IPVS: set_ctl: invalid protocol: 65286 0.0.0.0:60696 

=====================================
[ BUG: bad unlock balance detected! ]
4.9.78-g7be1985 #24 Not tainted
-------------------------------------
syz-executor6/23707 is trying to release lock (mrt_lock) at:
[<ffffffff834e8764>] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553
but there are no more locks to release!

other info that might help us debug this:
1 lock held by syz-executor6/23707:
IPVS: set_ctl: invalid protocol: 65286 0.0.0.0:60696 
 #0:  (&p->lock){+.+.+.}, at: [<ffffffff815e873d>] seq_read+0xdd/0x1290 fs/seq_file.c:178

stack backtrace:
CPU: 1 PID: 23707 Comm: syz-executor6 Not tainted 4.9.78-g7be1985 #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ba217860 ffffffff81d94409 ffffffff849b6c78 ffff8801d85c0000
 ffffffff834e8764 ffffffff849b6c78 ffff8801d85c0888 ffff8801ba217890
 ffffffff81237df4 dffffc0000000000 ffffffff849b6c78 00000000ffffffff
Call Trace:
 [<ffffffff81d94409>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94409>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81237df4>] print_unlock_imbalance_bug+0x174/0x1a0 kernel/locking/lockdep.c:3398
 [<ffffffff812408c8>] __lock_release kernel/locking/lockdep.c:3540 [inline]
 [<ffffffff812408c8>] lock_release+0x6f8/0xb80 kernel/locking/lockdep.c:3775
 [<ffffffff838b27ba>] __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline]
 [<ffffffff838b27ba>] _raw_read_unlock+0x1a/0x50 kernel/locking/spinlock.c:255
binder_alloc: binder_alloc_mmap_handler: 23721 2033d000-2033e000 already mapped failed -16
 [<ffffffff834e8764>] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553
 [<ffffffff815e56f7>] traverse+0x3a7/0x900 fs/seq_file.c:148
 [<ffffffff815e8e4a>] seq_read+0x7ea/0x1290 fs/seq_file.c:195
 [<ffffffff816c1ddf>] proc_reg_read+0xef/0x170 fs/proc/inode.c:202
 [<ffffffff8156c6a1>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff81570510>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff81570510>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff815707c4>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff81570b65>] do_preadv+0x115/0x1a0 fs/read_write.c:975
 [<ffffffff81573e40>] SYSC_preadv fs/read_write.c:1025 [inline]
 [<ffffffff81573e40>] SyS_preadv+0x30/0x40 fs/read_write.c:1020
 [<ffffffff838b2c6e>] entry_SYSCALL_64_fastpath+0x29/0xe8
device gre0 entered promiscuous mode
device gre0 entered promiscuous mode
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
unregister_netdevice: waiting for lo to become free. Usage count = 3