Bug #18271 Updated: Page load hangs in apparently normal circumstances

ID: 18271 Updated by: Brendan@callaghans.com.au Reported By: Brendan@callaghans.com.au Status: Feedback Bug Type: IIS related Operating System: Win2000 Server PHP Version: 4.2.0 New Comment: I have been examining various log files, and have identified the following: When this event occurs, the Windows Event Viewer records an error from the W3CSVC service, stating that the request was not fulfilled within the allowed timeout, and so the request was deleted. The IIS error logs record the request as having failed with a 502 HTTP code. A 502 is defined as "Bad Gateway", so not very helpful. I tried switching on the config directive "display_startup_errors", but this had no effect. The data being sent in the POST are one small integer (three digits max) and one four-character string. And the hang is only triggered for very particular combinations of the two variables. What has got me tearing my hair out is that the script is failing before it has a chance to even try operating on the data. So how could the contents of the data be making a reproducible difference? How could "169" and "2002" work perfectly, but "170" and "2002" cause the script to hang? It just doesn't follow. Previous Comments: ------------------------------------------------------------------------ [2002-07-10 22:57:23] Brendan@callaghans.com.au Haven't been able to try that - the site is intranet only, with a standardised operating environment on the workstations. There's no other browser installed and I'd have to get permission from the SA to install one. But I'll have a chat to him and see if I can arrange a test. ------------------------------------------------------------------------ [2002-07-10 22:51:01] sniper@php.net Does this happen with other browsers? Like NS or Mozilla? ------------------------------------------------------------------------ [2002-07-10 22:41:51] Brendan@callaghans.com.au Platform information: Windows 2000 Server IIS 5 MSSQL 2000 Hi, For some time now, my PHP site has been experiencing an intermittent problem - very elusive. Every now and then, a user would try to do something and the next page simply would not load. All my users are accessing the site with IE6, and when the hang occurs, the status bar displays the text "Opening page ****...", and the blue status indicator crawls slowly to the right. But nothing happens. The screen doesn't even clear from the previous page. No errors, no warnings. I even tried turning on E_NOTICE, but none of those either. This continues for a couple of minutes, until IIS gives up and reports a CGI Timeout. Typically, if the user closed all his IE windows, and then went back in, things would work normally again. So I assumed it had something to do with accumulating too much session data (hence, destroying the session by closing all the IE processes cleared things up). And since it was not reproducible, I couldn't do very much about it. However, just recently we discovered a series of actions which reproduces the problem, regardless of how "fresh" the session is. The page in question is quite simple compared to some of the other pages in the site, which is why I find it curious that it should trigger the bug consistently. When you first load the page, it presents a HTML form, asking the user for some data. When the form is submitted (it submits back to the same php file), the page generates a fairly basic report. The bizarre part is that with certain data inputs, the report runs fine (and total execution time is about a third of a second), and with certain other data inputs, the report will not load at all. This page doesn't put any data in the session, the code doesn't use any particularly exciting functions, and I can't discern any relevant difference between the data input which works, and the data input which triggers the hang. I can't debug it using PHP code, because it doesn't even reach the stage of outputting HTML. I am very confused and looking for a hint as to how I can proceed. I searched the bug database, but didn't find any matches to my problem. The bug is causing some serious angst in my user base. Any assistance will be greatly appreciated. BJ ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=18271&edit=1