------------[ cut here ]------------
WARNING: CPU: 0 PID: 16353 at kernel/locking/lockdep.c:4817 remove_class_from_lock_chain kernel/locking/lockdep.c:4797 [inline]
WARNING: CPU: 0 PID: 16353 at kernel/locking/lockdep.c:4817 remove_class_from_lock_chains kernel/locking/lockdep.c:4837 [inline]
WARNING: CPU: 0 PID: 16353 at kernel/locking/lockdep.c:4817 zap_class+0x76b/0xe60 kernel/locking/lockdep.c:4877
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 16353 Comm: syz-executor.0 Not tainted 5.5.0-rc4-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+0x197/0x210 lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x3e kernel/panic.c:582
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:remove_class_from_lock_chain kernel/locking/lockdep.c:4817 [inline]
RIP: 0010:remove_class_from_lock_chains kernel/locking/lockdep.c:4837 [inline]
RIP: 0010:zap_class+0x76b/0xe60 kernel/locking/lockdep.c:4877
Code: c1 e8 03 42 0f b6 14 30 4c 89 e0 83 e0 07 83 c0 01 38 d0 7c 80 84 d2 0f 84 78 ff ff ff 4c 89 e7 e8 ea c0 58 00 e9 6b ff ff ff <0f> 0b e8 8e b9 32 02 e9 4e fb ff ff 48 89 4d a8 48 89 55 c0 e8 0c
RSP: 0018:ffffc900048d77e8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 7004fa8db4606c35 RCX: 0000000000006549
RDX: 0000000000000000 RSI: ffffffff838ebe7a RDI: 0000000000000006
RBP: ffffc900048d7850 R08: ffff8880a0452580 R09: fffffbfff1659b15
R10: fffffbfff1659b14 R11: ffffffff8b2cd8a7 R12: ffffffff8b2b4708
R13: ffffffff8ae102e8 R14: dffffc0000000000 R15: ffffffff8ae102e0
 __lockdep_free_key_range+0x64/0x120 kernel/locking/lockdep.c:5000
 lockdep_unregister_key+0x201/0x4c0 kernel/locking/lockdep.c:5192
 netdev_unregister_lockdep_key net/core/dev.c:9172 [inline]
 free_netdev+0x2d3/0x470 net/core/dev.c:9836
 netdev_run_todo+0x64a/0x7d0 net/core/dev.c:9581
 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:112
 tun_detach drivers/net/tun.c:743 [inline]
 tun_chr_close+0xfc/0x180 drivers/net/tun.c:3455
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x8e7/0x2ef0 kernel/exit.c:797
 do_group_exit+0x135/0x360 kernel/exit.c:895
 get_signal+0x47c/0x24f0 kernel/signal.c:2734
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a9e9
Code: bd 4c 00 00 b9 00 00 40 00 e8 b3 4c 00 00 90 cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 ff 00 00 00 48 83 ec 40 48 89 <6c> 24 38 48 8d 6c 24 38 48 8b 42 08 48 89 44 24 30 84 00 48 8b 4a
RSP: 002b:00007f437efb5cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 000000000045a9e9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c
R13: 00007ffd2adcf0ef R14: 00007f437efb69c0 R15: 000000000075bf2c
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..