From owner-freebsd-dtrace@freebsd.org Tue Aug 28 20:22:22 2018 Return-Path: Delivered-To: freebsd-dtrace@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id EE77C109763B for ; Tue, 28 Aug 2018 20:22:21 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 8765395531 for ; Tue, 28 Aug 2018 20:22:21 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 4C9E11097638; Tue, 28 Aug 2018 20:22:21 +0000 (UTC) Delivered-To: dtrace@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 3B8AC1097637 for ; Tue, 28 Aug 2018 20:22:21 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id CF11795524 for ; Tue, 28 Aug 2018 20:22:20 +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 mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 396FC25039 for ; Tue, 28 Aug 2018 20:22:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w7SKMKjg082892 for ; Tue, 28 Aug 2018 20:22:20 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from bugzilla@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w7SKMKBS082890 for dtrace@FreeBSD.org; Tue, 28 Aug 2018 20:22:20 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: bugzilla set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: dtrace@FreeBSD.org Subject: [Bug 230846] dtrace FBT doesn't know about ifuncs Date: Tue, 28 Aug 2018 20:22:20 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: commit-hook@freebsd.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: markj@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-dtrace@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "A discussion list for developers working on DTrace in FreeBSD." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 28 Aug 2018 20:22:22 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230846 --- Comment #4 from commit-hook@freebsd.org --- A commit references this bug: Author: markj Date: Tue Aug 28 20:21:38 UTC 2018 New revision: 338359 URL: https://svnweb.freebsd.org/changeset/base/338359 Log: Allow multiple FBT probes to share a tracepoint. With GNU ifuncs, multiple FBT probes may correspond to the same instruction. fbt_invop() assumed that this could not happen and would return after the first probe found in the global FBT hash table, which might not be the one that's enabled. Fix the problem on x86 by linking probes that share a tracepoint and having each linked probe fire when the tracepoint is hit. PR: 230846 Approved by: re (gjb) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D16921 Changes: head/sys/cddl/dev/fbt/aarch64/fbt_isa.c head/sys/cddl/dev/fbt/arm/fbt_isa.c head/sys/cddl/dev/fbt/fbt.c head/sys/cddl/dev/fbt/fbt.h head/sys/cddl/dev/fbt/mips/fbt_isa.c head/sys/cddl/dev/fbt/powerpc/fbt_isa.c head/sys/cddl/dev/fbt/riscv/fbt_isa.c head/sys/cddl/dev/fbt/x86/fbt_isa.c --=20 You are receiving this mail because: You are on the CC list for the bug.=