panic: bad dir
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
* 32477  61538      0    0x100803     0x2000    0  getty
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83390468) at panic+0x1cf sys/kern/subr_prf.c:198
ufs_lookup() at ufs_lookup+0x1eca
VOP_LOOKUP(fffffd8009871798,ffff8000374d2c80,ffff8000374d2cb0) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff8000374d2c50) at vfs_lookup+0x961 sys/kern/vfs_lookup.c:567
namei(ffff8000374d2c50) at namei+0x7ca sys/kern/vfs_lookup.c:250
vn_open(ffff8000374d2c50,306,180) at vn_open+0x1f1 sys/kern/vfs_vnops.c:107
coredump(ffff80002a776540) at coredump+0x44a sys/kern/kern_sig.c:1974
sigexit(ffff80002a776540,5) at sigexit+0xd6 sys/kern/kern_sig.c:1833
postsig(ffff80002a776540,5,ffff8000374d2f78) at postsig+0x686 sys/kern/kern_sig.c:1763
userret(ffff80002a776540) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff8000374d30a0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000374d30a0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb440a1e6d0, count: 2
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: bad dir
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83390468) at panic+0x1cf sys/kern/subr_prf.c:198
ufs_lookup() at ufs_lookup+0x1eca
VOP_LOOKUP(fffffd8009871798,ffff8000374d2c80,ffff8000374d2cb0) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff8000374d2c50) at vfs_lookup+0x961 sys/kern/vfs_lookup.c:567
namei(ffff8000374d2c50) at namei+0x7ca sys/kern/vfs_lookup.c:250
vn_open(ffff8000374d2c50,306,180) at vn_open+0x1f1 sys/kern/vfs_vnops.c:107
coredump(ffff80002a776540) at coredump+0x44a sys/kern/kern_sig.c:1974
sigexit(ffff80002a776540,5) at sigexit+0xd6 sys/kern/kern_sig.c:1833
postsig(ffff80002a776540,5,ffff8000374d2f78) at postsig+0x686 sys/kern/kern_sig.c:1763
userret(ffff80002a776540) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff8000374d30a0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000374d30a0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb440a1e6d0, count: -13
ddb> show registers
rdi                                0
rsi                              0x1
rbp               0xffff8000374d27d0
rbx                                0
rdx                                0
rcx                                0
rax               0xffff80002a776540
r8                 0x101010101010101
r9                0x8080808080808080
r10               0xe90c459e66d0e3c0
r11               0xab1a46193d8127ed
r12                                0
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff81a359b5    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff8000374d27c0
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb>