[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 #20 from Carl E Love <cel at linux dot ibm.com> ---
I tried the prototype patch from Thiago.  It seems to fix the hangs on detach. 
I ran the many-short-lived threads test 500 times.  I did have three runs that
encountered a new error I haven't seen before.  

FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 6: break at
break_fn: 1
FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 6: break at
break_fn: 2 (the program is no longer running)
FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 6: break at
break_fn: 3 (the program is no longer running)
FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 6: reset timer in
the inferior
FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 6: detach (the
program is no longer running)

It seems the workload had finished before the expect script finished running. 
So we may want to address that as a separate patch later. 

Thiago's fix seems to work well on Power 10.

I did work on the strace as suggested.  I was trying to get strace to attach to
the gdb thread from the expect script.  Haven't got the script to get the
correct gdb PID yet.  I think I was trying to attach to the expect script which
strace fails to attach to.  I tried writing a script that I could run after the
workload started that would call ps and try to grep out the gdb process id and
attach to it but again I haven't got that working yet either.  

I will try and work on the strace thing some more but not sure if it is really
needed at this point given that Thiago seems to have figured out the issues.

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