On Sun, 26 Dec 2004 23:34:25 -0500 (EST) Alan Stern wrote: > On Sun, 26 Dec 2004, David Relson wrote: > > > Hi Alan, > > > > Alt-SysRq-T output attached :-) Hopefully I extracted the relevant > > part. > > You didn't include the entry for khubd, but I'm not sure that it would > contain anything useful. The trace doesn't point clearly to any specific > cause, although it does indicate that the SCSI error handler task was > running, which means that something went wrong somewhere. At this point > the best thing would be to get a usb-storage verbose debugging log. > > > I'm just barely aware of Alt-SysRq ... After dumping the stack, I went > > into emacs and type ctl-x ctl-f (if I recall correctly) and my machine > > shutdown. I assume that's an effect of "sysrq mode". How do I turn the > > mode back off? > > Well, your machine certainly isn't supposed to crash like that! Normally > "sysrq mode" turns off when you release the SysRq key. The actual > sequence of keystrokes you're supposed to use is a little obscure; it goes > like this: > > Press Alt > Press SysRq > Release Alt > While still holding SysRq, press & release any sequence of > code letters (H for help, T for trace, etc.) > Release SysRq > > Also, it's probably a good idea to be at a normal console (not an X11 > screen) when you do this. > > Alan Stern]
Attached is the khubd output. Indeed I was in an X session and was simultaneously pressing the three keys, Alt, SysRq, and T. I'd characterize what happened afterwards as "an immediate shutdown". I've been building kernels all afternoon, but they've all had problems booting, i.e. "kernelpanic - not syncing: VFS: Unable to mount root fs on unknown-block 3,1" and I've got a query on the Mandrake list to find out what's happening. Cheers! David
sysrq.khubd
Description: Binary data
