Comment 12 for bug 1760173

On Mon, Apr 30, 2018, 12:41 Ryan Harper <email address hidden> wrote:

> On Mon, Apr 30, 2018 at 12:14 PM, Colin Ian King
> <email address hidden> wrote:
> > The code actually polls /dev/zfs until it appears. The issue here is
> > that it does not appear after 10 seconds, and then it gives up.
>
> Yes, you're right.
>
> Would it make sense to have zfsutils know it's running in a container?
>

I think "running in a container" is too strong but making it smarter by
dropping the timeout and simply reporting an error could work if it doesn't
regress on the host. Which I don't expect it to. I haven't given up playing
with devtmpfs and we are on our way to getting quite close to properly
delegated devices by user namespace.

> >
> > --
> > You received this bug notification because you are subscribed to the bug
> > report.
> > https://bugs.launchpad.net/bugs/1760173
> >
> > Title:
> > zfs, zpool commands hangs for 10 seconds without a /dev/zfs
> >
> > To manage notifications about this bug go to:
> >
> https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/1760173/+subscriptions
>
> --
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> https://bugs.launchpad.net/bugs/1760173
>
> Title:
> zfs, zpool commands hangs for 10 seconds without a /dev/zfs
>
> Status in lxd package in Ubuntu:
> New
> Status in zfs-linux package in Ubuntu:
> Triaged
>
> Bug description:
> 1. # lsb_release -rd
> Description: Ubuntu 16.04.4 LTS
> Release: 16.04
>
> 2. # apt-cache policy zfsutils-linux
> zfsutils-linux:
> Installed: 0.6.5.6-0ubuntu19
> Candidate: 0.6.5.6-0ubuntu19
> Version table:
> *** 0.6.5.6-0ubuntu19 500
> 500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64
> Packages
> 100 /var/lib/dpkg/status
>
> 3. When inside a lxd container with zfs storage, zfs list or zpool
> status either return or report what's going on.
>
> 4. When inside a lxd container with zfs storage, zfs list or zpool
> status appears to hang, no output for 10 seconds.
>
> strace reveals that without a /dev/zfs the tools wait for it to appear
> for 10 seconds but do not provide a command line switch to disable or
> make it more verbose.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 16.04
> Package: zfsutils-linux 0.6.5.6-0ubuntu19
> ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
> Uname: Linux 4.13.0-36-generic x86_64
> ApportVersion: 2.20.1-0ubuntu2.15
> Architecture: amd64
> Date: Fri Mar 30 18:09:29 2018
> ProcEnviron:
> TERM=xterm-256color
> PATH=(custom, no user)
> LANG=C.UTF-8
> SourcePackage: zfs-linux
> UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/lxd/+bug/1760173/+subscriptions
>