From owner-freebsd-testing@freebsd.org Sun May 3 23:11:39 2020 Return-Path: Delivered-To: freebsd-testing@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 CC9F22BC89D for ; Sun, 3 May 2020 23:11:39 +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 49FhZM57lGz4QhN for ; Sun, 3 May 2020 23:11:39 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id AE6052BC89C; Sun, 3 May 2020 23:11:39 +0000 (UTC) Delivered-To: testing@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 AE20B2BC89B for ; Sun, 3 May 2020 23:11:39 +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) server-signature RSA-PSS (4096 bits) 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 49FhZM46Nvz4QhJ for ; Sun, 3 May 2020 23:11:39 +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) server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 88A1A1AC67 for ; Sun, 3 May 2020 23:11:39 +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 043NBdfN033983 for ; Sun, 3 May 2020 23:11:39 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 043NBdVm033982 for testing@freebsd.org; Sun, 3 May 2020 23:11:39 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: testing@freebsd.org Subject: [Bug 240049] Flakey test case: lib.libc.gen.getmntinfo_test.getmntinfo_test Date: Sun, 03 May 2020 23:11:39 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: tests X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: mjg@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: testing@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-testing@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Testing on FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 May 2020 23:11:39 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D240049 --- Comment #8 from Mateusz Guzik --- Is this testcase running in parallel with mount/unmount requests for someth= ing else? If not, what's "mount" output while the test is running? It is supposed to be an invariant that the fields tested here are set corre= ctly at mount time, but I see a potential for a race. Prior to my changes the ke= rnel kept overwriting these fields before copyout with expected values. VFS_STATFS(mp, &mp->mnt_stat) called on mount can easily inject transiently "bad" values due to memcpy. Note the rest of the buffer has arbitrary conte= nt. If I'm right, the code was already broken prior to my changes but not in a = way which could have been detected by this testcase. --=20 You are receiving this mail because: You are the assignee for the bug.=