On Thu, 2019-01-17 at 10:42 +0100, Tobias Ulmer wrote: > On Wed, Jan 16, 2019 at 12:15:14PM +1100, Benjamin Herrenschmidt wrote: > > On Tue, 2019-01-15 at 23:49 +0100, Tobias Ulmer wrote: > > > Hi, > > > > > > both the latest stable 4.20.2 and 5.0 rc2+ hang early on the G5 Quad. > > > > > > Surely I'm not the first to run into this, but I couldn't find any > > > discussion or bug report. Sorry if you're already aware. > > > > > > You can see it hang here (5.0 rc2+, 4.20.2 is nearly identical) until > > > the watchdog triggers a reboot: > > > > > > https://i.imgur.com/UiCVRuG.jpg > > > > > > If I had to make an uneducated guess, it seems to boot into the same > > > codepath twice (mpic was already initialized, then it starts again right > > > after smp bringup). Maybe on a second CPU? > > > > > > To narrow it down a little, my last known good was 4.18.9 > > > > I don't think it's an MPIC related problem but it does appear to hang > > about when interrupts get turned on. > > When they get turned on for the second time, for some reason. You can see the > end of the first time just on top of the screen.
No, that top of screen init is something else. > It repeats part of the startup initialization right after it's done with > smp bringup. That's just the BootX console hanging over to the main console and replaying the messages I think. > > I have one of these critters in the office, but I'm working remotely > > this week so I won't be able to dig into this until next week. > > > > It might help if you could bisect in the meantime. > > I'm bisecting it now, but it's slow going since I don't have much time > to babysit the machine. The problem shows up somewhere between v4.19 and > v4.20. Ok, thanks. I'll be back on monday or tuesday, let me know where you got up to then and I'll take it from there. Also email me your .config please. Cheers, Ben. > > Cheers, > > Ben. > > > >
