[Tile-serving] [openstreetmap/osm2pgsql] free(): invalid size (#773)

[Paul Norman]

When using 8581a01340d7761c1b5b1d7a305b9dd9a0f04da5 and `osm2pgsql --number-processes 4 -d ct  --output multi --style cleartables.json ~/osm/planet/vancouver_canada.osm.pbf` I get the error

```
Going over pending ways...
        152357 ways are pending

Using 4 helper-processes
*** Error in `/home/pnorman/osm/osm2pgsql/build/osm2pgsql': free(): invalid size: 0x00007fe9940026d0 ***
*** Error in `/home/pnorman/osm/osm2pgsql/build/osm2pgsql': double free or corruption (fasttop): 0x00007fe99c014560 ***
...
```

Other error messages spotted are
```
*** Error in `/home/pnorman/osm/osm2pgsql/build/osm2pgsql': corrupted size vs. prev_size: 0x00007f5714002fb0 ***
```

It seems to happen most of the time, if not always. It didn't happen with --number-processes 1

Backtraces from GDB quite long, so I'm going to see if I can use other tools to pin down the error

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