hard20 pts · first answer countslinuxmemoryoom

malloc succeeded, then OOM kill

A program's malloc of 20 GB succeeds on a 16 GB box, but the process is OOM-killed later while filling the buffer. Why did malloc not fail?

A.malloc always reserves swap first, then RAMB.The kernel moved the buffer to another NUMA nodeC.Linux overcommits; memory is only taken when pages are touchedD.malloc returns a fake pointer when memory is short

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malloc succeeded, then OOM kill

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