kern/164705: inability to terminate process in D state

[Коньков Евгений]

The following reply was made to PR kern/164705; it has been noted by GNATS.

From: =?windows-1251?B?yu7t/Oru4iDF4uPl7ejp?= <kes-kes at yandex.ru>
To: "Eugene M. Zheganin" <eugene at zhegan.in>
Cc: freebsd-gnats-submit at FreeBSD.org
Subject: Re: kern/164705: inability to terminate process in D state
Date: Thu, 2 Feb 2012 11:02:38 +0200

 Çäðàâñòâóéòå, Eugene.
 
 Âû ïèñàëè 2 ôåâðàëÿ 2012 ã., 10:17:46:
 
 
 >>Number:         164705
 >>Category:       kern
 >>Synopsis:       inability to terminate process in D state
 >>Confidential:   no
 >>Severity:       critical
 >>Priority:       low
 >>Responsible:    freebsd-bugs
 >>State:          open
 >>Quarter:        
 >>Keywords:       
 >>Date-Required:
 >>Class:          sw-bug
 >>Submitter-Id:   current-users
 >>Arrival-Date:   Thu Feb 02 08:20:11 UTC 2012
 >>Closed-Date:
 >>Last-Modified:
 >>Originator:     Eugene M. Zheganin
 >>Release:        8.2-STABLE
 >>Organization:
 EMZ> RealService LLC
 >>Environment:
 EMZ> FreeBSD bsdrookie.norma.com. 8.2-STABLE FreeBSD 8.2-STABLE #0:
 EMZ> Mon Jul 25 14:13:03 YEKST 2011    
 EMZ> emz@:/usr/obj/usr/src/sys/GENERIC  amd64
 >>Description:
 EMZ> There's only two holy grails in FreeBSD: one, nowadays patched
 EMZ> but sometimes still haunting FreeBSD, is the panic (livelock,
 EMZ> hangup, name it yourself) when the mounted media is physically
 EMZ> removed (a diskette, a flash-disk etc).
 
 EMZ> And the second - this is inability to terminate a process when
 EMZ> it hangs in D state. Of course, kill -9 didn't work (as always.
 EMZ> I'm guessing thi isn't a 'uncatchable uniterruptable signal' as
 EMZ> it's man page says, It looks more like 'no big deal, safe to
 EMZ> ignore signal, just for a process knows that something is up')
 
 EMZ> Last time I plugged the USB-mouse out of its port to hadle the
 EMZ> mess with the cord, and when I plugged it back - hald hanged in
 EMZ> the D state, so did all of the usbconfigs and so on.
 
 EMZ> I had to reboot the FreeBSD just to get my mouse back. Like
 EMZ> we're back in 1996 with an non-OSR Windows 95.
 
 EMZ> It's completely ridiculous.
 >>How-To-Repeat:
 EMZ> I'm pretty sure that if you're actually using FreeBSD, then at
 EMZ> least once in a lifetime you got the need to kill something, you
 EMZ> realise you cannot, and then when trying to understand what the
 EMZ> hell is going on you see the magical D letter in ps's output, which means you're doomed.
 >>Fix:
 EMZ> There's always an answer. Reboot loves you.
 
 not always, I have process going to 'T' state (STOP).
 and it is not killed even when I run 'reboot'
 only hard reboot helps (
 
 as developers sayed:
 >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.
 
 see: bin/164526: kill(1) can not kill process despite on -KILL
 
 
 -- 
 Ñ óâàæåíèåì,
  Êîíüêîâ                          mailto:kes-kes at yandex.ru