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Re: [Xen-devel] [PATCH 0/2] libxl: fix handling of fd and timer registrations

On Mon, Feb 02, 2015 at 05:00:34PM -0700, Jim Fehlig wrote:
> This small series fixes some assertions we occasionally see in the
> libxl driver when running libvirt-TCK.  The assertions were due to
> races between destroying per-domain libxl_ctx and receiving fd and
> timer callbacks associated with them.  The races are masked by
> setting DEBUG loglevel in libvirtd.conf, so often missed by
> automated test setups that want DEBUG loglevel.
> Patch 1 actually fixes the assertions.  Patch2 fixes a stupid mistake.
> See the commit messages for details.
> Jim Fehlig (2):
>   libxl: fix fd and timer event handling
>   libxl: Move setup of child processing code to driver initialization
>  src/libxl/libxl_domain.c | 244 
> +----------------------------------------------
>  src/libxl/libxl_driver.c | 212 +++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 212 insertions(+), 244 deletions(-)

Hi Jim,

I gave a try to those two patches with OpenStack. Assuming I haven't make any
mistake, it make things worse.

  Ubuntu 14.04
  with Xen package install (xen 4.4)
  libvirt: master (47dd6c4)
  Installed OpenStack via DevStack

Test: ./run_tempest.sh tempest.api.compute

without the patches, the tests run fine, they all succeed.
with the patches, the tests fail AND libvirt became unresponsible.
  Running `virsh -c xen: list` does not return. (or any virsh command)

I have attach a backtrace, if that can help.

Anthony PERARD

Attachment: libvirt-bt.log
Description: Text document

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