Quadratic traceback-growth in TaskGroup nesting-level on asyncio backend #863
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…ns/codecov-cli with 2 updates (#581) Bumps the python-dependencies group in /.github/actions/codecov-cli with 2 updates: [codecov-cli](https://github.com/codecov/codecov-cli) and [anyio](https://github.com/agronholm/anyio). Updates `codecov-cli` from 10.2.0 to 10.3.0 <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/codecov/codecov-cli/releases">codecov-cli's releases</a>.</em></p> <blockquote> <h2>Release v10.3.0</h2> <p>Autogenerated for v10.3.0. Created for <a href="https://redirect.github.com/codecov/codecov-cli/pull/666">codecov/codecov-cli#666</a></p> <h2>What's Changed</h2> <ul> <li>Release 10.2.0 by <a href="https://github.com/codecov-releaser"><code>@codecov-releaser</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/652">codecov/codecov-cli#652</a></li> <li>Add create commit to <code>empty-upload</code> command by <a href="https://github.com/michelletran-codecov"><code>@michelletran-codecov</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/654">codecov/codecov-cli#654</a></li> <li>Release 10.2.1 by <a href="https://github.com/codecov-releaser"><code>@codecov-releaser</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/655">codecov/codecov-cli#655</a></li> <li>Pin requirements.txt to use test-results-parser==0.5.4 by <a href="https://github.com/michelletran-codecov"><code>@michelletran-codecov</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/656">codecov/codecov-cli#656</a></li> <li>Revert "Release 10.2.1" by <a href="https://github.com/michelletran-codecov"><code>@michelletran-codecov</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/657">codecov/codecov-cli#657</a></li> <li>Release 10.2.1 by <a href="https://github.com/codecov-releaser"><code>@codecov-releaser</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/658">codecov/codecov-cli#658</a></li> <li>Hide and mark ATS-related commands as deprecated by <a href="https://github.com/Swatinem"><code>@Swatinem</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/662">codecov/codecov-cli#662</a></li> <li>fix: add list_relevant_files to NoVersioningSystem by <a href="https://github.com/thomasrockhu-codecov"><code>@thomasrockhu-codecov</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/665">codecov/codecov-cli#665</a></li> </ul> <p><strong>Full Changelog</strong>: <a href="https://github.com/codecov/codecov-cli/compare/v10.2.0...v10.3.0">https://github.com/codecov/codecov-cli/compare/v10.2.0...v10.3.0</a></p> <h2>Release v10.2.1</h2> <p>Autogenerated for v10.2.1. Created for <a href="https://redirect.github.com/codecov/codecov-cli/pull/658">codecov/codecov-cli#658</a></p> <h2>What's Changed</h2> <ul> <li>Release 10.1.1 by <a href="https://github.com/codecov-releaser"><code>@codecov-releaser</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/645">codecov/codecov-cli#645</a></li> <li>add --toc-recurse-submodules argument by <a href="https://github.com/matt-codecov"><code>@matt-codecov</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/650">codecov/codecov-cli#650</a></li> <li>Release 10.2.0 by <a href="https://github.com/codecov-releaser"><code>@codecov-releaser</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/652">codecov/codecov-cli#652</a></li> <li>Add create commit to <code>empty-upload</code> command by <a href="https://github.com/michelletran-codecov"><code>@michelletran-codecov</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/654">codecov/codecov-cli#654</a></li> <li>Release 10.2.1 by <a href="https://github.com/codecov-releaser"><code>@codecov-releaser</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/655">codecov/codecov-cli#655</a></li> <li>Pin requirements.txt to use test-results-parser==0.5.4 by <a href="https://github.com/michelletran-codecov"><code>@michelletran-codecov</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/656">codecov/codecov-cli#656</a></li> <li>Revert "Release 10.2.1" by <a href="https://github.com/michelletran-codecov"><code>@michelletran-codecov</code></a> in <a href="https://redirect.github.com/codecov/codecov-cli/pull/657">codecov/codecov-cli#657</a></li> </ul> <p><strong>Full Changelog</strong>: <a href="https://github.com/codecov/codecov-cli/compare/v10.1.1...v10.2.1">https://github.com/codecov/codecov-cli/compare/v10.1.1...v10.2.1</a></p> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/codecov/codecov-cli/commit/97e90fa9fff4ab9d4f39217b320f5375bf754aba"><code>97e90fa</code></a> Prepare release 10.3.0</li> <li><a href="https://github.com/codecov/codecov-cli/commit/f2b75b3183b4bd1e203f415e5e16b82cc5e62bb9"><code>f2b75b3</code></a> fix: add list_relevant_files to NoVersioningSystem (<a href="https://redirect.github.com/codecov/codecov-cli/issues/665">#665</a>)</li> <li><a href="https://github.com/codecov/codecov-cli/commit/6533a8c9d8b9f336aaaef8919459bdf5013ed852"><code>6533a8c</code></a> Hide and mark ATS-related commands as deprecated (<a href="https://redirect.github.com/codecov/codecov-cli/issues/662">#662</a>)</li> <li><a href="https://github.com/codecov/codecov-cli/commit/8364881cde4cd111bc2caca137a97e57f3ef1543"><code>8364881</code></a> Prepare release 10.2.1 (<a href="https://redirect.github.com/codecov/codecov-cli/issues/658">#658</a>)</li> <li><a href="https://github.com/codecov/codecov-cli/commit/29a7964f9b47541a79e6ec5dee97eb81b73c7cf7"><code>29a7964</code></a> Revert "Prepare release 10.2.1 (<a href="https://redirect.github.com/codecov/codecov-cli/issues/655">#655</a>)" (<a href="https://redirect.github.com/codecov/codecov-cli/issues/657">#657</a>)</li> <li><a href="https://github.com/codecov/codecov-cli/commit/852ad85e9ef0f2f613ac9bdf2a5825e79786af4a"><code>852ad85</code></a> Pin requirements.txt to use test-results-parser==0.5.4 (<a href="https://redirect.github.com/codecov/codecov-cli/issues/656">#656</a>)</li> <li><a href="https://github.com/codecov/codecov-cli/commit/aed3a0473e7bc9b5b62d1753e59de0cab0a9c9ec"><code>aed3a04</code></a> Prepare release 10.2.1 (<a href="https://redirect.github.com/codecov/codecov-cli/issues/655">#655</a>)</li> <li><a href="https://github.com/codecov/codecov-cli/commit/30cba3fd3b047bb4c1f2295201568ca458a74cc4"><code>30cba3f</code></a> Add create commit to <code>empty-upload</code> command (<a href="https://redirect.github.com/codecov/codecov-cli/issues/654">#654</a>)</li> <li><a href="https://github.com/codecov/codecov-cli/commit/079f01ba314c9ed0fdf7f5ef0699fe17be9c250f"><code>079f01b</code></a> Prepare release 10.2.0 (<a href="https://redirect.github.com/codecov/codecov-cli/issues/652">#652</a>)</li> <li>See full diff in <a href="https://github.com/codecov/codecov-cli/compare/v10.2.0...v10.3.0">compare view</a></li> </ul> </details> <br /> Updates `anyio` from 4.8.0 to 4.9.0 <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/agronholm/anyio/releases">anyio's releases</a>.</em></p> <blockquote> <h2>4.9.0</h2> <ul> <li>Added async support for temporary file handling (<a href="https://redirect.github.com/agronholm/anyio/issues/344">#344</a>; PR by <a href="https://github.com/11kkw"><code>@11kkw</code></a>)</li> <li>Added 4 new fixtures for the AnyIO <code>pytest</code> plugin: <ul> <li><code>free_tcp_port_factory</code>: session scoped fixture returning a callable that generates unused TCP port numbers</li> <li><code>free_udp_port_factory</code>: session scoped fixture returning a callable that generates unused UDP port numbers</li> <li><code>free_tcp_port</code>: function scoped fixture that invokes the <code>free_tcp_port_factory</code> fixture to generate a free TCP port number</li> <li><code>free_udp_port</code>: function scoped fixture that invokes the <code>free_udp_port_factory</code> fixture to generate a free UDP port number</li> </ul> </li> <li>Added <code>stdin</code> argument to <code>anyio.run_process()</code> akin to what <code>anyio.open_process()</code>, <code>asyncio.create_subprocess()</code>, <code>trio.run_process()</code>, and <code>subprocess.run()</code> already accept (PR by <a href="https://github.com/jmehnle"><code>@jmehnle</code></a>)</li> <li>Added the <code>info</code> property to <code>anyio.Path</code> on Python 3.14</li> <li>Changed <code>anyio.getaddrinfo()</code> to ignore (invalid) IPv6 name resolution results when IPv6 support is disabled in Python</li> <li>Changed <code>EndOfStream</code> raised from <code>MemoryObjectReceiveStream.receive()</code> to leave out the <code>AttributeError</code> from the exception chain which was merely an implementation detail and caused some confusion</li> <li>Fixed traceback formatting growing quadratically with level of <code>TaskGroup</code> nesting on asyncio due to exception chaining when raising <code>ExceptionGroups</code> in <code>TaskGroup.__aexit__</code> (<a href="https://redirect.github.com/agronholm/anyio/issues/863">#863</a>; PR by <a href="https://github.com/tapetersen"><code>@tapetersen</code></a>)</li> <li>Fixed <code>anyio.Path.iterdir()</code> making a blocking call in Python 3.13 (<a href="https://redirect.github.com/agronholm/anyio/issues/873">#873</a>; PR by <a href="https://github.com/cbornet"><code>@cbornet</code></a> and <a href="https://github.com/agronholm"><code>@agronholm</code></a>)</li> <li>Fixed <code>connect_tcp()</code> producing cyclic references in tracebacks when raising exceptions (<a href="https://redirect.github.com/agronholm/anyio/pull/809">#809</a>; PR by <a href="https://github.com/graingert"><code>@graingert</code></a>)</li> <li>Fixed <code>anyio.to_thread.run_sync()</code> needlessly holding on to references of the context, function, arguments and others until the next work item on asyncio (PR by <a href="https://github.com/Wankupi"><code>@Wankupi</code></a>)</li> </ul> </blockquote> </details> <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/agronholm/anyio/blob/master/docs/versionhistory.rst">anyio's changelog</a>.</em></p> <blockquote> <h1>Version history</h1> <p>This library adheres to <code>Semantic Versioning 2.0 <http://semver.org/></code>_.</p> <p><strong>4.9.0</strong></p> <ul> <li> <p>Added async support for temporary file handling (<code>[#344](agronholm/anyio#344) <https://github.com/agronholm/anyio/issues/344></code>_; PR by <a href="https://github.com/11kkw"><code>@11kkw</code></a>)</p> </li> <li> <p>Added 4 new fixtures for the AnyIO <code>pytest</code> plugin:</p> <ul> <li><code>free_tcp_port_factory</code>: session scoped fixture returning a callable that generates unused TCP port numbers</li> <li><code>free_udp_port_factory</code>: session scoped fixture returning a callable that generates unused UDP port numbers</li> <li><code>free_tcp_port</code>: function scoped fixture that invokes the <code>free_tcp_port_factory</code> fixture to generate a free TCP port number</li> <li><code>free_udp_port</code>: function scoped fixture that invokes the <code>free_udp_port_factory</code> fixture to generate a free UDP port number</li> </ul> </li> <li> <p>Added <code>stdin</code> argument to <code>anyio.run_process()</code> akin to what <code>anyio.open_process()</code>, <code>asyncio.create_subprocess_…()</code>, <code>trio.run_process()</code>, and <code>subprocess.run()</code> already accept (PR by <a href="https://github.com/jmehnle"><code>@jmehnle</code></a>)</p> </li> <li> <p>Added the <code>info</code> property to <code>anyio.Path</code> on Python 3.14</p> </li> <li> <p>Changed <code>anyio.getaddrinfo()</code> to ignore (invalid) IPv6 name resolution results when IPv6 support is disabled in Python</p> </li> <li> <p>Changed <code>EndOfStream</code> raised from <code>MemoryObjectReceiveStream.receive()</code> to leave out the <code>AttributeError</code> from the exception chain which was merely an implementation detail and caused some confusion</p> </li> <li> <p>Fixed traceback formatting growing quadratically with level of <code>TaskGroup</code> nesting on asyncio due to exception chaining when raising <code>ExceptionGroups</code> in <code>TaskGroup.__aexit__</code> (<code>[#863](agronholm/anyio#863) <https://github.com/agronholm/anyio/issues/863></code>_; PR by <a href="https://github.com/tapetersen"><code>@tapetersen</code></a>)</p> </li> <li> <p>Fixed <code>anyio.Path.iterdir()</code> making a blocking call in Python 3.13 (<code>[#873](agronholm/anyio#873) <https://github.com/agronholm/anyio/issues/873></code>_; PR by <a href="https://github.com/cbornet"><code>@cbornet</code></a> and <a href="https://github.com/agronholm"><code>@agronholm</code></a>)</p> </li> <li> <p>Fixed <code>connect_tcp()</code> producing cyclic references in tracebacks when raising exceptions (<code>[#809](agronholm/anyio#809) <https://github.com/agronholm/anyio/pull/809></code>_; PR by <a href="https://github.com/graingert"><code>@graingert</code></a>)</p> </li> <li> <p>Fixed <code>anyio.to_thread.run_sync()</code> needlessly holding on to references of the context, function, arguments and others until the next work item on asyncio (PR by <a href="https://github.com/Wankupi"><code>@Wankupi</code></a>)</p> </li> </ul> <p><strong>4.8.0</strong></p> <ul> <li>Added <strong>experimental</strong> support for running functions in subinterpreters on Python 3.13 and later</li> <li>Added support for the <code>copy()</code>, <code>copy_into()</code>, <code>move()</code> and <code>move_into()</code> methods in <code>anyio.Path</code>, available in Python 3.14</li> <li>Changed <code>TaskGroup</code> on asyncio to always spawn tasks non-eagerly, even if using a task factory created via <code>asyncio.create_eager_task_factory()</code>, to preserve expected Trio-like task scheduling semantics (PR by <a href="https://github.com/agronholm"><code>@agronholm</code></a> and <a href="https://github.com/graingert"><code>@graingert</code></a>)</li> </ul> <!-- raw HTML omitted --> </blockquote> <p>... (truncated)</p> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/agronholm/anyio/commit/a6e9ebb75f0e1492ab5d0740b2ca76d0137f95e3"><code>a6e9ebb</code></a> Bumped up the version</li> <li><a href="https://github.com/agronholm/anyio/commit/9b9520d9ab3b00c0438073278830eddb64ff7875"><code>9b9520d</code></a> Fixed cyclic references in to_thread.run_sync() on asyncio (<a href="https://redirect.github.com/agronholm/anyio/issues/887">#887</a>)</li> <li><a href="https://github.com/agronholm/anyio/commit/1f04d6b1582f21bc199417ffcd46f78defbc0ec9"><code>1f04d6b</code></a> Added a note about asyncio cancellation semantics</li> <li><a href="https://github.com/agronholm/anyio/commit/e14b17208982aaa90158038a66eb0696fe7bd548"><code>e14b172</code></a> Upgraded to a newer Sphinx version</li> <li><a href="https://github.com/agronholm/anyio/commit/7e13c49b34e908980a1198e9b05f43677dab833a"><code>7e13c49</code></a> Avoid refcycles in tracebacks from happy eyeballs exceptions (<a href="https://redirect.github.com/agronholm/anyio/issues/809">#809</a>)</li> <li><a href="https://github.com/agronholm/anyio/commit/d134da712b884efc19894966421894da4dab1c86"><code>d134da7</code></a> Raise EndOfStream from None in MemoryObjectReceiveStream.receive() (<a href="https://redirect.github.com/agronholm/anyio/issues/889">#889</a>)</li> <li><a href="https://github.com/agronholm/anyio/commit/2840e06384d22f35935874043a753d04b0fad70c"><code>2840e06</code></a> Added cheaper implementation for no_other_refs() on Python 3.14 (<a href="https://redirect.github.com/agronholm/anyio/issues/886">#886</a>)</li> <li><a href="https://github.com/agronholm/anyio/commit/31ce0a5d7532b9148570194c2a934741bbed2cad"><code>31ce0a5</code></a> Added fixtures for generating bindable TCP/UDP ports (<a href="https://redirect.github.com/agronholm/anyio/issues/856">#856</a>)</li> <li><a href="https://github.com/agronholm/anyio/commit/cd85e47338a32e6eb813998c4b1c8dbf0b9f722b"><code>cd85e47</code></a> Test on PyPy 3.11 on CI (<a href="https://redirect.github.com/agronholm/anyio/issues/876">#876</a>)</li> <li><a href="https://github.com/agronholm/anyio/commit/d228020e6ea3f3b0bb8eab3a75eb1df31389eddf"><code>d228020</code></a> Detect blocking calls in coroutines using BlockBuster (<a href="https://redirect.github.com/agronholm/anyio/issues/875">#875</a>)</li> <li>Additional commits viewable in <a href="https://github.com/agronholm/anyio/compare/4.8.0...4.9.0">compare view</a></li> </ul> </details> <br /> Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot merge` will merge this PR after your CI passes on it - `@dependabot squash and merge` will squash and merge this PR after your CI passes on it - `@dependabot cancel merge` will cancel a previously requested merge and block automerging - `@dependabot reopen` will reopen this PR if it is closed - `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually - `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore <dependency name> major version` will close this group update PR and stop Dependabot creating any more for the specific dependency's major version (unless you unignore this specific dependency's major version or upgrade to it yourself) - `@dependabot ignore <dependency name> minor version` will close this group update PR and stop Dependabot creating any more for the specific dependency's minor version (unless you unignore this specific dependency's minor version or upgrade to it yourself) - `@dependabot ignore <dependency name>` will close this group update PR and stop Dependabot creating any more for the specific dependency (unless you unignore this specific dependency or upgrade to it yourself) - `@dependabot unignore <dependency name>` will remove all of the ignore conditions of the specified dependency - `@dependabot unignore <dependency name> <ignore condition>` will remove the ignore condition of the specified dependency and ignore conditions </details> Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
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Things to check first
I have searched the existing issues and didn't find my bug already reported there
I have checked that my bug is still present in the latest release
AnyIO version
4.8.0
Python version
3.11
What happened?
Since python implicitly adds a context linking the current Exception to the new one when raising while exiting a context manager due to an unhandled Exception and task groups always wrap errors in their own
BaseExceptionGroupthe resulting traceback grows quadratically with the level of nested task groups due to the "During handling of the above..."This seems to be straightforward to fix by simply explicitly raising from None in
anyio/src/anyio/_backends/_asyncio.py
Lines 767 to 769 in 897d69a
It looks like we already have added the exception to the group so breaking the context should be ok without loss of information.
How can we reproduce the bug?
Simple example with 5 levels
Results in
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