port-mac68k/48171: -current does not boot

[martin%NetBSD.org@localhost]

>Number:         48171
>Category:       port-mac68k
>Synopsis:       -current does not boot
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-mac68k-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Sep 01 11:30:00 +0000 2013
>Originator:     Martin Husemann
>Release:        NetBSD 6.99.23
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: mac68k
Architecture: m68k
Machine: mac68k
>Description:

Trying to boot a -current kernel dies in:

panic(1bfee6,3c,212d00,70e09c,70e504) + c       
trap(2a1e1c,8,505,1f212364) + 154        
callout_halt(1f212354,0,212280,212354,3c) + 18
sleepq_block(3c,0,212280,212280,1c11fa,21318c,70e09c,70e504) + c8
kpause(1c11fa,0,3c,0) + a6                                       
uvm_scheduler(70efb4,70e450,70efb4,204f0,15ef50) + 6c
main(1,103edc,650000,0,1000) + 7a8                   

within the first seconds after / has been mounted. The curlwp->l_timeout_ch
seems to be bogus, as the first argument to callout_halt() is not accessible
in ddb.

>How-To-Repeat:
Just try to boot.

>Fix:
No idea yet