On Mon, Dec 09, 2019 at 12:34:04PM +0000, Nicholas Johnson wrote: > Hi, > > I have compiled Linux v5.5-rc1 and thought all was good until I > hot-removed a Gigabyte Aorus eGPU from Thunderbolt. The driver for the > GPU was not loaded (blacklisted) so the crash is nothing to do with the > GPU driver. > > We had: > - kernel NULL pointer dereference > - refcount_t: underflow; use-after-free. > > Attaching dmesg for now; will bisect and come back with results. Looks like something related to iommu. Does it work if you disable it? (intel_iommu=off in the command line).
