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[linux-lvm] lvremove snapshot hangs LVM system

I've read about that in the mailing list, but all the messages were quite old, and always referencing old kernels, so I decided to post it again.

My system is as follows:
Linux 2.6.32-131.17.1.el6.x86_64 #1 SMP Wed Oct 5 17:19:54 CDT 2011 x86_64 x86_64 x86_64 GNU/Linux


I am running LVM as a cluster as:
clvmd -T30

The discs on the LVM groups are all on a SAN connected with FC.

I am working in a two-node cluster.

As I needed to use the snapshot features I have some volumes just active in one of the nodes. As far as I know this is the only way to snapshot volumes.

Everything works fine. I am able to create volumes. I am able to put volumes in "exclusive use" and it gives me the capability of snapshot. Snapshooting works fine.

My problem comes when I "lvremove" a snapshot. It seems to work fine, and the snapshot is removed, but, whatever LVM command I execute after that hangs forever in an "uninterruptible sleep" (D).

After that, for a while, I can see some errors on the log(attached messages.log). After a while those messages stop, but LVM command yet won't respond.

The rest of the system works perfectly, the only problem is that I cannot make modifications on LVM system.

The only way to solve the problem is by rebooting the machine.

As a note say this only happens "lvremoving" a snapshot. Removing a volume works fine.

I don't know if I am doing something wrong, as I read that problem use to happen with older versions but it was supposedly solved.

Does someone else have this problem?

Thanks a lot.

Attachment: messages.log
Description: Binary data

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