Re: watch(8) stuck in devdrn

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watch(8) stuck in devdrn
\ Robert Watson (31 May 2007)
. \ Giorgos Keramidas (31 May 2007)
. . \ Robert Watson (1 Jun 2007)
. . . \ Hidetoshi Shimokawa (1 Jun 2007)
. . . . \ Jiawei Ye (1 Jun 2007)
. . . . . \ Tai-hwa Liang (1 Jun 2007)
. . . . . . \ Yuri Pankov (1 Jun 2007)
. \ Tai-hwa Liang (1 Jun 2007)
. \ Wilkinson, Alex (4 Jun 2007)
. \ Wilkinson, Alex (4 Jun 2007)

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Subject:	Re: watch(8) stuck in devdrn
Group:	Freebsd-current
From:	Giorgos Keramidas
Date:	31 May 2007

On 2007-05-31 18:38, Robert Watson <rwatson> 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:

% Date: Fri, 6 Apr 2007 13:10:48 +0300
% Message-ID: <20070406101048.GK308>
% From: Kostik Belousov
% Subject: Re: pty releasing but with kern.pts.enable=1?
% To: Giorgos Keramidas
%
% [-- The following data is signed --]
%
% On Fri, Apr 06, 2007 at 03:45:29AM +0300, Giorgos Keramidas wrote:
% > Hi Konstantin,
% >
% > Kris Kennaway suggested I contact you, to ask about a possible pty bug
% > in FreeBSD CVS HEAD. Without the patch below, every time I exit from a
% > process using pty's the process blocks forever.
% >
% > http://people.freebsd.org/~keramida/ptsbug.diff
% >
% > Do you have any idea why dev->si_threadcount never reaches zero for pty
% > devices, or how I can statr troubleshooting this further?
%
% Yes, the issue is known (drivers must not call destroy_dev() from d_close
% method). The patch is being worked on with the help of Tor Egge.
%
% [-- End of signed data --]
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