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Subject: [Bug 200493] Killing pid 11 (idle) wedges the disk IO
Date: Fri, 29 May 2015 09:55:03 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200493

--- Comment #5 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Edward Tomasz Napierala from comment #4)
Great, you nailed it down.

Look at the tdsigwakeup(), which is called from the main code to send a signal
to a thread tdsendsignal():

    /*
     * Bring the priority of a thread up if we want it to get
     * killed in this lifetime.
     */
    if (action == SIG_DFL && (prop & SA_KILL) && td->td_priority > PUSER)
        sched_prio(td, PUSER);

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