RAX: ffffffffffffffda RBX: 00007f6e685abf80 RCX: 00007f6e6847c9ef RDX: 0000000000000056 RSI: 0000000020000040 RDI: 00000000000000c8 RBP: 00007f6e69101120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000056 R11: 0000000000000293 R12: 0000000000000001 R13: 000000000000000b R14: 00007f6e685abf80 R15: 00007ffe76c13868 general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 PID: 9533 Comm: syz-executor.0 Not tainted 6.9.0-rc6-syzkaller-01478-gcdc74c9d06e7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:subflow_v6_route_req+0x2c7/0x490 net/mptcp/subflow.c:388 Code: 8d 7b 07 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 c0 01 00 00 0f b6 43 07 48 8d 1c c3 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 84 01 00 00 0f b6 5b 01 83 e3 0f 48 89 RSP: 0018:ffffc90014d16b68 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88807e72bc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88802cac08c0 R08: ffffffff8b6cb76b R09: 1ffff11005958120 R10: dffffc0000000000 R11: ffffed1005958121 R12: dffffc0000000000 R13: ffff88802213a273 R14: ffff888077dc3500 R15: ffff88801f11e800 FS: 00007f6e691016c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6e69100ff8 CR3: 0000000064760000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tcp_conn_request+0xf07/0x32c0 net/ipv4/tcp_input.c:7180 tcp_rcv_state_process+0x183c/0x4500 net/ipv4/tcp_input.c:6663 tcp_v6_do_rcv+0x8b2/0x1310 net/ipv6/tcp_ipv6.c:1673 tcp_v6_rcv+0x22b4/0x30b0 net/ipv6/tcp_ipv6.c:1910 ip6_protocol_deliver_rcu+0xc76/0x1570 net/ipv6/ip6_input.c:438 ip6_input_finish+0x186/0x2d0 net/ipv6/ip6_input.c:483 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314 __netif_receive_skb_one_core net/core/dev.c:5625 [inline] __netif_receive_skb+0x1ea/0x650 net/core/dev.c:5739 netif_receive_skb_internal net/core/dev.c:5825 [inline] netif_receive_skb+0x1e8/0x890 net/core/dev.c:5885 tun_rx_batched+0x1b7/0x8f0 drivers/net/tun.c:1549 tun_get_user+0x2f35/0x4560 drivers/net/tun.c:2002 tun_chr_write_iter+0x113/0x1f0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2110 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa84/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6e6847c9ef Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 0c 81 02 00 48 RSP: 002b:00007f6e69101090 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6e685abf80 RCX: 00007f6e6847c9ef RDX: 0000000000000056 RSI: 0000000020000040 RDI: 00000000000000c8 RBP: 00007f6e69101120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000056 R11: 0000000000000293 R12: 0000000000000001 R13: 000000000000000b R14: 00007f6e685abf80 R15: 00007ffe76c13868 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:subflow_v6_route_req+0x2c7/0x490 net/mptcp/subflow.c:388 Code: 8d 7b 07 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 c0 01 00 00 0f b6 43 07 48 8d 1c c3 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 84 01 00 00 0f b6 5b 01 83 e3 0f 48 89 RSP: 0018:ffffc90014d16b68 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88807e72bc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88802cac08c0 R08: ffffffff8b6cb76b R09: 1ffff11005958120 R10: dffffc0000000000 R11: ffffed1005958121 R12: dffffc0000000000 R13: ffff88802213a273 R14: ffff888077dc3500 R15: ffff88801f11e800 FS: 00007f6e691016c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6e69100ff8 CR3: 0000000064760000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8d 7b 07 lea 0x7(%rbx),%edi 3: 48 89 f8 mov %rdi,%rax 6: 48 c1 e8 03 shr $0x3,%rax a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax f: 84 c0 test %al,%al 11: 0f 85 c0 01 00 00 jne 0x1d7 17: 0f b6 43 07 movzbl 0x7(%rbx),%eax 1b: 48 8d 1c c3 lea (%rbx,%rax,8),%rbx 1f: 48 83 c3 18 add $0x18,%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 84 01 00 00 jne 0x1bb 37: 0f b6 5b 01 movzbl 0x1(%rbx),%ebx 3b: 83 e3 0f and $0xf,%ebx 3e: 48 rex.W 3f: 89 .byte 0x89