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

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

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

--- Comment #18 from Tom Tromey <tromey at sourceware dot org> ---
> The gdb log says that it detached from the pid.  I don't find any way to verify that.  I don't see any gdb attached thread status command that would verify it.  

Yeah, what I would suggest is maybe modifying the test case to
invoke 'strace gdb ..' with some options to log the strace output
to a file; then examine the file to see if gdb correctly detaches
from all the threads it attached to.

That is, I'm wondering if there's some underlying bug that we haven't
properly recognized -- this would account for the weirdness where
one failed attach leaves gdb unable to attach in the future.  Thiago's
experiments here seem to indicate this could be the case.

If we are really convinced there is a kernel bug then I think re-trying
the test is not so important.  On the first failure it can just bail out.

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