[amd-gfx] AMD Carrizo - GPU fault detected: 146 0x0842b714

[Mads]

> On 2016-06-20 11:09, Nicolai Hähnle wrote:
> 
>> Thanks for the effort. The apitrace of Dolphin is indeed "useless" -- 
>> seems like OpenGL is loaded, but in the end the app decides not to use 
>> it. Instead, it looks like the VM faults are coming from the X server.
>> 
>> Can you make sure that the X server loads the debug build of 
>> radeonsi_dri.so with assertions enabled?
>> 
>> I wonder if it's possible to get an apitrace from the X server. 
>> Perhaps you can reproduce the problem with Xephyr? If that also shows 
>> the VM faults, it would probably be easiest.
>> 
>> Nicolai
> 
> Just so you know, the system is running xorg-server 1.18.3 and 
> xf86-video-amdgpu-1.1.0 with DRI3 + xf86-input-libinput-0.19.0.
> 
> I'm rebuilding LLVM and mesa now with debug enabled just to make sure 
> my environment is sane (LLVM didn't have debug/assertions enabled), but 
> that'll take a while... be right back with Xephyr testing when that's 
> done.
> 

Trip report:

1) If I start Xephyr like this: "DISPLAY=:0 Xephyr -auth .Xauthority :1 
-screen 800x600", there's alot of corruption on the whole screen (and 
the Xephyr window does not show), but the corruptions looks slightly 
different than usual (lots of black bars in a checkers like formation). 
Also, the VM_CONTEXT1_PROTECTION_FAULT_ADDR-error does not trigger! 
Tried with DRI2 and DRI3, same results (and type of corruption) with 
both.

2) If I start Xephyr like this: "DISPLAY=:0 Xephyr -auth .Xauthority :1 
-ac -screen 800x600 -glamor" (with glamor that is), the Xephyr window 
works (but the KDE window decorations around/belonging to the Xephyr 
window looks corrupted). Both with DRI2 and DRI3, window decoration 
corruption with both. No triggering of protection faults here either.

If I then, after starting Xephyr with -glamor, start dolphin like this: 
"$ DISPLAY=:1 LIBGL_DEBUG=verbose dolphin" I get this log:

> libGL: OpenDriver: trying /usr/lib64/dri/tls/swrast_dri.so
> libGL: OpenDriver: trying /usr/lib64/dri/swrast_dri.so
> Trying to convert empty KLocalizedString to QString.
> Cannot creat accessible child interface for object:  
> PlacesView(0x959f50)  index:  5
> QPixmap::scaled: Pixmap is a null pixmap
> QPixmap::scaled: Pixmap is a null pixmap
> (... etc ...)

And the dolphin window works inside Xephyr without any corruption, and 
no messages in dmesg.

And just to double-check, starting dolphin on :0 yields, yet again, a 
terrible mess on screen, and VM faults in dmesg - same as before.

assertions are enabled on mesa and llvm, but I haven't disabled -O2 and 
stripping of debug info yet.. should I do that next, so it'll be easier 
to run through gdb?

(I have no qualms of giving you shell access of this machine if you want 
to have a look around...)

- Mads