From owner-freebsd-current@freebsd.org Mon Aug 10 11:05:00 2020 Return-Path: Delivered-To: freebsd-current@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 E8CEB37EB4A for ; Mon, 10 Aug 2020 11:05:00 +0000 (UTC) (envelope-from hps@selasky.org) Received: from mail.turbocat.net (turbocat.net [IPv6:2a01:4f8:c17:6c4b::2]) (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 mx1.freebsd.org (Postfix) with ESMTPS id 4BQCmD0qJtz4938 for ; Mon, 10 Aug 2020 11:04:59 +0000 (UTC) (envelope-from hps@selasky.org) Received: from hps2020.home.selasky.org (unknown [178.17.145.105]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by mail.turbocat.net (Postfix) with ESMTPSA id ABBB8260287; Mon, 10 Aug 2020 13:04:57 +0200 (CEST) Subject: Re: Kernel crash during video transcoding To: Alexandre Levy Cc: freebsd-current@freebsd.org References: <13793020-1bde-b13f-65e3-909e27d876ad@selasky.org> <4e9d9a89-4883-1f1c-c796-e5925fd171cc@selasky.org> From: Hans Petter Selasky Message-ID: <51a2fe4f-5a3e-8d24-19e2-3cdaa8378015@selasky.org> Date: Mon, 10 Aug 2020 13:04:35 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4BQCmD0qJtz4938 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of hps@selasky.org designates 2a01:4f8:c17:6c4b::2 as permitted sender) smtp.mailfrom=hps@selasky.org X-Spamd-Result: default: False [-2.96 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+a:mail.turbocat.net:c]; NEURAL_HAM_LONG(-0.96)[-0.958]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[selasky.org]; NEURAL_HAM_MEDIUM(-1.05)[-1.048]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.66)[-0.657]; RCPT_COUNT_TWO(0.00)[2]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:2a01:4f8::/29, country:DE]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Aug 2020 11:05:01 -0000 Hi, On 2020-08-10 12:59, Alexandre Levy wrote: > Looking at the code, the error happens during the call to VM_OBJECT_WLOCK > (memory page locking for write ?) in the intel_freebsd.c (see [1] below). > I'm out for a few days but I'll try to dig more into it when I'm back next > weekend although I have no experience in the drm-devel-kmod codebase. In > the meantime if you have any suggestions on debugging this further I'm > happy to follow them. The problem is likely that the vm_obj is NULL. I think I recall that this function is special and can only be called from a certain context, unlike in Linux. Will need the full backtrace with line numbers in order to debug this. --HPS