Bug#807279: lvm2: Monitoring v1/snapshot0 failed.

[Bob Proulx]

Package: lvm2
Version: 2.02.133-1
Severity: normal

Snapshot creation reports a failure using Sid but not Jessie 8 Stable.

  # lvs | sed 's/  *$//' | grep -e LV -e root
    LV    VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
    root  v1   -wi-ao----  16.00g

Creating a snapshot reports a failure.

  # lvcreate -s -n rootsnap -L10G v1/root
    Monitoring v1/snapshot0 failed.
    Logical volume "rootsnap" created.

  # lvremove -f v1/rootsnap
    Logical volume "rootsnap" successfully removed

However if enough space is provided it does not.

  # lvcreate -s -n rootsnap -L20G v1/root
    Reducing COW size 20.00 GiB down to maximum usable size 16.07 GiB.
    Logical volume "rootsnap" created.

That works on stable without any failures reported.

  # lvs | sed 's/  *$//' | grep -e LV -e root
    LV       VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
    root     e1   -wi-ao----   5.59g

  # lvcreate -s -n rootsnap -L4G e1/root
    Logical volume "rootsnap" created

I have searched but I can't find any documentation on what monitoring
is happening here and what it means to have it failed.  Even with that
failure report the LV created seems usable.  But of course reported
failures should not be ignored.

Bob


-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.2.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages lvm2 depends on:
ii  dmeventd                  2:1.02.110-1
ii  dmsetup                   2:1.02.110-1
ii  init-system-helpers       1.24
ii  initscripts               2.88dsf-59.2
ii  libc6                     2.21-3
ii  libdevmapper-event1.02.1  2:1.02.110-1
ii  libdevmapper1.02.1        2:1.02.110-1
ii  liblvm2app2.2             2.02.133-1
ii  libreadline5              5.2+dfsg-3+b1
ii  libudev1                  228-2
ii  lsb-base                  9.20150917

lvm2 recommends no packages.

Versions of packages lvm2 suggests:
pn  thin-provisioning-tools  <none>

-- no debconf information