Topic: Apache 2.2.3 & mod_rewrite (win32 works, win64 does not)

[EElyn]

Hi,

I've been hunting an irritating bug for the past 3 hours and finally managed to boil the problem down to mod_rewrite on my x64 platform.

I've got a standard XP32 and a 2003x64 available on two separate machines, and performed out-of-the-box testing on v2.2.3 on both to narrow down the problem.

Turning on logging for mod_rewrite currently cause the win64 httpd child process to crash. This does not happen on the 32 platform, so I guess mod_rewrite hasn't been ported totally yet.

To reproduce, simply add the following lines to the bottom of the installer generated httpd.conf file:

LoadModule rewrite_module modules/mod_rewrite.so
RewriteEngine on
RewriteLog C:/rewrite.log
RewriteLogLevel 10

Could someone please verify this? My client fails with 0xC0000005, which could be caused by DEP or simply a memory corruption.. I haven't fiddled with it though..

My current dev environment cannot handle x64 code, so I’m searching for confirmation on the problem before starting to create one..

So.. I would greatly appreciate it if someone could try the above code on an out-of-the-box config of apache v2.2.3 on win64

[EElyn]

Pfew.. okay, after getting my remote x64 debugger up and running, I continued the hunt for the bug.. The solution is to apply an apparently missing flag to the libapr compilation.

Unless the flag APR_VOID_P_IS_QUAD is defined, the apr_vformatter (part of a snprintf equivalent function) will always fail when trying to parse a pointer request (%p).. If it fails, it cannot correctly increase the data-to-be-formatted pointer (va_arg(ap, void*)) with the correct bytes. If any other data is to be formatted after this failure, then the pointers to that data will most likely be wrong. This was the case with my mod_rewrite log bug

so.. To fix:
Apply the APR_VOID_P_IS_QUAD flag to the compilation of libapr.

Do this by adding '/D "APR_VOID_P_IS_QUAD"' to the Additional Options under Command Line part of libapr Property pages.

I've searched through the entire 2.2.3 sourcetree for additional APR_VOID_P_IS_QUAD's, but none was found.. so it is only possible to apply this flag through /D.

[PaRK_7677]

Thank you for the detective work EElyn. Unfortunately I'm not the one working on Apache x64 (I've done it but my accomplishments with it are far behind Jorge's)

Hopefully he will see this thread and can look into it Thanks for supporting the cause

[Jorge]

I have no experience with debugging C Code, I maged to submit a minor patch to the 2.2 source tree that is currently under revision of wrowe.

I passed along the error description to ASF aswel. Not sure if they'll fix this in a hurry.

x64 support isn't there top priority.