From owner-freebsd-fs@freebsd.org Fri Sep 2 23:13:08 2016 Return-Path: Delivered-To: freebsd-fs@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 77161BCD4FB for ; Fri, 2 Sep 2016 23:13:08 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4D64BA41 for ; Fri, 2 Sep 2016 23:13:08 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id u82ND7mP014320 for ; Fri, 2 Sep 2016 23:13:08 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-fs@FreeBSD.org Subject: [Bug 212168] [panic] [UFS] use-after-free panic (0xdeadc0dedeadc0de) Date: Fri, 02 Sep 2016 23:13:07 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.0-RC1 X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: gjb@FreeBSD.org X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-fs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Sep 2016 23:13:08 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212168 --- Comment #13 from Glen Barber --- (In reply to Kirk McKusick from comment #10) > It appears that there is an item on the worklist that has been prematurely > freed. This freeing should be impossible as anything on a worklist has its > ONWORKLIST flag set and the worklist freeing routine will panic if the > ONWORKLIST flag is set. However I have written the following check to see= if > we are finding freed items on the worklist in softdep_disk_io_initiation(= ): >=20 > Index: sys/ufs/ffs/ffs_softdep.c > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > --- sys/ufs/ffs/ffs_softdep.c (revision 305057) > +++ sys/ufs/ffs/ffs_softdep.c (working copy) > @@ -9949,6 +9949,13 @@ >=20=20 > if ((wk =3D LIST_FIRST(&bp->b_dep)) =3D=3D NULL) > return; > + if (wk->wk_type > D_LAST + 1) { > + printf("dead worklist: %p next %p prev %p type %s state > 0x%X\n", > + wk, wk->wk_list.le_next, wk->wk_list.le_prev, > + TYPENAME(wk->wk_type), wk->wk_state); > + LIST_INIT(&bp->b_dep); > + return; > + } > ump =3D VFSTOUFS(wk->wk_mp); >=20=20 > marker.wk_type =3D D_LAST + 1; /* Not a normal workitem */ >=20 > I would appreciate your running with this patch and reporting if you get = the > "dead worklist" error message. I do not know what information you want from ddb, and I never thought I'd e= ver say this, but "yay, the machine finally crashed again." I will leave the machine in its current state unless instructed otherwise. dead worklist: 0xfffffd080edd5400 next 0xdeadc0dedeadc0de prev 0xdeadc0dedeadc0de type ??? state 0xDEADC0 panic: Bad link elm 0xfffffd00b7e0ba00 prev->next !=3D elm Please let me know what additional information you want. --=20 You are receiving this mail because: You are the assignee for the bug.=