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Date: Mon, 21 Apr 2003 20:56:45 -0400 (EDT)
From: Daniel Eischen <eischen@pcnet1.pcnet.com>
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David,

I was able to get this panic running my test program 
(thread_test2.c posted earlier) with 10 scope system
threads.  Sometimes you can get it with 4 or 5.

[ copied by hand ]

panic: blockable sleep lock (sleep mutex) Giant@vm_fault.c:210
Debugger(c04018dc) at Debugger+0x45

db>trace
panic(c0404cc, c0414ba0, c04010e4, c0414670, d2) at panic+0x9f
witness_lock(c0490d20, 8, c0414670, d2, 2) at witness_lock+0x92
_mtx_lock_flags(c0490d20, 0, c0414670, d2) at _mtx_lock_flags+0x7f
vm_fault(c082f000, d0d10000, 2, 0, c1c55720) at vm_fault+0x4a
trap_pfault(cc9b7bf4, 0, d0d1d48) at trap_pfault+0x111
trap(c02a0018, 10, 10, d0d1d48, cc9b7d48) at trap+0x379
calltrap() at calltrap+0x5
--- trap 0xc, eip = 0xc03b001a, esp = 0xcc96734m ebp = 0xcc9b7cbc ---
generic_bcopy(c1c55720, c1f97210) at generic_bcopy+0x1a
kse_create(c1c55720, cc9b7d14, 2, 1, 286) at kse_create+0x277
syscall(2f, 2f, 2f, 804d000, 807c000) at syscall+0x1f1
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall(381, FreeBSD ELF32, kse_create), eip = 0x280cc17f, esp = 0xbfbff9cc, ebp = 0xbfbffaf8

-- 
Dan Eischen