It seems to be confirmed as a hardware problem. See:
I have entered in contact with AMD and am doing an RMA of my CPU in the
next days. From what I could grasp the bug is usual in the first batches
of Ryzen, so there might be many affected CPUs in the wild. AMD is not
issuing a recall, it will treat with it in a case by case basis.
Anyone can check if their CPU has the problem by running the kill-
ryzen.sh script described in the original bug report. If your CPU has
the problem contact AMD technical support using the link in the Phoronix
article linked above.
Maybe I should mark this bug as invalid? At least the bug report will
remain here so that other affected Ubuntu users may find out how to
** Tags added: kernel-bug-exists-upstream
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Long, multi-threaded compilations, segfault in Ryzen
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