amd64 current kernel crashes w/ rw_vector_enter: locking against myself

[Kurt Schreiner <ks%ub.uni-mainz.de@localhost>]

Hi,

trying to boot a kernel compiled from -current sources cvs updated
Aug 19 20:57 MEST results in an early crash. Doesn't matter if I
try booting a GENERIC kernel (as shown below) or a customized one.
This is on a Sun Ultra24 w/ an Intel Q6600 and 8GB Ram...

Kurt


rebooting...
:-(
>> NetBSD/x86 BIOS Boot, Revision 5.2 (from NetBSD 5.99.01)
>> Memory: 635/3406144 k

     1. Boot normally
     2. Boot single user
     3. Disable ACPI
     4. Disable ACPI and SMP
     5. Drop to boot prompt

Choose an option; RETURN for default; SPACE to stop countdown.
Option 1 will be chosen in 0

Option: [1]:5
type "?" or "help" for help.
> boot netbsd.gen_090819
booting hd0a:netbsd.gen_090819
10721024+543680+722240 [764040+501597]=0xda48e8
Reader / writer lock error: rw_vector_enter: locking against myself

lock address : 0xffffffff80d0d368
current cpu  :                  0
current lwp  : 0xffffffff80c9c940
owner/count  : 0xffffffff80c9c940 flags    : 0x0000000000000004

panic: lock error
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff8022dda5 cs 8 rflags 246 cr2  ffff80000f6dcf8c 
cpl 8 rsp ffffffff80ea8710
Stopped in pid 0.1 (system) at  netbsd:breakpoint+0x5:  leave
db{0}> bt
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x29a
lockdebug_abort() at netbsd:lockdebug_abort+0x3a
rw_vector_enter() at netbsd:rw_vector_enter+0x25b
uvm_fault_internal() at netbsd:uvm_fault_internal+0xc9
trap() at netbsd:trap+0x68e
--- trap (number 0) ---
0:
db{0}> bt
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x29a
lockdebug_abort() at netbsd:lockdebug_abort+0x3a
rw_vector_enter() at netbsd:rw_vector_enter+0x25b
uvm_fault_internal() at netbsd:uvm_fault_internal+0xc9
trap() at netbsd:trap+0x68e
--- trap (number 0) ---
0:
db{0}>