From owner-freebsd-bugs@freebsd.org Sun Jul 23 01:03:08 2017 Return-Path: Delivered-To: freebsd-bugs@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 7948ADB26D0 for ; Sun, 23 Jul 2017 01:03:08 +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 67AE86BCDB for ; Sun, 23 Jul 2017 01:03:08 +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 v6N138IY048655 for ; Sun, 23 Jul 2017 01:03:08 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 220930] DTrace, pid provider: Can't get a trace of a malloc function in google-perftools Date: Sun, 23 Jul 2017 01:03:08 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: misc X-Bugzilla-Version: 11.0-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: yuri@rawbw.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.created Message-ID: 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: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Jul 2017 01:03:08 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220930 Bug ID: 220930 Summary: DTrace, pid provider: Can't get a trace of a malloc function in google-perftools Product: Base System Version: 11.0-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: misc Assignee: freebsd-bugs@FreeBSD.org Reporter: yuri@rawbw.com Created attachment 184607 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D184607&action= =3Dedit malloc-user-process.d Here's how to repeat: 1. Install qTox and google perftools: pkg install qTox google-perftools 2. Load dtraceall kernel module: kldload dtraceall.ko 3. Place the attached scripts 'start-process-and-wait' and 'malloc-user-process.d' into some directory and set +x flag on both. 4. As a regular user, start qTox in stopped mode: LD_PRELOAD=3D/usr/local/lib/libtcmalloc.so ./start-process-and-wait /usr/local/bin/qtox 5. As root, with the pid printed on step 4, start dtrace: ./malloc-user-process.d {pid} > out.log In many cases, step 5 prints one of these two error messages and exits: > dtrace: failed to compile script ./malloc-user-process.d: line 9: Invalid= argument or > dtrace: failed to compile script ./malloc-user-process.d: line 13: failed= to create return probe for 'malloc': Unknown variable name In both cases the debugged process gets continued. In rare other cases dtrace continues and eventually deadlocks: > dtrace: script './malloc-user-process.d' matched 2 probes - at this point qtox process stays in TX+ state, and dtrace stays in S+ sta= te forever. All errors are invalid. pidNNN argument should be valid in line 9, and mall= oc symbol is always present by the virtue of LD_PRELOAD of the library with 'malloc' symbol in it. dtrace shouldn't deadlock. Ctrl-C on dtrace doesn't stop it. However, 'kill= all -9 dtrace' does. --=20 You are receiving this mail because: You are the assignee for the bug.=