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The REPL hangs under no memory on 3.13 #134163

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The REPL hangs under no memory on 3.13#134163
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3.13only security fixesstdlibStandard Library Python modules in the Lib/ directorytopic-replRelated to the interactive shelltype-bugAn unexpected behavior, bug, or error

Description

@ZeroIntensity
ZeroIntensity
opened on May 17, 2025

Bug report

Bug description:

In the new REPL, failing allocations seem to cause the prompt to get stuck:

>>> import _testcapi
>>> _testcapi.set_nomemory(0)  # Now wait forever

I don't expect it to be able to work under no memory, but I do expect it to at least crash gracefully. The basic REPL spits this out before exiting:

object address  : 0x7f02f532d180
object refcount : 3
object type     : 0x7f02f5ec7780
object type name: MemoryError
object repr     : 
lost sys.stderr

Ideally, the new REPL should do something similar. This isn't at all a priority, but something fun for anyone bored and willing to take a stab at it.

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Linked PRs

Activity

  1. ZeroIntensity
    added
    type-bugAn unexpected behavior, bug, or error
    3.13only security fixes
    3.14bugs and security fixes
    topic-replRelated to the interactive shell
    3.15bugs and security fixes
    on May 17, 2025
  2. picnixz
    added
    stdlibStandard Library Python modules in the Lib/ directory
    on May 17, 2025

  3. sergey-miryanov commented on May 18, 2025

    @sergey-miryanov
    sergey-miryanov
    on May 18, 2025
    Contributor

    On windows 11 it works as expected (virtual terminal support on)

     [2025-05-18 15:21:11] [D:\Sources\_pythonish\cpython\main]  [main ≡ +17 ~10 -0 !] [󰅒 1:56.656]
➜ .\python.bat
Running Release|x64 interpreter...
Python 3.15.0a0 (heads/main-dirty:0a160bf14c4, May 18 2025, 15:19:49) [MSC v.1943 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import _testcapi
>>> _testcapi.set_nomemory(0)
object address  : 00000269B229DF00
object refcount : 3
object type     : 00007FF8887AFDF0
object type name: MemoryError
object repr     :
lost sys.stderr

  4. donbarbos commented on May 18, 2025

    @donbarbos
    donbarbos
    on May 18, 2025
    Contributor

    On windows 11 it works as expected (virtual terminal support on)

    I also didn't get any hangs either using ./configure --with-pydebug && make on Linux (I tested on gcc and clang):

    >>> _testcapi.set_nomemory(0)
object address  : 0x79d5e61a42f0
object refcount : 3
object type     : 0x591fb1b34f40
object type name: MemoryError
object repr     :
lost sys.stderr

  5. ZeroIntensity commented on May 18, 2025

    @ZeroIntensity
    ZeroIntensity
    on May 18, 2025
    MemberAuthor

    Ah, I screwed up when testing. 3.14 and 3.15 do exhibit the correct behavior, but not 3.13. My bad!

  6. ZeroIntensity
    removed
    3.14bugs and security fixes
    3.15bugs and security fixes
    on May 18, 2025
  7. ZeroIntensity
    changed the title [-]The REPL hangs under no memory[/-] [+]The REPL hangs under no memory on 3.13[/+] on May 18, 2025
  8. ZeroIntensity
    added a commit that references this issue on Sep 10, 2025

    [3.13] gh-134163: Fix an infinite loop when the process runs out of m…

    afec6a5

  9. ZeroIntensity commented on Sep 10, 2025

    @ZeroIntensity
    ZeroIntensity
    on Sep 10, 2025
    MemberAuthor

    Thanks @yihong0618 for the fix!

  10. ZeroIntensity
    closed this as completedon Sep 10, 2025
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