AW: [ros-kernel] crash within MmOpenMemoryAreaByAddress

[Hartmut B. <har...@te...>]

> -----Ursprungliche Nachricht-----
> Von:	we...@cw... [SMTP:we...@cw...]
> Gesendet am:	Montag, 13. Mai 2002 15:43
> An:	rea...@li...
> Betreff:	Re: [ros-kernel] crash within MmOpenMemoryAreaByAddress
>
> I think it would be preferable to commit without known bugs. Why not post 
the
> code to the list or commit to a seperate branch of the repository so more
> people can help with debugging without having to break existing 
functionality.

Hi,

for testing, I've attached two patches. The first (fastmutex.patch) changes 
the lock for the address space from a MUTEX to a FAST_MUTEX and calls 
KeBugCheck, if there is a recursive locking for the same thread. After the 
command 'gcc -o rdel.o rdel.c -o -pipe' occurs the recursive locking of a 
address space. The call to KeBugCheck is only for printing a stack trace. 
Without the call, there is a dead lock at this point. The second patch 
(mdl-fix.patch) does add a KeRaiseIrql/KeLowerIrql for MmMapLockedPages/  
MmUnmapLockedPages. With this patch, gcc works. There exist more points 
with a locked address space, which can also result in a corrupt memory area 
list, if there is a thread switching and a next access to the address 
space.

- Hartmut