The faulthandler module is invaluable for tracking down segfaults in native
code, however it is really lacking the ability to add some kind of useful
breadcumb to aide debugging. Imagine you are running a large-scale distributed
job over tens of millions of images and a single one causes opencv to segfault
reliably. This can be very difficult to track down.
It would be very useful to be able to add a string (limited by size) via the
faulthandler module that is outputted along with the traceback. For example:
```
for image in millions_of_images():
faulthandler.context(f'{image.id=}')
segfaulty_function(image)
# Or maybe:
for image in millions_of_images():
with faulthandler.context(f'{image.id=}'):
segfaulty_function(image)
```
The traceback might be something like:
```
Fatal Python error: Segmentation fault
Current thread 0x00007fb899f39700 (most recent call first):
.... (traceback)
Segmentation fault
Context: image_id=foo
```
You could of course add logging to this function to print out the image ID
before you run it through `segfaulty_function`, but if you're running this at
high volume on a huge number of machines, this becomes a bit of an overhead,
and it doesn't handle multiple threads running the function well.
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