audit: type=1400 audit(1519107434.780:8): avc: denied { map } for pid=4163 comm="syz-execprog" path="/root/syzkaller-shm456392240" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 IPVS: ftp: loaded support on port[0] = 21 IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready ===================================== WARNING: bad unlock balance detected! 4.16.0-rc1+ #232 Not tainted ------------------------------------- kworker/0:1/24 is trying to release lock (rcu_read_lock_bh) at: [] rcu_read_unlock_bh include/linux/rcupdate.h:722 [inline] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 net/netfilter/xt_hashlimit.c:777 but there are no more locks to release! other info that might help us debug this: 5 locks held by kworker/0:1/24: #0: ((wq_completion)"events_power_efficient"){+.+.}, at: [<000000009340efda>] process_one_work+0xaaf/0x1af0 kernel/workqueue.c:2084 #1: ((work_completion)(&(&hinfo->gc_work)->work)){+.+.}, at: [<00000000cb2a0d75>] process_one_work+0xb01/0x1af0 kernel/workqueue.c:2088 #2: ((&idev->mc_dad_timer)){+.-.}, at: [<00000000278ec512>] lockdep_copy_map include/linux/lockdep.h:178 [inline] #2: ((&idev->mc_dad_timer)){+.-.}, at: [<00000000278ec512>] call_timer_fn+0x1c6/0x820 kernel/time/timer.c:1316 #3: (rcu_read_lock){....}, at: [<0000000091b6fc7b>] read_pnet include/net/net_namespace.h:280 [inline] #3: (rcu_read_lock){....}, at: [<0000000091b6fc7b>] dev_net include/linux/netdevice.h:2056 [inline] #3: (rcu_read_lock){....}, at: [<0000000091b6fc7b>] mld_sendpack+0x180/0xe70 net/ipv6/mcast.c:1625 #4: (rcu_read_lock){....}, at: [<000000002b6b177a>] nf_hook.constprop.37+0x0/0x830 net/ipv6/mcast.c:2795 stack backtrace: CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted 4.16.0-rc1+ #232 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient htable_gc Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_unlock_imbalance_bug+0x12f/0x140 kernel/locking/lockdep.c:3484 __lock_release kernel/locking/lockdep.c:3691 [inline] lock_release+0x6fe/0xa40 kernel/locking/lockdep.c:3939 rcu_lock_release include/linux/rcupdate.h:249 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:724 [inline] hashlimit_mt_common.isra.10+0x1c08/0x2610 net/netfilter/xt_hashlimit.c:777 hashlimit_mt+0x78/0x90 net/netfilter/xt_hashlimit.c:846 ip6t_do_table+0x98d/0x1a30 net/ipv6/netfilter/ip6_tables.c:319 ip6table_raw_hook+0x65/0x80 net/ipv6/netfilter/ip6table_raw.c:42 nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline] nf_hook_slow+0xba/0x1a0 net/netfilter/core.c:483 nf_hook.constprop.37+0x3f6/0x830 include/linux/netfilter.h:243 NF_HOOK include/linux/netfilter.h:286 [inline] mld_sendpack+0x6c2/0xe70 net/ipv6/mcast.c:1658 mld_send_initial_cr.part.25+0x103/0x150 net/ipv6/mcast.c:2075 mld_send_initial_cr net/ipv6/mcast.c:2059 [inline] mld_dad_timer_expire+0x31/0x100 net/ipv6/mcast.c:2093 call_timer_fn+0x228/0x820 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x7ee/0xb70 kernel/time/timer.c:1666 run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1cc/0x200 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:541 [inline] smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline] RIP: 0010:lock_is_held_type+0x18b/0x210 kernel/locking/lockdep.c:3960 RSP: 0018:ffff8801d98673e8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff12 RAX: dffffc0000000000 RBX: 0000000000000282 RCX: 0000000000000006 RDX: 1ffffffff0d592cd RSI: ffffffff86b42680 RDI: 0000000000000282 RBP: ffff8801d9867408 R08: 1ffff1003b30ce5b R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d9854640 R13: 0000000000000000 R14: 000000000000017d R15: 0000000000000000 lock_is_held include/linux/lockdep.h:344 [inline] ___might_sleep+0x39b/0x470 kernel/sched/core.c:6093 htable_selective_cleanup+0x29c/0x3d0 net/netfilter/xt_hashlimit.c:381 htable_gc+0x2e/0xc0 net/netfilter/xt_hashlimit.c:391 process_one_work+0xbbf/0x1af0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:429