Re: [PATCH] tests/functional: fix race in virtio balloon test

[Thomas Huth <thuth@redhat.com>]

On 04/03/2025 19.33, Daniel P. Berrangé wrote:
> There are two race conditions in the recently added virtio balloon
> test
> 
>   * The /dev/vda device node is not ready
>   * The virtio-balloon driver has not issued the first stats refresh
> 
> To fix the former, monitor dmesg for a line about 'vda'.
> 
> To fix the latter, retry the stats query until seeing fresh data.
> 
> Adding 'quiet' to the kernel command line reduces serial output
> which otherwise slows boot, making it less likely to hit the former
> race too.
> 
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
>   tests/functional/test_virtio_balloon.py | 24 +++++++++++++++++++-----
>   1 file changed, 19 insertions(+), 5 deletions(-)

Reviewed-by: Thomas Huth <thuth@redhat.com>