Ubuntu
xen package

memory leak in xl

Bug #1484682 reported by Piotr Meyer
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
xen (Debian)
Fix Released
Unknown
xen (Ubuntu)
New
Undecided
Unassigned

Bug Description

With xen-utils-4.4 (4.4.1-0ubuntu0.14.04.6) I step into problem thats looks like one, described in <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=767295> (that is already fixed in Debian).

Memory is leaked after every domU start and restart, exactly like in: <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=767295#35>

Additional informations:

# uname -a
Linux mewa 3.13.0-61-generic #100-Ubuntu SMP Wed Jul 29 11:21:34 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.3 LTS"

Revision history for this message
Piotr Meyer (aniou+launchpad) wrote :

Looks like patches are already included in upstream and 4.4.2 is already fixed: http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=30f10d4d2b102bd7184b84c9cc3d2246f060706a

Revision history for this message
Simon Déziel (sdeziel) wrote :

Piotr, Xen 4.4.2 made it into trusty-proposed (https://bugs.launchpad.net/bugs/1476666) so maybe you'd like to give it a try?

Revision history for this message
Piotr Meyer (aniou+launchpad) wrote :

Problems described in first parts of Debian's bug report was gone after update, although a problem with "pseudo-leak", explained in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=767295#75 (and few following messages) still exists.

As far I understand second part of bugreport describes problems that leads to some inconvenient and doubtful messages during creating/rebooting domU's when memory balloning is disabled, but aren't very grave in general (although patches are available in Debian repository - as specific for glibc they are not pushed upstream, I suppose).

In general, where balloning is disabled, kernel complains few (about twenty, to be honest) times during creating/restarting domU:

xen:balloon: Cannot add additional memory (-17)

Enabling balloning, for example by dom0_mem=1536M,max:2048M "fixes" problem, although it is may be troublesome in environments with very small memory amount assigned to dom0 (as stated in mentioned thread in Debian's bugzilla).

Revision history for this message
Robie Basak (racb) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better.

What needs to be done next? If some problems still remain, it's fair to track those in a bug, though in that case do the Debian bug and upstream commit you've identified not correspond to a fix for the remaining issue?

Bug Watch Updater (bug-watch-updater)
Changed in xen (Debian):
status: Unknown → Fix Released
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