On Sun, Nov 20, 2022 at 12:44:36AM -0300, Josmar Pierri wrote: > Hi, > > I discovered that neither of my keyboards are capable of sending > keystrokes to ddb after a kernel panic. > > Here is what I know so far: > > 1 - It randomly happens under 7.2 on two different Dell R440 servers, > and also happened the same way when they were running 7.1 > > 2 - It also happens on my old Dell desktop that now is running the > latest 7.2 snapshot (GENERIC.MP#845 from today) > > 3 - As said by man ddb, CTRL ALT ESC and CTRL ALT DEL should bring ddb > up when machdep.kbdreset=2 and ddb.console=1 but, with my USB > keyboards, nothing happens pressing them. > > 4 - When I set ddb.trigger=1 the ddb appears as expected, however I > can't type anything on it. No keys from my USB keyboards are accepted. > > 5 - Unfortunately there is no PS/2 keyboard connector or serial port > on any of these machines. > > I'm stuck. > Could someone please tell me what I'm missing?
Try machdep.forceukbd=1. This sysctl exists on amd64 and i386 and should let you use a USB keyboard with ddb. Otherwise see crash(8). With ddb.panic=0 the state can be saved to disk without needing keyboard interaction, and can be examined later.
