From owner-freebsd-bugs@freebsd.org Tue Nov 10 12:56:54 2020 Return-Path: Delivered-To: freebsd-bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id D70822EF652 for ; Tue, 10 Nov 2020 12:56:54 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 4CVntt5Pqkz3sGh for ; Tue, 10 Nov 2020 12:56:54 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id B7DBA2EF6C9; Tue, 10 Nov 2020 12:56:54 +0000 (UTC) Delivered-To: bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id B79932EF4E4 for ; Tue, 10 Nov 2020 12:56:54 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4CVntt29psz3s7Z for ; Tue, 10 Nov 2020 12:56:53 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 8AA7422BF1 for ; Tue, 10 Nov 2020 12:56:52 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 0AACuq1a006550 for ; Tue, 10 Nov 2020 12:56:52 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 0AACuqTb006549 for bugs@FreeBSD.org; Tue, 10 Nov 2020 12:56:52 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 250954] ptrace(): weird ordering between inheriting debug registers and reporting a new thread Date: Tue, 10 Nov 2020 12:56:51 +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: 12.2-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: p-freebsd@labath.sk X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc 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-bugs@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Nov 2020 12:56:54 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250954 Pavel Labath changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |p-freebsd@labath.sk --- Comment #15 from Pavel Labath --- Hi all. I have a semi-random peanut gallery comment. This talk of two events has reminded me of how thread creating works on lin= ux. There, the tracer indeed gets two events for thread creation, one on the main(parent) thread, and one for the newly created child thread. The parent event (PTRACE_EVENT_CLONE) comes with the pid of the new thread,= and it allows the tracer to wait for the creation event on the newly created thread, if he chooses to do that. Lldb chooses to do that, as it makes it easier to reason about the state of the process. I am not very familiar with the ptrace model on freebsd (I understand there= are significant differences), but it sounds like something like that might be useful here too... --=20 You are receiving this mail because: You are the assignee for the bug.=