RDX: 0000000000000056 RSI: 0000000020000040 RDI: 00000000000000c8 RBP: 0000000000000001 R08: 0000000000000001 R09: 00007fff85990767 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff85990a10 R13: 0000000000000000 R14: 00007fff85990a10 R15: 00007fff85990a00 BUG: kernel NULL pointer dereference, address: 0000000000000019 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 80000001159b0067 P4D 80000001159b0067 PUD 1156f9067 PMD 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 0 PID: 13949 Comm: syz-executor154 Not tainted 6.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:subflow_v6_route_req+0x137/0x200 net/mptcp/subflow.c:389 Code: 00 00 e8 bc 55 fd fc e9 d2 00 00 00 e8 b2 55 fd fc e9 c6 00 00 00 e8 a8 55 fd fc 49 8b 86 e8 00 00 00 0f b6 48 07 48 8d 04 c8 <0f> b6 58 19 83 e3 0f 48 89 df 48 c7 c6 90 e2 df 85 e8 03 5b fd fc RSP: 0018:ffffc9000258b780 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88817b843700 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888114c2c200 R08: ffffffff843ea1b7 R09: 0000000000000000 R10: 5b5d303631393932 R11: ffffffff82a5f6d0 R12: 00000000ffffffff R13: ffff888113d5b100 R14: ffff888113d5b100 R15: ffff88817b8172c0 FS: 000055555d155380(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000019 CR3: 0000000113ca2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tcp_conn_request+0x52d/0xf90 net/ipv4/tcp_input.c:7179 tcp_rcv_state_process+0x11f/0x1590 net/ipv4/tcp_input.c:6662 tcp_v6_do_rcv+0x4d6/0x860 net/ipv6/tcp_ipv6.c:1675 tcp_v6_rcv+0x10de/0x15c0 net/ipv6/tcp_ipv6.c:1912 ip6_protocol_deliver_rcu+0x3ea/0x850 net/ipv6/ip6_input.c:438 ip6_input_finish+0x85/0xc0 net/ipv6/ip6_input.c:483 NF_HOOK include/linux/netfilter.h:314 [inline] ip6_input+0x45/0x140 net/ipv6/ip6_input.c:492 NF_HOOK include/linux/netfilter.h:314 [inline] ipv6_rcv+0x60/0x160 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core net/core/dev.c:5611 [inline] __netif_receive_skb+0x84/0x210 net/core/dev.c:5725 netif_receive_skb_internal net/core/dev.c:5811 [inline] netif_receive_skb+0xb9/0x380 net/core/dev.c:5871 tun_rx_batched+0x102/0x2a0 drivers/net/tun.c:1549 tun_get_user+0x15f5/0x1bf0 drivers/net/tun.c:2002 tun_chr_write_iter+0xa4/0x120 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+0x652/0x7b0 fs/read_write.c:590 ksys_write+0xc6/0x180 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8f/0x1a0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f580c005c90 Code: 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 80 3d 11 e4 07 00 00 74 17 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 48 83 ec 28 48 89 RSP: 002b:00007fff859909c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fff859909f0 RCX: 00007f580c005c90 RDX: 0000000000000056 RSI: 0000000020000040 RDI: 00000000000000c8 RBP: 0000000000000001 R08: 0000000000000001 R09: 00007fff85990767 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff85990a10 R13: 0000000000000000 R14: 00007fff85990a10 R15: 00007fff85990a00 Modules linked in: CR2: 0000000000000019 ---[ end trace 0000000000000000 ]--- RIP: 0010:subflow_v6_route_req+0x137/0x200 net/mptcp/subflow.c:389 Code: 00 00 e8 bc 55 fd fc e9 d2 00 00 00 e8 b2 55 fd fc e9 c6 00 00 00 e8 a8 55 fd fc 49 8b 86 e8 00 00 00 0f b6 48 07 48 8d 04 c8 <0f> b6 58 19 83 e3 0f 48 89 df 48 c7 c6 90 e2 df 85 e8 03 5b fd fc RSP: 0018:ffffc9000258b780 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88817b843700 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888114c2c200 R08: ffffffff843ea1b7 R09: 0000000000000000 R10: 5b5d303631393932 R11: ffffffff82a5f6d0 R12: 00000000ffffffff R13: ffff888113d5b100 R14: ffff888113d5b100 R15: ffff88817b8172c0 FS: 000055555d155380(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000019 CR3: 0000000113ca2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: e8 bc 55 fd fc call 0xfcfd55c3 7: e9 d2 00 00 00 jmp 0xde c: e8 b2 55 fd fc call 0xfcfd55c3 11: e9 c6 00 00 00 jmp 0xdc 16: e8 a8 55 fd fc call 0xfcfd55c3 1b: 49 8b 86 e8 00 00 00 mov 0xe8(%r14),%rax 22: 0f b6 48 07 movzbl 0x7(%rax),%ecx 26: 48 8d 04 c8 lea (%rax,%rcx,8),%rax * 2a: 0f b6 58 19 movzbl 0x19(%rax),%ebx <-- trapping instruction 2e: 83 e3 0f and $0xf,%ebx 31: 48 89 df mov %rbx,%rdi 34: 48 c7 c6 90 e2 df 85 mov $0xffffffff85dfe290,%rsi 3b: e8 03 5b fd fc call 0xfcfd5b43