glibc 2.35 i686 failures in tst-memset-rtm (bug 28033)

[Florian Weimer]

* Carlos O'Donell via Libc-alpha:

> On Fedora 35, at commit eb024343726ee3b2e644b72ae03df9023898cf01, I see
> the following somewhat random failures:
>
> [carlos@fedora ~]$ cat ~/build/glibc-review-i686/string/tst-memset-rtm.out
> error: ../sysdeps/x86/tst-string-rtm.h:63: TSX abort rate: 100.00% (3000 out of 3000)
> error: 1 test failures
> [carlos@fedora ~]$ cat ~/build/glibc-review-i686/string/tst-memset-rtm.test-result 
> FAIL: string/tst-memset-rtm
> original exit status 1
> [carlos@fedora ~]$ 
>
> Is this the same root cause as this issue?
> https://sourceware.org/pipermail/libc-alpha/2022-January/135323.html

Please see <https://sourceware.org/bugzilla/show_bug.cgi?id=27398#c3>
and check if you can reproduce this phenomenon.

This is a kernel/firmware bug.  RTM is not correctly disabled after
resume.

Thanks,
Florian