gh-143057: avoid locking in `tracemalloc` C-APIs when it is not enabled (GH-143065)
(cherry picked from commit e728b006de)
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
gh-142873: Do not check for `PyContextVar_CheckExact` twice in `PyContextVar_Set` (GH-142874)
(cherry picked from commit e61a447d0e)
Co-authored-by: sobolevn <mail@sobolevn.me>
If there are many untracked tuples, the GC will run too often, resulting
in poor performance. The fix is to include untracked tuples in the
"long lived" object count. The number of frozen objects is also now
included since the free-threaded GC must scan those too.
(cherry picked from commit e38967ed60)
gh-142627: Ignore anonymous mappings in Linux remote debugging (GH-142628)
(cherry picked from commit e0bca091a4)
Co-authored-by: Victor Stinner <vstinner@python.org>
gh-137007: Track executor before any possible deallocations (GH-137016)
(cherry picked from commit 97e19014dd)
Co-authored-by: Ken Jin <kenjin@python.org>
gh-142048: Fix lost gc allocations count on thread cleanup (GH-142233)
(cherry picked from commit 49b1fb43f6)
Co-authored-by: Kevin Wang <kevmo314@gmail.com>
The GC for the free threaded build would get slower with each collection due
to effectively double counting objects freed by the GC.
(cherry picked from commit eb892868b3)
Co-authored-by: Kevin Wang <kevmo314@gmail.com>
GH-91636: Clear weakrefs created by finalizers. (GH-136401)
Weakrefs to unreachable garbage that are created during running of
finalizers need to be cleared. This avoids exposing objects that
have `tp_clear` called on them to Python-level code.
(cherry picked from commit b6b99bf7f1)
Co-authored-by: Neil Schemenauer <nas-github@arctrix.com>
gh-116008: Detect freed thread state in faulthandler (GH-141988)
Add _PyMem_IsULongFreed() function.
(cherry picked from commit d5d9e89dde)
Co-authored-by: Victor Stinner <vstinner@python.org>
* gh-125434: Display thread name in faulthandler on Windows (#140675)
(cherry picked from commit 313145eab5)
* gh-125434: Fix non-ASCII thread names in faulthandler on Windows (#140700)
Add _Py_DumpWideString() function to dump a wide string as ASCII. It
supports surrogate pairs.
Replace _Py_EncodeLocaleRaw() with _Py_DumpWideString()
in write_thread_name().
(cherry picked from commit 80f20f58b2)
Only raises if the stack pointer is both below the limit *and* above the stack base.
This prevents false positives for user-space threads, as the stack pointer will be outside those bounds
if the stack has been swapped.
Cherry-picked from commit c25a070759
Co-authored-by: Mark Shannon <mark@hotpy.org>
Co-authored-by: Rok Mandeljc <rok.mandeljc@gmail.com>
Co-authored-by: Mark Shannon <mark@hotpy.org>
Co-authored-by: Victor Stinner <vstinner@python.org>
* [3.14] GH-139914: Handle stack growth direction on HPPA (GH-140028)
Adapted from a patch for Python 3.14 submitted to the Debian BTS by John David Anglin https://bugs.debian.org/1105111#20
* Forgot to update test_call
* WTF typo
If we overflowed the global version counter (i.e., after 2*24 calls to
`_PyMonitoring_SetEvents`), we bailed out after setting global monitoring
events but before instrumenting code objects, which led to assertion errors
later on.
Also add a `time.sleep()` to `test_free_threading.test_monitoring` to avoid
overflowing the global version counter.
(cherry picked from commit e457d60daa)
Co-authored-by: Sam Gross <colesbury@gmail.com>
gh-140530: fix a reference leak in an error path for `raise exc from cause` (GH-140908)
Fix a reference leak in `raise E from T` when `T` is an exception
subtype for which `T.__new__` does not return an exception instance.
(cherry picked from commit 0c77e7c23b)
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Fix compiler warnings in remote debugging (#141060)
Example of fixed warnings on 32-bit Windows:
Python\remote_debugging.c(24,53): warning C4244: 'function':
conversion from 'uint64_t' to 'uintptr_t', possible loss of data
Modules\_remote_debugging_module.c(789,44): warning C4244:
'function': conversion from 'uint64_t' to 'size_t', possible loss
of data
(cherry picked from commit f458ac01ba)
gh-140513: Fail to compile if `_Py_TAIL_CALL_INTERP` is set but `preserve_none` and `musttail` do not exist. (GH-140548)
(cherry picked from commit 2f60b8f02f)
Co-authored-by: Krishna Chaitanya <141550576+XChaitanyaX@users.noreply.github.com>
gh-140815: Fix faulthandler for invalid/freed frame (GH-140921)
faulthandler now detects if a frame or a code object is invalid or
freed.
Add helper functions:
* _PyCode_SafeAddr2Line()
* _PyFrame_SafeGetCode()
* _PyFrame_SafeGetLasti()
_PyMem_IsPtrFreed() now detects pointers in [-0xff, 0xff] range
as freed.
(cherry picked from commit a84181c31b)
Co-authored-by: Victor Stinner <vstinner@python.org>
ast.parse() no longer emits syntax warnings for
return/break/continue in finally (see PEP-765) -- they are only
emitted during compilation.
(cherry picked from commit ad0a3f733b)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Ken Jin <kenjin@python.org>
Co-authored-by: devdanzin <74280297+devdanzin@users.noreply.github.com>
Co-authored-by: Chris Eibl <138194463+chris-eibl@users.noreply.github.com>
* Count number of actually tracked objects, instead of trackable objects. This ensures that untracking tuples has the desired effect of reducing GC overhead
* Do not track most untrackable tuples during creation. This prevents large numbers of small tuples causing execessive GCs.
* [3.14] gh-140067: Fix memory leak in sub-interpreter creation (GH-140111)
Fix memory leak in sub-interpreter creation caused by overwriting of the previously used `_malloced` field. Now the pointer is stored in the first word of the memory block to avoid it being overwritten accidentally.
(cherry picked from commit 59547a251f)
Co-authored-by: Shamil <ashm.tech@proton.me>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
gh-140257: fix data race on eval_breaker during finalization (GH-140265)
(cherry picked from commit c8729c9909)
Co-authored-by: Shamil <ashm.tech@proton.me>
The previous `Py_REFCNT(x) == 1` checks can have data races in the free
threaded build. `_PyObject_IsUniquelyReferenced(x)` is a more conservative
check that is safe in the free threaded build and is identical to
`Py_REFCNT(x) == 1` in the default GIL-enabled build.
(cherry picked from commit 32c264982e)
Co-authored-by: Sergey Miryanov <sergey.miryanov@gmail.com>
Revert GH-131993.
Fix swallowing some syntax warnings in different modules if they accidentally
have the same message and are emitted from the same line.
Fix duplicated warnings in the "finally" block.
(cherry picked from commit 279db6bede)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
* Update 2025-10-06-10-03-37.gh-issue-139640.gY5oTb.rst
---------
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
* [3.14] gh-139748: fix leaks in AC error paths when using unicode FS-based converters (GH-139765)
(cherry picked from commit b04a57deef)
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
gh-137440: Update comment in Python/hamt.c on importing for testing (GH-137441)
Switch from `_testcapi` to `_testinternalcapi`.
(cherry picked from commit 7ab68cd506)
Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>
