On 4/14/20 12:22 PM, Steffen wrote:
>
>
> This is the post above of backtrace
Thanks.
>
> By accident I've seen that Perl comes with GDB. This might help as well.
> I called httpd.exe from GDB with "-X -e debug" and then called a Perl URL in
> the browser.
>
> Excerpt below:
>
Somehow the below wasn't visible in the original mail.
> Thread 100 received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 4936.0x23e0]
> 0x00007ffbe57515d9 in libhttpd!ap_get_server_built () from
> X:\Apps\Apache24\bin\libhttpd.dll
> (gdb) bt
> #0 0x00007ffbe57515d9 in libhttpd!ap_get_server_built () from
> X:\Apps\Apache24\bin\libhttpd.dll
> #1 0x00007ffbe44d14aa in ?? () from X:\Apps\Apache24\modules\mod_cgi.so
> #2 0x00007ffbe575ee85 in libhttpd!ap_run_handler () from
> X:\Apps\Apache24\bin\libhttpd.dll
> #3 0x00007ffbe575da7f in libhttpd!ap_invoke_handler () from
> X:\Apps\Apache24\bin\libhttpd.dll
> #4 0x00007ffbe575a62a in libhttpd!ap_internal_redirect_handler () from
> X:\Apps\Apache24\bin\libhttpd.dll
> #5 0x00007ffbe575a6af in libhttpd!ap_process_request () from
> X:\Apps\Apache24\bin\libhttpd.dll
> #6 0x00007ffbe22888ef in ?? () from X:\Apps\Apache24\modules\mod_http2.so
> #7 0x00007ffbe5761545 in libhttpd!ap_run_process_connection () from
> X:\Apps\Apache24\bin\libhttpd.dll
> #8 0x00007ffbe22885ba in ?? () from X:\Apps\Apache24\modules\mod_http2.so
> #9 0x00007ffbe228c36e in ?? () from X:\Apps\Apache24\modules\mod_http2.so
> #10 0x00007ffbe9e30e72 in ucrtbase!_beginthreadex () from
> C:\Windows\System32\ucrtbase.dll
> #11 0x00007ffbea107bd4 in KERNEL32!BaseThreadInitThunk () from
> C:\Windows\System32\kernel32.dll
> #12 0x00007ffbebecced1 in ntdll!RtlUserThreadStart () from
> C:\Windows\SYSTEM32\ntdll.dll
> #13 0x0000000000000000 in ?? ()
> Backtrace stopped: previous frame inner to this frame (corrupt stack?)
> (gdb)
>
Unfortunately this stacktrace does not help. One reason might be that the
debugging symbols are missing.
It is very strange that it segfaults in ap_get_server_built, a simple function
just returning a pointer
to a static string constant. Furthermore ap_get_server_built is not called by
mod_cgi.
Can the crash be repeated against a binary with debugging symbols that are then
used to generate the stacktrace?
As I am not a Windows guy, I unfortunately cannot provide any instructions how
to do this.
Regards
Rüdiger
