BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 27216 Comm: syz-executor249 Not tainted 5.6.0-rc7-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
 ipv6_mc_destroy_dev+0x1a/0x160 net/ipv6/mcast.c:2603
 addrconf_ifdown+0xd8a/0x12f0 net/ipv6/addrconf.c:3848
 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]
 rollback_registered_many+0x75c/0xe70 net/core/dev.c:8810
 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
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xb34/0x2dd0 kernel/exit.c:801
 do_group_exit+0x125/0x340 kernel/exit.c:899
 __do_sys_exit_group kernel/exit.c:910 [inline]
 __se_sys_exit_group kernel/exit.c:908 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:908
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440618
Code: 00 00 be 3c 00 00 00 eb 19 66 0f 1f 84 00 00 00 00 00 48 89 d7 89 f0 0f 05 48 3d 00 f0 ff ff 77 21 f4 48 89 d7 44 89 c0 0f 05 <48> 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 0f 1f 84 00 00 00
RSP: 002b:00007fff113a2c88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440618
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004c0750 R08: 00000000000000e7 R09: ffffffffffffffd4
R10: 00000000004027b0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d3180 R14: 0000000000000000 R15: 0000000000000000