[Bug 200493] Killing pid 11 (idle) wedges the disk IO
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Fri May 29 09:55:02 UTC 2015
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200493
--- Comment #5 from Konstantin Belousov <kib at 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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