Re: [RFC PATCH v2 1/4] rseq: Add sched_state field to struct rseq

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* Dmitry Vyukov:

> In reality it's a bit more involved since the field is actually 8
> bytes and only partially overlaps with rseq.cpu_id_start (it's an
> 8-byte pointer with high 4 bytes overlap rseq.cpu_id_start):

This does not compose with other rseq users, as noted in the sources:

  // Note: this makes __rseq_abi.cpu_id_start unusable for its original purpose.

For a core library such a malloc replacement, that is a very bad trap.


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