#21756 [Fbk->Opn]: Accessing $_SERVER['PATH_INFO '] causes intermittent segfault in Apache

ID: 21756 User updated by: php@lost.co.nz Reported By: php@lost.co.nz -Status: Feedback +Status: Open Bug Type: Reproducible crash Operating System: Linux/Apache (Debian 3.0r1) PHP Version: 4.3.0 New Comment: Yes, you're right, the include() statement in my toy example should have been wrapped in a pair of braces - the actual code does not contain calls to include() however... I'm sorry I could not provide a backtrace - the thing refused to misbehave when gdb was listening. Prehaps someone who is more familiar with the Apache (1.3) / PHP interface will know where to examine more closely. Previous Comments: ------------------------------------------------------------------------ [2003-01-20 00:04:35] sniper@php.net Sounds pretty unlikely for the crash being caused by unset variable/array index. And btw. If you conditionally include() files, then you MUST use { } with the clauses: http://www.php.net/manual/en/function.include.php (Example 12-6) Maybe this caused the crashes? ------------------------------------------------------------------------ [2003-01-19 14:34:35] php@lost.co.nz If the special global $_SERVER['PATH_INFO'] is accessed in scripts on either my test or production server when it is not set (on load of home page usually) it causes Apache to segfault intermittently (like 1/100 page views...). eg, this is what caused me grief: if( $_SERVER['PATH_INFO'] == 'whatever') include( 'whatever_else'); Wrapping in call to 'isset' stopped crashes: if( isset($_SERVER['PATH_INFO']) ) if( $_SERVER['PATH_INFO'] == 'whatever') include( 'whatever_else'); Was really hard to reproduce. In the end I sat at a split screen comparing the error to the access log, second by second. The error log was reporting ~100-300 segfaults a day untill I used the call to isset, when that dropped to zero. (After a fun 6 hours trying to catch it with gdb...) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=21756&edit=1