From owner-freebsd-bugs@freebsd.org Sat Sep 12 21:09:20 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 C480D3E2F39 for ; Sat, 12 Sep 2020 21:09:20 +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 4BplcJ4vbzz4WLl for ; Sat, 12 Sep 2020 21:09:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id A63703E2F38; Sat, 12 Sep 2020 21:09:20 +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 A5FAC3E30AD for ; Sat, 12 Sep 2020 21:09:20 +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 4BplcJ3xTsz4WP4 for ; Sat, 12 Sep 2020 21:09:20 +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 6667A1B14C for ; Sat, 12 Sep 2020 21:09:20 +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 08CL9Kx1073588 for ; Sat, 12 Sep 2020 21:09:20 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 08CL9Kse073586 for bugs@FreeBSD.org; Sat, 12 Sep 2020 21:09:20 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 248659] random system freezes Date: Sat, 12 Sep 2020 21:09:19 +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: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: rkoberman@gmail.com 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: 2.1.33 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 12 Sep 2020 21:09:20 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248659 rkoberman@gmail.com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rkoberman@gmail.com --- Comment #3 from rkoberman@gmail.com --- Seeing the same issue on my Lenovo L15 running current on a Comet Lake CPU. Problem occurs in single-user mode and is mitigated by keyboard activity. T= his is a regression as the problem does not occur on 12.1-RELEASE-P8. Problem h= as occurred twice during boot, most recently after lo0 came up but before em0 = or rtwn were started. Happens when system is busy (compiles on all cores) or i= dle. GENERIC-NODEBUG kernel except using SCHED_4BSD. Will shortly build GENERIC-SCHED_4BSD. System gets very warm after the freeze and then cools, probably due to the firmware slowing the processor. This seems to indicate a possible loop in t= he kernel. As long as I keep the keyboard reasonably active, the system does not seem = to hang. While several times the freeze occurred when I was not closely watchi= ng the system, I am not aware of the system staying up longer than 10 minutes. When running in graphic mode (X11/MATE), it has frozen when I was typing on= at least one occasion. This could have been simple bad luck. Seems somewhat mo= re stable when in graphic mode.=20 >From dmesg: FreeBSD 13.0-CURRENT #2 r365481M: Tue Sep 8 20:16:02 PDT 2020 root@ptavv:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG amd64 FreeBSD clang version 11.0.0 (git@github.com:llvm/llvm-project.git llvmorg-11.0.0-rc2-0-g414f32a9e86)reeBSD clang version 11.0.0 (git@github.com:llvm/llvm-project.git llvmorg-11.0.0-rc2-0-g414f32a9e86) VT(efifb): resolution 1920x1080 CPU: Intel(R) Core(TM) i5-10210U CPU @ 1.60GHz (2112.11-MHz K8-class CPU) Origin=3D"GenuineIntel" Id=3D0xa0660 Family=3D0x6 Model=3D0xa6 Steppi= ng=3D0 =20 Features=3D0xbfebfbff =20 Features2=3D0x7ffafbbf AMD Features=3D0x2c100800 AMD Features2=3D0x121 Structured Extended Features=3D0x29c67af Structured Extended Features3=3D0xbc000400 XSAVE Features=3D0xf IA32_ARCH_CAPS=3D0x2b VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID TSC: P-state invariant, performance statistics real memory =3D 4294967296 (4096 MB) avail memory =3D 3746226176 (3572 MB) Event timer "LAPIC" quality 600 ACPI APIC Table: --=20 You are receiving this mail because: You are the assignee for the bug.=