Building core18 base fails : segfault/exit 139

[Andreas Steffan]

Hallo everybody,

I am trying to build microk8s based on core18.

My host is cosmic and I am using the docker variant of the build:

```
docker run --rm -v "$PWD":/build -w /build snapcore/snapcraft bash \
      -c "apt update && snapcraft"
```
The only change I applied was adding a line `base: core18` to `snapcraft.yaml` on master. The build works fine using unmodified sources.

With the change applied, I end up:

```
Preparing to pull libnftnl
Running on 'xenial'
Pulling libnftnl
snapcraft is running as a snap False, SNAP_NAME set to ''
Segmentation fault (core dumped)
Traceback (most recent call last):
  File "/usr/bin/snapcraft", line 9, in <module>
    load_entry_point('snapcraft==2.43.1', 'console_scripts', 'snapcraft')()
  File "/usr/lib/python3/dist-packages/click/core.py", line 716, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 696, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1037, in invoke
    return Command.invoke(self, ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 889, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python3/dist-packages/click/core.py", line 534, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/lib/python3/dist-packages/snapcraft/cli/_runner.py", line 93, in run
    ctx.forward(lifecyclecli.commands["snap"])
  File "/usr/lib/python3/dist-packages/click/core.py", line 552, in forward
    return self.invoke(cmd, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 534, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/snapcraft/cli/lifecycle.py", line 136, in snap
    project = _execute(steps.PRIME, parts=[], **kwargs)
  File "/usr/lib/python3/dist-packages/snapcraft/cli/lifecycle.py", line 35, in _execute
    lifecycle.execute(step, project_config, parts)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 90, in execute
    executor.run(step, part_names)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 194, in run
    self._handle_step(part_names, part, step, current_step, cli_config)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 208, in _handle_step
    getattr(self, "_run_{}".format(current_step.name))(part)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 250, in _run_pull
    self._run_step(step=steps.PULL, part=part, progress="Pulling")
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 327, in _run_step
    getattr(part, step.name)()
  File "/usr/lib/python3/dist-packages/snapcraft/internal/pluginhandler/__init__.py", line 415, in pull
    self._runner.pull()
  File "/usr/lib/python3/dist-packages/snapcraft/internal/pluginhandler/_runner.py", line 83, in pull
    "override-pull", self._override_pull_scriptlet, self._sourcedir
  File "/usr/lib/python3/dist-packages/snapcraft/internal/pluginhandler/_runner.py", line 176, in _run_scriptlet
    scriptlet_name=scriptlet_name, code=status
snapcraft.internal.errors.ScriptletRunError: Failed to run 'override-pull': Exit code was 139.
```

PS: I am very new to snapcraft so please forgive me in case I am missing something.

Thanks
Andreas

[Sergio Schvezov (sergiusens)]

Docker is an advanced mode, we can certainly warn about this situation, but by stating core18 on a docker image that is not based out of bionic you are mixing libc ABI and causing this crash you see here.