[Bug 571093] Re: [SRU] multipath + libvirtd eats away more memory over time

Dustin Kirkland dustin.kirkland at gmail.com
Mon May 24 17:35:02 BST 2010


** Description changed:

  libvirtd fills the memory, until the libvirtd process gets killed. This happens over a long time.
  - This server (info by ubuntu-bug) has 4GB of memory and an uptime of 27 days. Some KVM machines have been active during that period. The last 4 days before the crash, no virtual machine was running on the server, but libvirtd slowly filled memory.
  - Another server has 32 GB of memory and active virtual machines. It took a few weeks more until memory was completely filled.
  
  Steps to reproduce:
  - Start libvirtd
  - Wait a long time
  
  ProblemType: Bug
  Architecture: amd64
  Date: Wed Apr 28 08:43:52 2010
  DistroRelease: Ubuntu 9.10
  Package: libvirt-bin 0.7.0-1ubuntu13.1
  ProcEnviron:
-  LANG=C
-  SHELL=/bin/bash
+  LANG=C
+  SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.31-20.58-server
  SourcePackage: libvirt
  Uname: Linux 2.6.31-20-server x86_64
+ 
+ ======
+ SRU:
+  * IMPACT: If affected, libvirtd will eventually leak all memory, and OOM the system.
+  * ADDRESSED: Applied patch solves two memory leaks by freeing memory on function exit conditions.
+  * PATCH: As attached from Nigel Jones below.  He has also submitted this upstream as well.
+  * TEST CASE: In some cases, you can reproduce this issue by running "top -p $(pidof libvirtd)" in one window, watching RES memory usage increase, while running "while true; do sudo multipath -F; sudo multipath -v4; done" in another window.  Due to a race condition (see Bug: #585027), this will sometimes not reproduce the issue by itself.  In these cases, you can "simulate" the race condition by "sudo dmsetup remove <string>", and then running the commands above.
+  * REGRESSION POTENTIAL: Patch is pretty simple, clean.  Regression potential should be minimal.
+ ======

** Changed in: libvirt (Ubuntu)
       Status: In Progress => Fix Committed

** Changed in: libvirt (Ubuntu Lucid)
       Status: In Progress => Fix Committed

-- 
[SRU] multipath + libvirtd eats away more memory over time
https://bugs.launchpad.net/bugs/571093
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