Re: [PATCH v2 1/3] iotests: run the test pool with the 'fork' start method

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Jul 15, 2026 at 12:34:49PM +0200, Denis V. Lunev wrote:
> run_tests_pool() shares the runner via the class attribute
> TestRunner.shared_self, relying on worker processes to inherit it.
> That only works with the 'fork' start method. Python 3.14 switched
> the Linux default to 'forkserver', so workers see shared_self as
> None and parallel runs abort with:
> 
>   assert runner is not None
>   AssertionError
> 
> Only reproduces with Python 3.14+ and 'check -jN' (N > 1); meson
> runs one test per process and never calls run_tests_pool(), so CI
> is unaffected.
> 
> Request get_context('fork') explicitly; it is available on all
> supported Python versions and a no-op before 3.14.
> 
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> CC: Kevin Wolf <kwolf@redhat.com>
> CC: Hanna Reitz <hreitz@redhat.com>
> ---
>  tests/qemu-iotests/testrunner.py | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


With regards,
Daniel
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