From owner-freebsd-bugs@freebsd.org Mon Nov 9 11:49:20 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 A8C0D460C95 for ; Mon, 9 Nov 2020 11:49:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (mailman.nyi.freebsd.org [IPv6:2610:1c1:1:606c::50:13]) by mx1.freebsd.org (Postfix) with ESMTP id 4CV8RN4926z4j2l for ; Mon, 9 Nov 2020 11:49:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 8CED2460D90; Mon, 9 Nov 2020 11:49:20 +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 8CAF6460D0D for ; Mon, 9 Nov 2020 11:49:20 +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 4CV8RN3Tvfz4hvD for ; Mon, 9 Nov 2020 11:49:20 +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 6A90110B4B for ; Mon, 9 Nov 2020 11:49:20 +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 0A9BnK2h009845 for ; Mon, 9 Nov 2020 11:49:20 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 0A9BnKN8009844 for bugs@FreeBSD.org; Mon, 9 Nov 2020 11:49:20 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: Mon, 09 Nov 2020 11:49:19 +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: kib@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@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-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: Mon, 09 Nov 2020 11:49:20 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250954 --- Comment #8 from Konstantin Belousov --- (In reply to Micha=C5=82 G=C3=B3rny from comment #7) Actually not. Or rather, I updated your second example some more to query the list of threads on each stop, and for me it behaves exactly as I would expect it to behave: wait: pid=3D38618, waited=3D38618, ret=3D117f threads: 100447 tid =3D 100447, SIGSTOP set DR0=3D0x601878 (&g_val) on tid=3D100447 wait: pid=3D38618, waited=3D38618, ret=3D117f threads: 100447 100820 tid =3D 100447, SIGSTOP set DR0=3D0x601874 (&g_val2) on tid=3D100447 wait: pid=3D38618, waited=3D38618, ret=3D57f threads: 100447 100820 tid =3D 100820, SIGTRAP w/ PL_FLAG_BORN dr0=3D0x601878, g_val=3D0x601878, g_val2=3D0x601874 wait: pid=3D38618, waited=3D38618, ret=3D57f threads: 100447 100820 tid =3D 100820, SIGTRAP w/ PL_FLAG_EXITED thread started thread joined wait: pid=3D38618, waited=3D38618, ret=3D0 Now you set DR0 using explicit tid, and second PT_SETDBREGS only affects the main thread, while new thread 100820 inherits initial DR0. --=20 You are receiving this mail because: You are the assignee for the bug.=