kernel: protection fault trap, code=0
Stopped at      malloc+0x855:   movq    0x8(%rbx),%r14
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> show kasan
No such command
ddb> trace
malloc(10,62,2) at malloc+0x855 sys/kern/kern_malloc.c:293
amap_alloc1(20,2,0) at amap_alloc1+0x293 sys/uvm/uvm_amap.c:356
amap_alloc(20000,2,0) at amap_alloc+0xad sys/uvm/uvm_amap.c:-1
amap_copy(fffffc8072ecd5c8,fffffc806cafd6e0,2,0,3b40d1c8000,3b40d1c8001) at amap_copy+0x6a8 sys/uvm/uvm_amap.c:570
uvm_fault_check(ffff80002f4b8de0,ffff80002f4b8e18,ffff80002f4b8e50,0) at uvm_fault_check+0x457 sys/uvm/uvm_fault.c:747
uvm_fault(fffffc8072ecd5c8,3b40d1c8000,0,2) at uvm_fault+0xe6 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80002f4b8f80,3b40d1c8f58) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:194
usertrap(ffff80002f4b8f80) at usertrap+0x3d1 sys/arch/amd64/amd64/trap.c:648
recall_trap() at recall_trap+0x8
end trace frame: 0x0, count: -9
ddb> show registers
rdi               0xe2bc8b9a5d047273
rsi                   0x514100003000
rbp               0xffff80002f4b8a90
rbx               0xe2bcdadb5d044273
rdx                                0
rcx                              0x4
rax               0xffff80002a78a7e0
r8                     0x3b40d1c8000
r9                     0x3b40d1c8001
r10                                0
r11               0x1e9b434e10cf85c0
r12                   0x514100003000
r13               0xffffffff83a25700    kmemstats+0x1880
r14                        0xa30c333    __kernel_phys_end+0x670c333
r15               0xe2bc8b9a5d047273
rip               0xffffffff8250b895    malloc+0x855
cs                               0x8
rflags                       0x10282    __ALIGN_SIZE+0xf282
rsp               0xffff80002f4b89d0
ss                                 0
malloc+0x855:   movq    0x8(%rbx),%r14
ddb>