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Re: [libvirt] [PATCH] Bug Fix: Do not release network actual device in qemuBuildCommandLine on error

On 11/16/2011 09:34 PM, Roopa Prabhu wrote:
From: Roopa Prabhu<roprabhu cisco com>

For direct attach devices, in qemuBuildCommandLine, we seem to be freeing
actual device on error path (with networkReleaseActualDevice). But the actual
device is not deleted.

qemuProcessStop eventually deletes the direct attach device and releases actual device. But by the time qemuProcessStop is called qemuBuildCommandLine
has already freed actual device. Leaving stray macvtap devices behind on error.
So the simplest fix is to remove the networkReleaseActualDevice in
qemuBuildCommandLine. This patch does just that.

Does this look right ?. I have only verified this with direct and bridge mode.
You're right and to me your patch looks ok too. When using the interface type=network and then network in 'macvtap direction connection' mode [1] and an error happens in qemuBuildCommandLine I also see a stray macvtap device left behind. We're calling networkReleaseActualDevice two times and that seems to not work in this configuration. In the case when macvtap is used via interface type='direct' it works fine with or without your patch.

[1] file:///root/tmp/libvirt-acl/docs/formatnetwork.html#examplesDirect

The other option is to do both delMacvtap and networkReleaseActualDevice in
qemuBuildCommandLine instead of doing only networkReleaseActualDevice.
I do have a patch for this too.

Signed-off-by: Roopa Prabhu<roprabhu cisco com>
  src/qemu/qemu_command.c |    2 --
  1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index bb12016..ba33a4a 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -5378,8 +5378,6 @@ qemuBuildCommandLine(virConnectPtr conn,
      /* free up any resources in the network driver */
-    for (i = 0 ; i<  def->nnets ; i++)
-        networkReleaseActualDevice(def->nets[i]);
      for (i = 0; i<= last_good_net; i++)

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