Ubuntu boot hang up with kernel 3.0.0-15 and lvm2

Today, I updated my Ubuntu box and a new kernel has been installed (3.0.0-15 x86_64).

At boot, my system hangs up just after the /scripts/init-bottom phase.

I tried with kernel 3.0.0-14, the behavior is the same. The latest working kernel was 3.0.0-13.

After digging, it’s when the init-bottom performs vgchange -a y.

The problem is that the script is waiting for the udev device, and starting from kernel 3.0.0-14, it doesn’t work and we raise the timeout.
So it means that the startup is not totally stuck, it just takes long long long time 😉

The workaround is to disable the udev support during LVM2 vgchange.

To do that, edit the /lib/udev/rules.d/85-lvm2.rules and add the --noudevsync option to vgchange:


SUBSYSTEM=="block", ACTION=="add|change", ENV{ID_FS_TYPE}=="lvm*|LVM*", \
RUN+="watershed sh -c '/sbin/lvm vgscan; /sbin/lvm vgchange --noudevsync -a y'"

We have to update the initramfs:


update-initramfs -u -k all

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