Freeze

With GENERIC HEAD from Jan 18 19:27 UTC I got a freeze

~KDB: enter: Line break on console
[thread pid 14589 tid 100259 ]
Stopped at      kdb_enter+0x2b: nop
db> show pcpu
cpuid        = 0
curthread    = 0xc2139170: pid 14589 "swap"
curpcb       = 0xcf406da0
fpcurthread  = none
idlethread   = 0xc151f5c0: pid 11 "idle: cpu0"
APIC ID      = 0
currentldt   = 0x30
spin locks held:
db> where
Tracing pid 14589 tid 100259 td 0xc2139170
kdb_enter(c0845129) at kdb_enter+0x2b
siointr1(c1695400,c0953900,0,c0844f39,56f) at siointr1+0xce
siointr(c1695400) at siointr+0x21
intr_execute_handlers(c1510090,cf406d44,4,bfbfea58,c07a7b53) at intr_execute_handlers+0x9d
lapic_handle_intr(34) at lapic_handle_intr+0x2e
Xapic_isr1() at Xapic_isr1+0x33
--- interrupt, eip = 0x8048ef9, esp = 0xbfbfea40, ebp = 0xbfbfea58 ---
db> show alllocks
Process 14660 (sh) thread 0xc2817450 (101123)
exclusive sleep mutex process lock r = 0 (0xc1c58458) locked _at_ kern/kern_fork.c:300
exclusive sx allproc r = 0 (0xc08eb8a0) locked _at_ kern/kern_fork.c:287
shared sx proctree r = 0 (0xc08eb8e0) locked _at_ kern/kern_fork.c:278
Process 14580 (thr1) thread 0xc24db450 (100443)
exclusive sx user map r = 0 (0xc1ce4ad0) locked _at_ vm/vm_map.c:2994
Process 14573 (syscall) thread 0xc24e8450 (100493)
exclusive sx user map r = 0 (0xc253b4f4) locked _at_ vm/vm_glue.c:171
Process 2173 (top) thread 0xc17595c0 (100074)
exclusive sx sysctl lock r = 0 (0xc08ebe60) locked _at_ kern/kern_sysctl.c:1335
Process 2033 (cron) thread 0xc162a5c0 (100054)
shared sx proctree r = 0 (0xc08eb8e0) locked _at_ kern/kern_fork.c:278

More info at http://www.holm.cc/stress/log/cons109.html
-- 
Peter Holm