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Fri, 22 May 2026 17:07:28 -0700 (PDT) Received: from localhost ([2a00:79e0:2e7c:8:c51f:b7da:e920:bf64]) by smtp.gmail.com with UTF8SMTPSA id a92af1059eb24-1366a4011d9sm2122398c88.6.2026.05.22.17.07.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 22 May 2026 17:07:27 -0700 (PDT) Date: Fri, 22 May 2026 17:07:24 -0700 From: Brian Norris To: Radu Rendec Cc: Thomas Gleixner , Manivannan Sadhasivam , Daniel Tsai , Marek =?iso-8859-1?Q?Beh=FAn?= , Krishna Chaitanya Chundru , Bjorn Helgaas , Rob Herring , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Lorenzo Pieralisi , Jingoo Han , Brian Masney , Eric Chanudet , Jared Kangas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 3/3] PCI: dwc: Enable MSI affinity support Message-ID: References: <20251128212055.1409093-1-rrendec@redhat.com> <20251128212055.1409093-4-rrendec@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: (Updating Radu's email; dropping another bouncing email) On Fri, May 22, 2026 at 01:27:43PM -0700, Brian Norris wrote: > I'll see if I can learn anything more here on my own, but I figured I'd > report it in case you have any thoughts or leads I should investigate. In an hour or two of poking, all I've learned so far is that the problem also seems to go away if I: (a) add a few dump_stack() and other noisy logs to a few key places (for now, __pci_write_msi_msg(), pci_power_up() failures, and irq_chip_redirect_set_affinity() -- I think __pci_write_msi_msg() was the most significant, possibly because it produced the most log text) and (b) leave a 115200 baud UART kernel console running. (This is on a sample size of 20+ suspend cycles, whereas previous bisection would fail 100%.) It then reappers when I quiet the kernel logging a bit with `dmesg -n3`. I think that simply tells me that there's some timing issue or race condition involved. Brian