uvm_fault(0xffffffff83a0d4d0, 0xffff800029dd383d, 0, 2) -> d
kernel: page fault trap, code=2
Stopped at      memset+0x49:    repe stosb      %es:(%rdi)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*521392  80823      0           0  0x4000001    0  syz-executor
memset() at memset+0x49
ffs_write(ffff800035ccf690) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401
VOP_WRITE(fffffd006cab1058,ffff800035ccf740,3,fffffd0007ffd5b0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a760fc0,fffffd006cab1058,fffffd0007ffd5b0,ffff800035ccf810,ffff800035ccf7f0) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692
ktrsysret(ffff80002a760fc0,36,0,ffff800035ccf8d0) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80002a760fc0,36,0,ffff800035ccf8d0) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209
syscall(ffff800035ccf980) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff800035ccf980) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7fde52580b0, count: 8
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> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff83a0d4d0, 0xffff800029dd383d, 0, 2) -> d
ddb>