One box completely froze again (ssh does not respond any more), attaching dmesg. However, I'm not sure that this actually contains what you were looking for -- there is a lot of the usual chatter from starting/stopping containers, and then some traces about hung tasks when trying to flush the file system (I have /srv on btrfs so that containers have some acceptable performance -- but NB that this also happened in my earlier experiments on plain ext4).
Do I need to do anything to enable the extra debugging you added? Or is that perhaps not in dmesg?
One box completely froze again (ssh does not respond any more), attaching dmesg. However, I'm not sure that this actually contains what you were looking for -- there is a lot of the usual chatter from starting/stopping containers, and then some traces about hung tasks when trying to flush the file system (I have /srv on btrfs so that containers have some acceptable performance -- but NB that this also happened in my earlier experiments on plain ext4).
Do I need to do anything to enable the extra debugging you added? Or is that perhaps not in dmesg?