Warning "Error sending data on stream 11: (22) Invalid argument" running data channels test

[ferjm]

Running https://ferjm.github.io/samples/src/content/datachannel/basic/ on Servo shows the following warning:

** (<unknown>:47792): WARNING **: 15:21:30.553: Error sending data on stream 11: (22) Invalid argument

It seems to come from https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/blob/c1b8802c71d34e3d32bf83161329449624376713/ext/sctp/sctpassociation.c#L520

[jdm]

All of the EINVAL checks in https://github.com/sctplab/usrsctp/blob/63d620ae9ab818cf51448c9ad0a04f9688c5f28b/usrsctplib/user_socket.c#L864-L889 look like they should pass, so I think this must be coming from lower in the stack.

[jdm]

One possibility for digging into this might be building gstreamer from scratch and modifying https://gitlab.freedesktop.org/gstreamer/cerbero/-/blob/master/recipes/libusrsctp.recipe to add the sctp_debug meson option.