------------[ cut here ]------------ Illegal XDP return value 4294967274, expect packet loss! WARNING: CPU: 1 PID: 1074 at net/core/filter.c:5537 bpf_warn_invalid_xdp_action net/core/filter.c:5537 [inline] WARNING: CPU: 1 PID: 1074 at net/core/filter.c:5537 bpf_warn_invalid_xdp_action+0x6f/0x80 net/core/filter.c:5533 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 1074 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x5a kernel/panic.c:541 report_bug+0x262/0x2b0 lib/bug.c:183 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:bpf_warn_invalid_xdp_action net/core/filter.c:5537 [inline] RIP: 0010:bpf_warn_invalid_xdp_action+0x6f/0x80 net/core/filter.c:5533 Code: e0 4a 4d 89 41 83 fc 04 48 c7 c6 20 4b 4d 89 48 0f 46 ee e8 53 5c e3 fa 44 89 e2 48 c7 c7 60 4b 4d 89 48 89 ee e8 26 94 73 01 <0f> 0b 5b 5d 41 5c e9 36 5c e3 fa 66 0f 1f 44 00 00 41 54 55 89 fd RSP: 0018:ffff8880ba107a00 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff814dff01 RDI: ffffed1017420f32 RBP: ffffffff894d4ae0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 00000000ffffffea R13: 0000000000000001 R14: 0000000000000000 R15: ffff8880ba107b00 netif_receive_generic_xdp+0xcab/0x1540 net/core/dev.c:4390 do_xdp_generic.part.0+0x80/0x1a0 net/core/dev.c:4439 do_xdp_generic net/core/dev.c:4808 [inline] __netif_receive_skb_core+0xd00/0x3270 net/core/dev.c:4808 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:4952 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066 process_backlog+0x241/0x700 net/core/dev.c:5849 napi_poll net/core/dev.c:6280 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6346 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 call_function_single_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:916 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:enqueue_to_backlog+0xb59/0xe00 net/core/dev.c:4242 Code: fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 6a 02 00 00 48 83 3d 70 c1 7c 03 00 0f 84 17 01 00 00 e8 4d c4 ed fa 48 8b 3c 24 57 9d <0f> 1f 44 00 00 45 31 e4 e9 0c f7 ff ff e8 35 c4 ed fa 0f 0b e8 2e RSP: 0018:ffff88805f2cf6e0 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff04 RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc90007b2f000 RDX: 0000000000000442 RSI: ffffffff8674c123 RDI: 0000000000000212 RBP: 00000000000068b5 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ba12c490 R13: ffff8880ba12c478 R14: ffff8880ba12c478 R15: ffff8880ba12c308 netif_rx_internal+0xfd/0x670 net/core/dev.c:4491 __bpf_rx_skb_no_mac net/core/filter.c:1995 [inline] __bpf_redirect_no_mac net/core/filter.c:2040 [inline] __bpf_redirect+0x49d/0xbc0 net/core/filter.c:2063 ____bpf_clone_redirect net/core/filter.c:2094 [inline] bpf_clone_redirect+0x2c0/0x430 net/core/filter.c:2066 ___bpf_prog_run+0x1bfa/0x4e80 kernel/bpf/core.c:1184 Kernel Offset: disabled Rebooting in 86400 seconds.. ---------------- Code disassembly (best guess), 2 bytes skipped: 0: df 48 c1 fisttps -0x3f(%rax) 3: e8 03 80 3c 10 callq 0x103c800b 8: 00 0f add %cl,(%rdi) a: 85 6a 02 test %ebp,0x2(%rdx) d: 00 00 add %al,(%rax) f: 48 83 3d 70 c1 7c 03 cmpq $0x0,0x37cc170(%rip) # 0x37cc187 16: 00 17: 0f 84 17 01 00 00 je 0x134 1d: e8 4d c4 ed fa callq 0xfaedc46f 22: 48 8b 3c 24 mov (%rsp),%rdi 26: 57 push %rdi 27: 9d popfq * 28: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 2d: 45 31 e4 xor %r12d,%r12d 30: e9 0c f7 ff ff jmpq 0xfffff741 35: e8 35 c4 ed fa callq 0xfaedc46f 3a: 0f 0b ud2 3c: e8 .byte 0xe8 3d: 2e cs