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

Submitted by dwagner

Assigned to Default DRI bug account

Link to original bug (#102322)

Description

I consistently experience complete system crashes when browsing web pages using firefox for about 30 minutes, with the following dmesg output from the amdgpu driver:

[ 2330.720711] [drm:amdgpu_job_timedout [amdgpu]] ERROR ring sdma0 timeout, last signaled seq=40778, last emitted seq=40780
[ 2330.720768] [drm:amdgpu_job_timedout [amdgpu]] ERROR ring sdma1 timeout, last signaled seq=31305, last emitted seq=31306
[ 2330.720771] [drm] IP block:gmc_v8_0 is hung!
[ 2330.720774] [drm] IP block:gmc_v8_0 is hung!
[ 2330.720775] [drm] IP block:sdma_v3_0 is hung!
[ 2330.720778] [drm] IP block:sdma_v3_0 is hung!

(Above cited messages are the last to make it to a network-filesystem by running "dmesg -w" before the system stops to do anything.)

I am running a kernel compiled from https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next as of "commit 94097b0f7f1bfa54b3b1f8b0d74bbd271a0564e4" (so the very latest as of today).
My GPU is an RX 460.

Notice that this bug may be the same symptom as reported in https://bugs.freedesktop.org/show_bug.cgi?id=98874

However, the system crashes for me occur usually while vertically scrolling through some (ordinary) web page.