Created sysfs files are not immediately ready for using.

[sardok]

Created sys files (by means of exporting) need some time to update their uid/guid before using.

This symptom could be seen when gpio's direction file is failed to be written even though uid/gid of the file permits that.

[troelsim]

I am running into this issue too. My solution is to simply retry _configure_option on IOError before failing. I'll make a PR and you can check it out.