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Does it also happen if you remove the qix (or rebuild it)?

Yes,
it happen also if removing the .qix.

I dont know how to rebuild it (the qix).

I tried "new_shapefile_crashing" and could check for validity using the python console. The toolbox geometry validity tool did not crash either (qgis 2.14). The shape has 32 self-intersections, one line with less than two points, and 3 duplicate nodes.

The real issue seems to be "invalid geometries are not displayed when zoomed in more than their extend", thus making it impossible to repair them. The crash might be another issue.

Are you say-ing that qgis dont display an invalid geometry when it is invalid ?

I dont know this

Maximilian Krambach wrote:

I tried "new_shapefile_crashing" and could check for validity using the python console. The toolbox geometry validity tool did not crash either (qgis 2.14). The shape has 32 self-intersections, one line with less than two points, and 3 duplicate nodes.

The real issue seems to be "invalid geometries are not displayed when zoomed in more than their extend", thus making it impossible to repair them. The crash might be another issue.

When testing with other invalid lines (self intersection, lines with 0 or 1 points), they don't disappear. So I'm unsure now what causes the line to disappear. However, your data give a "Exception: IllegalArgumentException: point array must contain 0 or >1 elements" message in the GEOS log. Maybe this will help someone to find the cause.

To repair your data, you can use the "v.clean" (grass) tool. They wil be multiple lines again, but your work won't be lost.

Thx for your feedback.
I really appreaciate the time you lost try-ing to be of help for us.

Unfortunatelly we was not able to start the grass from inside our qgis installation.
I'm really embarrassed to be unable to try the solution you (with your time) give us due to another annoying issue in our installations of qgis.
(sometimes qgis is really irritating)

So I cannot verify your solution using Grass tools v.clean.

So we try to resolve the invalidities using other solutions.

A.

Maximilian Krambach wrote:

When testing with other invalid lines (self intersection, lines with 0 or 1 points), they don't disappear. So I'm unsure now what causes the line to disappear. However, your data give a "Exception: IllegalArgumentException: point array must contain 0 or >1 elements" message in the GEOS log. Maybe this will help someone to find the cause.

To repair your data, you can use the "v.clean" (grass) tool. They wil be multiple lines again, but your work won't be lost.

I investigated it further.
The culprit in the shapefile is a (somehow valid) line with a length of < 1e-10 m. The multipart geometry apparently cannot handle this level of detail difference. The shapefile is okay, just the display is off. To "repair" the shapefile, run "multipart to singlepart", then find the offending feature id, delete this feature and proceed with "singlepart to multipart" again.
To find the feature id, you can run a small code snippet on the python console (extensions- python console):

layer = iface.activeLayer()
for feature in layer.getFeatures():
    if feature.geometry().length() < 0.0000000001: 
        print feature.id()

sorry for asking asking again, what is the status of this issue? Has the reporter made more tests?