kern/45117: cpuctl nointr 0 freezes my box

[alnsn%NetBSD.org@localhost]

>Number:         45117
>Category:       kern
>Synopsis:       cpuctl nointr 0 freezes my box
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 04 20:10:08 +0000 2011
>Originator:     Alexander Nasonov
>Release:        5.99.54 amd64
>Organization:
home sweet home
>Environment:
NetBSD nebeda.localdomain 5.99.54 NetBSD 5.99.54 (GENERIC) #0: Sat Jul  2 
00:40:02 BST 2011  
root@nebeda.localdomain:/home/alnsn/src/netbsd-current/src/sys/arch/amd64/compile/obj/GENERIC
 amd64
>Description:
sudo cpuctl nointr 0 freezes my box.

[screen pts/2] cpuctl list
Num  HwId Unbound LWPs Interrupts Last change              #Intr
---- ---- ------------ ---------- ------------------------ -----
0    0    online       intr       Mon Jul  4 20:53:02 2011 9
1    1    online       intr       Mon Jul  4 20:53:02 2011 0
2    2    online       intr       Mon Jul  4 20:53:02 2011 0
3    3    online       intr       Mon Jul  4 20:53:02 2011 0

[screen pts/2] sudo cpuctl identify 0
cpu0: AMD Unknown AMD64 CPU (686-class), 2612.08 MHz, id 0x100f52
cpu0: features  0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features  0x178bfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2>
cpu0: features  0x178bfbff<HTT>
cpu0: features2 0x802009<SSE3,MONITOR,CX16,POPCNT>
cpu0: features3 0xefd3fbff<SYSCALL/SYSRET,NOX,MXX,FFXSR,P1GB,RDTSCP,LONG>
cpu0: features3 0xefd3fbff<3DNOW2,3DNOW>
cpu0: features4 0x37ff<LAHF,CMPLEGACY,SVM,EAPIC,ALTMOVCR0,LZCNT,SSE4A>
cpu0: features4 0x37ff<MISALIGNSSE,3DNOWPREFETCH,OSVW,IBS,SKINIT,WDT>
cpu0: "AMD Athlon(tm) II X4 620 Processor"
cpu0: I-cache 64KB 64B/line 2-way, D-cache 64KB 64B/line 2-way
cpu0: L2 cache 512KB 64B/line 16-way
cpu0: ITLB 32 4KB entries fully associative, 16 4MB entries fully associative
cpu0: DTLB 48 4KB entries fully associative, 48 4MB entries fully associative
cpu0: Initial APIC ID 0
cpu0: AMD Power Management features: 0x1f9<TS,TTP,HTC,STC,100,HWP,TSC>
cpu0: SVM Rev. 1
cpu0: SVM NASID 64
cpu0: SVM features 0xf<NP,LbrVirt,SVML,NRIPS>
cpu0: family 0f model 05 extfamily 01 extmodel 00
>How-To-Repeat:
sudo cpuctl nointr 0 on SMP system.
>Fix:
Not known