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

[Stephen Woodbridge]

Some ideas, but no real clue because i have not looked at this code in a 
while.

It looks like it is getting a segv while freeing/cleanup the FontCache, 
so my questions would be:

1. has the FontCache REALLY been initialized?
2. Has it already be freed?
3. valgrind on linux might show some issue.

Not sure this will help, but it is how I would start to discern what 
might be the problem. Of course, asking the actual dev's is also a 
potential ;)

-Steve W

On 10/19/2014 3:14 PM, Jeff McKenna wrote:
> 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
>
>
>
>
>
>
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