Assertion failure in io_readable: Assertion 'multistream_flow' failed

[fredhau]

When running a custom NEAT client on Linux and a custom NEAT server on FreeBSD, I get the following assertion error in the NEAT client:

neat_core.c:1738: io_readable: Assertion 'multistream_flow' failed.

However, this error is not present when both of the machines run Linux.

The problem occurs because the code expects nt_sctp_get_flow_by_sid to return a multistream flow, but NULL is indeed returned.

The following properties are specified at both sides: { "transport": { "value": [SCTP], "precedence": 1 } }. The client sends a HTTP request to the server after connecting, but the problem seems to be related to the reception of the HTTP response from the server.

The Linux system runs Ubuntu 16.04.1 LTS 4.13.0-32-generic. The FreeBSD system runs FreeBSD 11.1-RELEASE r321309.

[weinrank]

You're using the latest master branch?

[fredhau]

Yes.

[fredhau]

Note that this issue still occurs even when SCTP works properly as described in #432. I also tested this on real hardware.

[weinrank]

I will check the issue and report back, thanks for the hint.