uvm_fault(fffffd806890b378,b94f063000,0,4) at uvm_fault+0x255 sys/uvm/uvm_fault.c:637
upageflttrap(ffff800033f40640,b94f063d6b) at upageflttrap+0x8b sys/arch/amd64/amd64/trap.c:188
usertrap(ffff800033f40640) at usertrap+0x227 sys/arch/amd64/amd64/trap.c:436
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7275595db810, count: -21
ddb{0}> machine ddbcpu 1
Stopped at      proc_trampoline+0xc7:   movl    $0,%gs:0x660
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x7275595db600, count: 14
ddb{1}> trace
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x7275595db600, count: -1