uvm_fault(0xfffff7000b1f73d0, 0x100000010, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at      amap_lookups+0x1e0:     movl    0x10(%r12),%r14d
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*443942   4754      0         0x2          0    0  syz-executor
amap_lookups(fffff7006d7ebd30,17000,ffff80002a37dd70,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:120 [inline]
amap_lookups(fffff7006d7ebd30,17000,ffff80002a37dd70,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1170
uvm_fault_check(ffff80002a37de70,ffff80002a37dea8,ffff80002a37dee0,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff7000b1f73d0,487df638000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80002a37e010,487df6387e0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:194
usertrap(ffff80002a37e010) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:648
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x753ff4dab900, count: 9
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
ddb{0}> 
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: uvm_fault(0xfffff7000b1f73d0, 0x100000010, 0, 1) -> e
ddb{0}> show kasan
No such command
ddb{0}> trace
amap_lookups(fffff7006d7ebd30,17000,ffff80002a37dd70,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:120 [inline]
amap_lookups(fffff7006d7ebd30,17000,ffff80002a37dd70,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1170
uvm_fault_check(ffff80002a37de70,ffff80002a37dea8,ffff80002a37dee0,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff7000b1f73d0,487df638000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80002a37e010,487df6387e0) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:194
usertrap(ffff80002a37e010) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:648
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x753ff4dab900, count: -6
ddb{0}> show registers
rdi                             0x11
rsi                             0x40
rbp               0xffff80002a37dcc0
rbx                             0x17
rdx                                0
rcx                              0x1
rax               0xffff80000159eb60
r8                     0x487df638000
r9                     0x487df638001
r10                                0
r11               0x1b6482044e81af99
r12                      0x100000000
r13                              0x1
r14                             0x40
r15                             0x10
rip               0xffffffff8181ecf0    amap_lookups+0x1e0
cs                               0x8
rflags                       0x10202    __ALIGN_SIZE+0xf202
rsp               0xffff80002a37dc30
ss                                 0
amap_lookups+0x1e0:     movl    0x10(%r12),%r14d
ddb{0}>