=====================================
[ BUG: bad unlock balance detected! ]
4.9.67-g12cae95 #105 Not tainted
-------------------------------------
syz-executor6/9218 is trying to release lock ([   64.485719] netlink: 3 bytes leftover after parsing attributes in process `syz-executor1'.
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 1 PID: 9236 Comm: syz-executor0 Not tainted 4.9.67-g12cae95 #105
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801ca06f850
 ffffffff81d906e9 ffff8801ca06fb30 0000000000000000 ffff8801d94d3a90
 ffff8801ca06fa20 ffff8801d94d3980 ffff8801ca06fa48 ffffffff8165e307
 ffffffff838a9178 ffff8801ca06f9a0 00000001a3564067Call Trace:
 [<ffffffff81d906e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d906e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8165e307>] handle_userfault+0xa37/0x1300 fs/userfaultfd.c:323
 [<ffffffff814cd5f1>] do_anonymous_page mm/memory.c:2747 [inline]
 [<ffffffff814cd5f1>] handle_pte_fault mm/memory.c:3488 [inline]
 [<ffffffff814cd5f1>] __handle_mm_fault mm/memory.c:3577 [inline]
 [<ffffffff814cd5f1>] handle_mm_fault+0x1fd1/0x2530 mm/memory.c:3614
 [<ffffffff810dd452>] __do_page_fault+0x5c2/0xd40 arch/x86/mm/fault.c:1406
 [<ffffffff810ddbf7>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1469
 [<ffffffff838aab58>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1012
 [<ffffffff815a814c>] do_fcntl fs/fcntl.c:284 [inline]
 [<ffffffff815a814c>] SYSC_fcntl fs/fcntl.c:372 [inline]
 [<ffffffff815a814c>] SyS_fcntl+0x81c/0xc70 fs/fcntl.c:357
 [<ffffffff838a9985>] entry_SYSCALL_64_fastpath+0x23/0xc6
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 1 PID: 9244 Comm: syz-executor0 Not tainted 4.9.67-g12cae95 #105
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801a5a8f850
 ffffffff81d906e9 ffff8801a5a8fb30 0000000000000000 ffff8801d94d3c10
 ffff8801a5a8fa20 ffff8801d94d3b00 ffff8801a5a8fa48 ffffffff8165e307
 ffff8801a5a8f8b8 ffff8801a5a8f9a0 00000001a36ec067Call Trace:
 [<ffffffff81d906e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d906e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8165e307>] handle_userfault+0xa37/0x1300 fs/userfaultfd.c:323
 [<ffffffff814cd5f1>] do_anonymous_page mm/memory.c:2747 [inline]
 [<ffffffff814cd5f1>] handle_pte_fault mm/memory.c:3488 [inline]
 [<ffffffff814cd5f1>] __handle_mm_fault mm/memory.c:3577 [inline]
 [<ffffffff814cd5f1>] handle_mm_fault+0x1fd1/0x2530 mm/memory.c:3614
 [<ffffffff810dd452>] __do_page_fault+0x5c2/0xd40 arch/x86/mm/fault.c:1406
 [<ffffffff810ddbf7>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1469
 [<ffffffff838aab58>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1012
 [<ffffffff815a814c>] do_fcntl fs/fcntl.c:284 [inline]
 [<ffffffff815a814c>] SYSC_fcntl fs/fcntl.c:372 [inline]
 [<ffffffff815a814c>] SyS_fcntl+0x81c/0xc70 fs/fcntl.c:357
 [<ffffffff838a9985>] entry_SYSCALL_64_fastpath+0x23/0xc6
mrt_lock) at:
but there are no more locks to release!

other info that might help us debug this:
1 lock held by syz-executor6/9218:
 #0:  (&p->lock){+.+.+.}, at: [<ffffffff815e4cdd>] seq_read+0xdd/0x1290 fs/seq_file.c:178

stack backtrace:
CPU: 0 PID: 9218 Comm: syz-executor6 Not tainted 4.9.67-g12cae95 #105
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801a6f1f8e8 ffffffff81d906e9 ffffffff849ae8f8 ffff8801d22c0000
 ffffffff834dec54 ffffffff849ae8f8 ffff8801d22c0888 ffff8801a6f1f918
 ffffffff812353f4 dffffc0000000000 ffffffff849ae8f8 00000000ffffffff
Call Trace:
 [<ffffffff81d906e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d906e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff812353f4>] print_unlock_imbalance_bug+0x174/0x1a0 kernel/locking/lockdep.c:3398
 [<ffffffff8123dec8>] __lock_release kernel/locking/lockdep.c:3540 [inline]
 [<ffffffff8123dec8>] lock_release+0x6f8/0xb80 kernel/locking/lockdep.c:3775
 [<ffffffff838a951a>] __raw_read_unlock include/linux/rwlock_api_smp.h:225 [inline]
 [<ffffffff838a951a>] _raw_read_unlock+0x1a/0x50 kernel/locking/spinlock.c:255
 [<ffffffff834dec54>] ipmr_mfc_seq_stop+0xe4/0x140 net/ipv6/ip6mr.c:553
 [<ffffffff815e5683>] seq_read+0xa83/0x1290 fs/seq_file.c:283
 [<ffffffff816be32f>] proc_reg_read+0xef/0x170 fs/proc/inode.c:202
 [<ffffffff81568cb1>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156cb20>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156cb20>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156cdd4>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8156cef6>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff815703e7>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff815703e7>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838a9985>] entry_SYSCALL_64_fastpath+0x23/0xc6
binder: 9278:9279 ERROR: BC_REGISTER_LOOPER called without request
binder: 9278:9288 BC_DEAD_BINDER_DONE 0000000000000000 not found
binder: 9278:9288 got reply transaction with no transaction stack
binder: 9278:9288 transaction failed 29201/-71, size 48-16 line 2923
binder: 9278:9279 ERROR: BC_REGISTER_LOOPER called without request
binder: 9278:9288 BC_DEAD_BINDER_DONE 0000000000000000 not found
binder: 9278:9288 got reply transaction with no transaction stack
binder: 9278:9288 transaction failed 29201/-71, size 48-16 line 2923
IPVS: Creating netns size=2536 id=19
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=9337 comm=syz-executor0
pktgen: kernel_thread() failed for cpu 0
pktgen: Cannot create thread for cpu 0 (-4)
pktgen: kernel_thread() failed for cpu 1
pktgen: Cannot create thread for cpu 1 (-4)
pktgen: Initialization failed for all threads
device gre0 entered promiscuous mode
device lo entered promiscuous mode
device gre0 entered promiscuous mode
netlink: 17 bytes leftover after parsing attributes in process `syz-executor5'.
netlink: 17 bytes leftover after parsing attributes in process `syz-executor5'.
binder: 9643:9647 got transaction with invalid parent offset or type
binder: 9643:9647 transaction failed 29201/-22, size 80-16 line 3315
binder: BINDER_SET_CONTEXT_MGR already set
binder_alloc: binder_alloc_mmap_handler: 9643 20000000-20002000 already mapped failed -16
netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'.
binder: 9643:9665 ioctl 40046207 0 returned -16
netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'.
binder: undelivered TRANSACTION_ERROR: 29201