From owner-freebsd-bugs@FreeBSD.ORG Sat Jun 23 15:30:11 2012 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 40DC4106567E for ; Sat, 23 Jun 2012 15:30:11 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id EB78A8FC15 for ; Sat, 23 Jun 2012 15:30:10 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.5/8.14.5) with ESMTP id q5NFUAWN009998 for ; Sat, 23 Jun 2012 15:30:10 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.5/8.14.5/Submit) id q5NFUA7i009993; Sat, 23 Jun 2012 15:30:10 GMT (envelope-from gnats) Resent-Date: Sat, 23 Jun 2012 15:30:10 GMT Resent-Message-Id: <201206231530.q5NFUA7i009993@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, "W.L. Tai" Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 00E111065679 for ; Sat, 23 Jun 2012 15:21:13 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from red.freebsd.org (red.freebsd.org [IPv6:2001:4f8:fff6::22]) by mx1.freebsd.org (Postfix) with ESMTP id E04768FC08 for ; Sat, 23 Jun 2012 15:21:12 +0000 (UTC) Received: from red.freebsd.org (localhost [127.0.0.1]) by red.freebsd.org (8.14.4/8.14.4) with ESMTP id q5NFLCxc051990 for ; Sat, 23 Jun 2012 15:21:12 GMT (envelope-from nobody@red.freebsd.org) Received: (from nobody@localhost) by red.freebsd.org (8.14.4/8.14.4/Submit) id q5NFLCJx051989; Sat, 23 Jun 2012 15:21:12 GMT (envelope-from nobody) Message-Id: <201206231521.q5NFLCJx051989@red.freebsd.org> Date: Sat, 23 Jun 2012 15:21:12 GMT From: "W.L. Tai" To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: kern/169350: Extraneous output when tracing writes with output redirect to a file X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 Jun 2012 15:30:11 -0000 >Number: 169350 >Category: kern >Synopsis: Extraneous output when tracing writes with output redirect to a file >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sat Jun 23 15:30:10 UTC 2012 >Closed-Date: >Last-Modified: >Originator: W.L. Tai >Release: 9.0 stable >Organization: >Environment: FreeBSD aaa.local 9.0-STABLE FreeBSD 9.0-STABLE #0: Fri Jun 22 20:51:15 HKT 2012 root@aaa.local:/usr/obj/usr/src/sys/TAI amd64 >Description: Extraneous output when tracing writes from entry to return with output redirection to a file. >How-To-Repeat: Consider the following script: test-bug.d #!/usr/sbin/dtrace -s #pragma D option quiet vfs::vop_read:entry, vfs::vop_write:entry /execname != "dtrace"/ { self->flag = 1; } vfs::vop_read:return, vfs::vop_write:return /self->flag/ { this->flag = 1; self->flag = 0; } vfs::vop_read:return, vfs::vop_write:return /this->flag/ { printf("%s\n", execname); } After running dtrace -s test-bug.d -n 'tick-5s { exit(0); }' > /tmp/test the file /tmp/test would contains lines with dtrace, which should not be there. Somehow dtrace has inherit the value of this->flag. >Fix: Work around: Either continue to use self->flag or use the predicate /this->flag && execname != "dtrace"/ >Release-Note: >Audit-Trail: >Unformatted: