STINNER Victor <vstin...@redhat.com> added the comment:
If I modify libregrtest with the following patch:
diff --git a/Lib/test/libregrtest/refleak.py b/Lib/test/libregrtest/refleak.py
index 0bb8a0a2bf..f0225a9768 100644
--- a/Lib/test/libregrtest/refleak.py
+++ b/Lib/test/libregrtest/refleak.py
@@ -128,7 +128,7 @@ def dash_R(ns, the_module, test_name, test_func):
failed = False
for deltas, item_name, checker in [
(rc_deltas, 'references', check_rc_deltas),
- (alloc_deltas, 'memory blocks', check_rc_deltas),
+ (alloc_deltas, 'memory blocks', check_fd_deltas),
(fd_deltas, 'file descriptors', check_fd_deltas)
]:
# ignore warmup runs
And I add the following file Lib/test/test_noop.py:
import unittest
class NoopTests(unittest.TestCase):
def test_noop(self):
pass
regrtest detects a "leak":
$ ./python -m test -R 3:3 test_noop
Run tests sequentially
0:00:00 load avg: 0.55 [1/1] test_noop
beginning 6 repetitions
123456
......
test_noop leaked [0, 1, 0] memory blocks, sum=1
test_noop failed
== Tests result: FAILURE ==
1 test failed:
test_noop
Total duration: 113 ms
Tests result: FAILURE
The issue comes from this look in Lib/test/libregrtest/refleak.py:
for i in range(repcount):
indirect_test()
alloc_after, rc_after, fd_after = dash_R_cleanup(fs, ps, pic, zdc,
abcs)
print('.', end='', file=sys.stderr, flush=True)
if i >= nwarmup:
rc_deltas[i] = get_pooled_int(rc_after - rc_before)
alloc_deltas[i] = get_pooled_int(alloc_after - alloc_before)
fd_deltas[i] = get_pooled_int(fd_after - fd_before)
alloc_before = alloc_after
rc_before = rc_after
fd_before = fd_after
Because of "if i >= nwarmup:", get_pooled_int() isn't call during "warmup",
whereas the purpose of the warmup is to warmup *everything*.
Maybe get_pooled_int() allocates one frame object and keeps it alive in its
"zombi frame". Maybe something else is allocated and kept alive.
Anything, removing "if i >= nwarmup:" to always compute deltas fix this
specific issue.
Attached PR 12744 fix this bug.
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36560>
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