------------[ cut here ]------------
lockdep bfs error:-1
WARNING: CPU: 0 PID: 11991 at kernel/locking/lockdep.c:1714 print_bfs_bug+0x130/0x1e0 kernel/locking/lockdep.c:1714
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 11991 Comm: kworker/u4:2 Not tainted 5.7.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
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:105 [inline]
 fixup_bug arch/x86/kernel/traps.c:100 [inline]
 do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:197
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:216
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:print_bfs_bug+0x130/0x1e0 kernel/locking/lockdep.c:1714
Code: 3b 08 00 74 2c 48 c7 c7 80 6f 65 8c e8 b9 89 01 00 66 90 85 db 75 05 5b 5d 41 5c c3 89 ee 48 c7 c7 20 a3 2b 88 e8 48 be eb ff <0f> 0b 5b 5d 41 5c c3 0f 0b e8 62 3c 81 06 85 c0 74 d7 48 c7 c0 10
RSP: 0018:ffffc9000464f5c0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815d29a7 RDI: fffff520008c9eaa
RBP: 00000000ffffffff R08: ffff8880a97e63c0 R09: ffffed1015cc45f2
R10: ffff8880ae622f8b R11: ffffed1015cc45f1 R12: ffff8880a97e63c0
R13: ffff8880a97e6d08 R14: ffffc9000464f640 R15: 00000000000003f1
 check_path+0x36/0x40 kernel/locking/lockdep.c:1790
 check_noncircular+0x16d/0x3e0 kernel/locking/lockdep.c:1815
 check_prev_add kernel/locking/lockdep.c:2496 [inline]
 check_prevs_add kernel/locking/lockdep.c:2601 [inline]
 validate_chain kernel/locking/lockdep.c:3218 [inline]
 __lock_acquire+0x2a9c/0x4a70 kernel/locking/lockdep.c:4380
 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4959
 __mutex_lock_common kernel/locking/mutex.c:956 [inline]
 __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103
 internal_dev_destroy+0x6f/0x150 net/openvswitch/vport-internal_dev.c:216
 __dp_destroy+0x32b/0x430 net/openvswitch/datapath.c:1755
 ovs_exit_net+0x266/0xba0 net/openvswitch/datapath.c:2474
 ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186
 cleanup_net+0x511/0xa50 net/core/net_namespace.c:603
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Kernel Offset: disabled
Rebooting in 86400 seconds..