panic: ufs_rename: lost dir entry
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*306414  85393  60929        0x10  0x4000000    0K syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83557e04) at panic+0x1e5 sys/kern/subr_prf.c:198
ufs_rename(ffff800037b9a8b8) at ufs_rename+0x175f sys/ufs/ufs/ufs_vnops.c:883
VOP_RENAME(fffff50066d4d530,fffff50066d4de78,ffff800037b9aa88,fffff50066d4d530,0,ffff800037b9a9d8) at VOP_RENAME+0x137 sys/kern/vfs_vops.c:376
dorenameat(ffff80003c3ef780,ffffff9c,200000000140,ffffff9c,200000000340) at dorenameat+0x3f7 sys/kern/vfs_syscalls.c:2983
syscall(ffff800037b9ac20) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800037b9ac20) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd9667998b00, 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{0}> 
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: ufs_rename: lost dir entry
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83557e04) at panic+0x1e5 sys/kern/subr_prf.c:198
ufs_rename(ffff800037b9a8b8) at ufs_rename+0x175f sys/ufs/ufs/ufs_vnops.c:883
VOP_RENAME(fffff50066d4d530,fffff50066d4de78,ffff800037b9aa88,fffff50066d4d530,0,ffff800037b9a9d8) at VOP_RENAME+0x137 sys/kern/vfs_vops.c:376
dorenameat(ffff80003c3ef780,ffffff9c,200000000140,ffffff9c,200000000340) at dorenameat+0x3f7 sys/kern/vfs_syscalls.c:2983
syscall(ffff800037b9ac20) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800037b9ac20) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd9667998b00, count: -7
ddb{0}>