------------[ cut here ]------------
WARNING: CPU: 0 PID: 28378 at kernel/locking/lockdep.c:4816 remove_class_from_lock_chain kernel/locking/lockdep.c:4796 [inline]
WARNING: CPU: 0 PID: 28378 at kernel/locking/lockdep.c:4816 remove_class_from_lock_chains kernel/locking/lockdep.c:4836 [inline]
WARNING: CPU: 0 PID: 28378 at kernel/locking/lockdep.c:4816 zap_class+0x763/0xe50 kernel/locking/lockdep.c:4876
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 28378 Comm: syz-executor.1 Not tainted 5.6.0-rc5-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
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x35 kernel/panic.c:582
 report_bug+0x27b/0x2f0 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+0x12b/0x220 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 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+0x763/0xe50 kernel/locking/lockdep.c:4876
Code: c1 e8 03 42 0f b6 14 28 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 02 18 57 00 e9 6b ff ff ff <0f> 0b e8 26 5b 34 02 e9 4f fb ff ff 48 89 54 24 20 48 89 4c 24 08
RSP: 0018:ffffc9000562fc00 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8c0541f8 RCX: ffffffff838de248
RDX: 000000000000515e RSI: ffffffff838de294 RDI: 0000000000000006
RBP: ffffffff8ba1e660 R08: ffff88804394c380 R09: fffffbfff180e16d
R10: fffffbfff180e16c R11: ffffffff8c070b67 R12: ffffffff8c04f5f0
R13: dffffc0000000000 R14: ffffffff8bbfe200 R15: ffffffff8bbfe208
 __lockdep_free_key_range+0x56/0x110 kernel/locking/lockdep.c:4999
 lockdep_unregister_key+0x1f7/0x490 kernel/locking/lockdep.c:5191
 netdev_unregister_lockdep_key net/core/dev.c:9238 [inline]
 free_netdev+0x316/0x4d0 net/core/dev.c:9895
 netdev_run_todo+0x5fc/0x760 net/core/dev.c:9637
 tun_detach drivers/net/tun.c:743 [inline]
 tun_chr_close+0xf5/0x180 drivers/net/tun.c:3459
 __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_32_irqs_on arch/x86/entry/common.c:352 [inline]
 do_fast_syscall_32+0xbef/0xe8f arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Kernel Offset: disabled
Rebooting in 86400 seconds..