IPVS: set_ctl: invalid protocol: 51 224.0.0.1:20004

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WARNING: lock held when returning to user space!
4.18.0+ #198 Not tainted
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syz-executor5/8610 is leaving the kernel with locks still held!
1 lock held by syz-executor5/8610:
 #0: 000000005b8f856a (&fi->mutex){+.+.}, at: fuse_lock_inode+0xaf/0xe0 fs/fuse/inode.c:363
IPVS: set_ctl: invalid protocol: 135 172.20.20.170:20004