gh-151126: Fix missing `PyErr_NoMemory()` in `remove_unused_consts` by sobolevn · Pull Request #151127 · python/cpython

sobolevn · 2026-06-09T06:39:54Z

All supported versions down to 3.13 have this problem.

Issue: Many places have missing PyErr_NoMemory() call after failing memory allocation #151126

…sts`

encukou · 2026-06-09T08:38:51Z

@@ -0,0 +1 @@
+Add missing :c:func:`PyErr_NoMemory` call to ``Python/flowgraph.c`` module.


Nitpick: there's a role for that.

Suggested change

Add missing :c:func:`PyErr_NoMemory` call to ``Python/flowgraph.c`` module.

Add missing :c:func:`PyErr_NoMemory` call to :file:`Python/flowgraph.c` module.

No, I don't think this is an appropriate NEWS entry. Most of Python users know nothing about PyErr_NoMemory and Python/flowgraph.c, and should not. This is information only for core developers. We can write this in a commit message.

Please rewrite the NEWS entry in terms understandable for average Python user.

vstinner

LGTM. remove_unused_consts() is the only function of Python/flowgraph.c which allocates memory without calling PyErr_NoMemory() on error. The "end:" label frees memory correctly.

serhiy-storchaka

LGTM. 👍

sobolevn · 2026-06-09T09:57:21Z

Thanks everyone!

miss-islington-app · 2026-06-09T10:03:38Z

Thanks @sobolevn for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15.
🐍🍒⛏🤖

bedevere-app · 2026-06-09T10:03:52Z

GH-151134 is a backport of this pull request to the 3.15 branch.

bedevere-app · 2026-06-09T10:03:57Z

GH-151135 is a backport of this pull request to the 3.14 branch.

bedevere-app · 2026-06-09T10:04:03Z

GH-151136 is a backport of this pull request to the 3.13 branch.

…nsts` (GH-151127) (#151136) gh-151126: Fix missing `PyErr_NoMemory()` in `remove_unused_consts` (GH-151127) (cherry picked from commit 3186547) Co-authored-by: sobolevn <mail@sobolevn.me>

…nsts` (GH-151127) (#151134) gh-151126: Fix missing `PyErr_NoMemory()` in `remove_unused_consts` (GH-151127) (cherry picked from commit 3186547) Co-authored-by: sobolevn <mail@sobolevn.me>

…nsts` (GH-151127) (#151135) gh-151126: Fix missing `PyErr_NoMemory()` in `remove_unused_consts` (GH-151127) (cherry picked from commit 3186547) Co-authored-by: sobolevn <mail@sobolevn.me>

bedevere-bot · 2026-06-09T11:02:04Z

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/usr/bin/ld.bfd: cannot open output file Modules/pyexpat.cpython-314d-powerpc64le-linux-gnu.so: No space left on device
collect2: error: ld returned 1 exit status
make: *** [Makefile:3662: Modules/pyexpat.cpython-314d-powerpc64le-linux-gnu.so] Error 1
make: *** Waiting for unfinished jobs....
/usr/bin/ld.bfd: final link failed: No space left on device
collect2: error: ld returned 1 exit status
make: *** [Makefile:3642: Modules/zlib.cpython-314d-powerpc64le-linux-gnu.so] Error 1
Assembler messages:
Fatal error: can't create Modules/sha1module.o: No space left on device
make: *** [Makefile:3651: Modules/sha1module.o] Error 1
/usr/bin/ld.bfd: final link failed: No space left on device
collect2: error: ld returned 1 exit status
make: *** [Makefile:3640: Modules/_zstd.cpython-314d-powerpc64le-linux-gnu.so] Error 1
Assembler messages:
Fatal error: can't create Modules/sha3module.o: No space left on device
make: *** [Makefile:3655: Modules/sha3module.o] Error 1
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Fatal error: can't create Modules/sha2module.o: No space left on device
make: *** [Makefile:3653: Modules/sha2module.o] Error 1
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Fatal error: can't create Modules/blake2module.o: No space left on device
make: *** [Makefile:3657: Modules/blake2module.o] Error 1
/usr/bin/ld.bfd: final link failed: No space left on device
collect2: error: ld returned 1 exit status
make: *** [Makefile:3629: Modules/_decimal.cpython-314d-powerpc64le-linux-gnu.so] Error 1
Assembler messages:
Fatal error: can't create Modules/hmacmodule.o: No space left on device
make: *** [Makefile:3659: Modules/hmacmodule.o] Error 1
Assembler messages:
Fatal error: can't create Modules/_ctypes/_ctypes_test.o: No space left on device
make: *** [Makefile:3819: Modules/_ctypes/_ctypes_test.o] Error 1

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/usr/bin/ld.bfd: final link failed: No space left on device
clang: error: linker command failed with exit code 1 (use -v to see invocation)
/usr/bin/ld.bfd: final link failed: No space left on device
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Makefile:3594: Modules/_bisect.cpython-314d-powerpc64le-linux-gnu.so] Error 1
make: *** Waiting for unfinished jobs....
make: *** [Makefile:3590: Modules/array.cpython-314d-powerpc64le-linux-gnu.so] Error 1
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make: *** [Makefile:3311: Python/ceval.o] Error 1

bedevere-bot · 2026-06-09T11:19:10Z

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Previous HEAD position was 83e26a43a75 [3.15] gh-149321: Remove lazy_imports=none startup mode (GH-149389) (#150129)
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make: [Makefile:3017: libinstall] Error 1 (ignored)
install: error copying 'build/lib.linux-x86_64-3.15/build-details.json' to '/home/buildbot-worker/cstratak-fedora-stable-x86_64/3.15.cstratak-fedora-stable-x86_64.clang-installed/build/target/lib/python3.15/build-details.json': No space left on device
make: *** [Makefile:2614: install] Error 1

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find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
make[2]: [Makefile:3518: clean-retain-profile] Error 1 (ignored)
./Modules/socketmodule.c: In function ‘getsockaddrarg’:
./Modules/socketmodule.c:2638:9: warning: ‘strncpy’ specified bound 64 equals destination size [-Wstringop-truncation]
 2638 |         strncpy((char *)sa->salg_name, name, sizeof(sa->salg_name));
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ar: libpython3.15.a: error reading Parser/parser.o: No space left on device
make[2]: *** [Makefile:1196: libpython3.15.a] Error 1
make[1]: *** [Makefile:1028: profile-gen-stamp] Error 2
make: *** [Makefile:1040: profile-run-stamp] Error 2

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/usr/bin/ld.bfd: final link failed: No space left on device
collect2: error: ld returned 1 exit status
make: *** [Makefile:1973: Programs/_freeze_module] Error 1

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HEAD is now at 140af0fd1424 [3.13] gh-151126: Fix missing `PyErr_NoMemory()` in `remove_unused_consts` (GH-151127) (#151136)
Switched to and reset branch '3.13'

/tmp/cckuRHJj.s: Assembler messages:
/tmp/cckuRHJj.s: Fatal error: Modules/_sqlite/blob.o: No space left on device
/tmp/ccDZpoQR.s: make: *** [Makefile:3437: Modules/_sqlite/blob.o] Error 1
make: *** Waiting for unfinished jobs....
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/tmp/ccDZpoQR.s: Fatal error: Modules/_sqlite/prepare_protocol.o: No space left on device
make: *** [Makefile:3442: Modules/_sqlite/prepare_protocol.o] Error 1
/tmp/ccfNQDyq.s: Assembler messages:
/tmp/ccfNQDyq.s: Fatal error: can't write 3911 bytes to section .gnu.lto_.decls.b1d99a5439b17ebb of Modules/_sqlite/cursor.o: 'No space left on device'
/tmp/ccfNQDyq.s: Fatal error: Modules/_sqlite/cursor.o: No such file or directory
make: *** [Makefile:3439: Modules/_sqlite/cursor.o] Error 1
/tmp/ccWSriio.s: Assembler messages:
/tmp/ccWSriio.s: Fatal error: can't write 3911 bytes to section .gnu.debuglto_.debug_str of Modules/_ctypes/_ctypes.o: 'No space left on device'
/tmp/ccWSriio.s: Fatal error: Modules/_ctypes/_ctypes.o: No such file or directory
make: *** [Makefile:3427: Modules/_ctypes/_ctypes.o] Error 1
/tmp/ccmZn7Qo.s: Assembler messages:
/tmp/ccmZn7Qo.s: Fatal error: can't write 958 bytes to section .gnu.lto_PyTuple_GET_SIZE.6.baac69133e2fa053 of Modules/_sqlite/connection.o: 'No space left on device'
/tmp/ccmZn7Qo.s: Fatal error: Modules/_sqlite/connection.o: No such file or directory
make: *** [Makefile:3438: Modules/_sqlite/connection.o] Error 1
/tmp/cc6hYXDs.s: Assembler messages:
/tmp/cc6hYXDs.s: Fatal error: can't write 3911 bytes to section .gnu.debuglto_.debug_str of Modules/_cursesmodule.o: 'No space left on device'
/tmp/cc6hYXDs.s: Fatal error: Modules/_cursesmodule.o: No such file or directory
make: *** [Makefile:3433: Modules/_cursesmodule.o] Error 1
/tmp/cccmuDGE.s: Assembler messages:
/tmp/cccmuDGE.s: Fatal error: can't write 3912 bytes to section .gnu.debuglto_.debug_info of Modules/_ssl.o: 'No space left on device'
/tmp/cccmuDGE.s: Fatal error: Modules/_ssl.o: No such file or directory
make: *** [Makefile:3447: Modules/_ssl.o] Error 1

find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
make: [Makefile:3126: clean-retain-profile] Error 1 (ignored)

bedevere-bot · 2026-06-09T11:26:33Z

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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HEAD is now at 140af0fd1424 [3.13] gh-151126: Fix missing `PyErr_NoMemory()` in `remove_unused_consts` (GH-151127) (#151136)
Switched to and reset branch '3.13'

rror: unable to open output file 'Objects/unicodeobject.o': 'No space left on device'
1 error generated.
rror: unable to open output file 'Python/dtoa.o': 'No space left on device'
1 error generated.
make: *** [Makefile:3036: Objects/unicodeobject.o] Error 1
make: *** Waiting for unfinished jobs....
make: *** [Makefile:3043: Python/dtoa.o] Error 1
rror: unable to open output file 'Modules/_suggestions.o': 'No space left on device'
1 error generated.
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make: *** [Makefile:3560: Modules/_io/_iomodule.o] Error 1
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rror: unable to open output file 'Modules/_collectionsmodule.o': 'No space left on device'
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make: *** [Makefile:3556: Modules/_collectionsmodule.o] Error 1
rror: unable to open output file 'Modules/posixmodule.o': 'No space left on device'
1 error generated.
make: *** [Makefile:3546: Modules/posixmodule.o] Error 1
rror: unable to open output file 'Python/ceval.o': 'No space left on device'
1 error generated.
make: *** [Makefile:3036: Python/ceval.o] Error 1

find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
find: ‘build’: No such file or directory
make: [Makefile:3126: clean-retain-profile] Error 1 (ignored)

vstinner · 2026-06-09T11:47:05Z

"AMD64 Fedora Stable" buildbot worker disk was full. I fixed the issue (I removed all buildbot build directories).

pythongh-151126: Fix missing PyErr_NoMemory() in `remove_unused_con…

23b35a5

…sts`

sobolevn requested a review from vstinner June 9, 2026 06:39

sobolevn requested review from iritkatriel and markshannon as code owners June 9, 2026 06:39

sobolevn added skip news needs backport to 3.13 bugs and security fixes needs backport to 3.14 bugs and security fixes needs backport to 3.15 pre-release feature fixes, bugs and security fixes labels Jun 9, 2026

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bedevere-app Bot mentioned this pull request Jun 9, 2026

Many places have missing PyErr_NoMemory() call after failing memory allocation #151126

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Comment thread Python/flowgraph.c

sobolevn added 2 commits June 9, 2026 10:25

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Fix NEWS wording

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sobolevn merged commit 3186547 into python:main Jun 9, 2026
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bedevere-app Bot removed the needs backport to 3.13 bugs and security fixes label Jun 9, 2026

		@@ -0,0 +1 @@
		Add missing :c:func:`PyErr_NoMemory` call to ``Python/flowgraph.c`` module.

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sobolevn commented Jun 9, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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sobolevn commented Jun 9, 2026

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bedevere-bot commented Jun 9, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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bedevere-bot commented Jun 9, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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bedevere-bot commented Jun 9, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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bedevere-bot commented Jun 9, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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bedevere-bot commented Jun 9, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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bedevere-bot commented Jun 9, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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bedevere-bot commented Jun 9, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

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vstinner commented Jun 9, 2026

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sobolevn commented Jun 9, 2026 •

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