bin/164526: kill(1) can not kill process despite on -KILL
jilles at stack.nl
Sat Jan 28 18:30:14 UTC 2012
The following reply was made to PR bin/164526; it has been noted by GNATS.
From: Jilles Tjoelker <jilles at stack.nl>
To: bug-followup at FreeBSD.org, kes-kes at yandex.ru
Subject: Re: bin/164526: kill(1) can not kill process despite on -KILL
Date: Sat, 28 Jan 2012 19:24:07 +0100
> [stuck process cannot be killed, system hangs when reboot is
A signal cannot forcibly kill a process that is stuck in the kernel.
Allowing this would put the integrity of the kernel data structures at
risk and likely cause hangs, data corruption or panics later on.
If a process is stuck in the kernel for a long time, this can be things
like broken hardware, a non-responsive NFS server or a bug.
A state 'T' (stopped) probably means the process is multi-threaded and
is trying to suspend but one or more threads will not cooperate
(non-interruptible sleep or running in the kernel).
Useful commands to obtain more information (supposing pid is 45471):
procstat -k 45471
Of course, this does not help if you already rebooted.
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