cpython/Lib/test/test_json
Miss Islington (bot) 1b457d3bbc
[3.15] Skip test_highly_nested_objects_decoding during the PGO profile task. (GH-151460) (#151468)
Skip test_highly_nested_objects_decoding during the PGO profile task. (GH-151460)

Since the recursion guard tracks real C-stack bounds (gh-91079), this test
asserts that 500k nesting levels overflow the stack margin. On a 64 MiB stack
(some Nix build envs use one that large), the optimized interpreter uses ~160
bytes/level (raises at ~420k levels) so the assertion holds with only ~16%
margin; the PGO *instrumented* stage inlines less, its per-level scanner frames
are smaller, and the 500k-deep decode completes -- "RecursionError not raised"
fails the profile run and aborts `make profile-opt`. Upstream's
skip_if_unlimited_stack_size (gh-143460) only covers RLIM_INFINITY, not
large-finite stacks like ours.

We could also keep playing whack a mole and raise the 500k to a much larger
number... but there's little value in PGO training on this test anyways.
(cherry picked from commit e91f68ab40)

Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
2026-06-14 11:37:23 -07:00
..
__init__.py
__main__.py
json_lines.jsonl
test_decode.py
test_default.py
test_dump.py
test_encode_basestring_ascii.py
test_enum.py
test_fail.py
test_float.py
test_indent.py
test_pass1.py
test_pass2.py
test_pass3.py
test_recursion.py [3.15] Skip test_highly_nested_objects_decoding during the PGO profile task. (GH-151460) (#151468) 2026-06-14 11:37:23 -07:00
test_scanstring.py
test_separators.py
test_speedups.py
test_tool.py
test_unicode.py