[Bug 1223576] Re: lvremove always fails on first attempt when removing snapshot
Adam Gandelman
1223576 at bugs.launchpad.net
Tue Sep 17 21:48:45 UTC 2013
** Description changed:
+ [SRU Justification]
+
+ [Impact]
+
+ * Removing LVM snapshots is unreliable on Raring on some hardware.
+ * Tools that abstract LVM actions will likely fail if they expect these actions
+ to function correctly and reliably. Specifically, OpenStack Cinder requires
+ reliability here.
+
+ [Test Case]
+
+ The following test case seems to trigger the bug on two classes of
+ hardware I've used, but not on a virtual machine:
+
+ sudo apt-get install lvm2
+ # A free block device
+ BDEV="sdb"
+
+ # Create original LVM volume.
+ pvcreate /dev/$BDEV
+ vgcreate testing-vg /dev/$BDEV
+ lvcreate -L 1024M -n testing test
+
+ # Run a snapshot create/delete cycle and observe frequent failures.
+ lvcreate -L 1024M --name testing-snapshot --snapshot /dev/testing-vg/testing
+ lvremove -f /dev/testing-vg/testing-snapshot
+
+ Example failure:
+
+ $ lvcreate -L 1024M --name testing-snapshot --snapshot /dev/testing-vg/testing
+ $ lvremove -f /dev/testing-vg/testing-snapshot
+ Logical volume "testing-snapshot" created
+ Unable to deactivate open testing--vg-testing-real (252:2)
+ Failed to resume testing.
+
+ [Solution]
+
+ Recent updates in Debian+Saucy to the LVM and dm udev rules seem to
+ alleviate the issue and I no longer see it when applying those changes
+ from lvm2 2.02.98-6ubuntu1 (Patch attached)
+
+
+
+ -------
+
# lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu Saucy Salamander (development branch)
Release: 13.10
Codename: saucy
# uname -r
3.11.0-4-generic
# dpkg -l | grep lvm2
ii lvm2 2.02.98-1ubuntu5 amd64 Linux Logical Volume Manager
Experiencing this on saucy across a number of boxes, all of similar
hardware. Unable to reproduce in a virtual machine using saucy cloud
images.
# BDEV="sdb"
# apt-get install -y lvm2
# umount /mnt
# pvcreate /dev/$BDEV
# vgcreate testing-vg /dev/$BDEV
# lvcreate -L 1024M -n testing testing-vg
- # lvcreate -L 1024M --name testing-snapshot --snapshot /dev/testing-vg/testing
- # lvremove -f /dev/testing-vg/testing-snapshot
- Unable to deactivate open testing--vg-testing-real (252:2)
- Failed to resume testing.
- # lvremove -f /dev/testing-vg/testing-snapshot
- Logical volume "testing-snapshot" successfully removed
+ # lvcreate -L 1024M --name testing-snapshot --snapshot /dev/testing-vg/testing
+ # lvremove -f /dev/testing-vg/testing-snapshot
+ Unable to deactivate open testing--vg-testing-real (252:2)
+ Failed to resume testing.
+ # lvremove -f /dev/testing-vg/testing-snapshot
+ Logical volume "testing-snapshot" successfully removed
Comparing output of 'dmsetup info' before and after failed attempts:
- - The failed attempt removes the -cow device (testing--vg-testing--snapshot-cow), but the -real and -snapshot devices remain.
- - Pre failure, the Open Count of testing--vg-testing-real is 2 (which AFAIK is to be expected). After failure, the device remains but with an Open Count of 0.
- - After successful lvremove of the snapshot, the -real device persists. On unaffected systems, the post-snapshot removal dm table is the same as it was pre-creation of snapshot. In this case, a single device (testing--vg-testing)
+ - The failed attempt removes the -cow device (testing--vg-testing--snapshot-cow), but the -real and -snapshot devices remain.
+ - Pre failure, the Open Count of testing--vg-testing-real is 2 (which AFAIK is to be expected). After failure, the device remains but with an Open Count of 0.
+ - After successful lvremove of the snapshot, the -real device persists. On unaffected systems, the post-snapshot removal dm table is the same as it was pre-creation of snapshot. In this case, a single device (testing--vg-testing)
# dmsetup info
Name: testing--vg-testing-real
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 2
Event number: 0
Major, minor: 252, 2
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw-real
Name: testing--vg-testing--snapshot
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 1
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3qlotuThv4tJMHJH7w0CN1B6kEcnNYkdv
Name: testing--vg-testing--snapshot-cow
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 1
Event number: 0
Major, minor: 252, 3
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3qlotuThv4tJMHJH7w0CN1B6kEcnNYkdv-cow
Name: testing--vg-testing
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 0
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw
# lvremove -f /dev/testing-vg/testing-snapshot
- Unable to deactivate open testing--vg-testing-real (252:2)
- Failed to resume testing.
+ Unable to deactivate open testing--vg-testing-real (252:2)
+ Failed to resume testing.
# dmsetup info
Name: testing--vg-testing-real
State: ACTIVE
Read Ahead: 0
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 2
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw-real
Name: testing--vg-testing--snapshot
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 1
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3qlotuThv4tJMHJH7w0CN1B6kEcnNYkdv
Name: testing--vg-testing
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 0
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw
# lvremove -f /dev/testing-vg/testing-snapshot
- Logical volume "testing-snapshot" successfully removed
+ Logical volume "testing-snapshot" successfully removed
# dmsetup info
Name: testing--vg-testing-real
State: ACTIVE
Read Ahead: 0
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 2
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw-real
Name: testing--vg-testing
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 0
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw
-
Output of 'udevadm monitor' with comments for contexts (also attached):
# Original LV creation
KERNEL[3890.419526] add /devices/virtual/bdi/252:0 (bdi)
KERNEL[3890.419572] add /devices/virtual/block/dm-0 (block)
KERNEL[3890.419903] change /devices/virtual/block/dm-0 (block)
UDEV [3890.420177] add /devices/virtual/bdi/252:0 (bdi)
UDEV [3890.420594] add /devices/virtual/block/dm-0 (block)
UDEV [3890.439210] change /devices/virtual/block/dm-0 (block)
KERNEL[3890.440430] change /devices/virtual/block/dm-0 (block)
UDEV [3890.458613] change /devices/virtual/block/dm-0 (block)
KERNEL[3890.493110] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
UDEV [3890.553035] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
-
# Snapshot creation
KERNEL[3915.481512] add /devices/virtual/bdi/252:1 (bdi)
KERNEL[3915.481542] add /devices/virtual/block/dm-1 (block)
KERNEL[3915.481814] change /devices/virtual/block/dm-1 (block)
UDEV [3915.482069] add /devices/virtual/bdi/252:1 (bdi)
UDEV [3915.482468] add /devices/virtual/block/dm-1 (block)
UDEV [3915.503721] change /devices/virtual/block/dm-1 (block)
KERNEL[3915.504157] change /devices/virtual/block/dm-1 (block)
KERNEL[3915.548206] add /devices/virtual/bdi/252:2 (bdi)
KERNEL[3915.548288] add /devices/virtual/block/dm-2 (block)
UDEV [3915.548503] add /devices/virtual/bdi/252:2 (bdi)
KERNEL[3915.548787] add /devices/virtual/bdi/252:3 (bdi)
KERNEL[3915.548882] add /devices/virtual/block/dm-3 (block)
UDEV [3915.549093] add /devices/virtual/block/dm-2 (block)
KERNEL[3915.549173] change /devices/virtual/block/dm-3 (block)
UDEV [3915.549240] add /devices/virtual/bdi/252:3 (bdi)
UDEV [3915.549710] add /devices/virtual/block/dm-3 (block)
UDEV [3915.553716] change /devices/virtual/block/dm-3 (block)
KERNEL[3915.563685] change /devices/virtual/block/dm-2 (block)
KERNEL[3915.563823] change /devices/virtual/block/dm-1 (block)
KERNEL[3915.563915] change /devices/virtual/block/dm-0 (block)
UDEV [3915.567734] change /devices/virtual/block/dm-2 (block)
UDEV [3915.586136] change /devices/virtual/block/dm-1 (block)
UDEV [3915.603960] change /devices/virtual/block/dm-0 (block)
UDEV [3915.611925] change /devices/virtual/block/dm-1 (block)
KERNEL[3915.625968] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
UDEV [3915.672978] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
-
# Failed snapshot delete
KERNEL[3937.161806] change /devices/virtual/block/dm-3 (block)
KERNEL[3937.161839] change /devices/virtual/block/dm-2 (block)
KERNEL[3937.161929] change /devices/virtual/block/dm-1 (block)
KERNEL[3937.162154] remove /devices/virtual/block/dm-3 (block)
KERNEL[3937.162305] remove /devices/virtual/bdi/252:3 (bdi)
KERNEL[3937.162375] remove /devices/virtual/block/dm-3 (block)
UDEV [3937.162842] remove /devices/virtual/bdi/252:3 (bdi)
UDEV [3937.169283] change /devices/virtual/block/dm-3 (block)
UDEV [3937.172103] remove /devices/virtual/block/dm-3 (block)
UDEV [3937.172217] remove /devices/virtual/block/dm-3 (block)
KERNEL[3937.176945] change /devices/virtual/block/dm-0 (block)
KERNEL[3937.177255] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
UDEV [3937.220478] change /devices/virtual/block/dm-2 (block)
UDEV [3937.221039] change /devices/virtual/block/dm-1 (block)
UDEV [3937.222593] change /devices/virtual/block/dm-0 (block)
UDEV [3937.297968] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
-
# Successful snapshot delete
KERNEL[3953.366547] remove /devices/virtual/block/dm-1 (block)
KERNEL[3953.366713] remove /devices/virtual/bdi/252:1 (bdi)
KERNEL[3953.366805] remove /devices/virtual/block/dm-1 (block)
UDEV [3953.367431] remove /devices/virtual/bdi/252:1 (bdi)
UDEV [3953.369726] remove /devices/virtual/block/dm-1 (block)
UDEV [3953.369849] remove /devices/virtual/block/dm-1 (block)
KERNEL[3953.439220] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
UDEV [3953.510027] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
** Patch added: "udev rules updates from lvm2 2.02.98-6ubuntu1 (saucy) applied to 2.02.95-6ubuntu4 (raring)"
https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1223576/+attachment/3826030/+files/lvm2_udev_updates.patch
--
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https://bugs.launchpad.net/bugs/1223576
Title:
lvremove always fails on first attempt when removing snapshot
Status in “lvm2” package in Ubuntu:
Fix Released
Status in “lvm2” source package in Raring:
New
Status in “lvm2” source package in Saucy:
Fix Released
Bug description:
[SRU Justification]
[Impact]
* Removing LVM snapshots is unreliable on Raring on some hardware.
* Tools that abstract LVM actions will likely fail if they expect these actions
to function correctly and reliably. Specifically, OpenStack Cinder requires
reliability here.
[Test Case]
The following test case seems to trigger the bug on two classes of
hardware I've used, but not on a virtual machine:
sudo apt-get install lvm2
# A free block device
BDEV="sdb"
# Create original LVM volume.
pvcreate /dev/$BDEV
vgcreate testing-vg /dev/$BDEV
lvcreate -L 1024M -n testing test
# Run a snapshot create/delete cycle and observe frequent failures.
lvcreate -L 1024M --name testing-snapshot --snapshot /dev/testing-vg/testing
lvremove -f /dev/testing-vg/testing-snapshot
Example failure:
$ lvcreate -L 1024M --name testing-snapshot --snapshot /dev/testing-vg/testing
$ lvremove -f /dev/testing-vg/testing-snapshot
Logical volume "testing-snapshot" created
Unable to deactivate open testing--vg-testing-real (252:2)
Failed to resume testing.
[Solution]
Recent updates in Debian+Saucy to the LVM and dm udev rules seem to
alleviate the issue and I no longer see it when applying those changes
from lvm2 2.02.98-6ubuntu1 (Patch attached)
-------
# lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu Saucy Salamander (development branch)
Release: 13.10
Codename: saucy
# uname -r
3.11.0-4-generic
# dpkg -l | grep lvm2
ii lvm2 2.02.98-1ubuntu5 amd64 Linux Logical Volume Manager
Experiencing this on saucy across a number of boxes, all of similar
hardware. Unable to reproduce in a virtual machine using saucy cloud
images.
# BDEV="sdb"
# apt-get install -y lvm2
# umount /mnt
# pvcreate /dev/$BDEV
# vgcreate testing-vg /dev/$BDEV
# lvcreate -L 1024M -n testing testing-vg
# lvcreate -L 1024M --name testing-snapshot --snapshot /dev/testing-vg/testing
# lvremove -f /dev/testing-vg/testing-snapshot
Unable to deactivate open testing--vg-testing-real (252:2)
Failed to resume testing.
# lvremove -f /dev/testing-vg/testing-snapshot
Logical volume "testing-snapshot" successfully removed
Comparing output of 'dmsetup info' before and after failed attempts:
- The failed attempt removes the -cow device (testing--vg-testing--snapshot-cow), but the -real and -snapshot devices remain.
- Pre failure, the Open Count of testing--vg-testing-real is 2 (which AFAIK is to be expected). After failure, the device remains but with an Open Count of 0.
- After successful lvremove of the snapshot, the -real device persists. On unaffected systems, the post-snapshot removal dm table is the same as it was pre-creation of snapshot. In this case, a single device (testing--vg-testing)
# dmsetup info
Name: testing--vg-testing-real
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 2
Event number: 0
Major, minor: 252, 2
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw-real
Name: testing--vg-testing--snapshot
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 1
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3qlotuThv4tJMHJH7w0CN1B6kEcnNYkdv
Name: testing--vg-testing--snapshot-cow
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 1
Event number: 0
Major, minor: 252, 3
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3qlotuThv4tJMHJH7w0CN1B6kEcnNYkdv-cow
Name: testing--vg-testing
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 0
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw
# lvremove -f /dev/testing-vg/testing-snapshot
Unable to deactivate open testing--vg-testing-real (252:2)
Failed to resume testing.
# dmsetup info
Name: testing--vg-testing-real
State: ACTIVE
Read Ahead: 0
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 2
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw-real
Name: testing--vg-testing--snapshot
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 1
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3qlotuThv4tJMHJH7w0CN1B6kEcnNYkdv
Name: testing--vg-testing
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 0
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw
# lvremove -f /dev/testing-vg/testing-snapshot
Logical volume "testing-snapshot" successfully removed
# dmsetup info
Name: testing--vg-testing-real
State: ACTIVE
Read Ahead: 0
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 2
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw-real
Name: testing--vg-testing
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 0
Event number: 0
Major, minor: 252, 0
Number of targets: 1
UUID: LVM-cYTNHi8q1D1wA2wl0OMDmpgLBzUBsdm3wOGeFtca62anbqn236E0g20fYFhVRXEw
Output of 'udevadm monitor' with comments for contexts (also
attached):
# Original LV creation
KERNEL[3890.419526] add /devices/virtual/bdi/252:0 (bdi)
KERNEL[3890.419572] add /devices/virtual/block/dm-0 (block)
KERNEL[3890.419903] change /devices/virtual/block/dm-0 (block)
UDEV [3890.420177] add /devices/virtual/bdi/252:0 (bdi)
UDEV [3890.420594] add /devices/virtual/block/dm-0 (block)
UDEV [3890.439210] change /devices/virtual/block/dm-0 (block)
KERNEL[3890.440430] change /devices/virtual/block/dm-0 (block)
UDEV [3890.458613] change /devices/virtual/block/dm-0 (block)
KERNEL[3890.493110] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
UDEV [3890.553035] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
# Snapshot creation
KERNEL[3915.481512] add /devices/virtual/bdi/252:1 (bdi)
KERNEL[3915.481542] add /devices/virtual/block/dm-1 (block)
KERNEL[3915.481814] change /devices/virtual/block/dm-1 (block)
UDEV [3915.482069] add /devices/virtual/bdi/252:1 (bdi)
UDEV [3915.482468] add /devices/virtual/block/dm-1 (block)
UDEV [3915.503721] change /devices/virtual/block/dm-1 (block)
KERNEL[3915.504157] change /devices/virtual/block/dm-1 (block)
KERNEL[3915.548206] add /devices/virtual/bdi/252:2 (bdi)
KERNEL[3915.548288] add /devices/virtual/block/dm-2 (block)
UDEV [3915.548503] add /devices/virtual/bdi/252:2 (bdi)
KERNEL[3915.548787] add /devices/virtual/bdi/252:3 (bdi)
KERNEL[3915.548882] add /devices/virtual/block/dm-3 (block)
UDEV [3915.549093] add /devices/virtual/block/dm-2 (block)
KERNEL[3915.549173] change /devices/virtual/block/dm-3 (block)
UDEV [3915.549240] add /devices/virtual/bdi/252:3 (bdi)
UDEV [3915.549710] add /devices/virtual/block/dm-3 (block)
UDEV [3915.553716] change /devices/virtual/block/dm-3 (block)
KERNEL[3915.563685] change /devices/virtual/block/dm-2 (block)
KERNEL[3915.563823] change /devices/virtual/block/dm-1 (block)
KERNEL[3915.563915] change /devices/virtual/block/dm-0 (block)
UDEV [3915.567734] change /devices/virtual/block/dm-2 (block)
UDEV [3915.586136] change /devices/virtual/block/dm-1 (block)
UDEV [3915.603960] change /devices/virtual/block/dm-0 (block)
UDEV [3915.611925] change /devices/virtual/block/dm-1 (block)
KERNEL[3915.625968] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
UDEV [3915.672978] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
# Failed snapshot delete
KERNEL[3937.161806] change /devices/virtual/block/dm-3 (block)
KERNEL[3937.161839] change /devices/virtual/block/dm-2 (block)
KERNEL[3937.161929] change /devices/virtual/block/dm-1 (block)
KERNEL[3937.162154] remove /devices/virtual/block/dm-3 (block)
KERNEL[3937.162305] remove /devices/virtual/bdi/252:3 (bdi)
KERNEL[3937.162375] remove /devices/virtual/block/dm-3 (block)
UDEV [3937.162842] remove /devices/virtual/bdi/252:3 (bdi)
UDEV [3937.169283] change /devices/virtual/block/dm-3 (block)
UDEV [3937.172103] remove /devices/virtual/block/dm-3 (block)
UDEV [3937.172217] remove /devices/virtual/block/dm-3 (block)
KERNEL[3937.176945] change /devices/virtual/block/dm-0 (block)
KERNEL[3937.177255] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
UDEV [3937.220478] change /devices/virtual/block/dm-2 (block)
UDEV [3937.221039] change /devices/virtual/block/dm-1 (block)
UDEV [3937.222593] change /devices/virtual/block/dm-0 (block)
UDEV [3937.297968] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
# Successful snapshot delete
KERNEL[3953.366547] remove /devices/virtual/block/dm-1 (block)
KERNEL[3953.366713] remove /devices/virtual/bdi/252:1 (bdi)
KERNEL[3953.366805] remove /devices/virtual/block/dm-1 (block)
UDEV [3953.367431] remove /devices/virtual/bdi/252:1 (bdi)
UDEV [3953.369726] remove /devices/virtual/block/dm-1 (block)
UDEV [3953.369849] remove /devices/virtual/block/dm-1 (block)
KERNEL[3953.439220] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
UDEV [3953.510027] change /devices/pci0000:00/0000:00:1c.0/0000:03:00.0/host2/port-2:1/end_device-2:1/target2:0:1/2:0:1:0/block/sdb (block)
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