https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230144
Bug ID: 230144
Summary: Linux emulator does not work on Ryzen / Epic
processors
Product: Base System
Version: 11.2-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: p...@twisted.org.uk
Trying to run any Linux binary on Ryzen or Epic coredumps. I trying to
backtrace the core but the debugger does not seem to be able to get any
information ut of the binary.
This is completely AMD Zen specific - I can take the same disc and boot it up
with a Xeon processor and it works fine. I have also used the Linux emulator on
older AMD processors fine (my desktop was a Phenom II until I upgraded it to
the Ryzen) but I have to admit I haven't been able to try the latest kernel on
older AMD processors.
Reproducing is trivial - enable Linux in rc.conf, install linux_base-c7 and try
and run /compat/linux/bin/bash. It will immediately coredump on a Zen machine,
but plugging the same disc into an Intel machine will run it fine.
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