Hi,

On Mon, Dec 10, 2007 at 05:07:45PM +0100, Kurt Schreiner wrote:

> on my dual opteron system a kernel compiled from fresh -current
> sources hangs during "build.sh ... -j8 ... distribution".
> Breaking to "db>" yields:

I have been able to complete a couple of builds with GENERIC.MP, so I am not
able to reproduce the problem.

> Mon Dec 10 16:39:01 MET 2007
> 
> NetBSD/amd64 (isunopti) (console)
> 
> login: Stopped in pid 0.2 (system) at  netbsd:breakpoint+0x1:  ret
> db{0}> bt
> breakpoint() at netbsd:breakpoint+0x1
> Xintr_ioapic_edge4() at netbsd:Xintr_ioapic_edge4+0xd8
> --- interrupt ---
> _kernel_lock() at netbsd:_kernel_lock+0xe3
> intr_biglock_wrapper() at netbsd:intr_biglock_wrapper+0x18
> Xintr_ioapic_level18() at netbsd:Xintr_ioapic_level18+0xe0
> --- interrupt ---
> _kernel_lock() at netbsd:_kernel_lock+0xe3
> trap() at netbsd:trap+0x769

It seems to be deadlocked, waiting on the other CPU to release kernel_lock.
Could you please switch onto the second CPU with "mach cpu 1" and get a
backtrace from there?

Thanks,
Andrew