[BUG] RecursionError when attempting to capture a traceback from an error (Rich v14.0.0)
- [x] I've checked docs and closed issues for possible solutions.
- [x] I can't find my issue in the FAQ.
Describe the bug
After updating to Rich v14.0.0 I get a RecursionError when attempting to capture a traceback from an error.
Here's my function along with the helper function to create the traceback:
def eval_error(
exception: BaseException,
exc_type: Type[Any],
exc_value: BaseException,
exc_traceback: TracebackType | None,
) -> EvalError:
# create ansi traceback
with open(os.devnull, "w") as f:
console = Console(record=True, file=f, legacy_windows=True)
console.print(rich_traceback(exc_type, exc_value, exc_traceback))
traceback_ansi = console.export_text(styles=True)
# return error
return EvalError(
message=exception_message(exception),
traceback=traceback_text,
traceback_ansi=traceback_ansi,
)
def rich_traceback(
exc_type: Type[Any], exc_value: BaseException, exc_traceback: TracebackType | None
) -> RenderableType:
rich_tb = Traceback.from_exception(
exc_type=exc_type,
exc_value=exc_value,
traceback=exc_traceback,
suppress=[click, asyncio, tenacity, sys.modules[PKG_NAME]],
show_locals=False,
width=CONSOLE_DISPLAY_WIDTH,
)
return rich_tb
Here's the stack trace for the RecursionError:
|
| Traceback (most recent call last):
| File "/home/parallels/UKGovernmentBEIS/inspect_ai/src/inspect_ai/_eval/run.py", line 280, in run_task
| result = await task_run(tasks[index])
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/home/parallels/UKGovernmentBEIS/inspect_ai/src/inspect_ai/_eval/task/run.py", line 389, in task_run
| error = eval_error(ex, type, value, traceback)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/home/parallels/UKGovernmentBEIS/inspect_ai/src/inspect_ai/log/_log.py", line 649, in eval_error
| console.print(rich_traceback(exc_type, exc_value, exc_traceback))
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/home/parallels/UKGovernmentBEIS/inspect_ai/src/inspect_ai/log/_log.py", line 665, in rich_traceback
| rich_tb = Traceback.from_exception(
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| File "/home/parallels/UKGovernmentBEIS/inspect_ai/.venv/lib/python3.12/site-packages/rich/traceback.py", line 381, in from_exception
| rich_traceback = cls.extract(
| ^^^^^^^^^^^^
| File "/home/parallels/UKGovernmentBEIS/inspect_ai/.venv/lib/python3.12/site-packages/rich/traceback.py", line 466, in extract
| Traceback.extract(
| File "/home/parallels/UKGovernmentBEIS/inspect_ai/.venv/lib/python3.12/site-packages/rich/traceback.py", line 466, in extract
| Traceback.extract(
| File "/home/parallels/UKGovernmentBEIS/inspect_ai/.venv/lib/python3.12/site-packages/rich/traceback.py", line 466, in extract
| Traceback.extract(
| [Previous line repeated 2950 more times]
| File "/home/parallels/UKGovernmentBEIS/inspect_ai/.venv/lib/python3.12/site-packages/rich/traceback.py", line 491, in extract
| iter_locals: Iterable[Tuple[str, object]],
| ~~~~~~~~^^^^^^^^^^^^^^^^^^^^
| File "/usr/lib/python3.12/typing.py", line 395, in inner
| return _caches[func](*args, **kwds)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| RecursionError: maximum recursion depth exceeded
Platform
What platform (Win/Linux/Mac) are you running on? What terminal software are you using?
Running on Linux, running in the VS Code integrated terminal
I may ask you to copy and paste the output of the following commands. It may save some time if you do it now.
If you're using Rich in a terminal:
python -m rich.diagnose
pip freeze | grep rich
╭─────────────────────── <class 'rich.console.Console'> ───────────────────────╮
│ A high level console interface. │
│ │
│ ╭──────────────────────────────────────────────────────────────────────────╮ │
│ │ <console width=80 ColorSystem.TRUECOLOR> │ │
│ ╰──────────────────────────────────────────────────────────────────────────╯ │
│ │
│ color_system = 'truecolor' │
│ encoding = 'utf-8' │
│ file = <_io.TextIOWrapper name='<stdout>' mode='w' │
│ encoding='utf-8'> │
│ height = 20 │
│ is_alt_screen = False │
│ is_dumb_terminal = False │
│ is_interactive = True │
│ is_jupyter = False │
│ is_terminal = True │
│ legacy_windows = False │
│ no_color = False │
│ options = ConsoleOptions( │
│ size=ConsoleDimensions(width=80, height=20), │
│ legacy_windows=False, │
│ min_width=1, │
│ max_width=80, │
│ is_terminal=True, │
│ encoding='utf-8', │
│ max_height=20, │
│ justify=None, │
│ overflow=None, │
│ no_wrap=False, │
│ highlight=None, │
│ markup=None, │
│ height=None │
│ ) │
│ quiet = False │
│ record = False │
│ safe_box = True │
│ size = ConsoleDimensions(width=80, height=20) │
│ soft_wrap = False │
│ stderr = False │
│ style = None │
│ tab_size = 8 │
│ width = 80 │
╰──────────────────────────────────────────────────────────────────────────────╯
╭─── <class 'rich._windows.WindowsConsoleFeatures'> ────╮
│ Windows features available. │
│ │
│ ╭───────────────────────────────────────────────────╮ │
│ │ WindowsConsoleFeatures(vt=False, truecolor=False) │ │
│ ╰───────────────────────────────────────────────────╯ │
│ │
│ truecolor = False │
│ vt = False │
╰───────────────────────────────────────────────────────╯
╭────── Environment Variables ───────╮
│ { │
│ 'CLICOLOR': None, │
│ 'COLORTERM': 'truecolor', │
│ 'COLUMNS': None, │
│ 'JPY_PARENT_PID': None, │
│ 'JUPYTER_COLUMNS': None, │
│ 'JUPYTER_LINES': None, │
│ 'LINES': None, │
│ 'NO_COLOR': None, │
│ 'TERM_PROGRAM': 'vscode', │
│ 'TERM': 'xterm-256color', │
│ 'TTY_COMPATIBLE': None, │
│ 'VSCODE_VERBOSE_LOGGING': None │
│ } │
╰────────────────────────────────────╯
platform="Linux"
rich==14.0.0
Thank you for your issue. Give us a little time to review it.
PS. You might want to check the FAQ if you haven't done so already.
This is an automated reply, generated by FAQtory
I will need an MRE from you, if you would like me to look in to this.
Okay, will do! It appears to have something to do with Python 3.11's ExceptionGroup (as it doesn't occur in Python 3.10 where we import ExceptionGroup from the exceptiongroup backport package).
I've reproduced this is a very specific context, which I'm having trouble isolating the cause of. The key symptom involves the continue block at https://github.com/Textualize/rich/blob/8c4d3d1d50047e3aaa4140d0ffc1e0c9f1df5af4/rich/traceback.py#L575-L580
When the bug this occurs, extract() recursively re-invokes itself on the same ExceptionGroup, where the ExceptionGroup contains an arbitrary other Exception within it. exc_value.__context__ of the Exception refers back to the original ExceptionGroup, creating a cycle. This seems to occur under very specific async conditions. Opening it in the debugger shows it's just calling extract, going through the rest of the function normally until it hits that continue, then looping back to the top of the while block and recursive calling Extract on the same ExceptionGroup again.
Apologies I can't provide a minimal example yet - I've tried for hours to reproduce this in isolation without success. However, it consistently reproduces in our production stack, which uses uvicorn.serve running in asyncio, and starlette with and a custom middleware that injects a few headers.
Summary: the stop condition in extract seems insufficient, and can't account for cases where the context of an Exception is the ExceptionGroup containing it (per exc_value.__context__ at line 574). This happens in ASGI situations where an unhandled exception in a task group bubbles up and is reported from call_exception_handler in asyncio.base_events.
EDIT: stripped a few more lines out, verified it also occurs with using asyncio taskgroups directly. This is all spawning from "unhandled error in taskgroup" so it's likely specific to how taskgroups form ExceptionGroups
Update - managed to strip it down to a shareable example, it's still dependent on several external dependencies, so I'm going to see if I can capture it a bit better elsewhere.
Dependencies:
- fastapi 0.115.12
- anyio 4.9.0
- starlette 0.46.2
- Python 3.12
import anyio
import logging.config
import uvicorn
import fastapi
from starlette.middleware.base import BaseHTTPMiddleware
logger = logging.getLogger(__name__)
app = fastapi.FastAPI()
@app.get("/api/v1/foo")
async def root():
raise Exception("original exception")
async def run():
async with anyio.create_task_group() as tg:
app.add_middleware(BaseHTTPMiddleware)
server = uvicorn.Server(uvicorn.Config(app, host="0.0.0.0", port=12345, log_config=None, log_level=None))
tg.start_soon(server.serve)
def main():
anyio.run(run, backend="asyncio")
if __name__ == "__main__":
# Configure logging with RichHandler
logging.config.dictConfig({
"version": 1,
"disable_existing_loggers": False,
"handlers": {
"console": {
"class": "rich.logging.RichHandler",
"level": "INFO",
"rich_tracebacks": True,
}
},
"root": {"handlers": ["console"], "level": "INFO"},
"incremental": False,
})
main()
Then, reach the API with curl (you can use httpx and call it from within the task group but I didn't want to add more confusion)
$ curl -H "BAZ: qux" localhost:12345/api/v1/foo
Running this will cause the issue - it'll log
[05/21/25 16:55:29] INFO Started server process [1521717] server.py:83
INFO Waiting for application startup. on.py:48
INFO Application startup complete. on.py:62
INFO Uvicorn running on http://0.0.0.0:12345 (Press CTRL+C to quit) server.py:215
[05/21/25 16:55:41] INFO 127.0.0.1:54526 - "GET /api/v1/foo HTTP/1.1" 500
before it hangs for a moment and then another error about maximum recursion depth blows up the console.
The middleware is necessary, removing it causes it to just log an error as normal. If using a debugger, placing it in Traceback.extract() will show the loop - it's failing when being handed Exception("original exception"), which has no cause but has __context__ set to ExceptionGroup('unhandled errors in a TaskGroup', [Exception('original exception')]).
For convenience, here's a version that calls the api for you and therefore requires no further input to trigger the error
import anyio
import logging.config
import uvicorn
import fastapi
import httpx
from starlette.middleware.base import BaseHTTPMiddleware
logger = logging.getLogger(__name__)
app = fastapi.FastAPI()
@app.get("/api/v1/foo")
async def root():
raise Exception("original exception")
async def call_api():
await anyio.sleep(2) # wait for the server to start
async with httpx.AsyncClient() as client:
await client.get("http://localhost:12345/api/v1/foo")
async def run():
async with anyio.create_task_group() as tg:
app.add_middleware(BaseHTTPMiddleware)
server = uvicorn.Server(uvicorn.Config(app, host="0.0.0.0", port=12345, log_config=None, log_level=None))
tg.start_soon(server.serve)
tg.start_soon(call_api)
def main():
anyio.run(run, backend="asyncio")
if __name__ == "__main__":
# Configure logging with RichHandler
logging.config.dictConfig({
"version": 1,
"disable_existing_loggers": False,
"handlers": {
"console": {
"class": "rich.logging.RichHandler",
"level": "INFO",
"rich_tracebacks": True,
}
},
"root": {"handlers": ["console"], "level": "INFO"},
"incremental": False,
})
main()
randomly pausing hanging app in debugger we see this trace:
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extract, traceback.py:466
from_exception, traceback.py:381
emit, logging.py:144
Thanks for trying. But for future reference an MRE really needs to be more minimal, which means no dependancies.