Re: [linux-lvm] hangs when mounting snapshot

[Tracy R Reed <treed@ultraviolet.org>]

Hello again. I upgraded to util-linux-2.10o which includes the latest version
of mount and it is still hanging when mounting snapshots. It segfaults first,
then hangs on the next attempt. Is there anything else I need to upgrade to get
this working? 

On Wed, Sep 20, 2000 at 10:50:21PM -0700, Tracy R Reed wrote:
> Over the past few weeks I have been playing around with LVM with great success.
> However, I have been experimenting with snapshots recently and run into a
> problem. I have tried this with reiserfs and ext2 as the filesystem (not that
> it should matter to LVM but I mention it because mount is involved) and get
> identical results.
> 
> I am using kernel 2.4.0-test6 and lvm_0.8final.
> 
> I created a snapshot like so:
> 
> # lvcreate --size 16m --snapshot --name snap /dev/test_vg/test_lv 
> lvcreate -- WARNING: all snapshots will be disabled if more than 16 MB are changed
> lvcreate -- INFO: using default snapshot chunk size of 64 KB
> lvcreate -- doing automatic backup of "test_vg"
> lvcreate -- logical volume "/dev/test_vg/snap" successfully created
> 
> Everything looks cool:
> 
> # lvscan
> lvscan -- ACTIVE   "/dev/another_test_vg/another_test_lv" [300 MB]
> lvscan -- ACTIVE   "/dev/test_vg/test_lv" [63.91 GB] striped[2]
> lvscan -- ACTIVE   "/dev/test_vg/snap" [63.91 GB] striped[2]
> lvscan -- 3 logical volumes with 128.12 GB total in 2 volume groups
> lvscan -- 3 active logical volumes
> 
> Then I try to mount it with:
> 
> # mount /dev/test_vg/snap /snap1
> Segmentation fault
> 
> Then I try:
> 
> # mount /dev/test_vg/snap /snap1
> 
> which hangs the mount command. The rest of the system is ok but not even kill
> -9 can get rid of that mount command. The system won't reboot properly because
> it hangs when trying to unmount filesystems and I have to hit the switch.
> 
> Any ideas? Do I need to update my version of mount to support snapshots or
> something?
> 
> -- 
> Tracy Reed      http://www.ultraviolet.org
> 

-- 
Tracy Reed      http://www.ultraviolet.org