IPVS: Creating netns size=2536 id=12

=====================================
[ BUG: bad unlock balance detected! ]
4.9.75-g5f5e5d4 #7 Not tainted
-------------------------------------
syz-executor6/10976 is trying to release lock (mrt_lock) at:
[<ffffffff834e6574>] 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-executor6/10976:
 #0:  (&p->lock){+.+.+.}, at: [<ffffffff815e74bd>] seq_read+0xdd/0x1290 fs/seq_file.c:178

stack backtrace:
CPU: 0 PID: 10976 Comm: syz-executor6 Not tainted 4.9.75-g5f5e5d4 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801b34ef918 ffffffff81d93049 ffffffff849b67b8 ffff8801d6089800
 ffffffff834e6574 ffffffff849b67b8 ffff8801d608a088 ffff8801b34ef948
 ffffffff81236bf4 dffffc0000000000 ffffffff849b67b8 00000000ffffffff
Call Trace:
 [<ffffffff81d93049>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93049>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81236bf4>] print_unlock_imbalance_bug+0x174/0x1a0 kernel/locking/lockdep.c:3398
 [<ffffffff8123f6c8>] __lock_release kernel/locking/lockdep.c:3540 [inline]
 [<ffffffff8123f6c8>] lock_release+0x6f8/0xb80 kernel/locking/lockdep.c:3775
 [<ffffffff838b05fa>] __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline]
 [<ffffffff838b05fa>] _raw_read_unlock+0x1a/0x50 kernel/locking/spinlock.c:255
 [<ffffffff834e6574>] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553
 [<ffffffff815e4477>] traverse+0x3a7/0x900 fs/seq_file.c:148
 [<ffffffff815e7bca>] seq_read+0x7ea/0x1290 fs/seq_file.c:195
 [<ffffffff816c0b5f>] proc_reg_read+0xef/0x170 fs/proc/inode.c:202
 [<ffffffff8156a8a3>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156e63e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff8157272f>] SYSC_pread64 fs/read_write.c:629 [inline]
 [<ffffffff8157272f>] SyS_pread64+0x13f/0x170 fs/read_write.c:616
 [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=55545 sclass=netlink_route_socket pig=12595 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=55545 sclass=netlink_route_socket pig=12595 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=82 sclass=netlink_xfrm_socket pig=12628 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=199 sclass=netlink_route_socket pig=12959 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=12983 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=7988 sclass=netlink_route_socket pig=13376 comm=syz-executor6
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=7988 sclass=netlink_route_socket pig=13385 comm=syz-executor6
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=57616 sclass=netlink_route_socket pig=13610 comm=syz-executor6
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=57616 sclass=netlink_route_socket pig=13610 comm=syz-executor6