login: panic: ffs_valloc: dup alloc
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 254360  67227      0           0          0    0  syz-executor
*277822   1760      0         0x2          0    1K syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8349b778) at panic+0x1e5 sys/kern/subr_prf.c:198
ffs_inode_alloc(fffffd806d4da010,41ed,fffffd80097fd7b8,ffff80002a2ca9c8) at ffs_inode_alloc+0x94e
ufs_mkdir(ffff80002a2caa30) at ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
VOP_MKDIR(fffffd806dd06980,ffff80002a2cab90,ffff80002a2cabc0,ffff80002a2caac0) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
domkdirat(ffff8000ffffd9f8,ffffff9c,751583a4f7f0,1ff) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3149
syscall(ffff80002a2cad40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a2cad40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x751583a4f890, 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{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: ffs_valloc: dup alloc
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8349b778) at panic+0x1e5 sys/kern/subr_prf.c:198
ffs_inode_alloc(fffffd806d4da010,41ed,fffffd80097fd7b8,ffff80002a2ca9c8) at ffs_inode_alloc+0x94e
ufs_mkdir(ffff80002a2caa30) at ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
VOP_MKDIR(fffffd806dd06980,ffff80002a2cab90,ffff80002a2cabc0,ffff80002a2caac0) at VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
domkdirat(ffff8000ffffd9f8,ffffff9c,751583a4f7f0,1ff) at domkdirat+0x179 sys/kern/vfs_syscalls.c:3149
syscall(ffff80002a2cad40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a2cad40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x751583a4f890, count: -8
ddb{1}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff80002a2ca740
rbx               0xffff80002999ee07
rdx                                0
rcx               0xffff8000ffffd9f8
rax               0xffff80002999dff0
r8                 0x101010101010101
r9                0x8080808080808080
r10                0x688b196b170c205
r11                0xa115655f98f6917
r12               0xffff80002999ec08
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff815b6345    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff80002a2ca730
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=277822 pid=1760 tcnt=1 stat=onproc
    flags process=2<EXEC> proc=0
    runpri=17, usrpri=50, slppri=17, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff8000ffffd4c8,0xffff8000ffffd240
    process=0xffff8000ffff39d0 user=0xffff80002a2c5000, vmspace=0xfffffd806f3787a8
    estcpu=36, cpticks=120, pctcpu=0.74, user=0, sys=119, intr=0
ddb{1}>