uvm_fault(fffffd8062fd5030,200000001000,0,2) at uvm_fault+0x272 sys/uvm/uvm_fault.c:-1
upageflttrap(ffff80002a4205f0,200000001280) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
usertrap(ffff80002a4205f0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x763b0edbbd10, count: -21
ddb{0}> machine ddbcpu 1
Stopped at      savectx+0xae:   movl    $0,%gs:0x680
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7d705f8c540, count: 14
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7d705f8c540, count: -1