Oops: general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] CPU: 1 UID: 0 PID: 15605 Comm: syz.3.7617 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:skb_segment+0x2ace/0x3f90 net/core/skbuff.c:4806 Code: 00 00 00 8b 6c 24 58 81 7c 24 14 ff ff 00 00 0f 85 12 e1 ff ff e8 52 d1 9d 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 29 RSP: 0018:ffffc9000f94e2d0 EFLAGS: 00010202 RAX: 000000000000000e RBX: 0000000000000070 RCX: 0000000000080000 RDX: ffffc90005004000 RSI: 0000000000018601 RDI: 0000000000018602 RBP: 0000000000000004 R08: ffff88802d853c80 R09: 0000000000000002 R10: 000000000000a888 R11: 0000000000000002 R12: ffff888020312de0 R13: 00000000fffffff8 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f863ed3e6c0(0000) GS:ffff888126478000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000200000 CR3: 0000000056444000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000508c DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: tcp_gso_segment+0x423/0x1a40 net/ipv4/tcp_offload.c:180 ipv6_gso_segment+0xb75/0x21a0 net/ipv6/ip6_offload.c:154 skb_mac_gso_segment+0x31c/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+0x8de/0x1270 net/core/dev.c:3997 validate_xmit_skb_list+0x84/0x120 net/core/dev.c:4047 sch_direct_xmit+0xd3/0x4b0 net/sched/sch_generic.c:329 qdisc_restart net/sched/sch_generic.c:409 [inline] __qdisc_run+0xb16/0x15f0 net/sched/sch_generic.c:417 __dev_xmit_skb net/core/dev.c:4221 [inline] __dev_queue_xmit+0x1056/0x3b50 net/core/dev.c:4729 dev_queue_xmit include/linux/netdevice.h:3365 [inline] neigh_hh_output include/net/neighbour.h:531 [inline] neigh_output include/net/neighbour.h:545 [inline] ip6_finish_output2+0xf70/0x1480 net/ipv6/ip6_output.c:136 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:1628 tcp_transmit_skb net/ipv4/tcp_output.c:1646 [inline] tcp_write_xmit+0x19c1/0x69a0 net/ipv4/tcp_output.c:2988 __tcp_push_pending_frames+0x97/0x360 net/ipv4/tcp_output.c:3171 tcp_push_pending_frames include/net/tcp.h:2221 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5873 [inline] tcp_rcv_established+0x13c8/0x2670 net/ipv4/tcp_input.c:6443 tcp_v6_do_rcv+0xa9d/0x13f0 net/ipv6/tcp_ipv6.c:1652 sk_backlog_rcv include/net/sock.h:1158 [inline] __release_sock+0x1b8/0x3a0 net/core/sock.c:3180 __sk_flush_backlog+0x36/0xc0 net/core/sock.c:3203 sk_flush_backlog include/net/sock.h:1221 [inline] tcp_sendmsg_locked+0x4303/0x5540 net/ipv4/tcp.c:1214 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1413 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xe5/0x270 net/socket.c:742 __sys_sendto+0x3bd/0x520 net/socket.c:2244 __do_sys_sendto net/socket.c:2251 [inline] __se_sys_sendto net/socket.c:2247 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2247 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f863df8eec9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f863ed3e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f863e1e5fa0 RCX: 00007f863df8eec9 RDX: ffffffffffffff1d RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f863e011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000850 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f863e1e6038 R14: 00007f863e1e5fa0 R15: 00007f863e30fa28 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_segment+0x2ace/0x3f90 net/core/skbuff.c:4806 Code: 00 00 00 8b 6c 24 58 81 7c 24 14 ff ff 00 00 0f 85 12 e1 ff ff e8 52 d1 9d 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 29 RSP: 0018:ffffc9000f94e2d0 EFLAGS: 00010202 RAX: 000000000000000e RBX: 0000000000000070 RCX: 0000000000080000 RDX: ffffc90005004000 RSI: 0000000000018601 RDI: 0000000000018602 RBP: 0000000000000004 R08: ffff88802d853c80 R09: 0000000000000002 R10: 000000000000a888 R11: 0000000000000002 R12: ffff888020312de0 R13: 00000000fffffff8 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f863ed3e6c0(0000) GS:ffff888126478000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000200000 CR3: 0000000056444000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000508c DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- 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 52 d1 9d f8 call 0xf89dd16b 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: 29 .byte 0x29