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Wed, 02 Jul 2025 23:35:59 -0700 (PDT) Date: Thu, 3 Jul 2025 12:05:51 +0530 From: Sunil V L To: Shuan He Cc: bhelgaas@google.com, cuiyunhui@bytedance.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC 0/1] PCI: Fix pci devices double register WARNING in the kernel starting process Message-ID: References: <20250702155112.40124-1-heshuan@bytedance.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: <20250702155112.40124-1-heshuan@bytedance.com> On Wed, Jul 02, 2025 at 11:51:11PM +0800, Shuan He wrote: > Hi All. > I encountered a WARNING printed out during the kernel starting process > on my developing environment. > (with RISC-V arch, 6.12 kernel, and Debian 13 OS). > > WARN Trace: > [ 0.518993] proc_dir_entry '000c:00/00.0' already registered > [ 0.519187] WARNING: CPU: 2 PID: 179 at fs/proc/generic.c:375 proc_register+0xf6/0x180 > [ 0.519214] [] proc_register+0xf6/0x180 > [ 0.519217] [] proc_create_data+0x3e/0x60 > [ 0.519220] [] pci_proc_attach_device+0x74/0x130 > [ 0.509991] [] pci_bus_add_device+0x42/0x100 > [ 0.509997] [] pci_bus_add_devices+0xc6/0x110 > [ 0.519230] [] acpi_pci_root_add+0x54c/0x810 > [ 0.519233] [] acpi_bus_attach+0x196/0x2f0 > [ 0.519234] [] acpi_scan_clear_dep_fn+0x30/0x70 > [ 0.519236] [] process_one_work+0x19a/0x390 > [ 0.519239] [] worker_thread+0x2be/0x420 > [ 0.519241] [] kthread+0xc4/0xf0 > [ 0.519243] [] ret_from_fork+0xe/0x1c > This should not happen. I suspect some issue in ACPI namespace/_PRT. Can you reproduce this on qemu virt machine? Regards Sunil