Fix swapped CAS arguments breaking the one-time-init guard - #247
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lalithsharan-intel
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Sep 8, 2026
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On non-Windows platforms
__itt_interlocked_compare_exchangepassedexchangeas oldval andcomperandas newval to__sync_val_compare_and_swap, which takes (ptr, oldval, newval) - the reverse ofInterlockedCompareExchange.The compare never matched, so every thread won the
ITT_MUTEX_INIT_AND_LOCKrace and re-ran__itt_mutex_init()on an already-locked mutex (UB; aborts with a glibc assertion), andITT_MUTEX_DESTROYnever fired.Fixes #245