[Bug testsuite/31312] attach-many-short-lived-threads gives inconsistent results

["cel at linux dot ibm.com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31312

--- Comment #13 from Carl E Love <cel at linux dot ibm.com> ---

I did reach out to the kernel community about this.  There are some timing
issues that can cause the kernel to legitimately return EPERM.  He pointed me
to the ptrace Linux man page.  Another possible cause for the EPERM is if
ptrace is already connected to the process.  I tried to determine if this was
in fact the case.  Specifically if the detach hadn't completed yet but was not
able to show that was the failure case.  

Basically, the kernel team didn't seem to think it the EPERM result was a
kernel bug.  That discussion really didn't go very far.

I will put together a patch to have Power 10 just exit the test on an EPERM
error and attach it to the bugzilla for review.

Thanks for the feedback.

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