On Mon, May 11, 2020 at 11:13:15PM -0400, Dennis Dalessandro wrote: > From: Kaike Wan <kaike.wan@xxxxxxxxx> > > The workqueue hfi1_wq is destroyed in function shutdown_device(), which > is called by either shutdown_one() or remove_one(). The function > shutdown_one() is called when the kernel is rebooted while remove_one() > is called when the hfi1 driver is unloaded. When the kernel is rebooted, > hfi1_wq is destroyed while all qps are still active, leading to a > kernel crash: AFAIK the purpose of shutdown is to stop all in progress DMAs. If devices are wildly doing DMA during the shutdown process then all manner of things can fail, including kexecing into another kernel. Do you achive that with these shutdown handlers? It does make sense that the work queue would not be destroyed in shutdown, but I'm surprised it doesn't flush it? Jason
