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Added/Updated tests\bugs\gh_8252_test.py: Resultset of cursor that executes using instance of selectable PreparedStatement must be stored in some variable in order to have ability close it EXPLICITLY, before PS will be freed. Otherwise access violation can raises when Python runs garbage collection.

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pavel-zotov 2025-01-18 14:34:14 +03:00
parent 43524fadea
commit a8acc18168
1 changed files with 22 additions and 3 deletions
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tests/bugs/gh_8252_test.py
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@ -12,6 +12,13 @@ NOTES:
2. Custom driver config object is created here for using 'SubQueryConversion = true'. 2. Custom driver config object is created here for using 'SubQueryConversion = true'.
3. Additional test was made for this issue: tests/functional/tabloid/test_aae2ae32.py 3. Additional test was made for this issue: tests/functional/tabloid/test_aae2ae32.py
[18.01.2025] pzotov
Resultset of cursor that executes using instance of selectable PreparedStatement must be stored
in some variable in order to have ability close it EXPLICITLY (before PS will be freed).
Otherwise access violation raises during Python GC and pytest hangs at final point (does not return control to OS).
This occurs at least for: Python 3.11.2 / pytest: 7.4.4 / firebird.driver: 1.10.6 / Firebird.Qa: 0.19.3
The reason of that was explained by Vlad, 26.10.24 17:42 ("oddities when use instances of selective statements").
Confirmed bug on 5.0.2.1497. Confirmed bug on 5.0.2.1497.
Checked on 5.0.2.1499-5fa4ae6. Checked on 5.0.2.1499-5fa4ae6.
""" """
@ -65,11 +72,23 @@ def test_1(act: Action, capsys):
print(r[0],r[1]) print(r[0],r[1])
ps = cur.prepare(test_sql) ps = cur.prepare(test_sql)
# Show explained plan:
print( '\n'.join([replace_leading(s) for s in ps.detailed_plan.split('\n')]) ) print( '\n'.join([replace_leading(s) for s in ps.detailed_plan.split('\n')]) )
for r in cur.execute(ps):
print(r[0])
con.rollback()
# ::: NB ::: 'ps' returns data, i.e. this is SELECTABLE expression.
# We have to store result of cur.execute(<psInstance>) in order to
# close it explicitly.
# Otherwise AV can occur during Python garbage collection and this
# causes pytest to hang on its final point.
# Explained by hvlad, email 26.10.24 17:42
rs = cur.execute(ps)
for r in rs:
print(r[0])
rs.close() # <<< EXPLICITLY CLOSING CURSOR RESULTS
ps.free()
con.rollback()
act.expected_stdout = """ act.expected_stdout = """
SubQueryConversion true SubQueryConversion true