(In reply to Koichiro Iwao from comment #15)
> Hi, 
> 
> This causes segfault on bhvye hypervisor running on Ryzen processors. 
> 
> FreeBSD folks are also investigating the issue from hypervisor's side but I
> would like to let you know that this caused an issue because of the change
> to keep your eyes on this.
> 
> - https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279901
> - https://bugs.almalinux.org/view.php?id=489
> - https://bbs.archlinux.org/viewtopic.php?id=295802

This is now bug 32470.

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https://bugs.launchpad.net/bugs/2030515

Title:
  Terrible memcpy performance on Zen 3 when using rep movsb

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