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 <[email protected]>
> CC: Kevin Wolf <[email protected]>
> CC: Hanna Reitz <[email protected]>
> ---
> tests/qemu-iotests/testrunner.py | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
Reviewed-by: Daniel P. Berrangé <[email protected]>
With regards,
Daniel
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