Prevent dtor of generator in suspended fiber #10462
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Generators that suspended a fiber should not be dtor because they will be executed during the fiber dtor. Fiber dtor throws an exception in the fiber's context in order to unwind and execute finally blocks, which will also properly dtor the generator.
bwoebi
previously approved these changes
Jan 27, 2023
trowski
approved these changes
Jan 27, 2023
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Fixes #9916
The shutdown sequence calls the destructor of any live generator or fiber (or any object).
When a fiber is suspended in a generator, the fiber destructor will resume the execution the generator, which may be already be destroyed. This leads to the issues described in #9916.
Because of this, we must not attempt to destroy a generator that was executing in a suspended fiber.
The fiber destructor conveniently throws a zend_ce_graceful_exit in the fiber context, which will also properly terminate the generator (and execute its finally blocks). I believe that this has the same semantics as the generator destructor.