Thank you for this bug report. To properly diagnose the problem, we
need a backtrace to see what is happening behind the scenes. To
find out how to generate a backtrace, please read
http://bugs.php.net/bugs-generating-backtrace.php for *NIX and
http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32

Once you have generated a backtrace, please submit it to this bug
report and change the status back to "Open". Thank you for helping
us make PHP better.

Call Stack:

# ChildEBP RetAddr  Args to Child              
WARNING: Frame IP not in any known module. Following frames may be wrong.
00 0126ff84 77bbb3ca 021c2490 00000000 00000000 <Unloaded_php5ts.dll>+0x265c80
01 0126ffb8 7c826063 021837e8 00000000 00000000 msvcrt!endthread+0xab
02 0126ffec 00000000 77bbb35a 021837e8 00000000 kernel32!GetModuleFileNameA+0xeb

Debug:

(bdc.ff0): Access violation - code c0000005 (first chance)
eax=77bcca52 ebx=021e7a20 ecx=021e7a20 edx=01250087 esi=0160a520 edi=00000000
eip=01af5c80 esp=0124ff88 ebp=0124ffb8 iopl=0         nv up ei pl zr na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010246
<Unloaded_php5ts.dll>+0x265c80:

(bdc.ff0): Access violation - code c0000005 (!!! second chance !!!)
eax=77bcca52 ebx=021e7a20 ecx=021e7a20 edx=01250087 esi=0160a520 edi=00000000
eip=01af5c80 esp=0124ff88 ebp=0124ffb8 iopl=0         nv up ei pl zr na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010246
<Unloaded_php5ts.dll>+0x265c80:

I try to use php5ispai 5.1.4. Nothing changed.

What about debug symbols instead of "02 0126ffec 00000000 77bbb35a 021837e8 00000000" ?

I got the same thing for the call stack. I did try downloading the debug-pack and using those symbols files but never was able to get anything useful. I tried loading the symbols and using them several different (kd, windbg, IIS Diag) ways but never was able to get anything more than what's already been posted. If you have some instructions or ideas I'd be happy to try them. You can tell the Microsoft symbols are loading and resolving properly but I'm not sure about the PHP symbols? I've never tried to look up anything in an unloaded module before, since you've still got the offset I imagine it can be done.

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

I got the same result with debug symbols.

We are aware of PHP's problems with stability under IIS and are working 
to rectify the problem. Unfortunatly your bug report does not contain any
extra useful information and we already have enough bug reports open about
this issue. If you can provide more detailed information such as a 
reproducable crash or a backtrace please do so and reopen this bug. 
Otherwise please keep trying new releases as we are working to resolve 
the problems on this platform
 
Thanks for your interest in PHP.