From owner-freebsd-current@freebsd.org Wed Jun 29 21:57:36 2016 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 04599B86500 for ; Wed, 29 Jun 2016 21:57:36 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 7A24B28B9; Wed, 29 Jun 2016 21:57:35 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from tom.home (kib@localhost [127.0.0.1]) by kib.kiev.ua (8.15.2/8.15.2) with ESMTPS id u5TLvUHp063614 (version=TLSv1 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Thu, 30 Jun 2016 00:57:31 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua u5TLvUHp063614 Received: (from kostik@localhost) by tom.home (8.15.2/8.15.2/Submit) id u5TLvUcH063613; Thu, 30 Jun 2016 00:57:30 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Thu, 30 Jun 2016 00:57:30 +0300 From: Konstantin Belousov To: Don Lewis Cc: freebsd-current@FreeBSD.org Subject: Re: FreeBSD 11.0-ALPHA5 r302256 kernel panic in filt_proc() Message-ID: <20160629215730.GL38613@kib.kiev.ua> References: <201606292144.u5TLi8Sq085887@gw.catspoiler.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <201606292144.u5TLi8Sq085887@gw.catspoiler.org> User-Agent: Mutt/1.6.1 (2016-04-27) 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=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on tom.home X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Jun 2016 21:57:36 -0000 On Wed, Jun 29, 2016 at 02:44:08PM -0700, Don Lewis wrote: > #10 0xffffffff80a02ddc in filt_proc (kn=0xfffff803c5679a80, > hint=) at /usr/src/sys/kern/kern_event.c:473 > #11 0xffffffff80a0173b in knote (list=, hint=2147483648, > lockflags=) at /usr/src/sys/kern/kern_event.c:2045 > #12 0xffffffff80a0710e in exit1 (td=, > rval=, signo=) > at /usr/src/sys/kern/kern_exit.c:515 > #13 0xffffffff80a0677d in sys_sys_exit (td=0xfffff803c5679a80, > uap=) at /usr/src/sys/kern/kern_exit.c:178 > #14 0xffffffff80eb8b2b in amd64_syscall (td=0xfffff80096b49500, traced=0) > at subr_syscall.c:135 > #15 0xffffffff80e98d9b in Xfast_syscall () > at /usr/src/sys/amd64/amd64/exception.S:396 > #16 0x00000008009298ca in ?? () > Previous frame inner to this frame (corrupt stack?) > Current language: auto; currently minimal > (kgdb) > > > The line numbers above seem to be off. With kgdb from ports I see: > > (kgdb) up > #12 filt_proc (kn=0xfffff803c5679a80, hint=) > at /usr/src/sys/kern/kern_event.c:466 > 466 kn->kn_data = KW_EXITCODE(p->p_xexit, p->p_xsig); > (kgdb) print kn > $1 = (struct knote *) 0xfffff803c5679a80 > (kgdb) print p > $2 = (struct proc *) 0x0 > Please print out the knote, do 'p *kn'. I am esp. interested in the kn->kn_status value. It seems that the knote was already detached,