kern/41013: netbsd5-rc2 crash

[6bone%6bone.informatik.uni-leipzig.de@localhost]

>Number:         41013
>Category:       kern
>Synopsis:       netbsd5-rc2 crash
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 14 10:15:00 +0000 2009
>Originator:     Uwe Toenjes
>Release:        netbsd-5-rc2
>Organization:
University of Leipzig
>Environment:
netbsd-5-rc2 amd64
>Description:
at high disk load the following error occurs nearly every day

panic: WARNING: SPL NOT LOWERED ON TRAP EXIT 6 0                                
kernel diagnostic assertion "vp->v_usecount == 1" failed: file "/usr/src/sys/ke0
                                                                                
WARNING: SPL NOT LOWERED ON SYSCALL 1 -11008 EXIT ffe00000 7                    
fatal breakpoint trapWARNING: SPL NOT LOWERED ON SYSCALL 1 -10352 EXIT ffe000007
 in supervisor mode                                                             
WARNING: SPL NOT LOWERED ON SYSCALL 1 16 EXIT ffffda6c 7                        
trap type 1 code 0 rip ffffffff80535105 cs 8 rflags 246 cr2  7f7ffd6ed040 cpl 00
SWtARoNppINeGd:  inS PLp idNO 1T 94L5O2W.ER1 E(D fOiNn dS) YaStCA L  L  1  7   7
0x5:  leave                                                                    +
db{3}> 
trace
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x24d
__kernassert() at netbsd:__kernassert+0x2d
getnewvnode() at netbsd:getnewvnode+0x2a0
ffs_vget() at netbsd:ffs_vget+0x49
ufs_lookup() at netbsd:ufs_lookup+0x7c3
VOP_LOOKUP() at netbsd:VOP_LOOKUP+0x80
lookup() at netbsd:lookup+0x34b
namei() at netbsd:namei+0x1a4
do_sys_stat() at netbsd:do_sys_stat+0x44
sys___lstat30() at netbsd:sys___lstat30+0x2a
syscall() at netbsd:syscall+0xb6
db{3}> show registers
ds          0x6b0
es          0x10
fs          0x660
gs          0x87
rdi         0
rsi         0x3f8
rbp         0xffff800125a106a0
rbx         0xffff800125a106b0
rdx         0x8
rcx         0
rax         0x1
r8          0xffffffff80a0b78a  copyright+0x8adaa
r9          0x1
r10         0xffff800125a105a0
r11         0x8
r12         0x104
r13         0xffffffff80a19220  copyright+0x98840
r14         0xffff800125a10818
r15         0x1
rip         0xffffffff80535105  breakpoint+0x5
cs          0x8
rflags      0x246
rsp         0xffff800125a106a0
ss          0x10
netbsd:breakpoint+0x5:  leave

>How-To-Repeat:

>Fix: