=====================================
[ BUG: bad unlock balance detected! ]
4.9.69-g3f1d77c #108 Not tainted
-------------------------------------
sock: process `syz-executor2' is using obsolete getsockopt SO_BSDCOMPAT
syz-executor3/8396 is trying to release lock ([   99.245827] netlink: 9 bytes leftover after parsing attributes in process `syz-executor1'.
A link change request failed with some changes committed already. Interface lo may have been left with an inconsistent configuration, please check.
mrt_lock) at:
but there are no more locks to release!

other info that might help us debug this:
2 locks held by syz-executor3/8396:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815cfb1f>] __fdget_pos+0x9f/0xc0 fs/file.c:781
 #1:  (&p->lock){+.+.+.}, at: [<ffffffff815e4f1d>] seq_read+0xdd/0x1290 fs/seq_file.c:178

stack backtrace:
CPU: 0 PID: 8396 Comm: syz-executor3 Not tainted 4.9.69-g3f1d77c #108
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d68378e8 ffffffff81d90a29 ffffffff849ae9f8 ffff8801d6214800
 ffffffff834dfd74 ffffffff849ae9f8 ffff8801d6215088 ffff8801d6837918
 ffffffff81235404 dffffc0000000000 ffffffff849ae9f8 00000000ffffffff
Call Trace:
 [<ffffffff81d90a29>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d90a29>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81235404>] print_unlock_imbalance_bug+0x174/0x1a0 kernel/locking/lockdep.c:3398
 [<ffffffff8123ded8>] __lock_release kernel/locking/lockdep.c:3540 [inline]
 [<ffffffff8123ded8>] lock_release+0x6f8/0xb80 kernel/locking/lockdep.c:3775
 [<ffffffff838aa67a>] __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline]
 [<ffffffff838aa67a>] _raw_read_unlock+0x1a/0x50 kernel/locking/spinlock.c:255
 [<ffffffff834dfd74>] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553
 [<ffffffff815e58c3>] seq_read+0xa83/0x1290 fs/seq_file.c:283
 [<ffffffff816be57f>] proc_reg_read+0xef/0x170 fs/proc/inode.c:202
 [<ffffffff81568ef1>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156cd60>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156cd60>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156d014>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8156d136>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff81570627>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff81570627>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838aab05>] entry_SYSCALL_64_fastpath+0x23/0xc6
SELinux: unrecognized netlink message: protocol=4 nlmsg_type=18444 sclass=netlink_tcpdiag_socket pig=8433 comm=syz-executor5
SELinux: unrecognized netlink message: protocol=4 nlmsg_type=18444 sclass=netlink_tcpdiag_socket pig=8433 comm=syz-executor5
netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'.
netlink: 5 bytes leftover after parsing attributes in process `syz-executor2'.
tc_dump_action: action bad kind
tc_dump_action: action bad kind
device gre0 entered promiscuous mode
loop_reread_partitions: partition scan of loop0 (2°]€fI¸Òæ¶Ì”B±!S,›ùDÏ') failed (rc=-13)