------------[ cut here ]------------ lockdep bfs error:-1 WARNING: CPU: 0 PID: 26 at kernel/locking/lockdep.c:1733 print_bfs_bug+0x138/0x1d0 kernel/locking/lockdep.c:1733 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 26 Comm: kworker/u4:2 Not tainted 5.7.0-rc2-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+0x128/0x182 lib/dump_stack.c:118 panic+0x22a/0x4e3 kernel/panic.c:221 __warn.cold.10+0x25/0x26 kernel/panic.c:582 report_bug+0x1ad/0x270 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:175 [inline] do_error_trap+0x123/0x210 arch/x86/kernel/traps.c:267 do_invalid_op+0x31/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:print_bfs_bug+0x138/0x1d0 kernel/locking/lockdep.c:1733 Code: 07 00 74 2d 48 c7 c7 00 00 8a 8b e8 c2 6a 01 00 66 90 45 85 e4 75 05 5b 5d 41 5c c3 89 ee 48 c7 c7 80 d5 8a 87 e8 54 30 ed ff <0f> 0b 5b 5d 41 5c c3 0f 0b e8 da 6a f8 01 85 c0 74 d6 48 c7 c7 10 RSP: 0018:ffffc90000e276a0 EFLAGS: 00010082 RAX: 0000000000000000 RBX: ffff8880a943c040 RCX: 0000000000000000 RDX: 0000000000000002 RSI: 0000000000000007 RDI: ffffffff8b8e41a0 RBP: 00000000ffffffff R08: ffffed1015d045f1 R09: ffffed1015d045f1 R10: ffff8880ae822f83 R11: ffffed1015d045f0 R12: 0000000000000001 R13: ffff8880a943c9d0 R14: ffff8880a943c9a8 R15: 0000000000000893 check_path+0x36/0x40 kernel/locking/lockdep.c:1809 check_noncircular+0x171/0x400 kernel/locking/lockdep.c:1834 check_prev_add kernel/locking/lockdep.c:2515 [inline] check_prevs_add kernel/locking/lockdep.c:2620 [inline] validate_chain kernel/locking/lockdep.c:3237 [inline] __lock_acquire+0x24be/0x3690 kernel/locking/lockdep.c:4355 lock_acquire+0x1e3/0x970 kernel/locking/lockdep.c:4934 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x153/0x13e0 kernel/locking/mutex.c:1103 nsim_destroy+0x24/0x60 drivers/net/netdevsim/netdev.c:329 __nsim_dev_port_del+0x126/0x1d0 drivers/net/netdevsim/dev.c:934 nsim_dev_port_del_all+0x73/0xc0 drivers/net/netdevsim/dev.c:947 nsim_dev_reload_destroy+0x54/0xe0 drivers/net/netdevsim/dev.c:1123 nsim_dev_reload_down+0x50/0xb0 drivers/net/netdevsim/dev.c:703 devlink_reload+0xa3/0x330 net/core/devlink.c:2797 devlink_pernet_pre_exit+0xdb/0x150 net/core/devlink.c:9282 ops_pre_exit_list net/core/net_namespace.c:176 [inline] cleanup_net+0x3d4/0x910 net/core/net_namespace.c:591 process_one_work+0x908/0x15d0 kernel/workqueue.c:2268 worker_thread+0x82/0xb50 kernel/workqueue.c:2414 kthread+0x340/0x410 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..