netdev - mptcp splat

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Date: Wed, 27 Mar 2024 09:43:09 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Network Development <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>, 
	MPTCP Upstream <mptcp@...ts.linux.dev>, Matthieu Baerts <matttbe@...nel.org>, 
	Mat Martineau <martineau@...nel.org>, Jakub Kicinski <kuba@...nel.org>, 
	Martin KaFai Lau <martin.lau@...nel.org>
Subject: mptcp splat

Hi,

I ffwded bpf tree with the recent net fixes and caught this:

[   48.386337] WARNING: CPU: 32 PID: 3276 at net/mptcp/subflow.c:1430
subflow_data_ready+0x147/0x1c0
[   48.392012] Modules linked in: dummy bpf_testmod(O) [last unloaded:
bpf_test_no_cfi(O)]
[   48.396609] CPU: 32 PID: 3276 Comm: test_progs Tainted: G
O       6.8.0-12873-g2c43c33bfd23 #1014
#[   48.467143] Call Trace:
[   48.469094]  <TASK>
[   48.472159]  ? __warn+0x80/0x180
[   48.475019]  ? subflow_data_ready+0x147/0x1c0
[   48.478068]  ? report_bug+0x189/0x1c0
[   48.480725]  ? handle_bug+0x36/0x70
[   48.483061]  ? exc_invalid_op+0x13/0x60
[   48.485809]  ? asm_exc_invalid_op+0x16/0x20
[   48.488754]  ? subflow_data_ready+0x147/0x1c0
[   48.492159]  mptcp_set_rcvlowat+0x79/0x1d0
[   48.495026]  sk_setsockopt+0x6c0/0x1540

It doesn't reproduce all the time though.
Some race?
Known issue?