Bug 113341

Summary:	GPU Lockup on AMD Kaveri
Product:	Drivers	Reporter:	Bernd Steinhauser (linux)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	RESOLVED UNREPRODUCIBLE
Severity:	normal
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	4.4.2	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	journal log from the time of the gpu lockup. glxinfo Xorg.0.log

Description Bernd Steinhauser 2016-02-27 20:18:57 UTC

Created attachment 206321 [details]
journal log from the time of the gpu lockup.

GPU is an AMD Kaveri: 1002:130f
Happened when I started an application (way before the application actually showen) on KDE Plasma 5.5.
The kernel version was 4.4.2 with an additional vblank fix applied (see [1]). 

Since I wasn't prepared for this and ssh wasn't activated and I couldn't save dmesg output. Instead I'll attach what I found in the journal.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=93746

Comment 1 Michel Dänzer 2016-02-29 01:25:44 UTC

Please attach the output of glxinfo and the Xorg log.

Comment 2 Bernd Steinhauser 2016-02-29 05:33:39 UTC

Created attachment 206381 [details]
glxinfo

Comment 3 Bernd Steinhauser 2016-02-29 05:37:40 UTC

I forgot about Xorg log, sorry. Since only one old one is kept, it's gone already.
Maybe logging to syslog/journal is a good idea ...

Comment 4 Bernd Steinhauser 2016-03-05 11:47:44 UTC

Today I ran into this again and got the Xorg log, but there doesn't seem to be anything interesting in it.
Kernel is now 4.4.4.

When the freeze occurs, I can still ssh into the system. Applications continue to run (i.e. I had a music player running), I could even reboot the system, although that seemed to take longer because X didn't like to shutdown (was markt as DSsl+ in ps aux).

Comment 5 Bernd Steinhauser 2016-03-05 11:48:09 UTC

Created attachment 207721 [details]
Xorg.0.log

Comment 6 Michel Dänzer 2016-03-07 09:27:24 UTC

Any chance you could try if this also happens with LLVM 3.8 or even current SVN/Git?

Does it always happen when starting a particular application?

Comment 7 Bernd Steinhauser 2016-03-07 14:11:48 UTC

I tried to build LLVM/clang scm, but it failed (have to check why and if I can get around that).

I've had several freezes over the last few weeks (most of them when I bisected that other bug mentioned above (so could be unrelated), but only a few after staying on 4.4.x), but this one was the only one I could relate to a specific event, starting an application (thunderbird here).
The other ones seemed to happen out of nowhere, so it could be that it was just coincidence that it happened when I started that application.

Comment 8 Michel Dänzer 2016-03-08 01:50:14 UTC

FWIW, right now it's better to try LLVM 3.8 than SVN/Git, because the latter will expose you to https://bugs.freedesktop.org/show_bug.cgi?id=94242 .

Comment 9 Bernd Steinhauser 2016-03-11 18:14:50 UTC

I will try to build llvm, but it could require me a few days since it's not yet provided by my distribution and I have to check the changes in the build system.

BTW, I can usually ssh into the system. Is there any way I could gather more debug info when this happens?

Comment 10 Bernd Steinhauser 2016-03-30 17:46:26 UTC

During the last 2 weeks I switched between amdgpu and radeon a couple of times.
What I noticed is that with radeon I do get lockups here and there, I think almost always (not 100% sure though) when a video is running.
Both with xv and vdpau as video output.
llvm is now 3.8.

On amdgpu I haven't seen a lockup yet, except for a view when bisecting 4.4-rc2 or -rc3, but I guess that was a different problem which got fixed until the release.

Comment 11 Bernd Steinhauser 2016-06-03 05:22:49 UTC

Since I'm now exclusively using amdgpu and since that works very well for me, I didn't do much more tests with radeon and thus cannot tell if this is still present or not.
Therefore closing the bug report.