Bug 88977 - (LVM) Serious LVM regression (snapshots broken) +patch
Summary: (LVM) Serious LVM regression (snapshots broken) +patch
Status: CLOSED DUPLICATE of bug 84278
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: kernel
Version: 9
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Stephen Tweedie
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2003-04-15 22:05 UTC by Dax Kelson
Modified: 2007-04-18 16:53 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2006-02-21 18:52:42 UTC

Attachments (Terms of Use)

Description Dax Kelson 2003-04-15 22:05:12 UTC
Description of problem:
In kernels 2.4.20-8 and 2.4.20-9, LVM snapshots no longer work. They did work
fine in RHL8.0.

Version-Release number of selected component (if applicable):


How reproducible:

Every time

Steps to Reproduce:
1. Create LVM LV
2. Create LVM snapshot with:

lvcreate --size 100M --snapshot --name snap1 /dev/vg01/wwwdata

3. Try to mount/use snapshot block device:

# mount /dev/vg01/snap1 /mnt/snapshot
mount: block device /dev/vg01/snap1 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/vg01/snap1, or too
many mounted file systems

Additional info:

LVM snapshots are a very important feature and are often used. Some would argue
that they are the most commonly used and most useful feature of LVM (given that
 live -- while mounted -- resizes don't work yet). We use LVM snapshots to get
consistent backups.  This seems a quite high priority problem to get fixed ASAP.

Comment 1 G. Reno 2003-04-21 15:58:14 UTC
Absolutely agree.  Very critical for backup consistency.

Comment 2 Matthew Kent 2003-05-05 21:35:20 UTC
See my attachment in 


for a fix, don't kill me if it doesnt work for you. I'm using it on a 
production box for mysql backups and it's been alright so far.

Comment 3 Dax Kelson 2003-05-23 00:47:44 UTC
Stephen, can you comment on how RH views the severity of this bug, and if a fix
for this will make into the next RHL9 errata kernel?

Comment 4 Graham King 2003-06-05 20:24:17 UTC
This has also been reported as

My backup devices are external USB disk with OHCI driver, for which I am forced
to upgrade this RH8.0 installation from 2.4.18-14 in order to avoid a system
freeze (described in https://rhn.redhat.com/errata/RHSA-2003-135.html).  The
current inability to mount snapshots is therefore of critical importance to me.

Comment 5 Alan Cox 2003-06-08 14:39:51 UTC

*** This bug has been marked as a duplicate of 84278 ***

Comment 6 Red Hat Bugzilla 2006-02-21 18:52:42 UTC
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.

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