[Bug 41838] Kernel Crash/Hanging system in connection between WebKit and Gnome-Shell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41838

--- Comment #29 from Alex Deucher <agd5f at yahoo.com> 2011-11-07 08:35:45 PST ---
(In reply to comment #28)
> Fine! I will apply your patch today evening and will report the result as soon
> as possible. Can you tell me shortly what the HDP cache is? For what is it
> good? Thanks!
> 

Host Data Path.  It's the interface for accessing vram via the CPU.  E.g., when
you access a buffer in vram via the PCI FB BAR, it goes through the HDP on the
GPU.  Unfortunately, bugzilla.kernel.org is down so I don't remember exactly
what bug the r600_ioctl_wait_idle patch fixed.  It's possible you just aren't
hitting the case in your particular desktop scenario, but that removing it
would regress other cases.  I'm leery of applying it until I have some
confirmation that someone else is hitting this bug or that it doesn't regress
any other cases.

> 
> I tried to compile mesa from git, but didn't succeed and gave up in shame! In

What sort of problems are you seeing?

> general I think code from user-space shouldn't able to trigger (or prevent, in
> this case) a fatal crash or hang in kernel-space. So I decided to investigate
> the problem by testing the different versions of the kernel and some poking in
> the code ;-)

That's the nature of complex 3D engines.

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