Fix the insecure comparison function

[footka]

Task Description

The sort comparator called fast_check_status() to detect PX interrupts. Once an interrupt was triggered, the comparator returned false for all subsequent comparisons instead of performing the actual comparison. This broke the strict weak ordering required by std::sort, causing undefined behavior. Specifically, __unguarded_linear_insert underflowed the iterator and dereferenced a garbage pointer, leading to a memory_sanity_abort().

Solution Description

The fix ensures the comparator maintains strict weak ordering even when an interrupt is detected. The logic was adjusted so that the interrupt status is checked, but the comparator still returns a valid, deterministic boolean result based on the actual data comparison to satisfy the ordering requirements of the sorting algorithm.

Passed Regressions

Upgrade Compatibility

Other Information

Release Note