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Victor Stinner authored
Issue #26588: Fix _tracemalloc start/stop: don't play with the reentrant flag. set_reentrant(1) fails with an assertion error if tracemalloc_init() is called first in a thread A and tracemalloc_start() is called second in a thread B. The tracemalloc is imported in a thread A. Importing the module calls tracemalloc_init(). tracemalloc.start() is called in a thread B.
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