Hi Jesse, On Wed, Mar 13, 2019 at 11:50:07AM -0500, Jesse Hathaway wrote: > Two regressions cause Linux to hang on boot when a Comtrol PCI card > is present. > > If I revert the following two commits, I can boot again and the card > operates without issue: > > 1302fcf0d03e (refs/bisect/bad) PCI: Configure *all* devices, not just > hot-added ones > 1c3c5eab1715 sched/core: Enable might_sleep() and smp_processor_id() > checks early I'm very sorry about the regression, but thank you very much for narrowing it down and reporting it! How did you narrow it down to *two* commits, and do you have to revert both of them to avoid the hang? Usually a bisection identifies a single commit, and the two you mention aren't related. > ; lspci -vs 82:00.0 > 82:00.0 Multiport serial controller: Comtrol Corporation Device 0061 > Subsystem: Comtrol Corporation Device 0061 > Flags: 66MHz, medium devsel, IRQ 35, NUMA node 1 > Memory at c8004000 (32-bit, non-prefetchable) [size=4K] > Memory at c8000000 (32-bit, non-prefetchable) [size=16K] > Capabilities: [40] Hot-plug capable > Capabilities: [48] Power Management version 2 > Kernel driver in use: rp2 > Kernel modules: rp2 > > Is it possible that the problem is that the card claims to support > Hot-plug, but does not? > > I would love to help fix this issue, please let me know what other > information would be helpful to provide. Can you collect a complete dmesg log (with a working kernel) and output of "sudo lspci -vvxxx"? You can open a bug report at https://bugzilla.kernel.org, attach the logs there, and respond here with the URL. Where does the hang happen? Is it when we configure the Comtrol card? Bjorn
