Date: Fri, 1 Jun 2007 18:55:39 +0800 (CST) From: Tai-hwa Liang <avatar@mmlab.cse.yzu.edu.tw> To: Kostik Belousov <kostikbel@gmail.com> Cc: current@freebsd.org, scsi@freebsd.org, Robert Watson <rwatson@freebsd.org>, Giorgos Keramidas <keramida@ceid.upatras.gr>, Hidetoshi Shimokawa <simokawa@freebsd.org>, Jiawei Ye <leafy7382@gmail.com> Subject: Re: watch(8) stuck in devdrn Message-ID: <07060118545413.14036@www.mmlab.cse.yzu.edu.tw> In-Reply-To: <20070601084859.GL2268@deviant.kiev.zoral.com.ua> References: <20070531183719.B77697@fledge.watson.org> <20070531180555.GA10910@kobe.laptop> <20070601010212.F77697@fledge.watson.org> <626eb4530705311711h69322a54ga7c49aea3fe4ab27@mail.gmail.com> <c21e92e20705311847w5c5816bay1469d95964267581@mail.gmail.com> <07060112584613.12429@www.mmlab.cse.yzu.edu.tw> <20070601084859.GL2268@deviant.kiev.zoral.com.ua>
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On Fri, 1 Jun 2007, Kostik Belousov wrote: > On Fri, Jun 01, 2007 at 01:01:08PM +0800, Tai-hwa Liang wrote: >> 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/~kib/misc/destroy_dev_sched.8.patch >> http://people.freebsd.org/~avatar/destroy_dev_sched_addon.2.patch > At least snp(4) change potentially opens the races. Could you be more specific on this issue? -- Thanks, Tai-hwa Liang
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