------------[ cut here ]------------ lockdep bfs error:-1 WARNING: CPU: 0 PID: 15547 at kernel/locking/lockdep.c:1960 print_bfs_bug+0x130/0x1e0 kernel/locking/lockdep.c:1960 Modules linked in: CPU: 0 PID: 15547 Comm: syz-executor.3 Not tainted 5.9.0-rc7-next-20200930-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:print_bfs_bug+0x130/0x1e0 kernel/locking/lockdep.c:1960 Code: e2 08 00 74 2c 48 c7 c7 c0 7f a6 8d e8 49 51 01 00 66 90 85 db 75 05 5b 5d 41 5c c3 89 ee 48 c7 c7 20 e8 ab 88 e8 7b e5 c0 06 <0f> 0b 5b 5d 41 5c c3 0f 0b e8 62 82 e9 06 85 c0 74 d7 48 c7 c0 38 RSP: 0018:ffffc90001a76718 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff815df1a5 RDI: fffff5200034ecd5 RBP: 00000000ffffffff R08: 0000000000000001 R09: ffff8880ae420f8b R10: 0000000000000000 R11: 207065646b636f6c R12: ffff8880438a8200 R13: dffffc0000000000 R14: 0000000000000005 R15: 0000000000000000 FS: 00007fecb6101700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000118c000 CR3: 000000004782b000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: check_irq_usage+0x6b4/0xc60 kernel/locking/lockdep.c:2585 check_prev_add kernel/locking/lockdep.c:2823 [inline] check_prevs_add kernel/locking/lockdep.c:2944 [inline] validate_chain kernel/locking/lockdep.c:3562 [inline] __lock_acquire+0x2873/0x56d0 kernel/locking/lockdep.c:4796 lock_acquire+0x1f2/0xaa0 kernel/locking/lockdep.c:5398 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 alloc_object lib/debugobjects.c:239 [inline] __debug_object_init+0x5c6/0xd10 lib/debugobjects.c:548 debug_object_init lib/debugobjects.c:595 [inline] debug_object_activate+0x32c/0x3e0 lib/debugobjects.c:681 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] __call_rcu kernel/rcu/tree.c:2943 [inline] call_rcu+0x2c/0x7d0 kernel/rcu/tree.c:3030 dst_release net/core/dst.c:179 [inline] dst_release+0x79/0xe0 net/core/dst.c:169 refdst_drop include/net/dst.h:258 [inline] skb_dst_drop include/net/dst.h:270 [inline] skb_release_head_state+0x1f9/0x250 net/core/skbuff.c:648 skb_release_all net/core/skbuff.c:662 [inline] __kfree_skb net/core/skbuff.c:678 [inline] kfree_skb net/core/skbuff.c:696 [inline] kfree_skb+0xfa/0x3f0 net/core/skbuff.c:690 ip_tunnel_xmit+0x6b5/0x2b00 net/ipv4/ip_tunnel.c:826 ipip_tunnel_xmit+0x406/0x500 net/ipv4/ipip.c:305 __netdev_start_xmit include/linux/netdevice.h:4698 [inline] netdev_start_xmit include/linux/netdevice.h:4712 [inline] xmit_one net/core/dev.c:3562 [inline] dev_hard_start_xmit+0x188/0x880 net/core/dev.c:3578 __dev_queue_xmit+0x2062/0x2d30 net/core/dev.c:4137 neigh_connected_output+0x299/0x370 net/core/neighbour.c:1518 neigh_output include/net/neighbour.h:509 [inline] ip_finish_output2+0x818/0x2190 net/ipv4/ip_output.c:230 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x7cf/0xd10 net/ipv4/ip_output.c:290 ip_finish_output+0x34/0x1f0 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0x196/0x310 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:443 [inline] ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x5a3/0x9c0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1b78/0x2b00 net/ipv4/ip_tunnel.c:816 ipgre_xmit+0x651/0x9f0 net/ipv4/ip_gre.c:650 __netdev_start_xmit include/linux/netdevice.h:4698 [inline] netdev_start_xmit include/linux/netdevice.h:4712 [inline] xmit_one net/core/dev.c:3562 [inline] dev_hard_start_xmit+0x188/0x880 net/core/dev.c:3578 __dev_queue_xmit+0x2062/0x2d30 net/core/dev.c:4137 __bpf_tx_skb net/core/filter.c:2115 [inline] __bpf_redirect_no_mac net/core/filter.c:2140 [inline] __bpf_redirect+0x52e/0xc60 net/core/filter.c:2163 ____bpf_clone_redirect net/core/filter.c:2194 [inline] bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2166 bpf_prog_bebbfe2050753572+0x56/0xf44 bpf_dispatcher_nop_func include/linux/bpf.h:640 [inline] bpf_test_run+0x3be/0xcf0 net/bpf/test_run.c:50 bpf_prog_test_run_skb+0xabc/0x1c50 net/bpf/test_run.c:584 bpf_prog_test_run kernel/bpf/syscall.c:3126 [inline] __do_sys_bpf+0x1b11/0x5130 kernel/bpf/syscall.c:4416 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45dd99 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fecb6100c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000001780 RCX: 000000000045dd99 RDX: 0000000000000040 RSI: 0000000020000080 RDI: 000000000000000a RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffca83c1cef R14: 00007fecb61019c0 R15: 000000000118bf2c