Ubuntu
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  1. Bug #1403152
  2. Comment #24

Comment 24 for bug 1403152

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Dave Richardson (pudnik019) wrote :

Ok, I've got a minimal reproducer ready. It causes the bug when I run it on Ubuntu 14.04 with 3.13.0-24-generic and LXC version 1.0.7-0ubuntu0.1 0. It's python, and the script has some documentation describing its usage as well as the prerequisites. You should run it as root via sudo.

Prereqs require you to install a base ubuntu trusty container, install nfs-common in that container, and modify lxc-default to allow containers to perform NFS mounts. You will also need an NFS share that your containers can mount to scribble data to. The address of this share is passed as the third parameter to the script in the form of IP_ADDRESS:/path/to/nfs/share.

My typical usage looks like:

sudo ./reproducer.py 5 10 IPADDRESS:/path/to/nfs/share

Which starts 5 threads that in each of 10 iterations, creates a container, mounts the nfs share to /mnt, then dd's over some zeros, umounts /mnt, stops, and destroys the container. I can reliably hit the unregister_netdevice hang within 1 minute of running this.

~Dave