hello,

=A0

I have a bizarre problem I'm hopin=
g someone could give me some suggestions with.

=A0

I have a couple of MP2 scripts running=
on a server, they are both similar in use of modules and structure. Withou=
t any recent changes, one of the scripts is producing a blank apache page o=
n SOME requests.

=A0

It's not always the same function,=
it can happen to any of the function calls contained in the script.=

=A0

When the blank page happens there is n=
othing in either the access log or the error log of that virtual host (like=
the request never made it that far).

=A0

In the default error log I will get so=
mething like

=A0

[notice] child pid 11497 exit signal Aborted (6)

=A0

Sometimes (but not always), I'll s=
ee

=A0

*** glibc detected *** malloc(): memory corruption: 0x09c120f8 *** v>

=A0

There is also no consistency to the bl=
ank page, sometimes you hit the URL and you get the content, sometimes you =
get a blank page, sometimes 1 refresh on the blank page gives you content, =
other times it can take 3 - 7 refreshes before the content comes. iv>

=A0

I've been trying to pull apart my =
script piece by piece in the hopes that I could at least narrow it down to =
some specific section but I'm not having a lot of luck.

=A0

Any thoughts on how I could debug this=
better?

=A0

TIA!

ote>

--0016e64ca7e6176fee047cfa6968--

RE: Apache Blank Pages

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Thanks for the reply William, at first I thought the same thing but as =
time went on and this only effected 1 virtual host and not the other =
(and the other had 10x the traffic), I didn't seem like hardware or =
config related.
=20
I've gotten a little further since my last post, but it still doesn't =
make sense.
=20
If I take the DB connection out of the script, it doesn't happen. I've =
added and removed it a few times just because I couldn't belive it.
=20
The DB is on another machine and both virtual hosts call the same =
machine (each virtual is a different DB on the dedicated DB server).
=20
The only difference in the DB connection call between the 2 scripts is =
that virtual host 1 calls it via a custom package (as other scripts need =
the same DB) - this is the site that works.
=20
Virtual Host 2 makes the connection within "sub handler" and that's the =
one that doesn't work.
=20
No closer to a solution though - any method I try to use to connect to =
the DB from VH2 results in this problem.
=20
Still doesn't make a lot of sense.
=20
=20
=20
=20
=20
________________________________

From: William T [mailto:dietbuddha@gmail.com]
Sent: Tue 1/12/2010 11:47 AM
To: cfaust-dougot
Cc: modperl@perl.apache.org
Subject: Re: Apache Blank Pages



It seems pretty clear the blank pages are from the apache children =
dieing badly (hence the errors). I would make an educated guess based =
on the malloc error that your ram is bad. Try running your app on a =
different box and see if you get the same errors.


On Jan 12, 2010 7:19 AM, "cfaust-dougot" wrote:
=09
=09
Hello,
=20
I have a bizarre problem I'm hoping someone could give me some =
suggestions with.
=20
I have a couple of MP2 scripts running on a server, they are both =
similar in use of modules and structure. Without any recent changes, one =
of the scripts is producing a blank apache page on SOME requests.
=20
It's not always the same function, it can happen to any of the function =
calls contained in the script.
=20
When the blank page happens there is nothing in either the access log =
or the error log of that virtual host (like the request never made it =
that far).
=20
In the default error log I will get something like
=20
[notice] child pid 11497 exit signal Aborted (6)
=20
Sometimes (but not always), I'll see
=20
*** glibc detected *** malloc(): memory corruption: 0x09c120f8 ***
=20
There is also no consistency to the blank page, sometimes you hit the =
URL and you get the content, sometimes you get a blank page, sometimes 1 =
refresh on the blank page gives you content, other times it can take 3 - =
7 refreshes before the content comes.
=20
I've been trying to pull apart my script piece by piece in the hopes =
that I could at least narrow it down to some specific section but I'm =
not having a lot of luck.
=20
Any thoughts on how I could debug this better?
=20
TIA!


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Re: Apache Blank Pages

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what is your apache's mpm? worker or prefork?

Our site sometimes also rise similar error(like glibc detected ... in
error log ) under worker mpm.

*陈建春 | ChenJianchun*
傲游Web应用部
E-mail: chenjch@maxthon.net

*Maxthon^® * --每个人的互联网中心! 上网从傲游开始!
傲游天下科技有限公司(中国) | www.maxthon.cn


*诚信、创新、务实、奋斗！*



cfaust-dougot 写道:
> Hello,
>
> I have a bizarre problem I'm hoping someone could give me some
> suggestions with.
>
> I have a couple of MP2 scripts running on a server, they are both
> similar in use of modules and structure. Without any recent changes,
> one of the scripts is producing a blank apache page on SOME requests.
>
> It's not always the same function, it can happen to any of the
> function calls contained in the script.
>
> When the blank page happens there is nothing in either the access log
> or the error log of that virtual host (like the request never made it
> that far).
>
> In the default error log I will get something like
>
> [notice] child pid 11497 exit signal Aborted (6)
>
> Sometimes (but not always), I'll see
>
> *** glibc detected *** malloc(): memory corruption: 0x09c120f8 ***
>
> There is also no consistency to the blank page, sometimes you hit the
> URL and you get the content, sometimes you get a blank page, sometimes
> 1 refresh on the blank page gives you content, other times it can take
> 3 - 7 refreshes before the content comes.
>
> I've been trying to pull apart my script piece by piece in the hopes
> that I could at least narrow it down to some specific section but I'm
> not having a lot of luck.
>
> Any thoughts on how I could debug this better?
>
> TIA!

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Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit








what is your apache's mpm? worker or prefork?



Our site sometimes also rise similar error(like glibc detected ... in
error log ) under worker mpm.

RE: Apache Blank Pages

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It's prefork
=20
Apache/2.2.3 (Debian) PHP/4.4.4-8+etch6 mod_apreq2-20051231/2.6.0 =
mod_perl/2.0.2 Perl/v5.8.8
=20
I've isolated the problem, you guys will say I'm crazy but I can =
reproduce the results over and over again.
=20
If I try to connect to a DB in that 2nd virtual host I have the problem. =
If I make no connection then there is no problem. Also if I connect to =
the same DB that the 1st virtual host does, then there is no problem. =
It's only when I try to connect to another DB that the problem comes =
into play.
=20
That makes no sense to me, but I've been able to reproduce it 8 =
different times without fail.
=20
This problem started when I updated DBI and DBD:mysql to the latest =
version, although I can't see where the conflict is as I have the latest =
versions running on other machines without any issues.
=20
It's really bizarre!!
=20

________________________________

From: ??? [mailto:chenjch@maxthon.net]
Sent: Wed 1/13/2010 7:08 AM
To: cfaust-dougot
Cc: modperl@perl.apache.org
Subject: Re: Apache Blank Pages


what is your apache's mpm? worker or prefork?

Our site sometimes also rise similar error(like glibc detected ... in =
error log ) under worker mpm.



??? | ChenJianchun
??Web???
E-mail: chenjch@maxthon.net=20

Maxthon=AE --?????????! ???????!
??????????(??) | www.maxthon.cn =
=20

???????????!



cfaust-dougot ??:=20

Hello,
=20
I have a bizarre problem I'm hoping someone could give me some =
suggestions with.
=20
I have a couple of MP2 scripts running on a server, they are both =
similar in use of modules and structure. Without any recent changes, one =
of the scripts is producing a blank apache page on SOME requests.
=20
It's not always the same function, it can happen to any of the function =
calls contained in the script.
=20
When the blank page happens there is nothing in either the access log =
or the error log of that virtual host (like the request never made it =
that far).
=20
In the default error log I will get something like
=20
[notice] child pid 11497 exit signal Aborted (6)
=20
Sometimes (but not always), I'll see
=20
*** glibc detected *** malloc(): memory corruption: 0x09c120f8 ***
=20
There is also no consistency to the blank page, sometimes you hit the =
URL and you get the content, sometimes you get a blank page, sometimes 1 =
refresh on the blank page gives you content, other times it can take 3 - =
7 refreshes before the content comes.
=20
I've been trying to pull apart my script piece by piece in the hopes =
that I could at least narrow it down to some specific section but I'm =
not having a lot of luck.
=20
Any thoughts on how I could debug this better?
=20
TIA!


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