uvm_fault(0xffffffff83ab44f0, 0xffff800027f72290, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at      ffs2_balloc+0xa0d:      movq    0(%rcx,%rax,8),%r14
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
* 62111  49546      0           0  0x4000000    0K syz-executor
ffs2_balloc(fffffd806e884078,178000,4000,fffffd80097fd618,2,ffff80002a271348) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614
ffs_write(ffff80002a2713d0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806ddc21b8,ffff80002a271588,7,fffffd80097fd618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd8076a871e0,ffff80002a271588,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a243c98,4,ffff80002a271588,0,ffff80002a271640) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_write(ffff80002a243c98,ffff80002a2716f0,ffff80002a271640) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002a2716f0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a2716f0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x38a544231f0, count: 7
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(0xffffffff83ab44f0, 0xffff800027f72290, 0, 1) -> d
ddb{0}> trace
ffs2_balloc(fffffd806e884078,178000,4000,fffffd80097fd618,2,ffff80002a271348) at ffs2_balloc+0xa0d sys/ufs/ffs/ffs_balloc.c:614
ffs_write(ffff80002a2713d0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806ddc21b8,ffff80002a271588,7,fffffd80097fd618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd8076a871e0,ffff80002a271588,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a243c98,4,ffff80002a271588,0,ffff80002a271640) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_write(ffff80002a243c98,ffff80002a2716f0,ffff80002a271640) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002a2716f0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a2716f0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x38a544231f0, count: -8
ddb{0}>