Anyone else seen this recently?

panic: kernel diagnostic assertion "pcg->pcg_avail != 0" failed: file
"../../../../kern/subr_pool.c", line 1692

Stopped in pid 5 (pagedaemon) at        cpu_Debugger+0x4:       ret
zero,(ra
)
db> t
cpu_Debugger() at cpu_Debugger+0x4
panic() at panic+0x15c
__assert() at __assert+0x34
pool_cache_do_invalidate() at pool_cache_do_invalidate+0xa8
pool_cache_reclaim() at pool_cache_reclaim+0x1c
pool_reclaim() at pool_reclaim+0x58
pool_drain() at pool_drain+0x90
uvm_pageout() at uvm_pageout+0x164
esigcode() at esigcode

-matt