+ Adding tglx as he's involved in reviewing that commit. Context: https://lore.kernel.org/linux-pci/aJXYhfc%2F6DfcqfqF@xxxxxxxxxxxxxxxxx/ On Fri, Aug 08, 2025 at 08:07:03PM +0200, Nam Cao wrote: > There is no point in bisecting before that commit, because the WARN_ON() > is added by that commit, so you wouldn't see anything before that. I didn't notice that. Good you pointed that out earlier. > The WARN_ONCE() tells us that some devices down the PCI tree are > allocating MSI, but VMD supports MSI-X only. > > From the backtrace: > msi_create_device_irq_domain+0x1eb/0x290 > __pci_enable_msi_range+0x106/0x300 > pci_alloc_irq_vectors_affinity+0xc5/0x110 > pcie_portdrv_probe+0x24e/0x610 > > It seems MSI-X are allocated first, but fail for some reason. Then > fallback to MSI, which triggers the WARN_ON(). > > So we need to figure out why MSI-X allocation fail. > > I may need to ask you to insert a bunch of printk() to help me pinpoint > the problem. But let me stare at it first.. I can do that. Send me a git diff. I'll test it and back with the dmesg output. -- Ammar Faizi
