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Date: Fri, 1 Jun 2007 13:01:08 +0800 (CST)
From: Tai-hwa Liang <avatar@mmlab.cse.yzu.edu.tw>
To: Jiawei Ye <leafy7382@gmail.com>
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References: <20070531183719.B77697@fledge.watson.org>
	<20070531180555.GA10910@kobe.laptop>
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Cc: Giorgos Keramidas <keramida@ceid.upatras.gr>,
	Hidetoshi Shimokawa <simokawa@freebsd.org>,
	Robert Watson <rwatson@freebsd.org>, current@freebsd.org, scsi@freebsd.org
Subject: Re: watch(8) stuck in devdrn
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On Fri, 1 Jun 2007, Jiawei Ye wrote:
> On 6/1/07, Hidetoshi Shimokawa <simokawa@freebsd.org> wrote:
>> The problem doesn't seem specific to tty sub system.
>> I have similar problem with scsi_target.
>> 
>> On 6/1/07, Robert Watson <rwatson@freebsd.org> wrote:
>> >
>> > On Thu, 31 May 2007, Giorgos Keramidas wrote:
>> >
>> > > On 2007-05-31 18:38, Robert Watson <rwatson@freebsd.org> wrote:
>> > >> I was using watch(8) this afternoon, and on trying to quit, ran into 
>> this:
>> > >>
>> > >>   peppercorn:~> ps axl | grep watch
>> > >>     0 14200 14194   0  -8  0  3416  1056 devdrn D     p2-   0:00.01 
>> watch -W tt
>> > >>
>> > >> It was running on a pty, but the target tty was ttyv1.
>> > >
>> > > If you have kern.pts.enable=1 you may have to use:
>> > > http://hg.hellug.gr/freebsd/src-keramida/file/944ac3982de1/pty-devdrn
>> > >
>> > > Without this patch and kern.pts.enable=1 all ptys seem to get stuck in
>> > > devdrn on process exit.  AFAIK, Kostik Belousov and Tor Egge know this 
>> and
>> > > are already working on a fix:
>> >
>> > I'm not using pts.enable on this box.
>> >
> mount_smbfs has been having this problem for quite a while too.

   By any chance you can give following patches a try?

 	http://people.freebsd.org/~kib/misc/destroy_dev_sched.6.patch
 	http://people.freebsd.org/~avatar/destroy_dev_sched_addon.2.patch

-- 
Thanks,

Tai-hwa Liang