alpha kernel hang at boot

[Nicolas Joly <njoly%pasteur.fr@localhost>]

Hi,

I cannot boot my PWS500au machine with a recent kernel anymore ... It
hangs at some point.

1) Very early for LOCKDEBUG one :

Boot flags: a
10999040+362280 [571584+383281]=0xbbf620

Entering netbsd at 0xfffffc0000431230...
[...HANG HERE...]

2) Much later without LOCKDEBUG :

Entering netbsd at 0xfffffc0000431230...
consinit: not using prom console
Copyright (c) 1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,
[...]
cd0 at atapibus0 drive 0: <CD-ROM CDU611,,2.0a> cdrom removable
fd0 at fdc0 drive 0: 1.44MB,80 cyl,2 head,18 sec
stray isa irq 14
stray isa irq 14
root on wd0a dumps on wd0b
root file system type: ffs
[...HANG HERE...]

There i can enter ddb and get the following backtrace :

db> bt
cpu_Debugger() at netbsd:cpu_Debugger+0x4
comintr() at netbsd:comintr+0x79c
alpha_shared_intr_dispatch() at netbsd:alpha_shared_intr_dispatch+0x5c
sio_iointr() at netbsd:sio_iointr+0x4c
interrupt() at netbsd:interrupt+0x24c
XentInt() at netbsd:XentInt+0x1c
--- interrupt (from ipl 0) ---
rw_enter() at netbsd:rw_enter+0x154
vm_map_lock_read() at netbsd:vm_map_lock_read+0x38
uvm_fault_internal() at netbsd:uvm_fault_internal+0xe8
trap() at netbsd:trap+0x5e8
XentMM() at netbsd:XentMM+0x20
--- memory management fault ---

This seems to be related to recent kmem/vmem changes ... an old
5.99.60 version does show any problem.

Any idea ?

Thanks.

-- 
Nicolas Joly

Projects and Developments in Bioinformatics
Institut Pasteur, Paris.