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GeezerVison is showing github.com — [3.14] gh-144763: Fix race conditions in tracemalloc (#144779) by vstinner · Pull Request #144965 · python/cpython

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@vstinner

@vstinner vstinner commented Feb 18, 2026 •
edited by bedevere-app Bot
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Avoid PyUnstable_InterpreterFrame_GetLine() since it uses a critical section which can lead to a deadlock.

_PyTraceMalloc_Stop() now also calls PyRefTracer_SetTracer() without holding TABLES_LOCK() to prevent another deadlock.

(cherry picked from commit 83f4fff)

  • Issue: Crash in _io_TextIOWrapper_write_impl when running tracemalloc.clear_traces in threads #144763

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@vstinner @kumaraditya303
pythongh-144763: Fix race conditions in tracemalloc (python#144779)
de4f844 
Avoid PyUnstable_InterpreterFrame_GetLine() since it uses a critical
section which can lead to a deadlock.

_PyTraceMalloc_Stop() now also calls PyRefTracer_SetTracer() without
holding TABLES_LOCK() to prevent another deadlock.

Co-authored-by: Kumar Aditya <[email protected]>
(cherry picked from commit 83f4fff)
@vstinner vstinner added the skip news label Feb 18, 2026
@bedevere-app bedevere-app Bot added the awaiting core review label Feb 18, 2026
@vstinner vstinner mentioned this pull request Feb 18, 2026
gh-144763: Don't detach the GIL in tracemalloc #144779
Merged
@bedevere-app bedevere-app Bot mentioned this pull request Feb 18, 2026
Crash in _io_TextIOWrapper_write_impl when running tracemalloc.clear_traces in threads #144763
Closed
@vstinner
vstinner merged commit f67cf83 into python:3.14 Feb 18, 2026
84 of 86 checks passed

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@bedevere-app bedevere-app Bot removed the awaiting core review label Feb 18, 2026
@vstinner
vstinner deleted the tracemalloc_dont_detach14 branch February 18, 2026 19:55
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@vstinner
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