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uvm_pagelookup panic, no bt

Just had this panic on -current/amd64, but it doesn't make for much
of a bug report:

Crash version 10.99.2, image version 10.99.2.
crash: _kvm_kvatop(0)
Kernel compiled without options LOCKDEBUG.
System panicked: kernel diagnostic assertion "uvm_pagelookup(&aobj->u_obj, (UAO_SWHASH_ELT_PAGEIDX_BASE(elt) + j) << PAGE_SHIFT) == NULL" failed: file "../../../../uvm/uvm_aobj.c", line 1364 
Backtrace from time of crash is available.
crash> bt
end() at 0
crash: _kvm_kvatop(ffffb610cec18aa8)
crash: kvm_read(0xffffb610cec18aa8, 8): could not read PT level 3 entry: Invalid argument

I'll try running with LOCKDEBUG for a bit...



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