[linux-lvm] lvm Bug? - bad reaction to snapshot creation

Marian Csontos mcsontos at redhat.com
Mon Jun 9 10:08:58 UTC 2014

On 06/09/2014 11:50 AM, Zdenek Kabelac wrote:
> Dne 7.6.2014 01:26, Leeman Strout napsal(a):
>> Creating a snapshot throws an error "Attempted to decrement suspended
>> device
>> counter below zero." but succeeds.  Removing the snapshot fails,
>> attempting a
>> 2nd time succeeds.  Somewhere in this process the original LV gets
>> locked and
>> the system needs to be restarted to unlock it.  As explained below this
>> happens intermittently but regularly.
>> Any additional info please let me know directly, I am not a subscriber,
> Hi
> Unsure if this relates to all your problem (since I'm not sure how arch
> linux
> is in sync with udev rules & systemd version)
> At certain moment  systemd added a new 'feature' about locking devices
> while
> updating internal udev state - this locking ignores any udev rule flags
> and opens internal lvm2 devices - so while for now it's been again
> disabled for 'dm' devices - you might have installed version of system
> which has the 'lock everything' feature in?
> Thought this doesn't explain your 'counter below zero' error - this
> looks like
> some incorrect udev rules are running in the field ?
> (Or maybe multiple  systemd-udevd are running ?)

There is also a recent BZ against RHEL7:


What are the devices used in the stack?

-- Martian

> Zdenek
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