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test_zipfile64.[...].test_strip_removed_large_file_with_dd_no_sig fails on BigMem runs #152190

Description

@StanFromIreland

Bug report

Bug description:

For example, in this run:

======================================================================
FAIL: test_strip_removed_large_file_with_dd_no_sig (test.test_zipfile64.TestRepack.test_strip_removed_large_file_with_dd_no_sig)
Should scan for the data descriptor (without signature) of a removed
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.diegorusso-aarch64-bigmem.bigmem/build/Lib/test/test_zipfile64.py", line 214, in test_strip_removed_large_file_with_dd_no_sig
    self.assertLess(peak, self.allowed_memory)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 603662 not less than 204800
----------------------------------------------------------------------

I'm also able to reproduce this locally:

$ ./python -m test test_zipfile64 -u extralargefile -v -m test_strip_removed_large_file_with_dd_no_sig
== CPython 3.16.0a0 (heads/main:f7e5cddcbbb, Jun 24 2026, 20:02:47) [GCC 15.2.1 20260123 (Red Hat 15.2.1-7)]
== Linux-7.0.12-101.fc43.x86_64-x86_64-with-glibc2.42 little-endian
== Python build: debug
== cwd: /home/stan/dev/cpython/build/test_python_worker_124469æ
== CPU count: 16
== encodings: locale=UTF-8 FS=utf-8
== resources (1): extralargefile

Using random seed: 2703420052
0:00:00 load avg: 1.79 mem: 27.0 MiB Run 1 test sequentially in a single process
0:00:00 load avg: 1.79 mem: 27.0 MiB [1/1] test_zipfile64
test_strip_removed_large_file_with_dd_no_sig (test.test_zipfile64.TestRepack.test_strip_removed_large_file_with_dd_no_sig)
Should scan for the data descriptor (without signature) of a removed ... FAIL

======================================================================
FAIL: test_strip_removed_large_file_with_dd_no_sig (test.test_zipfile64.TestRepack.test_strip_removed_large_file_with_dd_no_sig)
Should scan for the data descriptor (without signature) of a removed
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/stan/dev/cpython/Lib/test/test_zipfile64.py", line 215, in test_strip_removed_large_file_with_dd_no_sig
    self.assertLess(peak, self.allowed_memory)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 1027764 not less than 204800

----------------------------------------------------------------------
Ran 1 test in 200.611s

FAILED (failures=1)
test test_zipfile64 failed
0:03:20 load avg: 1.57 mem: 32.0 MiB [1/1/1] test_zipfile64 failed (1 failure) in 3 min 20 sec

== Tests result: FAILURE ==

1 test failed:
    test_zipfile64

Total duration: 3 min 20 sec
Total tests: run=1 (filtered) failures=1
Total test files: run=1/1 (filtered) failed=1
Result: FAILURE

This test was added recently in aec0aed by @danny0838 and @gpshead.

CPython versions tested on:

CPython main branch

Operating systems tested on:

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