From owner-freebsd-stable@FreeBSD.ORG Fri Dec 5 09:57:13 2014 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id AE3E63D3; Fri, 5 Dec 2014 09:57:13 +0000 (UTC) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 38776A9; Fri, 5 Dec 2014 09:57:13 +0000 (UTC) Received: from tom.home (kostik@localhost [127.0.0.1]) by kib.kiev.ua (8.14.9/8.14.9) with ESMTP id sB59v2T1017850 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 5 Dec 2014 11:57:02 +0200 (EET) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.9.2 kib.kiev.ua sB59v2T1017850 Received: (from kostik@localhost) by tom.home (8.14.9/8.14.9/Submit) id sB59v0nZ017849; Fri, 5 Dec 2014 11:57:00 +0200 (EET) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Fri, 5 Dec 2014 11:57:00 +0200 From: Konstantin Belousov To: Jan Mikkelsen Subject: Re: 10.1 regression: process using serial port becomes unkillable when no modem control signals Message-ID: <20141205095659.GF97072@kib.kiev.ua> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.0 X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on tom.home Cc: marcel@freebsd.org, FreeBSD Stable Mailing List X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Dec 2014 09:57:13 -0000 On Fri, Dec 05, 2014 at 06:44:51PM +1100, Jan Mikkelsen wrote: > Hi, > > I have just found this problem on a machine upgraded to 10.1. > > When running mgetty on a serial port with nothing connected and then killing it the process becomes unkillable. This prevents ???shutdown -r??? from completing, which is particularly annoying. > > Giving the serial port a device which provides the right modem control signals lets the process exit immediately. The same hardware with 9.3 was fine. > > Below is the kernel stack trace on the unkillable process. > > Does this ring any bells for anyone? This sounds as something that might be fixed by r272786 and r272789 in HEAD. I did not looked into details too close. The changes are not in stable/10, apply manually and test. > > Thanks, > > Jan Mikkelsen > > (kgdb) bt > #0 sched_switch (td=0xfffff80236e1a920, newtd=, flags=) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/sched_ule.c:1945 > #1 0xffffffff80939ba1 in mi_switch (flags=260, newtd=0x0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_synch.c:494 > #2 0xffffffff80976d6b in sleepq_catch_signals (wchan=0xfffff8000c7344b8, pri=0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/subr_sleepqueue.c:426 > #3 0xffffffff80976c1f in sleepq_wait_sig (wchan=0x0, pri=0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/subr_sleepqueue.c:631 > #4 0xffffffff808e345a in _cv_wait_sig (cvp=0xfffff8000c7344b8, lock=0xfffff8000c734408) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_condvar.c:258 > #5 0xffffffff809957a5 in ttydev_leave (tp=0xfffff8000c734400) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/tty.c:1392 > #6 0xffffffff80994d30 in ttydev_close (dev=, fflag=0, devtype=0, td=0x0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/tty.c:353 > #7 0xffffffff8081ec63 in devfs_close (ap=0xfffffe0c541d57e0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/fs/devfs/devfs_vnops.c:592 > #8 0xffffffff80e6d281 in VOP_CLOSE_APV (vop=, a=) at vnode_if.c:535 > #9 0xffffffff809df673 in vn_close (vp=0xfffff80236a6f588, flags=3, file_cred=0xfffff806a300b200, td=0xfffff80236e1a920) at vnode_if.h:225 > #10 0xffffffff809de4c8 in vn_closefile (fp=0xfffff8001243d9b0, td=0xfffff80236e1a920) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/vfs_vnops.c:1557 > #11 0xffffffff808204bc in devfs_close_f (fp=0xfffff8001243d9b0, td=0x0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/fs/devfs/devfs_vnops.c:611 > #12 0xffffffff808ed249 in _fdrop (fp=0xfffff8001243d9b0, td=0x0) at file.h:343 > #13 0xffffffff808ef9ae in closef (fp=, td=) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_descrip.c:2335 > #14 0xffffffff808ef5c9 in fdescfree (td=0xfffff80236e1a920) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_descrip.c:2103 > #15 0xffffffff808fb8fb in exit1 (td=0xfffff80236e1a920, rv=) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_exit.c:329 > #16 0xffffffff808fb37e in sys_sys_exit (td=0x0, uap=) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_exit.c:153 > #17 0xffffffff80d4f521 in amd64_syscall (td=0xfffff80236e1a920, traced=0) at subr_syscall.c:134 > > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"