Bug 1100138

Summary:	some operation cause "lvremove" can not find the object
Product:	[Community] Virtualization Tools	Reporter:	bfan
Component:	libguestfs	Assignee:	Richard W.M. Jones <rjones>
Status:	NEW ---	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	leiwang, linl, ptoscano, wshi
Target Milestone:	---	Keywords:	Reopened
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1100140 (view as bug list)		Environment:
Last Closed:	2025-10-17 00:10:10 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1100140, 1288337

Description bfan 2014-05-22 05:58:40 UTC

Description of problem:
1. create a LV on /dev/sda1, then re-partition /dev/sda1 without remove LV
2. reload disk and re-partition again, we can see LV still exists.
3. LV can't be removed


Version-Release number of selected component (if applicable):
libguestfs-1.22.6-22.el7.x86_64


How reproducible:
100%


Steps to Reproduce:
1. create a disk.
# dd if=/dev/zero of=/tmp/lvmtest.img bs=1M count=1024

2.  create a lvm on /dev/sda1, then re-partition /dev/sda1 without remove lvm.
(All commands in one line)
# guestfish -a /tmp/lvmtest.img run : part-disk /dev/sda msdos : pvcreate /dev/sda1 : vgcreate vg /dev/sda1 : lvcreate lv vg 50 : lvs : part-disk /dev/sda msdos
/dev/vg/lv
libguestfs: error: part_disk: parted: /dev/sda: Error: Partition(s) 1 on /dev/sda have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot now before making further changes.

3. reload disk , re-partition and do lvremove
# guestfish -a /tmp/lvmtest.img run : part-disk /dev/sda msdos : lvs : lvremove /dev/vg/lv


Actual results:
libguestfs: error: lvremove: lvremove_stub: /dev/vg/lv: No such file or directory


Expected results:
lv can be removed.


Additional info:
Same operation on rhel7 guest, LV can be removed successfully

# parted -s -- /dev/xvdb mklabel msdos mkpart primary 128s -128s
# lvm pvcreate --force /dev/xvdb1
# lvm vgcreate vg /dev/xvdb1
# lvm lvcreate -L 50 -n lv vg
# parted -s -- /dev/xvdb mklabel msdos mkpart primary 128s -128s

After reboot,
# parted -s -- /dev/xvdb mklabel msdos mkpart primary 128s -128s
# lvremove /dev/vg/lv

Comment 1 Richard W.M. Jones 2014-05-22 07:39:34 UTC

I think LVM gets confused temporarily, but it doesn't seem to
be "exploitable" in any way.  ie. You cannot create a disk image
which libguestfs cannot handle.

Simpler procedure for displaying the error:

$ guestfish -N lv -- -part-disk /dev/sda mbr
$ guestfish -a test1.img run : part-disk /dev/sda mbr : lvs : lvremove /dev/VG/LV

The second command prints:

/dev/VG/LV
libguestfs: error: lvremove: lvremove_stub: /dev/VG/LV: No such file or directory

I guess we might consider doing a wipefs all operations that
create a new partition table.

Comment 2 Richard W.M. Jones 2014-05-22 07:42:47 UTC

(In reply to Richard W.M. Jones from comment #1)
> I guess we might consider doing a wipefs all operations that
                                       ^before^
> create a new partition table.

Comment 5 Richard W.M. Jones 2015-09-23 14:34:09 UTC

Bug still happens (even upstream).

Comment 7 Richard W.M. Jones 2016-06-27 15:44:59 UTC

Still happens (even upstream).  However as this is low priority
I'm moving it to RHEL 7.4.

Comment 8 Richard W.M. Jones 2017-02-16 14:50:53 UTC

We may as well handle this upstream.  It's a very contrived test
case which would not affect RHEL customers.

Comment 9 Red Hat Bugzilla 2025-10-17 00:10:10 UTC

This product has been discontinued or is no longer tracked in Red Hat Bugzilla.

Comment 10 Alasdair Kergon 2025-10-17 12:52:13 UTC

Reopening because Virtualization Tools has not been discontinued.