Threads from _log_start_if_long might not be reaped
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Description
@benSepanski showed me a long with zillions of them live at one point.
Here's what that log looked like:
```
Thread 0x00007f6535c23700 (most recent call first):
File "/home/bensepan/firedrake/lib/python3.9/site-packages/pytools/__init__.py", line 2424 in _log_start_if_long
File "/usr/lib/python3.9/threading.py", line 892 in run
File "/usr/lib/python3.9/threading.py", line 954 in _bootstrap_inner
File "/usr/lib/python3.9/threading.py", line 912 in _bootstrap
Thread 0x00007f6331ffb700 (most recent call first):
File "/home/bensepan/firedrake/lib/python3.9/site-packages/pytools/__init__.py", line 2424 in _log_start_if_long
File "/usr/lib/python3.9/threading.py", line 892 in run
File "/usr/lib/python3.9/threading.py", line 954 in _bootstrap_inner
File "/usr/lib/python3.9/threading.py", line 912 in _bootstrap
Thread 0x00007f63327fc700 (most recent call first):
File "/home/bensepan/firedrake/lib/python3.9/site-packages/pytools/__init__.py", line 2424 in _log_start_if_long
File "/usr/lib/python3.9/threading.py", line 892 in run
File "/usr/lib/python3.9/threading.py", line 954 in _bootstrap_inner
File "/usr/lib/python3.9/threading.py", line 912 in _bootstrap
Thread 0x00007f6332ffd700 (most recent call first):
File "/home/bensepan/firedrake/lib/python3.9/site-packages/pytools/__init__.py", line 2424 in _log_start_if_long
File "/usr/lib/python3.9/threading.py", line 892 in run
File "/usr/lib/python3.9/threading.py", line 954 in _bootstrap_inner
File "/usr/lib/python3.9/threading.py", line 912 in _bootstrap
Thread 0x00007f63337fe700 (most recent call first):
File "/home/bensepan/firedrake/lib/python3.9/site-packages/pytools/__init__.py", line 2424 in _log_start_if_long
File "/usr/lib/python3.9/threading.py", line 892 in run
File "/usr/lib/python3.9/threading.py", line 954 in _bootstrap_inner
File "/usr/lib/python3.9/threading.py", line 912 in _bootstrap
Thread 0x00007f6537426700 (most recent call first):
File "/home/bensepan/firedrake/lib/python3.9/site-packages/pytools/__init__.py", line 2424 in _log_start_if_long
File "/usr/lib/python3.9/threading.py", line 892 in run
File "/usr/lib/python3.9/threading.py", line 954 in _bootstrap_inner
File "/usr/lib/python3.9/threading.py", line 912 in _bootstrap
```
(on a presumably unrelated crash in PETSc/Cython)
Contributor guide
No contributing guide indexed for this repository
Research direction
Start in pytools/__init__.py at _log_start_if_long, the function shown in every reported thread, and inspect how those threads are created and stopped. Reproduce the long-running logging scenario if possible, then verify that completed logging threads no longer accumulate; the unrelated PETSc/Cython crash may help provide a reproduction context.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100