uvm_fault(0xffffffff83a0a7b0, 0xffff800020b62430, 0, 2) -> d
kernel: page fault trap, code=2
Stopped at      memset+0x52:    repe stosq      %es:(%rdi)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
* 40278  59039      0         0x2        0x1    0  syz-executor
memset() at memset+0x52
ffs_write(ffff80002a82b920) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401
VOP_WRITE(fffffb006de78298,ffff80002a82b9d0,3,fffffb0007ffd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a7367d0,fffffb006de78298,fffffb0007ffd820,ffff80002a82baa0,ffff80002a82ba80) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:692
ktrsysret(ffff80002a7367d0,88,16,ffff80002a82bb60) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80002a7367d0,88,16,ffff80002a82bb60) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209
syscall(ffff80002a82bc10) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80002a82bc10) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x79524f523340, 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(0xffffffff83a0a7b0, 0xffff800020b62430, 0, 2) -> d
ddb>