FAST-RTPS Assertion error with image_tools with fastrtps and connext

[Karsten1987]

Bug report

Required Info:

• Operating System:
  • OSX Sierra, 10.12.6
• Installation type:
  • source
• Version or commit hash:
  • master
• DDS implementation:
  • rmw_connext_cpp vs rmw_fastrtps_cpp

Steps to reproduce issue

First terminal:

RMW_IMPLEMENTATION=rmw_connext_cpp ros2 run image_tools showimage

Second terminal:

RMW_IMPLEMENTATION=rmw_fastrtps_cpp ros2 run image_tools cam2image

Expected behavior

No crash. Image tools are transporting images. The excepted behavior should the same when only using fastrtps.

Actual behavior

A few images are getting transported. However, fastrtps node cam2image crashes with assertion error:

...
[INFO] [cam2image]: Publishing image #221
[INFO] [cam2image]: Publishing image #222
[INFO] [cam2image]: Publishing image #223
Assertion failed: (*sn <= change->getDataFragments()->size()), function add_change, file /Users/karsten/workspace/osrf/ros2_full/src/eProsima/Fast-RTPS/src/cpp/rtps/writer/../flowcontrol/../writer/RTPSWriterCollector.h, line 83.