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kern/42621: "lockdebug_lookup: uninitialized lock" panic

>Number:         42621
>Category:       kern
>Synopsis:       "lockdebug_lookup: uninitialized lock" panic
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 15 05:40:00 +0000 2010
>Originator:     Ryo HAYASAKA
>Release:        NetBSD 5.99.23
Japan Advanced Institute of Science and Technology (JAIST)
System: NetBSD 5.99.23 NetBSD 5.99.23 (GENERIC) #7: Thu Jan 
14 15:08:45 JST 2010 i386
Architecture: i386
Machine: i386
While compiling pkgsrc/fonts/ec-fonts-mftraced, my system gets panic:

#0  cpu_reboot (howto=260, bootstr=0x0)
    at /c/ryoh/src/sys/arch/i386/i386/machdep.c:861
#1  0xc05d6854 in panic (
    fmt=0xc09cf0e8 "lockdebug_lookup: uninitialized lock (lock=%p, from=%08x)")
    at /c/ryoh/src/sys/kern/subr_prf.c:299
#2  0xc05cf61f in lockdebug_wantlock (lock=0xc25a97b0, where=3226615849,
    shared=false, trylock=false) at /c/ryoh/src/sys/kern/subr_lockdebug.c:193
#3  0xc0478eb7 in mutex_vector_enter (mtx=0xc25a97b0)
    at /c/ryoh/src/sys/kern/kern_mutex.c:503
#4  0xc0524029 in pmap_enter (pmap=0xd48244e4, va=3147022336, pa=1498042368,
    prot=3, flags=<value optimized out>)
    at /c/ryoh/src/sys/arch/x86/x86/pmap.c:4184
#5  0xc0686524 in uvm_fault_internal (orig_map=0xce051428, vaddr=3147022336,
    access_type=<value optimized out>, fault_flag=0)
    at /c/ryoh/src/sys/uvm/uvm_fault.c:1766
#6  0xc060e2a3 in trap (frame=0xcf74fd48)
    at /c/ryoh/src/sys/arch/i386/i386/trap.c:671
#7  0xc010cc86 in calltrap ()

The kernel and core of the system are available:

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