uvm_fault(fffffd806c098ad0,400000000000,0,2) at uvm_fault+0x272
upageflttrap(ffff80002a45e0d0,400000000100) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
usertrap(ffff80002a45e0d0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x6ff3d7419020, 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: 0x759c42248170, count: 14
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x759c42248170, count: -1