[Tile-serving] [osm2pgsql] Hang on unsimplified diffs (#112)

[Paul Norman]

This is reproducible, but takes a full planet import...

1. Import a full planet with `osm2pgsql -d gis -c -S default.style --flat-nodes flat.nodes -C 20000 --slim --number-processes 4 planet-130904.osm.pbf`

2. Cluster on a geohash index (probably optional)

3. Import hourly diffs with 

  ```sh
  for n in `seq 555 568`;
      do osm2pgsql -d gis -a -S default.style --flat-nodes flat.nodes -C 2000 --slim --number-processes 8 "diffs/008/$n.osc.gz"
  done
  ```

On diff 568 osm2pgsql will hang. `pg_stat_activity` will show a COPY statement running for hours, consuming 100% CPU, no disk IO, and that process will not end if osm2pgsql is terminated or of `pg_terminate_backend(pid)` is used.

This may be because it wasn't passed through osmosis with `--simc`, but the hung process is still wrong

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/112
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