=====================================
[ BUG: bad unlock balance detected! ]
4.4.111-g1849cd3 #26 Not tainted
-------------------------------------
syz-executor0/11487 is trying to release lock (mrt_lock) at:
[<ffffffff833c9304>] 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-executor0/11487:
 #0:  (&p->lock){+.+.+.}, at: [<ffffffff8158ce7d>] seq_read+0xdd/0x1270 fs/seq_file.c:178

stack backtrace:
CPU: 0 PID: 11487 Comm: syz-executor0 Not tainted 4.4.111-g1849cd3 #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 32a8b89518b1001b ffff8800bb9a79f8 ffffffff81d0509d
 ffffffff84770798 ffff8801ceef8000 ffffffff833c9304 ffffffff84770798
 ffff8801ceef8848 ffff8800bb9a7a28 ffffffff81232374 dffffc0000000000
Call Trace:
 [<ffffffff81d0509d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0509d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81232374>] print_unlock_imbalance_bug+0x174/0x1a0 kernel/locking/lockdep.c:3266
 [<ffffffff8123d21a>] __lock_release kernel/locking/lockdep.c:3408 [inline]
 [<ffffffff8123d21a>] lock_release+0x72a/0xc10 kernel/locking/lockdep.c:3611
 [<ffffffff8377519a>] __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline]
 [<ffffffff8377519a>] _raw_read_unlock+0x1a/0x50 kernel/locking/spinlock.c:255
 [<ffffffff833c9304>] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553
 [<ffffffff8158d820>] seq_read+0xa80/0x1270 fs/seq_file.c:283
 [<ffffffff81665cef>] proc_reg_read+0xef/0x170 fs/proc/inode.c:202
 [<ffffffff8151c383>] __vfs_read+0x103/0x440 fs/read_write.c:432
 [<ffffffff8151e223>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff81520f2f>] SYSC_pread64 fs/read_write.c:607 [inline]
 [<ffffffff81520f2f>] SyS_pread64+0x13f/0x170 fs/read_write.c:594
 [<ffffffff83775899>] entry_SYSCALL_64_fastpath+0x16/0x92
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=10383 sclass=netlink_route_socket
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=10383 sclass=netlink_route_socket