uvm_fault(fffffd806bfc9200,200000001000,0,2) at uvm_fault+0x278 sys/uvm/uvm_fault.c:-1
upageflttrap(ffff80002a32e9f0,200000001cc0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80002a32e9f0) at usertrap+0x403 sys/arch/amd64/amd64/trap.c:605
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x70be810d2d10, count: -22
ddb{0}> machine ddbcpu 1
Stopped at      savectx+0xae:   movl    $0,%gs:0x688
savectx() at savectx+0xae
end of kernel
end trace frame: 0x756c0faeb7f0, count: 14
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x756c0faeb7f0, count: -1