syzbot

panic: missing alias
Starting stack trace...
panic(ffffffff82fbfdfa) at panic+0x1ba sys/kern/subr_prf.c:229
vgonel(fffffd80715d8468,ffff80002a5b5458) at vgonel+0x681 sys/kern/vfs_subr.c:1202
checkalias(fffffd8060b90b08,0,ffff800000b5d400) at checkalias+0x1ab
ffs_vinit(ffff800000b5d400,ffff80002ca3f110) at ffs_vinit+0x13d
ffs_vget(ffff800000b5d400,1969b,ffff80002ca3f1f8) at ffs_vget+0x421 sys/ufs/ffs/ffs_vfsops.c:1283
ufs_lookup() at ufs_lookup+0x16bc sys/ufs/ufs/ufs_lookup.c:573
VOP_LOOKUP(fffffd8065217c08,ffff80002ca3f648,ffff80002ca3f678) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
vfs_lookup(ffff80002ca3f618) at vfs_lookup+0x8e1 sys/kern/vfs_lookup.c:566
namei(ffff80002ca3f618) at namei+0x7aa sys/kern/vfs_lookup.c:250
vn_open(ffff80002ca3f618,1,0) at vn_open+0x13f sys/kern/vfs_vnops.c:140
doopenat(ffff80002a5b5458,ffffff9c,20000380,0,0,ffff80002ca3f7c0) at doopenat+0x31d sys/kern/vfs_syscalls.c:1123
syscall(ffff80002ca3f870) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x8aa6b1921c0, count: 244
End of stack trace.