Detect single trace inversions and correct them.

Trace inversion happens when:

* thread A calls malloc, starts a trace record, and then is
  suspended by the kernel.

* thread B calls free, writes a trace record, and frees address X.

* thread A is scheduled, and returns address X.

The trace would show thread A's malloc returning pointer X before
thread B free's it, which is "trace inversion".

This patch detects a single inversion (multiple inversions can happen,
although rare) and reschedules the malloc to happen right after the
free.

0 files changed, 0 insertions, 0 deletions