From nobody Sat Sep 06 14:21:06 2025 X-Original-To: freebsd-current@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4cJwPK6sSrz66gRk for ; Sat, 06 Sep 2025 14:21:09 +0000 (UTC) (envelope-from cy.schubert@cschubert.com) Received: from omta003.cacentral1.a.cloudfilter.net (omta001.cacentral1.a.cloudfilter.net [3.97.99.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "Client", Issuer "CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4cJwPJ4pn7z3k64 for ; Sat, 06 Sep 2025 14:21:08 +0000 (UTC) (envelope-from cy.schubert@cschubert.com) Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=permerror reason="p tag has invalid value: quarantine rua=mailto:p[ostmaster@cschubert.com" header.from=cschubert.com (policy=permerror); spf=pass (mx1.freebsd.org: domain of cy.schubert@cschubert.com designates 3.97.99.32 as permitted sender) smtp.mailfrom=cy.schubert@cschubert.com Received: from shw-obgw-4001a.ext.cloudfilter.net ([10.228.9.142]) by cmsmtp with ESMTPS id uqdRu0Np89JM2utmuuwcV9; Sat, 06 Sep 2025 14:21:08 +0000 Received: from spqr.komquats.com ([70.66.136.217]) by cmsmtp with ESMTPSA id utmtuxJKhWX70utmuuFKUB; Sat, 06 Sep 2025 14:21:08 +0000 X-Auth-User: cschuber X-Authority-Analysis: v=2.4 cv=d71WygjE c=1 sm=1 tr=0 ts=68bc4354 a=h7br+8Ma+Xn9xscxy5znUg==:117 a=h7br+8Ma+Xn9xscxy5znUg==:17 a=kj9zAlcOel0A:10 a=yJojWOMRYYMA:10 a=6I5d2MoRAAAA:8 a=EkcXrb_YAAAA:8 a=YxBL1-UpAAAA:8 a=pcJxfTGPG_QVHFLFXHEA:9 a=CjuIK1q_8ugA:10 a=LK5xJRSDVpKd5WXXoEvA:22 a=Ia-lj3WSrqcvXOmTRaiG:22 Received: from slippy.cwsent.com (slippy.cwsent.com [10.1.1.91]) by spqr.komquats.com (Postfix) with ESMTP id F341EBD for ; Sat, 06 Sep 2025 07:21:06 -0700 (PDT) Received: by slippy.cwsent.com (Postfix, from userid 1000) id BEC45282; Sat, 06 Sep 2025 07:21:06 -0700 (PDT) X-Mailer: exmh version 2.9.0 11/07/2018 with nmh-1.8+dev Reply-to: Cy Schubert From: Cy Schubert X-os: FreeBSD X-Sender: cy@cwsent.com X-URL: http://www.cschubert.com/ To: freebsd-current@freebsd.org Subject: Discuss Bug 289320 - graphics/drm-66-kmod: Page fault on 16-CURRENT List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@FreeBSD.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sat, 06 Sep 2025 07:21:06 -0700 Message-Id: <20250906142106.BEC45282@slippy.cwsent.com> X-CMAE-Envelope: MS4xfCwYgzb0QLoTuJOpcH6tvnD4+ycD6kIIyugDFnwdFZe1OsbDZrtGPl4tOZgrM8/MRsi+aHom00lvQ0B39+1FXfognyEbf5hIp8SVQ8kGWfDDnH6HNS/a SonJGvRtKvMU2g5ZKqAv0hbFDJ92XR/JoZxDBfWC14cpKvOBpZbvsT9EEcEPnQ511aQYPopJLMeQmfF7vkNMSP1cP/AFg+Vrwno= X-Spamd-Bar: --- X-Spamd-Result: default: False [-3.22 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-0.999]; NEURAL_HAM_MEDIUM(-0.92)[-0.916]; MV_CASE(0.50)[]; RWL_MAILSPIKE_EXCELLENT(-0.40)[3.97.99.32:from]; R_SPF_ALLOW(-0.20)[+ip4:3.97.99.32/31]; MIME_GOOD(-0.10)[text/plain]; RCVD_IN_DNSWL_LOW(-0.10)[3.97.99.32:from]; RCVD_VIA_SMTP_AUTH(0.00)[]; ASN(0.00)[asn:16509, ipnet:3.96.0.0/15, country:US]; MIME_TRACE(0.00)[0:+]; RCPT_COUNT_ONE(0.00)[1]; ARC_NA(0.00)[]; DMARC_BAD_POLICY(0.00)[cschubert.com : p tag has invalid value: quarantine rua=mailto:p[ostmaster@cschubert.com]; R_DKIM_NA(0.00)[]; MLMMJ_DEST(0.00)[freebsd-current@freebsd.org]; TO_DN_NONE(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; HAS_REPLYTO(0.00)[Cy.Schubert@cschubert.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_TLS_LAST(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; RCVD_COUNT_THREE(0.00)[4]; REPLYTO_EQ_FROM(0.00)[] X-Rspamd-Queue-Id: 4cJwPJ4pn7z3k64 Hi, I'd like to open up discussion about a weird bug I stumbled across on Thursday. You can get the gory details, including backtrace in PR/289320. Long story short, after the FreeBSD version bump from 15 to 16 amdgpu panics on a kernel page fault. For fun I reverted, locally, the commit that updated the version strings in FreeBSD-CURRENT from 15 to 16, reverting 8b4e4c2737305df8807abc6cd054a32586085c93 on that particular machine, a Framework 13 laptop. The panic was solved. My other machines don't use amdgpu, they either don't use X or in the case of my HP 840, it uses the i915 driver (also part of drm-66-kmod), which works after the 15 to 16 version bump. But the 15 to 16 version bump causes amdgpu also from drm-66-kmod to reference a NULL pointer. What in drm-66-kmod would be sensitive to a FreeBSD version bump? -- Cheers, Cy Schubert FreeBSD UNIX: Web: https://FreeBSD.org NTP: Web: https://nwtime.org e**(i*pi)+1=0