Another tailcall vm_interrupt bug#22265
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iluuu1994
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Jun 10, 2026
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Haven't spent too much time with the tailcall VM but the fix looks correct to me.
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| #define ZEND_VM_LOOP_INTERRUPT_CHECK() do { \ | ||
| if (UNEXPECTED(zend_atomic_bool_load_ex(&EG(vm_interrupt)))) { \ | ||
| SAVE_OPLINE(); \ |
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Is this probably only used in the HYBRID_DEFAULT branch. Though probably rather harmless in the other case.
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We fixed a bug in the tailcall VM related to vm_interrupt in 8.5.7: #21922. Unfortunately I was able to find another crash, reproducer attached.
Note that the "return opline" variant that Arnaud benchmarked passes this test. This PR instead adds a
SAVE_OPLINEbeforeZEND_VM_LOOP_INTERRUPTin a specific macro. They seemed very close in speed, and @bwoebi preferred this to partially reverting.