From owner-freebsd-bugs@freebsd.org Sat Aug 8 22:40:12 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 6A8B637F424 for ; Sat, 8 Aug 2020 22:40:12 +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 4BPHHJ2FsXz4Pmm for ; Sat, 8 Aug 2020 22:40:12 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 4D67637EFD8; Sat, 8 Aug 2020 22:40:12 +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 4D2BB37F423 for ; Sat, 8 Aug 2020 22:40:12 +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 4BPHHJ1NH9z4PsV for ; Sat, 8 Aug 2020 22:40:12 +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 0F863F4FB for ; Sat, 8 Aug 2020 22:40:12 +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 078MeBrL062661 for ; Sat, 8 Aug 2020 22:40:11 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 078MeBDi062660 for bugs@FreeBSD.org; Sat, 8 Aug 2020 22:40:11 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 243225] "mpr0: Out of chain frames" boot hang after clang 9.0.1 import (probably timing, not compiler related) Date: Sat, 08 Aug 2020 22:40:11 +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: 12.0-STABLE X-Bugzilla-Keywords: regression X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: terry-freebsd@glaver.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: 2.1.33 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 08 Aug 2020 22:40:12 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D243225 --- Comment #6 from Terry Kennedy --- (In reply to Terry Kennedy from comment #5) Following up to my own post. I just emailed Warner Losh the following (forgetting that the discussion was also going on in this PR): The system is a Dell PowerEdge R730 with dual E5-2643 v3 CPUs, 128GB RAM, PERC H730 Mini RAID controller (for internal SAS drives) and a Dell "12Gb External SAS Adapter" (LSI SAS 3008) which is the problem controller. Since I emailed you last, Dell changed it again (they're getting irritated at this point) with no change. With a r364046 kernel from today, the system boots fine with hyper- threading enabled, but shows thenmprmhang with hyperthreading disabled. The previous kernel worked with hyperthreading disabled - as I've said, this appears to be timing-related as it first showed up after the LLVM 9.0.0 import into 12-STABLE. A verbose boot didn't appear to show anything, but as the kernel mes- sage buffer never gets written to disk because of the hang, I have to play the boot sequence back as a video from the internal remote manage- ment card. Also, sometimes a verbose boot works, since this is a timing- related Heisenbug, apparently. I have created a directory https://www.glaver.org/transient/imp which has (so far) dmesg.boot and pciconf.txt from a good boot, bootcapture_ bad.dvc from a non-hyperthreaded boot hang, bootcapture_good.dvc from a successful hyperthreaded boot. and videoplayer.zip which is the play- er for .dvc files. It contains a Windows .exe and a jar file and shell script for Linux (and presumably FreeBSD with Java and a GUI). I can provide remote access to the Dell iDRAC 8 Enterprise card which allows console viewing and all sorts of other stuff, like reset / power cycle and access to BIOS setup, etc. if needed. Let me know if there is anything else you need. --=20 You are receiving this mail because: You are the assignee for the bug.=