Date: Thu, 31 May 2007 21:05:55 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Robert Watson <rwatson@freebsd.org> Cc: current@freebsd.org Subject: Re: watch(8) stuck in devdrn Message-ID: <20070531180555.GA10910@kobe.laptop> In-Reply-To: <20070531183719.B77697@fledge.watson.org> References: <20070531183719.B77697@fledge.watson.org>
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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: % Date: Fri, 6 Apr 2007 13:10:48 +0300 % Message-ID: <20070406101048.GK308@deviant.kiev.zoral.com.ua> % 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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