test_capi.test_watchers fails with "env changed" on "wasm32-emscripten node": Warning -- Unraisable exception

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Bug report

Checklist

• I am confident this is a bug in CPython, not a bug in a third-party project
• I have searched the CPython issue tracker,
  and am confident this bug has not been reported before

CPython versions tested on:

CPython main branch

Operating systems tested on:

Other

Output from running 'python -VV' on the command line:

No response

A clear and concise description of the bug:

Recent build: https://buildbot.python.org/all/#/builders/1050/builds/2826

Dictionary watcher tests using catch_unraisable_exception context manager fails on the "wasm32-emscripten node (pthreads) 3.x" buildbot: the exception was logged too late, after catch_unraisable_exception block.

Example of error:

test_dealloc_watcher_raises_error (test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error) ... Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function loop at 0x19e62a0>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123

Full logs:

Details

test_dealloc_watcher_raises_error (test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error) ... Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function loop at 0x19e62a0>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function nop at 0x17c5218>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function long_loop at 0x1628518>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function  at 0x19edb78>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x16431a0>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x19d4b50>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x17944b8>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x1860cf8>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x1860c80>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x185fec8>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x18960c0>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x194f980>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x18ee1b8>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x19240b8>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x168ff60>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x16c3df0>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x19d7f80>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x19fbce0>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x1986a38>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x19ed358>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x1983750>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x18d00a0>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x197cfe0>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x189bb00>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function TestPendingCalls.PendingTask.run_in_pending_call.<locals>.callback at 0x18529e8>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function WeakSet.__init__.<locals>._remove at 0x17015a0>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function many_vars at 0x189d770>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function  at 0x18d1bd8>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function  at 0x18159b8>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function  at 0x1696620>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
Warning -- Unraisable exception
Exception ignored in: 'PyFunction_EVENT_DESTROY watcher callback for <function  at 0x1872448>'
Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_capi/test_watchers.py", line 532, in watcher
    raise MyError("testing 123")
test.test_capi.test_watchers.TestFuncWatchers.test_dealloc_watcher_raises_error.<locals>.MyError: testing 123
ok

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cc @brandtbucher @iritkatriel @brettcannon

[brettcannon]

/cc @hoodmane

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I didn't see this warning recently. If it occurs, a buildbot build should be marked as WARNINGS (orange). I close the issue.