BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 2361 Comm: syz-executor.2 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
 lock_timer_base+0x55/0x1a0 kernel/time/timer.c:936
 __mod_timer kernel/time/timer.c:1008 [inline]
 mod_timer kernel/time/timer.c:1100 [inline]
 add_timer+0xef/0x830 kernel/time/timer.c:1136
 __queue_delayed_work+0x1a5/0x270 kernel/workqueue.c:1646
 queue_delayed_work_on+0x1a2/0x210 kernel/workqueue.c:1671
 queue_delayed_work include/linux/workqueue.h:522 [inline]
 schedule_delayed_work include/linux/workqueue.h:626 [inline]
 kfree_call_rcu+0x335/0x400 kernel/rcu/tree.c:2872
 __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+0x5a6/0x2270 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:8826
 rollback_registered+0xf2/0x1c0 net/core/dev.c:8871
 unregister_netdevice_queue net/core/dev.c:9967 [inline]
 unregister_netdevice_queue+0x1d7/0x2b0 net/core/dev.c:9960
 unregister_netdevice include/linux/netdevice.h:2725 [inline]
 __tun_detach+0xe42/0x1110 drivers/net/tun.c:690
 tun_detach drivers/net/tun.c:707 [inline]
 tun_chr_close+0xd9/0x180 drivers/net/tun.c:3410
 __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: 0033:0x45c849
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3359235c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f33592366d4 RCX: 000000000045c849
RDX: 0000000020000000 RSI: 00000000400454ca RDI: 0000000000000004
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000005a1 R14: 00000000004c83a9 R15: 000000000076bf0c