Description:
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Step to produce error

1. Install PHP 5.2.1.1 in c:\PHP
2. Add environment variable Path c:\php and PHPRC c:\php
3. Install IIS and configure as per documentation.
4. Configure IIS and as documented
5. Assign Internet Guest Account (IUSR) user read & execute permissions to c:\php
6. Create folder c:\php\log
7. Create file php-error.log in "log" folder
8. Modify php ini set log_error = 0 and error_log = "c:\php\log\errors.log"
9. Assign permission Modify permission to IUSR user on c:\php\log folder
10. Restart IIS
11. create folder c:\website.
12. Create virtual directory named "test" under default website and point it to c:\website.
13. Create a file with extention .php and put some lines in it

access your website using http://localhost/test 

You will see the php will generate Invalid access to memory location error

1. Remove modify permission for IUSR and leave write permission
2. make some syntax error in php file created in step 13.
3. execute the script the error will log successfully

I hope this bug will be fixed

thanks