I got this on an alpha tonight.  It was under heavy load at the time
(18 simultaneous package builds had just been spawned on the machine).
Any ideas?

Slab at 0xfffffc00042d3fb8, freei 2 = 0.
panic: Duplicate free of item 0xfffffc00042d22e0 from zone 0xfffffc0007d31800(VMSPACE)

db_print_backtrace() at db_print_backtrace+0x18
panic() at panic+0x104
uma_dbg_free() at uma_dbg_free+0x170
uma_zfree_arg() at uma_zfree_arg+0x150
vmspace_free() at vmspace_free+0xe4
swapout_procs() at swapout_procs+0x428
vm_daemon() at vm_daemon+0x74
fork_exit() at fork_exit+0xe0
exception_return() at exception_return
--- root of call graph ---
panic
Stopped at      Debugger+0x34:  zapnot  v0,#0xf,v0      <v0=0x0>
db>

Kris

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