Bug#549691: lvm2: lvremove fails to remove open logical volume which is not opened

[Michael Stapelberg]

Hi,

I have the same problem. lvremove fails to remove snapshot LVs in many
cases (but not 100% of the time).

As a workaround, I am currently using the "dmsetup remove" trick.

What can we do to fix this problem?

Here are the software versions I’m using:

lvm2               2.02.95-4
udev               175-3.1
dmsetup            2:1.02.74-4
libdevmapper1.02.1 2:1.02.74-4
systemd            44-4
linux-image-3.5.0  3.5.0-10.00.Custom (with Debian config)

The machine is an x86_64 AMD Athlon II X2 250.

I don’t have udisks installed, so I don’t have a file called
/lib/udev/rules.d/80-udisks.rules either. The suggested solution
from the RedHat bugzilla therefore is not applicable in my case.

To give a bit more information about how I reproduce this issue:

    lvcreate -n snap_web -L 1G -s plana/domu-web
    kpartx -a /dev/mapper/plana-snap_web
    mount /dev/mapper/plana-snap_web1 /mnt/snap_web

    # Run backup

    umount /mnt/snap_web
    kpartx -d /dev/mapper/plana-snap_web
    lvremove -f plana/snap_web

I have also tried using maximum verbosity and stracing lvremove,
but I don’t understand enough of how lvremove should work to
make any sense out of it (even when comparing the working and
non-working strace output).

Best regards,
Michael