------------[ cut here ]------------
WARNING: CPU: 0 PID: 19876 at kernel/locking/lockdep.c:4816 remove_class_from_lock_chain kernel/locking/lockdep.c:4796 [inline]
WARNING: CPU: 0 PID: 19876 at kernel/locking/lockdep.c:4816 remove_class_from_lock_chains kernel/locking/lockdep.c:4836 [inline]
WARNING: CPU: 0 PID: 19876 at kernel/locking/lockdep.c:4816 zap_class+0x76b/0xe60 kernel/locking/lockdep.c:4876
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 19876 Comm: syz-executor.2 Not tainted 5.6.0-rc1-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:4816 [inline]
RIP: 0010:remove_class_from_lock_chains kernel/locking/lockdep.c:4836 [inline]
RIP: 0010:zap_class+0x76b/0xe60 kernel/locking/lockdep.c:4876
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 2a f0 59 00 e9 6b ff ff ff <0f> 0b e8 6e 5d 45 02 e9 4e fb ff ff 48 89 4d a8 48 89 55 c0 e8 4c
RSP: 0018:ffffc90006c37b90 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8b091d60 RCX: 0000000000007e49
RDX: 0000000000000000 RSI: ffffffff83a17f3a RDI: 0000000000000006
RBP: ffffc90006c37bf8 R08: ffff88805fa4a300 R09: fffffbfff16a2f65
R10: fffffbfff16a2f64 R11: ffffffff8b517b27 R12: ffffffff8b50cd08
R13: ffffffff8b0a5728 R14: dffffc0000000000 R15: ffffffff8b0a5720
 __lockdep_free_key_range+0x64/0x120 kernel/locking/lockdep.c:4999
 lockdep_unregister_key+0x201/0x4c0 kernel/locking/lockdep.c:5191
 netdev_unregister_lockdep_key net/core/dev.c:9248 [inline]
 free_netdev+0x327/0x4e0 net/core/dev.c:9905
 netdev_run_todo+0x64a/0x7d0 net/core/dev.c:9647
 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:3459
 __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
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 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+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x416261
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:0000000000c7fbf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416261
RDX: 0000001b2c120000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00000000ada49e48 R09: 00000000ad0cfba3
R10: 0000000000c7fcd0 R11: 0000000000000293 R12: 000000000076c9a0
R13: 000000000076c9a0 R14: 0000000000770c20 R15: 000000000076c124
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..