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

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Bug ID 102322
Summary System crashes after "[drm] IP block:gmc_v8_0 is hung!" / [drm] IP block:sdma_v3_0 is hung!
Product DRI
Version DRI git
Hardware x86-64 (AMD64)
OS Linux (All)
Status NEW
Severity critical
Priority medium
Component DRM/AMDgpu
Assignee dri-devel@lists.freedesktop.org
Reporter jb5sgc1n.nya@20mm.eu

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.


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