[mapserver-dev] Crash on Windows: fontcache.c

[Jeff McKenna]

Hi devs,

With git/master on Windows, I trigger a crash of 
mapserv.exe/mapserver.dll any time I call mapserv.exe in CGI mode.  (no 
issue with MapServer 6.4.1)

- The good news is that I can reproduce this at the commandline with 
'mapserv -nh'.

   C:\ms4w> mapserv -nh

     This script can only be used to decode form results and
     should be initiated as a CGI process via a httpd server.
     For other options please try using the --help switch.

     (then a crash occurs, with this info below)

       ***
       Problem signature:
         Problem Event Name:	APPCRASH
         Application Name:	mapserv.exe
         Application Version:	0.0.0.0
         Application Timestamp:	54440643
         Fault Module Name:	mapserver.dll
         Fault Module Version:	0.0.0.0
         Fault Module Timestamp:	54440640
         Exception Code:	c0000005
         Exception Offset:	00274c8b
         OS Version:	6.0.6002.2.2.0.768.2
      ***

- I compiled mapserv in Debug mode (Visual Studio 2008)

- in the Visual Studio 2008 debugger this message appears:

          message: Unhandled exception at 0x10274c8b (mapserver.dll) in
          mapserv.exe:
          0xC0000005: Access violation reading location 0xdddddddd.

- the debugger stops at:

          fontcache.c

               line 92: FT_Done_FreeType(c->library);

- the call stack at that point is:

         ***
         mapserver.dll!_FT_Done_Library()  + 0x7b bytes	
  	mapserver.dll!_FT_Done_FreeType()  + 0x11 bytes	
	mapserver.dll!msFreeFontCache(ft_cache * c=0x104bf560)  Line 92 + 0xb 
bytes	
  	mapserver.dll!msFontCacheCleanup()  Line 164 + 0x9 bytes	
  	mapserver.dll!msCleanup(int signal=1)  Line 1967	
  	mapserv.exe!msCleanupOnExit()  Line 74 + 0x7 bytes	
  	msvcr90d.dll!doexit(int code=0, int quick=0, int retcaller=0)  Line 591	C
  	msvcr90d.dll!exit(int code=0)  Line 412 + 0xd bytes	
  	mapserv.exe!main(int argc=2, char * * argv=0x0453da10)  Line 315 + 
0xa bytes	
  	mapserv.exe!__tmainCRTStartup()  Line 586 + 0x19 bytes	
  	mapserv.exe!mainCRTStartup()  Line 403	
  	kernel32.dll!75f3d3c9() 	
  	[Frames below may be incorrect and/or missing, no symbols loaded 
for kernel32.dll]	
  	ntdll.dll!77871603() 	
  	ntdll.dll!778715d6() 	
  	libeay32.dll!cms_SignedData_init_bio(CMS_ContentInfo_st * cms=)  Line 
817 + 0xe bytes
         ***

I'm wondering if anyone has any ideas of what I can try, or if you need 
more information.  I am pretty stuck.  Thanks everyone,

-jeff