------------[ cut here ]------------
WARNING: CPU: 1 PID: 8495 at net/mptcp/protocol.c:695 __mptcp_move_skbs_from_subflow+0x20a9/0x21f0 net/mptcp/protocol.c:695
Modules linked in:
CPU: 1 UID: 0 PID: 8495 Comm: syz.0.648 Not tainted 6.11.0-syzkaller-07341-gbaeb9a7d8b60 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__mptcp_move_skbs_from_subflow+0x20a9/0x21f0 net/mptcp/protocol.c:695
Code: 0f b6 dc 31 ff 89 de e8 95 c6 ed f5 89 d8 48 81 c4 50 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 78 c3 ed f5 90 <0f> 0b 90 e9 47 ff ff ff e8 6a c3 ed f5 90 0f 0b 90 e9 99 e0 ff ff
RSP: 0018:ffffc90000a17db8 EFLAGS: 00010246
RAX: ffffffff8ba6fba8 RBX: 00000000000081cd RCX: ffff88801c78da00
RDX: 0000000000000100 RSI: 000000000000e051 RDI: 00000000000081cd
RBP: 1ffff1100d458a9e R08: ffffffff8ba6eba2 R09: 1ffff1100d458aa8
R10: dffffc0000000000 R11: ffffed100d458aa9 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000035c2f6fd R15: 000000000000e051
FS:  00007fa4ab9de6c0(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020013000 CR3: 00000000713e4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 move_skbs_to_msk net/mptcp/protocol.c:811 [inline]
 mptcp_data_ready+0x29c/0xa90 net/mptcp/protocol.c:854
 subflow_data_ready+0x34a/0x920 net/mptcp/subflow.c:1490
 tcp_data_queue+0x20fd/0x76c0 net/ipv4/tcp_input.c:5283
 tcp_rcv_established+0xfba/0x2020 net/ipv4/tcp_input.c:6237
 tcp_v4_do_rcv+0x96d/0xc70 net/ipv4/tcp_ipv4.c:1915
 tcp_v4_rcv+0x2dc0/0x37f0 net/ipv4/tcp_ipv4.c:2350
 ip_protocol_deliver_rcu+0x22e/0x440 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x341/0x5f0 net/ipv4/ip_input.c:233
 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:5662 [inline]
 __netif_receive_skb+0x2bf/0x650 net/core/dev.c:5775
 process_backlog+0x662/0x15b0 net/core/dev.c:6107
 __napi_poll+0xcb/0x490 net/core/dev.c:6771
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6962
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 do_softirq+0x11b/0x1e0 kernel/softirq.c:455
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 unlock_sock_fast include/net/sock.h:1670 [inline]
 mptcp_rcv_space_adjust net/mptcp/protocol.c:2068 [inline]
 mptcp_recvmsg+0x2453/0x2dd0 net/mptcp/protocol.c:2271
 inet_recvmsg+0x2b5/0x2d0 net/ipv4/af_inet.c:885
 sock_recvmsg_nosec net/socket.c:1052 [inline]
 sock_recvmsg+0x1ae/0x280 net/socket.c:1074
 __sys_recvfrom+0x24a/0x3d0 net/socket.c:2261
 __do_sys_recvfrom net/socket.c:2279 [inline]
 __se_sys_recvfrom net/socket.c:2275 [inline]
 __x64_sys_recvfrom+0xde/0x100 net/socket.c:2275
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa4abf7def9
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:00007fa4ab9de038 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 00007fa4ac136208 RCX: 00007fa4abf7def9
RDX: 0000000000013e58 RSI: 0000000020000180 RDI: 0000000000000008
RBP: 00007fa4abff0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000040000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa4ac136208 R15: 00007fa4ac25fa28
 </TASK>