Page fault in kern/kern_event.c:1451

With GENERIC HEAD from Jan 8 08:45 UTC I got:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x1c
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc060a9d0
stack pointer           = 0x10:0xcf26ec74
frame pointer           = 0x10:0xcf26ec80
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1130 (syscall)
[thread pid 1130 tid 100213 ]
Stopped at      _mtx_assert+0x38:       movl    0x1c(%ebx),%eax
db> where
Tracing pid 1130 tid 100213 td 0xc1dcd450
_mtx_assert(0,1,c082984d,5ab,c24b489c) at _mtx_assert+0x38
knote(c24b489c,0,1) at knote+0x2a
pipeclose(c2462b00,cf26ed40,0,c1dcd450,0) at pipeclose+0x3a3
pipe(c1dcd450,cf26ed14,0,3,292) at pipe+0x50
syscall(2f,2f,2f,896a2df3,5d28afd2) at syscall+0x128
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (42, FreeBSD ELF32, pipe), eip = 0x2809a5c9, esp = 0xbfbfeab0, ebp = 0xbfbfeae8 ---

Details at http://www.holm.cc/stress/log/cons103.html

This seems to be a duplicate of:
http://www.holm.cc/stress/log/cons95.html
http://www.holm.cc/stress/log/cons87.html
-- 
Peter Holm