Using tensorflow.contrib with cv_bridge causes tcmalloc error

[ethanabrooks]

Environment info

Operating System:

❯ uname -a 
Linux dos 3.13.0-76-generic #120-Ubuntu SMP Mon Jan 18 15:59:10 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Minimal reproducible example.

import tensorflow.contrib
import cv_bridge

import rospy
rospy.init_node('node')

This throws the following error:

/usr/bin/python2.7 /home/ethan/.PyCharmCE2016.3/config/scratches/scratch_4.py
src/tcmalloc.cc:277] Attempt to free invalid pointer 0xa2e78616d5f7475 

Process finished with exit code 134 (interrupted by signal 6: SIGABRT)

I've also posted to the tensorflow page (tensorflow/tensorflow#8146)

What other attempted solutions have you tried?

I tried reinstalling ros and tensorflow. No change. I also tried print(cv_bridge.__file__) to make sure I was importing the right directory for cv_bridge.

[ethanabrooks]

The solution was to switch the order of imports:

import tensorflow.contrib
import cv_bridge

import rospy
rospy.init_node('node')

Nevertheless, this is clearly a bug.

[ethanabrooks]

Ok. I did a little more digging and I found this line in my .zshrc:

export LD_PRELOAD="/usr/lib/libtcmalloc_minimal.so.4"  

Commenting this out solved the problem. I'm not really sure which of the three libraries that were involved would be responsible, but it might be good to include a more informative error message.

[vrabaud]

ok, that is a tough one that really depends on your setting. What does libtcmalloc_minimal do ? Is OpenCV linked to it ?
Seems like it got fixed in tensorflow no ? tensorflow/tensorflow#7960