------------[ cut here ]------------
WARNING: CPU: 1 PID: 13899 at net/mptcp/pm_netlink.c:1548 __mark_subflow_endp_available include/linux/refcount.h:-1 [inline]
WARNING: CPU: 1 PID: 13899 at net/mptcp/pm_netlink.c:1548 mptcp_pm_nl_fullmesh net/mptcp/pm_netlink.c:2018 [inline]
WARNING: CPU: 1 PID: 13899 at net/mptcp/pm_netlink.c:1548 mptcp_nl_set_flags net/mptcp/pm_netlink.c:2041 [inline]
WARNING: CPU: 1 PID: 13899 at net/mptcp/pm_netlink.c:1548 mptcp_nl_cmd_set_flags+0xe58/0x11f0 net/mptcp/pm_netlink.c:2107
Modules linked in:
CPU: 1 PID: 13899 Comm: syz.6.2549 Not tainted 6.1.133-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__mark_subflow_endp_available net/mptcp/pm_netlink.c:1548 [inline]
RIP: 0010:mptcp_pm_nl_fullmesh net/mptcp/pm_netlink.c:2018 [inline]
RIP: 0010:mptcp_nl_set_flags net/mptcp/pm_netlink.c:2041 [inline]
RIP: 0010:mptcp_nl_cmd_set_flags+0xe58/0x11f0 net/mptcp/pm_netlink.c:2107
Code: 0e 01 00 00 49 89 c5 e8 76 31 e7 f6 e9 c0 fc ff ff e8 6c 31 e7 f6 4c 89 f7 be 03 00 00 00 e8 2f 72 a0 f9 eb a0 e8 58 31 e7 f6 <0f> 0b e9 10 ff ff ff 89 d9 80 e1 07 38 c1 0f 8c d3 fc ff ff 48 89
RSP: 0018:ffffc9000e2af260 EFLAGS: 00010283
RAX: ffffffff8aa378f8 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000c719000 RSI: 0000000000001ce4 RDI: 0000000000001ce5
RBP: ffffc9000e2af510 R08: ffffffff8aa377f0 R09: ffffed100e7bb5a0
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888073dda280 R14: ffff888073ddacf0 R15: 1ffff1100e7bb59e
FS: 00007f3cab4b36c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33a1dff8 CR3: 0000000077ef5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
genl_family_rcv_msg_doit net/netlink/genetlink.c:756 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:833 [inline]
genl_rcv_msg+0xbfa/0xf50 net/netlink/genetlink.c:850
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x7e2/0x970 net/netlink/af_netlink.c:1337
netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
___sys_sendmsg net/socket.c:2573 [inline]
__sys_sendmsg+0x2a9/0x390 net/socket.c:2602
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3caa58d169
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:00007f3cab4b3038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3caa7a5fa0 RCX: 00007f3caa58d169
RDX: 0000000000000000 RSI: 0000200000000480 RDI: 0000000000000006
RBP: 00007f3caa60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3caa7a5fa0 R15: 00007fff45dc3618
</TASK>