uvm_fault(fffffd80503ae8a8,20000000,0,2) at uvm_fault+0x112 sys/uvm/uvm_fault.c:600
kpageflttrap(ffff800030dc5ec0,200001f8) at kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279
kerntrap(ffff800030dc5ec0) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x62
kern_sysctl(ffff800030dc6244,5,20000100,ffff800030dc6278,0,37,b9d83271658399cf) at kern_sysctl+0x320 sys/kern/kern_sysctl.c:500
sys_sysctl(ffff80003259d6e8,ffff800030dc63b0,ffff800030dc6300) at sys_sysctl+0x422
syscall(ffff800030dc63b0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff800030dc63b0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x93b9ab55e80, count: -23
ddb{0}> machine ddbcpu 1
Stopped at      savectx+0xae:   movl    $0,%gs:0x680
savectx() at savectx+0xae
end of kernel
end trace frame: 0x93ba5071960, count: 14
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x93ba5071960, count: -1