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[80.56.215.227]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-91c10c48c49sm2815656d6.41.2026.10.20.10.10.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 20 Oct 2026 10:10:49 -0700 (PDT) From: Arend van Spriel To: Jason Perlow , , , CC: , , , , , , Date: Tue, 20 Oct 2026 19:10:46 +0200 Message-ID: <1a15a4b49f0.2873.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com> In-Reply-To: References: User-Agent: AquaMail/2.7.0 (build: 200700061) Subject: Re: [REGRESSION] intel-iommu/brcmfmac DMAR fault on Broadcom PCIe wifi, v7.3-rc7 -> v7.3 final -- candidate mechanism and proposed fix path X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="us-ascii" Content-Transfer-Encoding: 8bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Op 20 oktober 2026 18:02:30 schreef Jason Perlow : > NOTE: an earlier report on this bug from us bounced off one of these lists > due to HTML/multipart formatting from the mail client used -- apologies, > switching clients. This mail includes the full original report plus a > follow-up, merged into one self-contained report since the original never > reached anyone. > > === ORIGINAL REPORT === > > Hardware: Intel CoffeeLake-H platforms, various. The affected device is a > Broadcom BCM4364 802.11ac PCIe wifi adapter (14e4:4464) at 0000:05:00.0 on > an Apple MacBookPro16,1 (T2 Mac). Aditya, including you directly since this > is T2 hardware; copying iommu/pci/wireless because the fault signature and > the fact that it reproduces on only one of five tested machines (at the > time of the original report -- see follow-up below, that has since changed) > looked like it needed eyes on the core IOMMU/PCI path, not the driver. [...] > THE ONE ANOMALY WE CAN'T YET EXPLAIN > > Despite the last two items above being unchanged, the actual generated > .config has CONFIG_INTEL_IOMMU_DEFAULT_ON unset after make olddefconfig > against the rc7 source tree, but =y after the same process against the > final source tree, even though our template explicitly answers "# > CONFIG_INTEL_IOMMU_DEFAULT_ON is not set" in both cases. Our working theory > is that some other symbol started selecting/implying INTEL_IOMMU_DEFAULT_ON > between rc7 and final -- which would override an explicitly-seeded "not > set" answer during olddefconfig resolution -- but we have not identified > which one yet. Simply run make menuconfig and it should be able to tell you how it is selected. Regards, Arend>