> On Sep 1, 2023, at 5:33 PM, Brett Lymn <bl...@internode.on.net> wrote: > > On Thu, Aug 31, 2023 at 09:02:53PM -0600, Brook Milligan wrote: >> >> However, a write fails and hangs the board hard: no keyboard response, no >> response to pings. I have attached the test program below, and would >> appreciate more eyes on it from (the many) people who obviously know serial >> line programming better than I do. It gets as far as the write() call, but >> no further. >> > > This sounds like a driver bug. In no circumstances should a user land > program be able to > hang a machine. I would log a kernel PR with your sample code attached. > > I may be helpful if you can get into ddb and get a backtrace there.
I’ll try that. However, I have little experience with kernel ddb. Where should I be looking for how to do this and what information should be be logging? If I were in ddb and the machine hung, would I be able to get a backtrace? Cheers, Brook
