login: uvm_fault(0xffffffff83b11080, 0xffff8000228c2000, 0, 2) -> d
kernel: page fault trap, code=2
Stopped at      memset+0x52:    repe stosq      %es:(%rdi)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*472653  24352      0      0x1004          0    0K syz-executor
memset() at memset+0x52
ffs_write(ffff80002a2d3fc0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cfb6700,ffff80002a2d4050,0,fffffd80097fd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
uvn_io(fffffd806ec9ae18,ffff80002a2d41d0,1,39,1) at uvn_io+0x498 sys/uvm/uvm_vnode.c:1232
uvm_pager_put(fffffd806ec9ae18,fffffd80089cd298,ffff80002a2d4270,ffff80002a2d4294,39,0,fd1f74871d591f04) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:505
uvn_flush(fffffd806ec9ae18,0,0,19) at uvn_flush+0x690 sys/uvm/uvm_vnode.c:705
uvn_detach(fffffd806ec9ae18) at uvn_detach+0xcf sys/uvm/uvm_vnode.c:344
uvm_unmap_detach(ffff80002a2d43b8,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370
uvmspace_exec(ffff80003c3d6028,1000,7f7fffffc000) at uvmspace_exec+0x3b7 sys/uvm/uvm_map.c:3404
sys_execve(ffff80003c3d6028,ffff80002a2d4a50,ffff80002a2d49a0) at sys_execve+0xc31 sys/kern/kern_exec.c:453
syscall(ffff80002a2d4a50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a2d4a50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x789dc0d277e0, count: 3
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(0xffffffff83b11080, 0xffff8000228c2000, 0, 2) -> d
ddb{0}> trace
memset() at memset+0x52
ffs_write(ffff80002a2d3fc0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cfb6700,ffff80002a2d4050,0,fffffd80097fd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
uvn_io(fffffd806ec9ae18,ffff80002a2d41d0,1,39,1) at uvn_io+0x498 sys/uvm/uvm_vnode.c:1232
uvm_pager_put(fffffd806ec9ae18,fffffd80089cd298,ffff80002a2d4270,ffff80002a2d4294,39,0,fd1f74871d591f04) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:505
uvn_flush(fffffd806ec9ae18,0,0,19) at uvn_flush+0x690 sys/uvm/uvm_vnode.c:705
uvn_detach(fffffd806ec9ae18) at uvn_detach+0xcf sys/uvm/uvm_vnode.c:344
uvm_unmap_detach(ffff80002a2d43b8,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370
uvmspace_exec(ffff80003c3d6028,1000,7f7fffffc000) at uvmspace_exec+0x3b7 sys/uvm/uvm_map.c:3404
sys_execve(ffff80003c3d6028,ffff80002a2d4a50,ffff80002a2d49a0) at sys_execve+0xc31 sys/kern/kern_exec.c:453
syscall(ffff80002a2d4a50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a2d4a50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x789dc0d277e0, count: -12
ddb{0}>