[Bug 102322] System crashes after "[drm] IP block:gmc_v8_0 is hung!" / [drm] IP block:sdma_v3_0 is hung!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102322

--- Comment #10 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
(In reply to Andrey Grodzovsky from comment #8)
> The kernel and MESA seems new enough, LLVM is 6 so maybe you should try 7.

LLVM 7 has not been released, and replacing LLVM 6 with the current subversion
head of LLVM 7 means to basically recompile and reinstall half of the operating
system (starting at radeonsi, then Xorg, then its dependencies...)

I'm fine with using experimental new kernels to find a more stable amdgpu
driver - but if a kernel driver crashes just because some user-space
application (X11) utilizes a wrong compiler version at run time, then some part
of the driver design is very wrong. 

> The firmware also looks pretty late but I still would advise to manually
> override all firmware files with files from here
> https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/
> tree/amdgpu

I did a "diff -r" on the git files with the ones installed by Arch, they are
all binary identical.

> > Jun 26 00:50:25 ryzen kernel: [drm:drm_atomic_helper_wait_for_dependencies
> > [drm_kms_helper]] *ERROR* [PLANE:40:plane-4] flip_done timed out
> 
> It's a know issue, try the patch I attached to resolve the deadlock , but
> you will probably experience other failures after that anyway. 

Ok, thanks for the patch, will try this next time I compile a new kernel.

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