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fix(tests): explicit yield in test_create_ssl_server_manual_connection_lost - #743
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This was referenced Apr 25, 2026
samypr100
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April 28, 2026 16:22
fantix
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Apr 28, 2026
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Changes ======= * Add Python 3.15 and 3.15t wheel builds and CI coverage (MagicStack#758) (by @honglei @fantix in f7c0547) * Add support for the `eager_start` keyword argument in create_task() (MagicStack#748) (by @samypr100 in 3cbb095 for MagicStack#746 MagicStack#718) * Add thread name prefix to the default thread pool executor (MagicStack#636) (by @inikolaev @fantix in 0582f94 for MagicStack#562) * Add support for special hostname `<broadcast>` (MagicStack#592) (by @jpbede in 3060ceb for MagicStack#540) * Upgrade libuv to v1.52.1 (MagicStack#753) (by @fantix in e8efea4 for MagicStack#752) * Improve performance by using Python C API to enter/exit context (MagicStack#627) (by @tarasko in 837ef22) * Improve performance/latency of Transport.write (MagicStack#619) (by @tarasko in 1d9b6e0) * Replace some SSL vectorcall with direct methods (MagicStack#626) (by @tarasko in 6a27cbe) * Optimize SSL buffered reads using C values (MagicStack#629) (by @tarasko in a308f75) Fixes ===== * Detach socket on create_connection cancellation to prevent fd double-close (MagicStack#740) (by @junjzhang @fantix in dc680eb for MagicStack#645 MagicStack#738) * Remove `loop._ready_len` in favor of `len(loop._ready)` (MagicStack#721) (by @x42005e1f in 5910a18 for MagicStack#720) * Prefer inspect.iscoroutinefunction (MagicStack#705) (by @MatthieuDartiailh in fd65027 for MagicStack#703) * Fix context tests by explicitly yielding after run_in_executor (MagicStack#743) (by @samypr100 in 6cd24cb) * Fix test_create_connection_open_con_addr with Python 3.13.9+ (MagicStack#713) (by @shadchin in b93141a for MagicStack#701) * Skip flaky test_cancel_post_init on asyncio 3.13+ (MagicStack#714) (by @fantix in 3ea5c85 for MagicStack#709) * Fix flaky test_fs_event (MagicStack#717) (by @fantix in 8da4547) * Use C __atomic builtins for debug counters (MagicStack#719) (by @fantix in 836e3b2) * Update the example to work with Python 3.14 (MagicStack#710) (by @Jamie-Chang in b74c2f1) Build ===== * Replace pkg_resources with packaging and use Cython 3.1 (MagicStack#742) (by @samypr100 in b377b7c for MagicStack#729) * Remove wheel as a build dependency (MagicStack#696) (by @DimitriPapadopoulos in 173e88c) * Support any number of flags in UVLOOP_OPT_CFLAGS (MagicStack#630) (by @mgorny in 963a5f3)
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This PR fixes
test_context.test_create_ssl_server_manual_connection_lostflakiness that became very apparent when usingPYTHONASYNCIODEBUG=1after Python 3.13.12 and 3.14.3. Previous versions are unaffected because they don't contain the patch introduced by python/cpython#141696 although it may still rarely flake on older versions.After python/cpython#141696
loop.run_in_executor(..., ssl_sock.send)now often resolves without yielding to the event loop whenPYTHONASYNCIODEBUG=1is set. When no yielding happens the SSL incoming buffer never gets the sent data while_app_reading_pausedwas set to true.Looking at the test and context when it was introduced in #348, I believe there was an implicit assumption that
run_in_executorwould yield in this test so that it would go through the expected internal path ofepoll_pwait->buffer_updated_implbefore schedulingcloseflushing process andresume_readingsetting_app_reading_pausedto false.Disclosure: This PR is made by human-only contribution without AI generated code.
Note this PR will remain in draft as it relies on #742 to show success of the CI.