udev upgrade on ovirt 3.5 /el6 causes incorrect storage ownership - cannot activate host due permission denied - Users

26 Aug 2016

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Hi, after a last yum update, udev assigned incorrect /dev/dm-* ownership 
for ovirt storage. The default storage is owned by "root.disk" instead 
of "vdsm.qemu". The vdsm udev cfg file is unchanged.

Package udev.x86_64 0:147-2.73.el6 WORKS

Package udev.x86_64 0:147-2.73.el6_8.1 DOESN'T

Looks like a behavior change in udev - 
https://rhn.redhat.com/errata/RHBA-2016-1659.html

This update fixes the following bug:

* Previously, the udev daemon reset permissions on a device node on both
"change" and "add" kernel sysfs events. After a "change" event was 
generated for
an underlying block device, permissions on a virtual disk of a virtual 
machine
(VM) were reset. Consequently, a qemu process accessing the virtual disk
encountered a "Permission denied" error, which caused problems during live
migrations of VMs. The udev service has been patched, and it now sets
permissions on a device node only on "add" events or in cases when udev 
created
a new device node. The behavior of the udev service is now similar to 
Red Hat
Enterprise Linux 7. (BZ#1362038)

-- 
Ernest Beinrohr, AXON PRO
Ing <http://www.beinrohr.sk/ing.php>, RHCE 
<http://www.beinrohr.sk/rhce.php>, RHCVA 
<http://www.beinrohr.sk/rhce.php>, LPIC 
<http://www.beinrohr.sk/lpic.php>, VCA <http://www.beinrohr.sk/vca.php>,
+421-2-62410360 +421-903-482603

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    <p>Hi, after a last yum update, udev assigned incorrect /dev/dm-*
      ownership for ovirt storage. The default storage is owned by
      "root.disk" instead of "vdsm.qemu". The vdsm udev cfg file is
      unchanged.<br>
    </p>
    <br>
    <br>
    Package udev.x86_64 0:147-2.73.el6 WORKS<br>
    <br>
    Package udev.x86_64 0:147-2.73.el6_8.1 DOESN'T <br>
    <br>
    Looks like a behavior change in udev -
    <a class="moz-txt-link-freetext" href="https://rhn.redhat.com/errata/RHBA-2016-1659.html">https://rhn.redhat.com/errata/RHBA-2016-1659.html</a><br>
    <br>
    This update fixes the following bug:<br>
    <br>
    * Previously, the udev daemon reset permissions on a device node on
    both<br>
    "change" and "add" kernel sysfs events. After a "change" event was
    generated for<br>
    an underlying block device, permissions on a virtual disk of a
    virtual machine<br>
    (VM) were reset. Consequently, a qemu process accessing the virtual
    disk<br>
    encountered a "Permission denied" error, which caused problems
    during live<br>
    migrations of VMs. The udev service has been patched, and it now
    sets<br>
    permissions on a device node only on "add" events or in cases when
    udev created<br>
    a new device node. The behavior of the udev service is now similar
    to Red Hat<br>
    Enterprise Linux 7. (BZ#1362038)<br>
    <br>
    <div class="moz-signature">-- <br>
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        <span style="font-family: Lucida Console, Luxi Mono, Courier,
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          Ernest Beinrohr, AXON PRO<br>
          <a style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/ing.php">Ing</a>, <a
            style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/rhce.php">RHCE</a>, <a
            style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/rhce.php">RHCVA</a>, <a
            style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/lpic.php">LPIC</a>, <a
            style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/vca.php">VCA</a>, <br>
          +421-2-62410360 +421-903-482603
          <br>
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udev upgrade on ovirt 3.5 /el6 causes incorrect storage ownership - cannot activate host due permission denied

Ernest Beinrohr

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