[Bug 2065141] [NEW] AMD CPU type 0x70f40 (ext family 0xa) unknown

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Marco Trevisan (Treviño) (3v1n0):

[ Impact ]

Running rr in Phonenix AMD APU (Ryzen 7840U) as in latest generation of
AMD ThinkPad fails with

[FATAL ./src/PerfCounters_x86.h:121:compute_cpu_microarch()] AMD CPU
type 0x70f40 (ext family 0xa) unknown

It was fixed upstream via https://github.com/rr-debugger/rr/pull/3645
(related issue https://github.com/rr-debugger/rr/issues/3715)

[ Test case ]

With a such CPU run:
 rr record true

It should record the process execution as expected, in case it may
mention that some further tuning is required for Zen CPUs:

  On Zen CPUs, rr will not work reliably unless you disable the hardware 
  SpecLockMap optimization.
  For instructions on how to do this, see
  https://github.com/rr-debugger/rr/wiki/Zen

[ Regression Potential ]

Not really known since it's just adding a case for the CPU family.

In theory it may make other CPUs of the same family not work in the same
way.

** Affects: rr (Ubuntu)
     Importance: Medium
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: In Progress

** Affects: rr (Ubuntu Jammy)
     Importance: Medium
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: In Progress

** Affects: rr (Ubuntu Mantic)
     Importance: Medium
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: In Progress

** Affects: rr (Ubuntu Noble)
     Importance: Medium
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: In Progress


** Tags: patch
-- 
AMD CPU type 0x70f40 (ext family 0xa) unknown
https://bugs.launchpad.net/bugs/2065141
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