Date: Thu, 13 Nov 1997 23:25:43 +0100 (MEZ) From: Robert Eckardt <roberte@MEP.Ruhr-Uni-Bochum.de> To: archie@whistle.com (Archie Cobbs) Cc: Shimon@i-connect.net, freebsd-hackers@FreeBSD.ORG Subject: Re: unkillable process Message-ID: <199711132225.XAA01539@ghost.mep.ruhr-uni-bochum.de> In-Reply-To: <199711131848.KAA19595@bubba.whistle.com> from Archie Cobbs at "Nov 13, 97 10:48:17 am"
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It was Archie Cobbs who wrote:
> Simon Shapiro writes:
> > Hi Archie Cobbs; On 12-Nov-97 you wrote:
> > > Try the following experiment (on 2.2 and mabye 3.0):
> > >
> > > 1. Create a named pipe
> > > 2. Start typing into it using cat
> > > 3. Hit control-C as many times as you want
> > >
> > > You'll see that the process will not die even with kill -9,
> > > as it is stuck in uninterrupible disk sleep ("fifo").
I tried with `cat'.
23:16 ghost: /home/re 0% mkfifo p
23:16 ghost: /home/re 0% /bin/cat - > p
sdjksdfjk
lksjflsfjkd
^C^C^?^?
^Z^Z^Z
Beendet
23:17 ghost: /home/re 143%
23:17 ghost: /home/re 143%
I didn't find `cat' in the process list, though I used the
tcsh-external program in /bin. However, `ps -auxlw' showed:
roberte 1524 0.0 1.3 696 784 p4 IV+ 11:16pm 0:00.00 -csh (tcsh) 100 1524 307 0 2 0 696 784 fifo IV+ p4 0:00.00 -csh (tcsh)
After a simple `kill 1524' the above cat returned (`Beendet').
This is on 2.2.2-RELEASE.
> Hmm... does anyone else besides me have the opinion that,
> while it may be typical, this behavior is also *broken*?
If at least `kill -9' doesn't/didn't work, I would definitely call
it an error (since it may cause e.g. an uncleanly umounted filesystem).
> Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com
Robert
--
Robert Eckardt \\ FreeBSD -- solutions for a large universe.(tm)
RobertE@MEP.Ruhr-Uni-Bochum.de \\ What do you want to boot tomorrow ?(tm)
http://WWW.MEP.Ruhr-Uni-Bochum.de/~roberte
For PGP-key finger roberte@gluon.MEP.Ruhr-Uni-Bochum.de
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