panic in single user boot after make buildworld, buildkernel, installkernel

[Anton Shterenlikht]

I just updated src on blade 1500,
made buildworld, buildkernel, installkernel,
no problem there. 

On reboot in single user mode I get this panic:

uart0: console (9600,n,8,1)
uart1: <16550 or compatible> at port 0x2e8-0x2ef irq 44 on isa0
uart1: [FILTER]
Timecounter "tick" frequency 1503000000 Hz quality 1000
Timecounters tick every 1.000 msec
IP Filter: v4.1.28 initialized.  Default = block all, Logging = enabled
usbus0: 12Mbps Full Speed USB v1.0
panic: blockable sleep lock (sleep mutex) system map @ /usr/src/sys/vm/vm_map.c:3532
KDB: enter: panic
[thread pid 11 tid 100027 ]
Stopped at      kdb_enter+0x80: ta              %xcc, 1
db> 
db> bt
Tracing pid 11 tid 100027 td 0xfffff80002110000
panic() at panic+0x158
witness_checkorder() at witness_checkorder+0x108
_mtx_lock_flags() at _mtx_lock_flags+0x110
_vm_map_lock_read() at _vm_map_lock_read+0x1c
vm_map_lookup() at vm_map_lookup+0x4c
vm_fault() at vm_fault+0x70
trap_pfault() at trap_pfault+0x338
trap() at trap+0x354
-- fast data access mmu miss tar=0xdeadc000 %o7=0xc02276dc --
_thread_lock_flags() at _thread_lock_flags+0x240
sleepq_signal() at sleepq_signal+0x1a4
cv_signal() at cv_signal+0x2c
_sema_post() at _sema_post+0x50
ata_completed() at ata_completed+0xad4
ata_finish() at ata_finish+0x58
ata_interrupt() at ata_interrupt+0x13c
ata_generic_intr() at ata_generic_intr+0x18
intr_event_execute_handlers() at intr_event_execute_handlers+0x150
ithread_loop() at ithread_loop+0xf8
fork_exit() at fork_exit+0x9c
fork_trampoline() at fork_trampoline+0x8
db>     

Please advise

many thanks
anton


-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 331 5944
Fax: +44 (0)117 929 4423