Most of these patches are a result of syz-kaller runs. With these patches I get a significant reduction in fail, but we're not there yet. There is at least one known issue with unthrottling events (if only it wouldn't not go into hiding whenever I add more debug code), and there are a number of NMI watchdog triggers that so far make little sense.
There's a number of patches I'm not really confident in, so please have a hard look at all of them.
