[Bug 263825] Possibly an interesting bug in umtx code

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 06 May 2022 19:24:22 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263825

            Bug ID: 263825
           Summary: Possibly an interesting bug in umtx code
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: dchagin@FreeBSD.org

While testing arm64 Linuxulator's signal trampoline code I found glibc test
which fails on native FreeBSD arm64 (sporadically hangs), but pass on amd64.
Seems to me a some CAS problem.
Unfortunately,  I'm not familiar with arm architecture.

Test, adopted to the FreeBSD here:

https://people.freebsd.org/~dchagin/tst-cond25.c

Btw, I tested it under qemu on mac os m1, maybe problem is here?

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