Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 11507 Comm: syz.1.1504 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:ife_tlv_meta_encode+0x46/0xb0 net/ife/ife.c:166 Code: 70 86 73 f6 45 8d 77 07 4d 8d 65 04 c1 e5 10 44 89 fb 83 c3 04 09 eb 0f cb 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 43 41 89 5d 00 41 81 e6 fc ff 00 00 41 8d 46 RSP: 0018:ffffc9000b176f40 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000008000100 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000010000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff8979f0c0 R12: 0000000000000004 R13: 0000000000000000 R14: 000000000000000b R15: 0000000000000004 FS: 0000000000000000(0000) GS:ffff888125a29000(0063) knlGS:00000000f5446b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007f384464fe9c CR3: 00000000338fa000 CR4: 00000000003526f0 Call Trace: ife_encode_meta_u32+0x126/0x1c0 net/sched/act_ife.c:101 tcf_ife_encode net/sched/act_ife.c:841 [inline] tcf_ife_act+0x10fd/0x1d80 net/sched/act_ife.c:877 tc_act include/net/tc_wrapper.h:130 [inline] tcf_action_exec+0x185/0x8e0 net/sched/act_api.c:1152 tc_classify include/net/tc_wrapper.h:197 [inline] __tcf_classify net/sched/cls_api.c:1764 [inline] tcf_classify+0x4cf/0x1130 net/sched/cls_api.c:1860 multiq_classify net/sched/sch_multiq.c:39 [inline] multiq_enqueue+0x102/0x4d0 net/sched/sch_multiq.c:66 dev_qdisc_enqueue+0x4e/0x240 net/core/dev.c:4147 __dev_xmit_skb net/core/dev.c:4262 [inline] __dev_queue_xmit+0x1933/0x32b0 net/core/dev.c:4798 packet_snd net/packet/af_packet.c:3076 [inline] packet_sendmsg+0x3eb6/0x50f0 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x4d7/0x810 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg+0x183/0x260 net/socket.c:2678 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x1d2/0x540 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf741d539 Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f544650c EFLAGS: 00000206 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00000000800000c0 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ife_tlv_meta_encode+0x46/0xb0 net/ife/ife.c:166 Code: 70 86 73 f6 45 8d 77 07 4d 8d 65 04 c1 e5 10 44 89 fb 83 c3 04 09 eb 0f cb 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 43 41 89 5d 00 41 81 e6 fc ff 00 00 41 8d 46 RSP: 0018:ffffc9000b176f40 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000008000100 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000010000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff8979f0c0 R12: 0000000000000004 R13: 0000000000000000 R14: 000000000000000b R15: 0000000000000004 FS: 0000000000000000(0000) GS:ffff888125a29000(0063) knlGS:00000000f5446b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007f384464fe9c CR3: 00000000338fa000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 70 86 jo 0xffffff88 2: 73 f6 jae 0xfffffffa 4: 45 8d 77 07 lea 0x7(%r15),%r14d 8: 4d 8d 65 04 lea 0x4(%r13),%r12 c: c1 e5 10 shl $0x10,%ebp f: 44 89 fb mov %r15d,%ebx 12: 83 c3 04 add $0x4,%ebx 15: 09 eb or %ebp,%ebx 17: 0f cb bswap %ebx 19: 4c 89 e8 mov %r13,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 75 43 jne 0x75 32: 41 89 5d 00 mov %ebx,0x0(%r13) 36: 41 81 e6 fc ff 00 00 and $0xfffc,%r14d 3d: 41 rex.B 3e: 8d .byte 0x8d 3f: 46 rex.RX