JsiiErrors / EAGAIN when using node>=13.2 with Python, Java & .NET

When deploying, some file is temporarily unavailable.

Reproduction Steps

from aws_cdk import (
    core
)

class Stack(core.Stack):
    def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
        super().__init__(scope, id, **kwargs)

app = core.App()
stack = Stack(app, "Test")

app.synth()

Then deploy

$ cdk deploy --app "python stack.py"

Error Log

$ cdk deploy --app "python stack.py"
internal/fs/utils.js:220
    throw err;
    ^

Error: EAGAIN: resource temporarily unavailable, read
    at Object.readSync (fs.js:516:3)
    at SyncStdio.readLine (/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/jsii/_embedded/jsii/jsii-runtime.js:13322:25)
    at InputOutput.read (/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/jsii/_embedded/jsii/jsii-runtime.js:13272:34)
    at KernelHost.run (/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/jsii/_embedded/jsii/jsii-runtime.js:7228:32)
    at Immediate.<anonymous> (/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/jsii/_embedded/jsii/jsii-runtime.js:7236:37)
    at processImmediate (internal/timers.js:439:21) {
  errno: -11,
  syscall: 'read',
  code: 'EAGAIN'
}
Traceback (most recent call last):
  File "stack_bugreport.py", line 1, in <module>
    from aws_cdk import (
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/aws_cdk/aws_apigateway/__init__.py", line 548, in <module>
    import aws_cdk.aws_certificatemanager
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/aws_cdk/aws_certificatemanager/__init__.py", line 104, in <module>
    import aws_cdk.aws_cloudformation
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/aws_cdk/aws_cloudformation/__init__.py", line 125, in <module>
    import aws_cdk.aws_iam
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/aws_cdk/aws_iam/__init__.py", line 169, in <module>
    import aws_cdk.region_info
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/aws_cdk/region_info/__init__.py", line 113, in <module>
    __jsii_assembly__ = jsii.JSIIAssembly.load("@aws-cdk/region-info", "1.18.0", __name__, "[e-mail]")
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/jsii/_runtime.py", line 40, in load
    _kernel.load(assembly.name, assembly.version, os.fspath(assembly_path))
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/jsii/_kernel/__init__.py", line 209, in load
    self.provider.load(LoadRequest(name=name, version=version, tarball=tarball))
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/jsii/_kernel/providers/process.py", line 330, in load
    return self._process.send(request, LoadResponse)
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/jsii/_kernel/providers/process.py", line 310, in send
    self._next_message(), _ProcessResponse_R
  File "/home/drluke/work/di-client-api-message-dispatcher/venv/lib/python3.7/site-packages/jsii/_kernel/providers/process.py", line 261, in _next_message
    return json.loads(self._process.stdout.readline(), object_hook=ohook)
  File "/usr/lib/python3.7/json/__init__.py", line 361, in loads
    return cls(**kw).decode(s)
  File "/usr/lib/python3.7/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.7/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
Subprocess exited with error 1

Workaround for the time being

Downgrade node to version 12.13.1

Environment

• CLI Version : 1.18.0 (build bc924bc)
• Framework Version: 1.18.0
• OS : Linux
• Language : Python

---

This is 🐛 Bug Report

[pd5rm]

FYI, nodejs v13.1.0 works as well, but 13.2.0 fails.

[RomainMuller]

Okay - so we have a smoking gun - it appears that there is a behavior change in node 13.2 that causes the symptoms. We have to investigate deeper to understand whether node 13.2 reveals a latent bug in our code, or whether we should report a bug to them.