Oops: general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] CPU: 0 UID: 0 PID: 13894 Comm: syz.2.1954 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:skb_segment+0x2ace/0x3f90 net/core/skbuff.c:4847 Code: 00 00 00 8b 6c 24 58 81 7c 24 14 ff ff 00 00 0f 85 12 e1 ff ff e8 32 63 8e f8 48 8b 44 24 20 48 8d 58 70 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 14 09 00 00 8b 1b e9 17 e1 ff ff e8 09 RSP: 0018:ffffc9001b6b6470 EFLAGS: 00010202 RAX: 000000000000000e RBX: 0000000000000070 RCX: 0000000000080000 RDX: ffffc9000debb000 RSI: 0000000000008c32 RDI: 0000000000008c33 RBP: 0000000000000004 R08: ffff888034890000 R09: 0000000000000002 R10: 000000000000a888 R11: 0000000000000002 R12: ffff88802ef128e0 R13: 00000000fffffff8 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125e1b000(0063) knlGS:00000000f54a5b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000000c39015d CR3: 000000003b01e000 CR4: 00000000003526f0 Call Trace: tcp_gso_segment+0x423/0x1a40 net/ipv4/tcp_offload.c:180 ipv6_gso_segment+0xb78/0x21a0 net/ipv6/ip6_offload.c:154 skb_mac_gso_segment+0x31f/0x640 net/core/gso.c:53 __skb_gso_segment+0x376/0x540 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0xa13/0x1440 net/core/dev.c:4018 validate_xmit_skb_list+0x84/0x120 net/core/dev.c:4068 sch_direct_xmit+0xd3/0x4b0 net/sched/sch_generic.c:332 qdisc_restart net/sched/sch_generic.c:412 [inline] __qdisc_run+0xa88/0x1510 net/sched/sch_generic.c:420 qdisc_run+0xc7/0x300 include/net/pkt_sched.h:120 __dev_xmit_skb net/core/dev.c:4265 [inline] __dev_queue_xmit+0x187e/0x3100 net/core/dev.c:4798 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK include/linux/netfilter.h:318 [inline] ip6_xmit+0x11b5/0x1970 net/ipv6/ip6_output.c:371 inet6_csk_xmit+0x4db/0x780 net/ipv6/inet6_connection_sock.c:120 __tcp_transmit_skb+0x2092/0x3aa0 net/ipv4/tcp_output.c:1631 tcp_transmit_skb net/ipv4/tcp_output.c:1649 [inline] tcp_write_xmit+0x16e8/0x6980 net/ipv4/tcp_output.c:3002 __tcp_push_pending_frames+0x97/0x380 net/ipv4/tcp_output.c:3185 tcp_push_pending_frames include/net/tcp.h:2224 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5896 [inline] tcp_rcv_established+0xfe6/0x2580 net/ipv4/tcp_input.c:6476 tcp_v6_do_rcv+0x8eb/0x1ba0 net/ipv6/tcp_ipv6.c:1607 sk_backlog_rcv include/net/sock.h:1177 [inline] __release_sock+0x1b8/0x3a0 net/core/sock.c:3213 __sk_flush_backlog+0x36/0xc0 net/core/sock.c:3236 sk_flush_backlog include/net/sock.h:1240 [inline] tcp_sendmsg_locked+0x412f/0x5520 net/ipv4/tcp.c:1213 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1412 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xe5/0x270 net/socket.c:742 __sys_sendto+0x3bd/0x520 net/socket.c:2206 __do_sys_sendto net/socket.c:2213 [inline] __se_sys_sendto net/socket.c:2209 [inline] __ia32_sys_sendto+0xdd/0x100 net/socket.c:2209 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x1dc/0x570 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fd7539 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:00000000f54a555c EFLAGS: 00000206 ORIG_RAX: 0000000000000171 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000800000c0 RDX: 00000000ffffff1d RSI: 0000000000000850 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:skb_segment+0x2ace/0x3f90 net/core/skbuff.c:4847 Code: 00 00 00 8b 6c 24 58 81 7c 24 14 ff ff 00 00 0f 85 12 e1 ff ff e8 32 63 8e f8 48 8b 44 24 20 48 8d 58 70 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 14 09 00 00 8b 1b e9 17 e1 ff ff e8 09 RSP: 0018:ffffc9001b6b6470 EFLAGS: 00010202 RAX: 000000000000000e RBX: 0000000000000070 RCX: 0000000000080000 RDX: ffffc9000debb000 RSI: 0000000000008c32 RDI: 0000000000008c33 RBP: 0000000000000004 R08: ffff888034890000 R09: 0000000000000002 R10: 000000000000a888 R11: 0000000000000002 R12: ffff88802ef128e0 R13: 00000000fffffff8 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125e1b000(0063) knlGS:00000000f54a5b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000000c39015d CR3: 000000003b01e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 00 00 add %al,(%rax) 2: 8b 6c 24 58 mov 0x58(%rsp),%ebp 6: 81 7c 24 14 ff ff 00 cmpl $0xffff,0x14(%rsp) d: 00 e: 0f 85 12 e1 ff ff jne 0xffffe126 14: e8 32 63 8e f8 call 0xf88e634b 19: 48 8b 44 24 20 mov 0x20(%rsp),%rax 1e: 48 8d 58 70 lea 0x70(%rax),%rbx 22: 48 89 d8 mov %rbx,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 14 09 00 00 jne 0x94a 36: 8b 1b mov (%rbx),%ebx 38: e9 17 e1 ff ff jmp 0xffffe154 3d: e8 .byte 0xe8 3e: 09 .byte 0x9