panic: ffs_valloc: dup alloc
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 463569  82663      0           0          0    0  syz-executor
*197911  25159  60928        0x10  0x4000000    1K syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff830dc629) at panic+0x1e5 sys/kern/subr_prf.c:198
ffs_inode_alloc(fffffd806cce8bb0,a1ed,fffffd807f7d34e0,ffff80003568b410) at ffs_inode_alloc+0x96c sys/ufs/ffs/ffs_alloc.c:404
ufs_makeinode(a1ed,fffffd806d15c8c0,ffff80003568b660,ffff80003568b690) at ufs_makeinode+0xcb sys/ufs/ufs/ufs_vnops.c:1728
ufs_symlink(ffff80003568b4e0) at ufs_symlink+0x54 sys/ufs/ufs/ufs_vnops.c:1293
VOP_SYMLINK(fffffd806d15c8c0,ffff80003568b660,ffff80003568b690,ffff80003568b590,ffff800029fe7c00) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432
dosymlinkat(ffff800030fafc28,200000c0,ffffff9c,20000180) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806
syscall(ffff80003568b810) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80003568b810) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4927bd41f20, count: 6
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:437
panic(ffffffff830dc629) at panic+0x1e5 sys/kern/subr_prf.c:198
ffs_inode_alloc(fffffd806cce8bb0,a1ed,fffffd807f7d34e0,ffff80003568b410) at ffs_inode_alloc+0x96c sys/ufs/ffs/ffs_alloc.c:404
ufs_makeinode(a1ed,fffffd806d15c8c0,ffff80003568b660,ffff80003568b690) at ufs_makeinode+0xcb sys/ufs/ufs/ufs_vnops.c:1728
ufs_symlink(ffff80003568b4e0) at ufs_symlink+0x54 sys/ufs/ufs/ufs_vnops.c:1293
VOP_SYMLINK(fffffd806d15c8c0,ffff80003568b660,ffff80003568b690,ffff80003568b590,ffff800029fe7c00) at VOP_SYMLINK+0x11a sys/kern/vfs_vops.c:432
dosymlinkat(ffff800030fafc28,200000c0,ffffff9c,20000180) at dosymlinkat+0x1dd sys/kern/vfs_syscalls.c:1806
syscall(ffff80003568b810) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80003568b810) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4927bd41f20, count: -9
ddb{1}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff80003568b1a0
rbx               0xffff800029b7cd87
rdx               0xffff8000011a62c0
rcx               0xffff800030fafc28
rax               0xffff800029b7bff0
r8                 0x101010101010101
r9                0x8080808080808080
r10               0xc522d7ecdc1e1e29
r11               0x1255b2577945d665
r12               0xffff800029b7cb88
r13                                0
r14                                0
r15                              0x1
rip               0xffffffff8133b9e5    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff80003568b190
ss                                 0
db_enter+0x25:  addq    $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=197911 pid=25159 tcnt=2 stat=onproc
    flags process=10<SUGID> proc=4000000<THREAD>
    runpri=17, usrpri=86, slppri=17, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff800030faef80,0xffff80002a0402b0
    process=0xffff8000ffff5238 user=0xffff800035686000, vmspace=0xfffffd806bff26e8
    estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 82663  463569  55246      0  7           0                syz-executor
 82663  202692  55246      0  2   0x4000000                syz-executor
 25159  396804  72448  60928  2        0x10                syz-executor
*25159  197911  72448  60928  7   0x4000010                syz-executor
 69502  502110  73359      0  2           0                syz-executor
 69502  409963  73359      0  3   0x4000080  fsleep        syz-executor
 76490  484955  38392      0  3        0x80  nanoslp       syz-execut