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Subject: [Bug nptl/12889] Race condition in pthread_kill
Date: Mon, 13 Sep 2021 10:41:32 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D12889

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The master branch has been updated by Florian Weimer <fw@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dglibc.git;h=3D8af8456004edbab71f8=
903a60a3cae442cf6fe69

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 1919=
3)

    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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