[ros-bugs] [Bug 821] vlc crash ros

[ReactOS.Bugzilla at reactos.org]

http://www.reactos.org/bugzilla/show_bug.cgi?id=821





------- Additional Comments From alex.ionescu at reactos.com  2005-10-01 10:37 CET -------
I did some more debugging.

I *do* see the mutex in an KeInitializeMutant call from user-mode, so the
address is (was) at some point valid (so the list entry reading is fine).

However, I do -not- see KeReleaseMutant called (normal: process is dying so
we're cleaning up, so ExpDeleteMutant should be called by Ob). I also do -not-
see ExpDeleteMutant being called, which is NOT normal, since it's being called
for almost every other single mutant that was created by VLC & friends. I traced
this all the way up to ObpDeleteObject, and I never see the address being
printed out.

This would imply either:
1) We're skipping it
2) We're freeing it from somewhere else, bypassing Ob

Since we end up getting 0xCCCCCD0 at that address, that would skip option #1 and
imply that we are doing a manual ExFreePool on the mutant. I'm at a loss as to
why this would be happening, since this Mutant seems to be normally created
along with hundreds of others within 1-5 seconds. This Mutant is from user mode
(as far as I could see, it had a matching NtCreateMutant, like the others), so I
really don't understand how it coudl be manually fred from the pool. But it's
5AM so I might've really screwed up my debugging.

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