Re: Dom0: machine hang with cpuctl

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Jun 02, 2008 at 11:37:25PM +0200, Christoph Egger wrote:
> 
> Hi!
> 
> 
> In a amd64 Dom0 (4.99.64), "cpuctl identify 0" works fine on VGA.
> In a ssh session on that machine, the same command makes the machine 
> hang - the command itself does not run and there's no reaction on the shell.
> 
> 
> With a GENERIC kernel, "cpuctl identify 0" works both on VGA and
> (ssh) remote.
> 
> 
> When the machine hangs, I can ping the machine, I can break into ddb
> on VGA. Things I type on VGA don't appear on the display. But in ddb,
> the keyboard works normally.
> 
> A backtrace in ddb is always the same:
> 
> wskbd_translate() at netbsd:wskbd_translate+0xb1e
> wskbd_input() at netbsd:wskbd_input+0xc6
> pckbd_input() at netbsd:pckbd_input+0x54
> pckbcintr() at netbsd:pckbcintr+0x81
> Xresume_xenev6() at netbsd:Xresume_xenevt+0x55
> --- interrupt ---
> Xspllower() at netbsd:Xspllower+0xe
> idle_loop() at netbsd:idle_loop+0x86
> 
> 
> Can anyone reproduce this?

I can. It seems related to CPU binding: if I run cpuctl identify as non-root,
it works. Running it as root from the serial console work too.

-- 
Manuel Bouyer, LIP6, Universite Paris VI.           
Manuel.Bouyer%lip6.fr@localhost
     NetBSD: 26 ans d'experience feront toujours la difference
--