panic: ffs_valloc: dup alloc
Stopped at      db_enter+0x17:  popq    %rbp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
  68942  70133      0           0          0    1  syz-executor
*357273  70133      0           0  0x4000000    0K syz-executor
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84e41380) at panic+0x270 sys/kern/subr_prf.c:198
ffs_inode_alloc(ffff8000019e4940,8000,ffff8000001195b0,ffff80003bd342b0) at ffs_inode_alloc+0xcd7
ufs_makeinode(8000,ffff800001e277d8,ffff80003bd34860,ffff80003bd34890) at ufs_makeinode+0x1a1 sys/ufs/ufs/ufs_vnops.c:1759
ufs_create(ffff80003bd343e0) at ufs_create+0xcf sys/ufs/ufs/ufs_vnops.c:147
VOP_CREATE(ffff800001e277d8,ffff80003bd34860,ffff80003bd34890,ffff80003bd34500) at VOP_CREATE+0x1a2 sys/kern/vfs_vops.c:103
vn_open(ffff80003bd34830,ca9cf33e,0) at vn_open+0x6d9 sys/kern/vfs_vnops.c:118
doopenat(ffff800045ff54e0,ffffff9c,200000000180,ca9cf73d,2,0,ffff80003bd34ba0) at doopenat+0x460 sys/kern/vfs_syscalls.c:1163
sys_open(ffff800045ff54e0,ffff80003bd34ba0,ffff80003bd34b00) at sys_open+0x86 sys/kern/vfs_syscalls.c:1065
syscall(ffff80003bd34ba0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003bd34ba0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf2ad5ed4a80, count: 4
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: ffs_valloc: dup alloc
ddb{0}>