RFR: 8256732: Zero: broken +ZeroTLAB exposes badly initialized memory

Mon Nov 23 08:23:02 UTC 2020

On Sun, 22 Nov 2020 23:03:57 GMT, David Holmes <dholmes at openjdk.org> wrote:

> But isn't the memory returned by ThreadLocalAllocBuffer::allocate implicitly already zeroed when ZeroTLAB is specified?

No! That tripped me too! The comment at `ThreadLocalAllocBuffer::allocate` actually says: `// Allocate size HeapWords. The memory is NOT initialized to zero.`

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PR: https://git.openjdk.java.net/jdk/pull/1343