IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready ===================================== WARNING: bad unlock balance detected! 4.16.0-rc2+ #323 Not tainted ------------------------------------- syzkaller216442/4169 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 syzkaller216442/4169: #0: (&xt[i].mutex){+.+.}, at: [<00000000801e7685>] xt_find_table_lock+0x3e/0x3e0 net/netfilter/x_tables.c:1046 #1: (&mm->mmap_sem){++++}, at: [<00000000c12750ac>] __do_page_fault+0x32d/0xc90 arch/x86/mm/fault.c:1355 #2: ((&idev->mc_ifc_timer)){+.-.}, at: [<000000005a0acd53>] lockdep_copy_map include/linux/lockdep.h:178 [inline] #2: ((&idev->mc_ifc_timer)){+.-.}, at: [<000000005a0acd53>] call_timer_fn+0x1c6/0x820 kernel/time/timer.c:1316 #3: (rcu_read_lock){....}, at: [<00000000902072d7>] read_pnet include/net/net_namespace.h:280 [inline] #3: (rcu_read_lock){....}, at: [<00000000902072d7>] dev_net include/linux/netdevice.h:2050 [inline] #3: (rcu_read_lock){....}, at: [<00000000902072d7>] mld_sendpack+0x180/0xe70 net/ipv6/mcast.c:1625 #4: (rcu_read_lock){....}, at: [<000000007c5af173>] nf_hook.constprop.37+0x0/0x830 net/ipv6/mcast.c:2795 stack backtrace: CPU: 0 PID: 4169 Comm: syzkaller216442 Not tainted 4.16.0-rc2+ #323 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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_cr net/ipv6/mcast.c:1954 [inline] mld_ifc_timer_expire+0x3d9/0x770 net/ipv6/mcast.c:2451 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+0x8e/0xa0 arch/x86/entry/entry_64.S:796 RIP: 0010:___might_sleep+0x15/0x470 kernel/sched/core.c:6091 RSP: 0018:ffff8801b15e7030 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12 RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffffffff819dd382 RDX: 0000000000000000 RSI: 0000000000001205 RDI: ffffffff85f0dca0 RBP: ffff8801b15e7050 R08: 000000000002fc50 R09: 0000000000000000 R10: ffffffffffffffe8 R11: 0000000000000000 R12: ffffea0006e40000 R13: 0000000000000092 R14: 0000000000000049 R15: 00000000000001ea clear_huge_page+0xa5/0x730 mm/memory.c:4613 __do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline] do_huge_pmd_anonymous_page+0x599/0x1b00 mm/huge_memory.c:728 create_huge_pmd mm/memory.c:3870 [inline] __handle_mm_fault+0x1a0c/0x3ce0 mm/memory.c:4074 handle_mm_fault+0x35c/0x970 mm/memory.c:4140 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1426 do_page_fault+0xee/0x730 arch/x86/mm/fault.c:1501 page_fault+0x62/0x90 arch/x86/entry/entry_64.S:1122 RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:66 RSP: 0018:ffff8801b15e79b8 EFLAGS: 00010206 RAX: fffff5200027b806 RBX: 0000000000000030 RCX: 0000000000000006 RDX: 0000000000000000 RSI: ffffc900013dc000 RDI: 0000000020849fd0 RBP: ffff8801b15e79e8 R08: 0000000000000000 R09: fffff5200027b806 R10: 0000000000000006 R11: fffff5200027b805 R12: 0000000020849fd0 R13: ffffc900013dc000 R14: 00007ffffffff000 R15: 000000002084a000 copy_to_user include/linux/uaccess.h:155 [inline] __do_replace+0x840/0xa70 net/ipv6/netfilter/ip6_tables.c:1111 do_replace net/ipv6/netfilter/ip6_tables.c:1164 [inline] do_ip6t_set_ctl+0x40f/0x5f0 net/ipv6/netfilter/ip6_tables.c:1686 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x10b/0x130 net/ipv6/ipv6_sockglue.c:927 rawv6_setsockopt+0x4a/0xf0 net/ipv6/raw.c:1060 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x44ca19 RSP: 002b:00007ffe05efab38 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00000000004ae824 RCX: 000000000044ca19 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000004 RBP: 00007ffe05efabd8 R08: 00000000000