On 28/08/18(Tue) 22:22, Tom Murphy wrote: > On Tue, Aug 28, 2018 at 04:20:41PM -0300, Martin Pieuchot wrote: > > Hello Tom, > > > > On 28/08/18(Tue) 11:10, Tom Murphy wrote: > > > On Tue, Aug 28, 2018 at 02:49:38PM +0900, Bryan Linton wrote: > > > > On 2018-08-25 21:40:57, Tom Murphy <[email protected]> wrote: > > > > > On Thu, Aug 23, 2018 at 08:45:54PM +0900, Tom Murphy wrote: > > > > > > I've narrowed it down. > > > > > > > > > > > >Last kernel where adb works: June 24 09:59:46 MDT 2018 > > > > > >1st Kernel where adb panics: June 25 13:10:32 MDT 2018 > > > > The real problem is in the xhci(4) driver. When a command with a > > timeout is submitted we should ensure no other command is enqueued > > before continuing. Sadly the driver did not include any mechanism > > to serialize command submissions. Diff below does that and should > > fix your problem. > > > > Can you try it on top of -current? Make sure you have no diff > > reverted. > > Hi, > > I think I spoke a little too soon. I found a case where it > started printing xhci0: command timeout over and over until > eventually the kernel panics with a protection fault. I couldn't > catch the backtrace properly, but it looked around the same area > as this original bug report.
Without backtrace I can't make progress.
