BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 PID: 28285 Comm: syz-executor161 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+0x1e9/0x30e lib/dump_stack.c:118
 add_chain_cache kernel/locking/lockdep.c:442 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:2914 [inline]
 validate_chain+0x3e6b/0x7be0 kernel/locking/lockdep.c:2935
 __lock_acquire+0xc5a/0x1bc0 kernel/locking/lockdep.c:3954
 lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:343 [inline]
 netif_addr_lock_bh include/linux/netdevice.h:4162 [inline]
 __dev_mc_del+0x35/0x410 net/core/dev_addr_lists.c:805
 igmp6_group_dropped+0x14e/0xca0 net/ipv6/mcast.c:708
 ipv6_mc_down+0x6d/0x270 net/ipv6/mcast.c:2541
 ipv6_mc_destroy_dev+0x28/0x280 net/ipv6/mcast.c:2603
 addrconf_ifdown+0x12f0/0x1690 net/ipv6/addrconf.c:3848
 addrconf_notify+0x407/0x3ad0 net/ipv6/addrconf.c:3639
 notifier_call_chain kernel/notifier.c:83 [inline]
 __raw_notifier_call_chain kernel/notifier.c:361 [inline]
 raw_notifier_call_chain+0xd4/0x170 kernel/notifier.c:368
 call_netdevice_notifiers_info net/core/dev.c:1948 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline]
 call_netdevice_notifiers net/core/dev.c:1974 [inline]
 rollback_registered_many+0xbc3/0x1450 net/core/dev.c:8810
 rollback_registered net/core/dev.c:8855 [inline]
 unregister_netdevice_queue+0x2bb/0x470 net/core/dev.c:9947
 unregister_netdevice include/linux/netdevice.h:2715 [inline]
 __tun_detach+0x11c4/0x1bc0 drivers/net/tun.c:723
 tun_detach drivers/net/tun.c:740 [inline]
 tun_chr_close+0xed/0x130 drivers/net/tun.c:3459
 __fput+0x2d8/0x730 fs/file_table.c:280
 task_work_run+0x176/0x1b0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x5ef/0x1f80 kernel/exit.c:801
 do_group_exit+0x15e/0x2c0 kernel/exit.c:899
 __do_sys_exit_group+0x13/0x20 kernel/exit.c:910
 __se_sys_exit_group+0x10/0x10 kernel/exit.c:908
 __x64_sys_exit_group+0x37/0x40 kernel/exit.c:908
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x43fee8
Code: Bad RIP value.
RSP: 002b:00007fff23297aa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043fee8
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004bf730 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000