uvm_fault(0xffffffff8396b6b8, 0xffff800024972038, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at      ffs2_balloc+0xa0a:      movq    0(%rcx,%rax,8),%r14
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*384132  87374      0         0x2        0x1    0  syz-executor
ffs2_balloc(fffffd806ec4cd00,4d067,48,fffffd8007ffd750,1,ffff80002a84ce58) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614
ffs_write(ffff80002a84cee0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd8065a6abd0,ffff80002a84cf90,3,fffffd8007ffd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a756f98,fffffd8065a6abd0,fffffd8007ffd750,ffff80002a84d060,ffff80002a84d040) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:691
ktrsysret(ffff80002a756f98,88,16,ffff80002a84d120) at ktrsysret+0x17f ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline]
ktrsysret(ffff80002a756f98,88,16,ffff80002a84d120) at ktrsysret+0x17f sys/kern/kern_ktrace.c:209
syscall(ffff80002a84d1d0) at syscall+0xad9 mi_syscall_return sys/sys/syscall_mi.h:204 [inline]
syscall(ffff80002a84d1d0) at syscall+0xad9 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x700d5c7c6770, 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(0xffffffff8396b6b8, 0xffff800024972038, 0, 1) -> d
ddb>