BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 PID: 25284 Comm: syz-executor.3 Not tainted 5.6.0-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+0x188/0x20d lib/dump_stack.c:118
 add_chain_cache kernel/locking/lockdep.c:2840 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:2914 [inline]
 validate_chain kernel/locking/lockdep.c:2935 [inline]
 __lock_acquire.cold+0x263/0x288 kernel/locking/lockdep.c:3954
 lock_acquire+0x197/0x420 kernel/locking/lockdep.c:4484
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:159
 debug_object_activate+0x131/0x470 lib/debugobjects.c:636
 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline]
 kfree_call_rcu+0x107/0x400 kernel/rcu/tree.c:2858
 __hw_addr_del_entry net/core/dev_addr_lists.c:107 [inline]
 __hw_addr_del_entry+0x2dd/0x3b0 net/core/dev_addr_lists.c:88
 __hw_addr_del_ex+0x129/0x150 net/core/dev_addr_lists.c:121
 __dev_mc_del+0x74/0xd0 net/core/dev_addr_lists.c:806
 igmp6_group_dropped+0x2f5/0x9b0 net/ipv6/mcast.c:708
 ipv6_mc_down+0x5c/0x120 net/ipv6/mcast.c:2541
 addrconf_ifdown+0xe7a/0x12f0 net/ipv6/addrconf.c:3850
 addrconf_notify+0x5cd/0x2310 net/ipv6/addrconf.c:3639
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83
 call_netdevice_notifiers_info net/core/dev.c:1948 [inline]
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933
 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline]
 call_netdevice_notifiers net/core/dev.c:1974 [inline]
 dev_close_many+0x2f5/0x620 net/core/dev.c:1549
 rollback_registered_many+0x3ad/0xe70 net/core/dev.c:8787
 rollback_registered+0xf2/0x1c0 net/core/dev.c:8855
 unregister_netdevice_queue net/core/dev.c:9947 [inline]
 unregister_netdevice_queue+0x1d7/0x2b0 net/core/dev.c:9940
 unregister_netdevice include/linux/netdevice.h:2715 [inline]
 __tun_detach+0xe4d/0x1120 drivers/net/tun.c:723
 tun_detach drivers/net/tun.c:740 [inline]
 tun_chr_close+0xd9/0x180 drivers/net/tun.c:3459
 __fput+0x2da/0x850 fs/file_table.c:280
 task_work_run+0x13f/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x2fa/0x360 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4163e1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffe745e1270 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00000000004163e1
RDX: 0000000000000000 RSI: 000000000000119c RDI: 0000000000000005
RBP: 0000000000000001 R08: 00000000f36791a0 R09: 00ffffffffffffff
R10: 00007ffe745e1350 R11: 0000000000000293 R12: 000000000076c900
R13: 000000000076c900 R14: 0000000000282e06 R15: 000000000076bfac