FWIW we got an instance with kernel 3.16.0-29-generic #39-Ubuntu hitting this bug, we don't use docker but we run lxc, we also don't have a reliable reproducer and the only way to notice this kernel is also affected was too boot it in production and wait the bug to happen (usually when we have container stoping and starting).
FWIW we got an instance with kernel 3.16.0-29-generic #39-Ubuntu hitting this bug, we don't use docker but we run lxc, we also don't have a reliable reproducer and the only way to notice this kernel is also affected was too boot it in production and wait the bug to happen (usually when we have container stoping and starting).