From owner-freebsd-bugs@freebsd.org Fri Aug 4 16:19:33 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 22735DBCAA3 for ; Fri, 4 Aug 2017 16:19:33 +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 031CB6E6F8 for ; Fri, 4 Aug 2017 16:19:33 +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 v74GJWDd048907 for ; Fri, 4 Aug 2017 16:19:32 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 219399] System panics after several hours of 14-threads-compilation orgies using poudriere on AMD Ryzen... Date: Fri, 04 Aug 2017 16:19:32 +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: 11.1-RELEASE X-Bugzilla-Keywords: patch X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: truckman@FreeBSD.org 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: attachments.created 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: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Aug 2017 16:19:33 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219399 --- Comment #204 from Don Lewis --- Created attachment 185022 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D185022&action= =3Dedit program to cause Ryzen hang/reboot on tweaked FreeBSD by executing code in = high memory If you modify the FreeBSD kernel to lower the shared page, but leave sv_max= user at its original value so that a user program can mmap the page at 0x7ffffffff000, the attached program will fill that page with RET instruct= ions and perform calls to those in a loop. I have not observed any issues with calls to the RET instructions at 0x7fffffffff3f or below. When the RET instruction at 0x7fffffffff40 is executed, my machine will typically silent= ly reboot without a panic message, or it will sometimes hang with the screen blanked. This test is the most sensitive on core 0, which handles most interrupts, so run under "cpuset -l 0" for best results. The problem appea= rs to be triggered when the RET instruction is interrupted. It is possible to load and execute arbitrary code for other experiments. --=20 You are receiving this mail because: You are the assignee for the bug.=