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: 18833 Comm: syz.3.3909 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:skb_segment+0x2b3f/0x4030 net/core/skbuff.c:4880 Code: 44 8b bc 24 a0 00 00 00 81 7c 24 1c ff ff 00 00 0f 85 dd e0 ff ff e8 c0 15 45 f8 48 8b 04 24 48 8d 58 70 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 1a 09 00 00 44 8b 33 48 8b 9c 24 b0 00 RSP: 0018:ffffc900049ae4a8 EFLAGS: 00010202 RAX: 000000000000000e RBX: 0000000000000070 RCX: 0000000000080000 RDX: ffffc900141d8000 RSI: 000000000001c43c RDI: 000000000001c43d RBP: 000000000000004a R08: ffff888058c50000 R09: 0000000000000002 R10: 000000000000a888 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88807b56c830 R15: 0000000000000003 FS: 00007fd2a59f86c0(0000) GS:ffff888125116000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000002a8000 CR3: 0000000035fc2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000009a DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: tcp_gso_segment+0x424/0x1a40 net/ipv4/tcp_offload.c:181 ipv6_gso_segment+0xb38/0x1840 net/ipv6/ip6_offload.c:135 skb_mac_gso_segment+0x31c/0x690 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+0xa21/0x14a0 net/core/dev.c:4016 __dev_queue_xmit+0x1250/0x38a0 net/core/dev.c:4822 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246 NF_HOOK include/linux/netfilter.h:318 [inline] ip6_xmit+0x1149/0x1980 net/ipv6/ip6_output.c:358 inet6_csk_xmit+0x4a5/0x750 net/ipv6/inet6_connection_sock.c:114 __tcp_transmit_skb+0x249b/0x43e0 net/ipv4/tcp_output.c:1693 tcp_transmit_skb net/ipv4/tcp_output.c:1711 [inline] tcp_write_xmit+0x16e8/0x6980 net/ipv4/tcp_output.c:3064 __tcp_push_pending_frames+0x97/0x380 net/ipv4/tcp_output.c:3247 tcp_push_pending_frames include/net/tcp.h:2282 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:6130 [inline] tcp_rcv_established+0xfd8/0x2740 net/ipv4/tcp_input.c:6712 tcp_v6_do_rcv+0x8eb/0x1ba0 net/ipv6/tcp_ipv6.c:1609 sk_backlog_rcv include/net/sock.h:1185 [inline] __release_sock+0x1b8/0x3a0 net/core/sock.c:3213 release_sock+0x5f/0x1f0 net/core/sock.c:3795 sk_stream_wait_memory+0x72b/0xf80 net/core/stream.c:149 tcp_sendmsg_locked+0x23ba/0x5490 net/ipv4/tcp.c:1417 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1464 sock_sendmsg_nosec+0x8e/0x1d0 net/socket.c:737 __sock_sendmsg net/socket.c:752 [inline] __sys_sendto+0x3ff/0x590 net/socket.c:2221 __do_sys_sendto net/socket.c:2228 [inline] __se_sys_sendto net/socket.c:2224 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2224 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd2a4b9bf79 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd2a59f8028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fd2a4e15fa0 RCX: 00007fd2a4b9bf79 RDX: 00000000ffffff5d RSI: 0000200000000900 RDI: 0000000000000004 RBP: 00007fd2a4c327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd2a4e16038 R14: 00007fd2a4e15fa0 R15: 00007ffe5ee01bb8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_segment+0x2b3f/0x4030 net/core/skbuff.c:4880 Code: 44 8b bc 24 a0 00 00 00 81 7c 24 1c ff ff 00 00 0f 85 dd e0 ff ff e8 c0 15 45 f8 48 8b 04 24 48 8d 58 70 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 1a 09 00 00 44 8b 33 48 8b 9c 24 b0 00 RSP: 0018:ffffc900049ae4a8 EFLAGS: 00010202 RAX: 000000000000000e RBX: 0000000000000070 RCX: 0000000000080000 RDX: ffffc900141d8000 RSI: 000000000001c43c RDI: 000000000001c43d RBP: 000000000000004a R08: ffff888058c50000 R09: 0000000000000002 R10: 000000000000a888 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88807b56c830 R15: 0000000000000003 FS: 00007fd2a59f86c0(0000) GS:ffff888125116000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000002a8000 CR3: 0000000035fc2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000009a DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 44 8b bc 24 a0 00 00 mov 0xa0(%rsp),%r15d 7: 00 8: 81 7c 24 1c ff ff 00 cmpl $0xffff,0x1c(%rsp) f: 00 10: 0f 85 dd e0 ff ff jne 0xffffe0f3 16: e8 c0 15 45 f8 call 0xf84515db 1b: 48 8b 04 24 mov (%rsp),%rax 1f: 48 8d 58 70 lea 0x70(%rax),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 1a 09 00 00 jne 0x951 37: 44 8b 33 mov (%rbx),%r14d 3a: 48 rex.W 3b: 8b .byte 0x8b 3c: 9c pushf 3d: 24 b0 and $0xb0,%al