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Re: MapViewOfFileEx errors with cygwin-1.5.10-3 and gnome apps


On Thu, Jun 03, 2004 at 09:18:03AM -0400, Igor Pechtchanski wrote:
>On Thu, 3 Jun 2004, Dr. Volker Zell wrote:
>
>> >>>>> Igor Pechtchanski writes:
>>
>> > In my (outdated!) cvs checkout of winsup/cygwin, the error message you got
>> > appears in shm.cc (fixup_shms_after_fork) and shared.cc (open_shared).
>> > The first thing to find out is which one of them produced your message
>> > (the output of strace should help).  The strace output should also contain
>> > handle values, so you can try to trace it backwards from the error...
>>
>> > BTW, before you spend a lot of effort on debugging, here's a WAG: do you
>> > use cygserver?  If so, did you reboot and/or restart cygserver after you
>> > upgraded?  The above looks like a shared memory error, and shared memory
>> > is part of cygserver functionality...  I know you said that you don't have
>> > multiple Cygwin DLLs in your path, but if you renamed your old cygwin1.dll
>> > before replacing it with the snapshot one, it may be possible that you
>> > have multiple copies of cygwin1.dll *in memory*.  Same goes for other
>> > services, FWIW.
>>
>> First of all, yes I'm using cygserver.
>>
>> I have uploaded an strace run of a gnome game (gnibbles) which shows the
>> symptom when pressing Help->Manual. The problem always occurs when a
>> gnome program starts another program like in this case gnome-help-browser.
>> There is also the corresponding cygserver debug output with comments
>> from me inline starting with ******
>>
>> I do not find any fixup_shms_after_fork call in the strace, but there is
>> an open_shared call right in the beginning. I'm not sure it's the culprit
>>
>> http://cygwin.dev.wapme.net/packages/vzell/test/cygserver.debug.output.bz2 (1.8 kb)
>> http://cygwin.dev.wapme.net/packages/vzell/test/strace.gnibbles.bz2 (141 kb)
>>
>> Maybe somebody can take a look.
>
>The one thing I see immediately in your strace output:
>
>    2:Program name: D:\opt\gnome1\bin\gnibbles.exe (1172)
>    3:App version:  1005.9, api: 0.112
>                    ^^^^^^^^^^^^^^^^^^
>    4:DLL version:  1005.10, api: 0.116
>...
>  403:Program name: D:\opt\gnome1\bin\gnibbles.exe (512)
>  404:App version:  1005.10, api: 0.116
>  405:DLL version:  1005.10, api: 0.116
>...
>15764:Program name: D:\opt\gnome1\bin\gnibbles.exe (1828)
>15765:App version:  1005.10, api: 0.116
>15766:DLL version:  1005.10, api: 0.116
>
>So it looks like you *do* have two versions of cygwin1.dll in memory...

"App version" means the version of cygwin that the application was built
under.  As long as it's <= the "DLL version" that's ok.

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