On Mon, Sep 30, 2024 at 11:27:28AM +0800, AceLan Kao wrote: > Lukas Wunner <lukas@xxxxxxxxx> 2024 9 27 5:28 > > there is a known issue > > that a deadlock may occur when hot-removing nested PCIe switches (which is > > what you've got here). Keith Busch recently re-discovered the issue. > > You may want to try if the hang goes away if you apply this patch: > > > > https://lore.kernel.org/all/20240612181625.3604512-2-kbusch@xxxxxxxx/ > > > > If it does go away then at least we know what the root cause is. > > Yes, the 2 patches work. Okay so you can't reproduce the issue with those patches? That would mean 9d573d19547b ("PCI: pciehp: Detect device replacement during system sleep") isn't the culprit, whew! > > The patch is a bit hackish, but there's an ongoing effort to tackle the > > problem more thoroughly: > > > > https://lore.kernel.org/all/20240722151936.1452299-1-kbusch@xxxxxxxx/ > > https://lore.kernel.org/all/20240827192826.710031-1-kbusch@xxxxxxxx/ > > v2 can't be applied clearly, so I made some changes. > And this series doesn't work for me. Okay, I'll look at those patches separately. Thanks, Lukas
