[systemd-devel] 220 udev boot regression: timeout, giving up waiting for workers to finish

[Tom Gundersen]

On Tue, May 26, 2015 at 5:11 PM, Martin Pitt <martin.pitt at ubuntu.com> wrote:
> Hello Tom, all,
>
> with 220 I get a severe boot time regression:
>
>   $ systemd-analyze
>   Startup finished in 30.751s (kernel) + 11.706s (userspace) = 42.458s
>
> which used to be
>
>   $ systemd-analyze
>   Startup finished in 703ms (kernel) + 890ms (userspace) = 1.593s
>
> (this is a VM)
>
> It seems udevd --daemon spends 30 seconds timing out in the initramfs:
>
>   [    0.384519] systemd-udevd[55]: starting version 220
>   [   30.736381] systemd-udevd[56]: timeout, giving up waiting for workers to finish
>
> and then some more in the real root:
>
>    $ systemd-analyze blame
>      10.826s dev-vda1.device
>      10.067s systemd-tmpfiles-setup-dev.service
>      10.031s systemd-sysctl.service
>      10.019s systemd-journald.service
>      10.005s sys-fs-fuse-connections.mount
>      10.001s tmp.mount
>
> (full journal at http://paste.ubuntu.com/11372265/, but it's not very
> useful)
>
> I bisected this to
>
>   http://cgit.freedesktop.org/systemd/systemd/commit/?id=e237d8c
>   udevd: move file descriptors to Manager
>
> this is hard to revert individually as there are lots of other recent changes
> in udev around this commit, but any version before that commit is fast
> and doesn't give that timeout error.
>
> Current trunk as of commit 185abfc3 still has that problem, so it
> wasn't fixed by one of the recent udev commits.
>
> Does anyone else see this too? Any idea what causes this?

FWIW, I'm looking into this.

Cheers,

Tom