From owner-freebsd-fs@freebsd.org Tue Aug 30 23:55:28 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 0C7E8BC92C5 for ; Tue, 30 Aug 2016 23:55:28 +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 D6B44265C for ; Tue, 30 Aug 2016 23:55:27 +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 u7UNtQ47087972 for ; Tue, 30 Aug 2016 23:55:27 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: Tue, 30 Aug 2016 23:55:26 +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: mckusick@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: Tue, 30 Aug 2016 23:55:28 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212168 --- Comment #10 from Kirk McKusick --- 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 i= f we are finding freed items on the worklist in softdep_disk_io_initiation(): 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 @@ 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); marker.wk_type =3D D_LAST + 1; /* Not a normal workitem */ I would appreciate your running with this patch and reporting if you get the "dead worklist" error message. --=20 You are receiving this mail because: You are the assignee for the bug.=