------------[ cut here ]------------
WARNING: CPU: 0 PID: 17256 at net/mptcp/subflow.c:1520 subflow_data_ready+0x4b8/0x7e0
Modules linked in:
CPU: 0 UID: 0 PID: 17256 Comm: syz.1.2939 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:subflow_data_ready+0x4b8/0x7e0
Code: 0f 0b 90 90 e9 bc fc ff ff e8 24 95 58 f6 48 89 df 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 6e 0e 00 00 e8 09 95 58 f6 90 <0f> 0b 90 e9 e5 fd ff ff 90 0f 0b 90 43 0f b6 04 2f 84 c0 0f 85 a1
RSP: 0018:ffffc90000007160 EFLAGS: 00010246
RAX: ffffffff8b671887 RBX: ffff888023d0ce00 RCX: ffff88802068b980
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888030e2ad37 R09: 1ffff110061c55a6
R10: dffffc0000000000 R11: ffffed10061c55a7 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888030e2a400 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f50d6266fc8 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 tcp_data_queue+0x54b/0x6450
 tcp_rcv_state_process+0x23a4/0x44d0
 tcp_v4_do_rcv+0x3f2/0xce0
 tcp_v4_rcv+0x252a/0x2dc0
 ip_protocol_deliver_rcu+0x221/0x440
 ip_local_deliver_finish+0x3bb/0x6f0
 NF_HOOK+0x30c/0x3a0
 NF_HOOK+0x30c/0x3a0
 __netif_receive_skb+0x143/0x380
 process_backlog+0x60e/0x14f0
 __napi_poll+0xc7/0x360
 net_rx_action+0x707/0xe30
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_switch+0x101/0x130
Code: f3 48 c1 e3 05 4c 8d 63 28 4d 39 fc 77 9d 49 ff c6 4d 89 33 49 89 4c 1b 08 4d 89 54 1b 10 49 89 7c 1b 18 49 89 54 1b 20 eb 81 <5b> 41 5c 41 5e 41 5f e9 03 38 be 09 cc b9 05 00 00 00 48 85 c0 0f
RSP: 0018:ffffc90007b9f2a8 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffea0004904580 RCX: 0000000000000005
RDX: ffffffff8211d7d4 RSI: ffffffff8e239bc0 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff88802068b980 R09: 0000000000000003
R10: 0000000000000002 R11: 0000000000000000 R12: ffffea0004904580
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffea0004904580
 __folio_rmap_sanity_checks+0x1d4/0x7d0
 folio_remove_rmap_ptes+0x3b/0xaf0
 unmap_page_range+0x1f7f/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff637d8ec29
Code: Unable to access opcode bytes at 0x7ff637d8ebff.
RSP: 002b:00007ff638ba5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: fffffffffffffff4 RBX: 00007ff637fd6090 RCX: 00007ff637d8ec29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006a040000
RBP: 00007ff637e11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff637fd6128 R14: 00007ff637fd6090 R15: 00007ffd9d48c0d8
 </TASK>
