[Bug 631795] Re: Udev has a race condition with device mapper devices

[Sergey]

ubuntu server 12.04 x64

As well as markusj, i'm affected by issue with removing snapshot of
logical volume.

sudo /sbin/lvcreate -l 5895 -s -n tsbackup /dev/vg1/vdata
sudo /sbin/lvremove -f /dev/vg1/tsbackup
syslog: (twice)
udevd[14958]: inotify_add_watch(6, /dev/dm-1, 10) failed: No such file or directory
udevd[14958]: inotify_add_watch(6, /dev/dm-1, 10) failed: No such file or directory

Snapshot is deleted successfully. Only udev events.
On older server 10.04 x64 this error not present. Сonfiguration of both servers is identical.

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https://bugs.launchpad.net/bugs/631795

Title:
  Udev has a race condition with device mapper devices

Status in “linux” package in Ubuntu:
  Triaged
Status in “udev” package in Ubuntu:
  Triaged

Bug description:
  When using lvm and/or dmraid devices, often times during boot up udev
  prints messages like:

  udevd-work[72]: inotify_add_watch(6, /dev/dm-6, 10) failed: No such
  file or directory

  I believe this is caused by a race condition somewhere causing udev to
  attempt to access the newly created dm device before the dev node
  actually appears in /dev.  Sometimes it seems to get as far as running
  blkid before the dev node appears, causing it to fail to identify the
  UUID of the device and create the /dev/disk/by-uuid symlinks.

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