[Bug nptl/19193] pthread_kill, pthread_cancel return ESRCH for a thread ID whose lifetime has not ended

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19193

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.35
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for 2.35 via:

commit 8af8456004edbab71f8903a60a3cae442cf6fe69
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Sep 13 11:06:08 2021 +0200

    nptl: pthread_kill, pthread_cancel should not fail after exit (bug 19193)

    This closes one remaining race condition related to bug 12889: if
    the thread already exited on the kernel side, returning ESRCH
    is not correct because that error is reserved for the thread IDs
    (pthread_t values) whose lifetime has ended.  In case of a
    kernel-side exit and a valid thread ID, no signal needs to be sent
    and cancellation does not have an effect, so just return 0.

    sysdeps/pthread/tst-kill4.c triggers undefined behavior and is
    removed with this commit.

    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

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