BUG: MAX_LOCKDEP_KEYS too low! turning off the locking correctness validator. CPU: 0 PID: 12434 Comm: syz-executor.4 Not tainted 5.7.0-rc7-next-20200529-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 register_lock_class.cold+0x11/0x19 kernel/locking/lockdep.c:1238 __lock_acquire+0xff/0x48b0 kernel/locking/lockdep.c:4259 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4959 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:358 [inline] netif_addr_lock_bh include/linux/netdevice.h:4244 [inline] __dev_mc_add+0x28/0xd0 net/core/dev_addr_lists.c:765 igmp6_group_added+0x375/0x420 net/ipv6/mcast.c:669 __ipv6_dev_mc_inc+0x80d/0xc90 net/ipv6/mcast.c:928 ipv6_add_dev net/ipv6/addrconf.c:456 [inline] ipv6_add_dev+0x99d/0x1090 net/ipv6/addrconf.c:364 addrconf_notify+0x8b9/0x2300 net/ipv6/addrconf.c:3462 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:2016 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2001 call_netdevice_notifiers_extack net/core/dev.c:2028 [inline] call_netdevice_notifiers net/core/dev.c:2042 [inline] register_netdevice+0xd70/0x10b0 net/core/dev.c:9523 veth_newlink+0x41e/0xa10 drivers/net/veth.c:1370 __rtnl_newlink+0xf16/0x1590 net/core/rtnetlink.c:3340 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e6/0x810 net/socket.c:2352 ___sys_sendmsg+0x100/0x170 net/socket.c:2406 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca69 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f778846cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000500f80 RCX: 000000000045ca69 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a04 R14: 00000000004cce0c R15: 00007f778846d6d4