------------[ cut here ]------------ Illegal XDP return value 4294967274, expect packet loss! WARNING: CPU: 1 PID: 5058 at net/core/filter.c:8188 bpf_warn_invalid_xdp_action net/core/filter.c:8188 [inline] WARNING: CPU: 1 PID: 5058 at net/core/filter.c:8188 bpf_warn_invalid_xdp_action+0x6f/0x80 net/core/filter.c:8184 Modules linked in: CPU: 1 PID: 5058 Comm: syz-executor.2 Not tainted 5.16.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bpf_warn_invalid_xdp_action net/core/filter.c:8188 [inline] RIP: 0010:bpf_warn_invalid_xdp_action+0x6f/0x80 net/core/filter.c:8184 Code: 80 77 ae 8a 41 83 fc 04 48 c7 c6 c0 77 ae 8a 48 0f 46 ee e8 a3 7f 42 fa 44 89 e2 48 c7 c7 00 78 ae 8a 48 89 ee e8 dd 5d cb 01 <0f> 0b 5b 5d 41 5c e9 86 7f 42 fa 66 0f 1f 44 00 00 41 57 41 56 49 RSP: 0018:ffffc90000dc0a58 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88802d0a1d00 RSI: ffffffff815f0948 RDI: fffff520001b813d RBP: ffffffff8aae7780 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff815ea6ee R11: 0000000000000000 R12: 00000000ffffffea R13: 00000000ffffffea R14: 00000000ffffffea R15: 00000000ffffff90 FS: 00007fc0a3216700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc0a49b4028 CR3: 00000000744aa000 CR4: 0000000000350ee0 Call Trace: netif_receive_generic_xdp net/core/dev.c:4830 [inline] do_xdp_generic.part.0+0x80b/0xa00 net/core/dev.c:4878 do_xdp_generic net/core/dev.c:4873 [inline] __netif_receive_skb_core+0x11b7/0x3770 net/core/dev.c:5286 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:5463 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5579 process_backlog+0x2a5/0x6c0 net/core/dev.c:6455 __napi_poll+0xaf/0x440 net/core/dev.c:7023 napi_poll net/core/dev.c:7090 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7177 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:enqueue_to_backlog+0x210/0x10c0 net/core/dev.c:4677 Code: 8b 5d 10 be 08 00 00 00 48 8d bb e0 01 00 00 e8 f6 e4 92 fa f0 48 ff 83 e0 01 00 00 48 89 ef 41 bd 01 00 00 00 e8 70 e7 f9 ff 4b 22 4c fa 44 89 e8 48 83 c4 30 5b 5d 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc90004e3f610 EFLAGS: 00000216 RAX: 0000000000000934 RBX: 0000000000000000 RCX: ffffc90002d51000 RDX: 0000000000040000 RSI: ffffffff872b72eb RDI: 0000000000000003 RBP: 0000000000000e09 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff872b72dd R11: 0000000000000000 R12: 0000000000000200 R13: 0000000000000000 R14: ffff8880b9d3ad38 R15: ffff8880b9d3ad38 netif_rx_internal+0x120/0x640 net/core/dev.c:4930 dev_forward_skb_nomtu+0x45/0x60 net/core/dev.c:2208 __bpf_rx_skb net/core/filter.c:2084 [inline] __bpf_redirect_common net/core/filter.c:2153 [inline] __bpf_redirect+0x1c5/0xd20 net/core/filter.c:2160 ____bpf_clone_redirect net/core/filter.c:2429 [inline] bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2401 bpf_prog_4f760394faa40cf9+0x59/0x9f8 bpf_dispatcher_nop_func include/linux/bpf.h:727 [inline] __bpf_prog_run include/linux/filter.h:626 [inline] bpf_prog_run include/linux/filter.h:633 [inline] bpf_test_run+0x381/0x980 net/bpf/test_run.c:120 bpf_prog_test_run_skb+0xb32/0x1dd0 net/bpf/test_run.c:666 bpf_prog_test_run kernel/bpf/syscall.c:3349 [inline] __sys_bpf+0x1823/0x5950 kernel/bpf/syscall.c:4651 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4735 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc0a48a0e99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc0a3216168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fc0a49b3f60 RCX: 00007fc0a48a0e99 RDX: 0000000000000028 RSI: 0000000020000080 RDI: 000000000000000a RBP: 00007fc0a48faff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff7203ee1f R14: 00007fc0a3216300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 8b 5d 10 mov 0x10(%rbp),%ebx 3: be 08 00 00 00 mov $0x8,%esi 8: 48 8d bb e0 01 00 00 lea 0x1e0(%rbx),%rdi f: e8 f6 e4 92 fa callq 0xfa92e50a 14: f0 48 ff 83 e0 01 00 lock incq 0x1e0(%rbx) 1b: 00 1c: 48 89 ef mov %rbp,%rdi 1f: 41 bd 01 00 00 00 mov $0x1,%r13d 25: e8 70 e7 f9 ff callq 0xfff9e79a * 2a: e8 4b 22 4c fa callq 0xfa4c227a <-- trapping instruction 2f: 44 89 e8 mov %r13d,%eax 32: 48 83 c4 30 add $0x30,%rsp 36: 5b pop %rbx 37: 5d pop %rbp 38: 41 5c pop %r12 3a: 41 5d pop %r13 3c: 41 5e pop %r14 3e: 41 5f pop %r15