Comment 12 for bug 1465322

Agesp: In response to your question about whether or not this impacts other software, I can tell you that it affects our Ruby on Rails app in production. I'm not sure what is triggering it -- it may be IRB, rails, or a gem that we have, but there is a constant stream of these messages on stderr when the rails console ('rails c') is loaded:

deploy@ip-10-0-0-41:/var/www/current$ rails c
Loading production environment (Rails 4.1.10)
20150622025515(production) > df: `/sys/kernel/debug': Function not implemented
df: `/sys/kernel/debug': Function not implemented
df: `/sys/kernel/debug': Function not implemented
df: `/sys/kernel/debug': Function not implemented
...

I get a message every few seconds without any user interaction.

Obviously there is a simple workaround here -- 'rails c 2>/dev/null`. But it would be nice to have stderr back at some point. :)

Thanks,

Andy