Re: mptcp splat

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On Wed, 2024-03-27 at 09:43 -0700, Alexei Starovoitov wrote:
> 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?

It was not known to me. Looks like something related to not so recent
changes (rcvlowat support).

Definitely looks lie a race.

If you could share more info about the running context and/or a full
decoded splat it could help, thanks!

Paolo






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