Bug#867368: systemd-udevd: delays boot for 2+ minutes when LVM PV is inside a LV

[Michael Biebl]

Control: reassign -1 lvm2

On Thu, 6 Jul 2017 13:22:38 -0700 Rob Leslie <rob at mars.org> wrote:
> > On Jul 6, 2017, at 8:03 AM, Felipe Sateler <fsateler at debian.org> wrote:
> > 
> > > % systemd-analyze
> > > Startup finished in 2min 55.491s (kernel) + 13.076s (userspace) = 3min 8.568s
> > 
> > This suggests the kernel is the one slowing things down.
> 
> I initially thought so too, but attempts to debug the kernel with e.g.
> 'initcall_debug' were not fruitful. Instead indications point to something
> happening in early initramfs userspace.
> 
> > Can you try booting with the old jessie kernel? This looks like a kernel regression.
> 
> I have confirmed that the problem still exists even when booting a stretch
> system using the most recent jessie kernel.
> 
> I have tried modifying the initramfs scripts to arrange for systemd-udevd to be
> passed the '--debug' option. Here are some relevant excerpts:
> 
> > % grep 793 systemd-udevd.debug
> > seq 793 queued, 'change' 'block'
> > seq 793 running
> > seq 793 '/devices/virtual/block/dm-2' is taking a long time
> 
> > % tail -n 5 systemd-udevd.debug 
> > giving up waiting for workers to finish
> > event loop failed: Connection timed out
> > Unload module index
> > Unloaded link configuration context.
> > timeout '/sbin/lvm pvscan --cache --activate ay --major 253 --minor 2'
> 
> 
> This of course suggests the problem may actually lie with lvm2. Please feel free
> to reassign if you agree, or suggest a further course of investigation.

This does look like it might be a lvm2 bug indeed, which is why I'm
going to reassign this bug now, as I think the lvm2 maintainers have a
better chance helping you debug this.
If this turns out to be a bug in udev, please reassign back.

Regards,
Michael


-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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