On Thu, 8 Nov 2018 11:10:29 +0800 Jeff Guo <jia....@intel.com> wrote:
> hi, stephen > > On 11/8/2018 3:33 AM, Stephen Hemminger wrote: > > On Wed, 7 Nov 2018 17:41:31 +0800 > > Jeff Guo <jia....@intel.com> wrote: > > > >> When device is hot-unplugged, the device fd will be deleted in kernel. > >> Then in the progress of detaching device, if it try to close the fd, > >> it will cause a kernel crash, which shown a kernel null pointer error. > > If this happens, then it is a kernel bug and the kernel should be fixed. > > Working around it in userspace is not a great long term solution. > > > agree with you. The key is sometime hold by kernel. But i think it is at > least reasonable for avoiding no-use process in user space, whatever > kernel's behavior. I am not sure if there is any better idea we can > find, but seems it is an option now. Are you using igb_uio? If so the problem is an DPDK supplied driver. Let's fix that. What is the backtrace on kernel crash.
