Segmentation fault in rtt_ros_integration_example

asked 2011-03-24 23:21:15 -0500

1071 ●18 ●27 ●32

updated 2011-03-27 05:11:37 -0500

Hi,

I'm trying to run the hello world example in rtt_ros_integration_example and I get a segmentation fault after (or while, not sure) importing the ROS types. Last lines before the segfault are:

0.084 [ Info   ][TypekitRepository::Import] Loading Typekit ros-primitives.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'time' to the Orocos Type System.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'int8' to the Orocos Type System.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'int8[]' to the Orocos Type System.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'uint8' to the Orocos Type System.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'uint8[]' to the Orocos Type System.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'int16' to the Orocos Type System.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'int16[]' to the Orocos Type System.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'uint16' to the Orocos Type System.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'uint16[]' to the Orocos Type System.
0.084 [ Debug  ][TypekitRepository::Import] Registered Type name 'int32' to the Orocos Type System.
0.085 [ Warning][TypekitRepository::Import] Overriding TypeInfo for 'ints' with 'int32[]'.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'int32[]' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'uint32' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'uint32[]' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'int64' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'int64[]' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'uint64' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'uint64[]' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'float32' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'float32[]' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'float64' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'float64[]' to the Orocos Type System.
0.085 [ Debug  ][TypekitRepository::Import] Registered Type name 'string' to the Orocos Type System.
Segmentation fault

I'm running ROS diamondback using pre-compiled debian packages. Has anyone managed to run this example? Any idea of what might be going wrong?

Edit: I provide a gdb backtrace, as Ruben suggested.

6.331 [ Debug  ][TypekitRepository::Import] Registered Type name 'string' to the Orocos Type System.

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff0a69dd7 in ros_integration::ROSPrimitivesTypekitPlugin::loadConstructors (this=<value optimised out>)
    at /tmp/buildd/ros-diamondback-orocos-toolchain-ros-0.2.1/debian/ros-diamondback-orocos-toolchain-ros/opt/ros/diamondback/stacks/orocos_toolchain_ros/rtt_ros_integration/src/orocos/types/ros_primitives_typekit_plugin.cpp:122
122 /tmp/buildd/ros-diamondback-orocos-toolchain-ros-0.2.1/debian/ros-diamondback-orocos-toolchain-ros/opt/ros/diamondback/stacks/orocos_toolchain_ros/rtt_ros_integration/src/orocos/types/ros_primitives_typekit_plugin.cpp: No such file or directory.
    in /tmp/buildd/ros-diamondback-orocos-toolchain-ros-0.2.1/debian/ros-diamondback-orocos-toolchain-ros/opt/ros/diamondback/stacks/orocos_toolchain_ros/rtt_ros_integration/src/orocos/types/ros_primitives_typekit_plugin.cpp
(gdb) backtrace
#0  0x00007ffff0a69dd7 in ros_integration::ROSPrimitivesTypekitPlugin::loadConstructors (this=<value optimised out>)
    at ...

(more)

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answered 2011-03-28 08:34:35 -0500

Ruben Smits
543 ●4 ●10 ●16 http://www.intermodalics.eu/

updated 2011-03-28 08:39:00 -0500

Ok, it's really strange that no-one, including me, never bumped into this one. It looks like the 'float' type is not known to the RTT typesystem before importing the ros_primitives typekit. This can happen if the rtt_primitives typekit is not loaded yet.

Could you retry after exporting

 RTT_COMPONENT_PATH=`rospack find rtt`/install/lib/orocos

this should make sure the rtt_primitives are loaded at startup. Can you verify this in the log?

If it still does not work, could you post the entire log so I can see why the rtt_primitives are not loaded?

-- Ruben

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Comments

It does work now. I can see that the 'float' type gets loaded from librtt-typekit-gnulinux.so (I guess this is the typekit you're referring to) before being overriden by float32 in librtt-ros-primitives-typekit-gnulinux.so. If you need me to run any other test to see why it happens, please ask.