------------[ cut here ]------------ Illegal XDP return value 4294967274, expect packet loss! WARNING: CPU: 1 PID: 499 at net/core/filter.c:8188 bpf_warn_invalid_xdp_action net/core/filter.c:8188 [inline] WARNING: CPU: 1 PID: 499 at net/core/filter.c:8188 bpf_warn_invalid_xdp_action+0x6f/0x80 net/core/filter.c:8184 Modules linked in: CPU: 1 PID: 499 Comm: syz-executor.0 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: a0 f7 ad 8a 41 83 fc 04 48 c7 c6 e0 f7 ad 8a 48 0f 46 ee e8 23 bb 41 fa 44 89 e2 48 c7 c7 20 f8 ad 8a 48 89 ee e8 d7 5d cb 01 <0f> 0b 5b 5d 41 5c e9 06 bb 41 fa 66 0f 1f 44 00 00 41 57 41 56 49 RSP: 0018:ffffc90000fd8a58 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88802c4a4240 RSI: ffffffff815e3a18 RDI: fffff520001fb13d RBP: ffffffff8aadf7a0 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff815dd7be R11: 0000000000000000 R12: 00000000ffffffea R13: 00000000ffffffea R14: 00000000ffffffea R15: 00000000ffffff8e FS: 00007f5da0571700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30f23000 CR3: 0000000077b1c000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 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:kmalloc_slab+0x5d/0xe0 mm/slab_common.c:742 Code: 89 eb 81 e3 11 00 40 00 75 41 89 db 48 83 fb 03 77 68 41 83 fc 16 44 89 e5 77 4e 48 6b db 17 48 01 eb 48 8b 04 dd 40 c0 55 8b <5b> 5d 41 5c c3 48 81 ff 00 00 40 00 77 2b 83 ef 01 41 bc ff ff ff RSP: 0018:ffffc900032b7538 EFLAGS: 00000206 RAX: ffff888010c40600 RBX: 0000000000000009 RCX: ffffffff872616d7 RDX: 00000000ffffffff RSI: 0000000000082a20 RDI: 00000000000001ff RBP: 0000000000000009 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff87255b78 R11: 0000000000000000 R12: 0000000000000009 R13: 0000000000082a20 R14: 00000000ffffffff R15: 0000000000000000 __do_kmalloc_node mm/slab.c:3636 [inline] __kmalloc_node_track_caller+0x1e/0x60 mm/slab.c:3654 kmalloc_reserve net/core/skbuff.c:354 [inline] pskb_expand_head+0x15e/0x1060 net/core/skbuff.c:1701 skb_ensure_writable net/core/skbuff.c:5695 [inline] skb_ensure_writable+0x2c7/0x450 net/core/skbuff.c:5687 __bpf_try_make_writable net/core/filter.c:1655 [inline] bpf_try_make_writable net/core/filter.c:1661 [inline] bpf_try_make_head_writable net/core/filter.c:1669 [inline] ____bpf_clone_redirect net/core/filter.c:2423 [inline] bpf_clone_redirect+0x125/0x420 net/core/filter.c:2401 ___bpf_prog_run+0x3592/0x77d0 kernel/bpf/core.c:1558 __bpf_prog_run512+0x91/0xd0 kernel/bpf/core.c:1786 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+0x37c/0x970 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: 0033:0x7f5da1bfbe99 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:00007f5da0571168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f5da1d0ef60 RCX: 00007f5da1bfbe99 RDX: 0000000000000048 RSI: 0000000020000040 RDI: 000000000000000a RBP: 00007f5da1c55ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe78ffdf8f R14: 00007f5da0571300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 89 eb mov %ebp,%ebx 2: 81 e3 11 00 40 00 and $0x400011,%ebx 8: 75 41 jne 0x4b a: 89 db mov %ebx,%ebx c: 48 83 fb 03 cmp $0x3,%rbx 10: 77 68 ja 0x7a 12: 41 83 fc 16 cmp $0x16,%r12d 16: 44 89 e5 mov %r12d,%ebp 19: 77 4e ja 0x69 1b: 48 6b db 17 imul $0x17,%rbx,%rbx 1f: 48 01 eb add %rbp,%rbx 22: 48 8b 04 dd 40 c0 55 mov -0x74aa3fc0(,%rbx,8),%rax 29: 8b * 2a: 5b pop %rbx <-- trapping instruction 2b: 5d pop %rbp 2c: 41 5c pop %r12 2e: c3 retq 2f: 48 81 ff 00 00 40 00 cmp $0x400000,%rdi 36: 77 2b ja 0x63 38: 83 ef 01 sub $0x1,%edi 3b: 41 rex.B 3c: bc .byte 0xbc 3d: ff (bad) 3e: ff (bad) 3f: ff .byte 0xff