Re: Apache Blank Pages
On Wed, Jan 13, 2010 at 5:52 PM, cfaust-dougot cfa...@doyougot.com wrote: Below is what I currently call in startup, by any chance does anything pop out at you? Nope, those all look fine to me. Other wise I'll start going though them one at a time. A binary search is good for this sort of thing. - Perrin
RE: Apache Blank Pages
Thanks Perrin, Long story short, I'm in the process of moving to another machine. I wanted to ask you though, is there any modules I should stay away from loading in startup.pl? Should DBI and DBD be loaded within each script and not within startup? I've always been under the impression that if it was a module that I was going to be using in the majority of my scripts then I should put it in startup. Was that thinking wrong? TIA!!! From: Perrin Harkins [mailto:phark...@gmail.com] Sent: Thu 1/14/2010 4:30 PM To: cfaust-dougot Cc: modperl@perl.apache.org Subject: Re: Apache Blank Pages On Wed, Jan 13, 2010 at 5:52 PM, cfaust-dougot cfa...@doyougot.com wrote: Below is what I currently call in startup, by any chance does anything pop out at you? Nope, those all look fine to me. Other wise I'll start going though them one at a time. A binary search is good for this sort of thing. - Perrin
Re: Apache Blank Pages
On Thu, Jan 14, 2010 at 6:20 PM, cfaust-dougot cfa...@doyougot.com wrote: Long story short, I'm in the process of moving to another machine. I wanted to ask you though, is there any modules I should stay away from loading in startup.pl? Should DBI and DBD be loaded within each script and not within startup? You just need to avoid opening files or sockets before forking. It's fine to load DBI/DBD. I've always been under the impression that if it was a module that I was going to be using in the majority of my scripts then I should put it in startup. That's correct. - Perrin
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. *陈建春 | ChenJianchun* 傲游Web应用部 E-mail: chen...@maxthon.net mailto:chen...@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) http://www.maxthon.cn/ | www.maxthon.cn http://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!
RE: Apache Blank Pages
It's prefork 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 I've isolated the problem, you guys will say I'm crazy but I can reproduce the results over and over again. 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. That makes no sense to me, but I've been able to reproduce it 8 different times without fail. 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. It's really bizarre!! From: ??? [mailto:chen...@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: chen...@maxthon.net Maxthon® --?! ???! ??(??) http://www.maxthon.cn/ | www.maxthon.cn http://www.maxthon.cn/ ???! cfaust-dougot ??: 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!
RE: Apache Blank Pages
It's prefork 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 I've isolated the problem, you guys will say I'm crazy but I can reproduce the results over and over again. 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. That makes no sense to me, but I've been able to reproduce it 8 different times without fail. 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. It's really bizarre!! From: ??? [mailto:chen...@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: chen...@maxthon.net Maxthon® --?! ???! ??(??) http://www.maxthon.cn/ | www.maxthon.cn http://www.maxthon.cn/ ???! cfaust-dougot ??: 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!
Re: Apache Blank Pages
On Wed, Jan 13, 2010 at 7:28 AM, cfaust-dougot cfa...@doyougot.com wrote: 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. It's possible you are opening this handle during startup and trying to use it after the fork. That would result in the sort of failures you're seeing. - Perrin
RE: Apache Blank Pages
Do you mean on apache startup? I'm not calling DBI or DBD in startup.pl. Any other module would be after the fork, wouldn't? Thanks!! From: Perrin Harkins [mailto:phark...@gmail.com] Sent: Wed 1/13/2010 12:07 PM To: cfaust-dougot Cc: ???; modperl@perl.apache.org Subject: Re: Apache Blank Pages On Wed, Jan 13, 2010 at 7:28 AM, cfaust-dougot cfa...@doyougot.com wrote: 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. It's possible you are opening this handle during startup and trying to use it after the fork. That would result in the sort of failures you're seeing. - Perrin
Re: Apache Blank Pages
On Wed, Jan 13, 2010 at 5:31 PM, cfaust-dougot cfa...@doyougot.com wrote: Do you mean on apache startup? I'm not calling DBI or DBD in startup.pl. Any other module would be after the fork, wouldn't? Some modules (e.g. Class::DBI) will open a connection when you use them. If you're loading any modules at all in startup, there's a possibility that this could be the issue. - Perrin
RE: Apache Blank Pages
Ouch, that could get messy. Below is what I currently call in startup, by any chance does anything pop out at you? Other wise I'll start going though them one at a time. Thanks Perrin use ModPerl::MethodLookup; ModPerl::MethodLookup::preload_all_modules( ); use ModPerl::Util ( ); #for CORE::GLOBAL::exit use APR::Request (); use APR::Request::Apache2 (); use APR::Request::CGI (); use APR::Request::Cookie (); use APR::Request::Error (); use APR::Request::Hook (); use APR::Request::Param (); use APR::Request::Parser (); use APR::Table (); use Apache2::RequestRec; use Apache2::RequestIO; use Apache2::RequestUtil; use Apache2::Upload (); use Apache2::Request (); use Apache2::Cookie (); use Apache2::ServerUtil(); use Apache2::Connection(); use Apache2::Log(); use ModPerl::Registry(); use Apache2::Const -compile = ':common'; use Apache2::Const -compile = qw(OK); use Apache2::Const -compile = qw(REDIRECT); use MIME::Lite (); use MIME::Lite::HTML (); use HTML::Template (); use HTML::TagFilter (); use Data::Page (); use Data::Pageset (); use Image::Magick (); use Image::Magick::Thumbnail (); use Image::Magick::Thumbnail::Fixed (); From: Perrin Harkins [mailto:phark...@gmail.com] Sent: Wed 1/13/2010 5:36 PM To: cfaust-dougot Cc: modperl@perl.apache.org Subject: Re: Apache Blank Pages On Wed, Jan 13, 2010 at 5:31 PM, cfaust-dougot cfa...@doyougot.com wrote: Do you mean on apache startup? I'm not calling DBI or DBD in startup.pl. Any other module would be after the fork, wouldn't? Some modules (e.g. Class::DBI) will open a connection when you use them. If you're loading any modules at all in startup, there's a possibility that this could be the issue. - Perrin
Apache Blank Pages
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!
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 cfa...@doyougot.com 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!
RE: Apache Blank Pages
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. I've gotten a little further since my last post, but it still doesn't make sense. 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. 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). 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. Virtual Host 2 makes the connection within sub handler and that's the one that doesn't work. No closer to a solution though - any method I try to use to connect to the DB from VH2 results in this problem. Still doesn't make a lot of sense. From: William T [mailto:dietbud...@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 cfa...@doyougot.com 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!
