[Bug 744293] [NEW] Infinite loop in helper LVM script for DRBD 8 in Lucid

[Numérigraphe]

Public bug reported:


The script /usr/lib/drbd/snapshot-resync-target-lvm.sh shipped with drbd
v8.3.7 in Lucid fails to read its command line options and falls into an
infinite loop.

This bug is not in present in natty, but I humbly request an SRU to
Lucid.

This script can be called by DRBD to create an LVM snapshot of a
resource before it starts resyncing (thus becoming inconsistent). This
script is present (though commented out) in the default drbd
configuration file /etc/drbd.d/global_common.conf .

This bug can result in drbd silently failing to resync an outdated
resource. Thus, any newer data will be lost if the cluster fails over to
the outdated node.

This is a known problem upstream and it was fixed in later versions of
DRBD. The following patch was committed upstream to address this bug :
http://git.drbd.org/?p=drbd-8.3.git;a=commitdiff;h=1fd3ad953663615e946167191e1d9885af81450a

Steps to reproduce:
On a cluster composed of node A and node B:
 - on both nodes, uncomment the line "before-resync-target "/usr/lib/drbd/snapshot-resync-target-lvm.sh -p 15 -- -c 16k";"
 - on both nodes, configure a drbd resource called "test"
 - make the initial synchronization
 - on B, do "drbdadm disconnect test"
 - nn A, make "test" primary and write to it
 - on B, do "drbdadm connect test"
 => the script will kick in and fall in an endless loop - top will show it using 100% CPU.

lsb_release -rd
Description:	Ubuntu 10.04.2 LTS
Release:	10.04

apt-cache policy drbd8-utils
drbd8-utils:
  Installé : 2:8.3.7-1ubuntu2.1
  Candidat : 2:8.3.7-1ubuntu2.1
 Table de version :
 *** 2:8.3.7-1ubuntu2.1 0
        500 http://fr.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     2:8.3.7-1ubuntu2 0
        500 http://fr.archive.ubuntu.com/ubuntu/ lucid/main Packages

Lionel Sausin.

** Affects: drbd8 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/744293

Title:
  Infinite loop in helper LVM script for DRBD 8 in Lucid