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Added/Updated tests\bugs\core_6048_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 16:26:13 +03:00
parent bdce103159
commit da0580b307
1 changed files with 56 additions and 29 deletions
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tests/bugs/core_6048_test.py
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@ -33,6 +33,13 @@ NOTES:
::: NB-2 :::
Careful tuning required on each tesing box for this test.
[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").
"""
import os
@ -125,39 +132,59 @@ def test_1(act: Action, capsys):
print( e.__str__() )
cur2 = con2.cursor()
ps = cur2.prepare('select mon$crypt_page, mon$crypt_state from mon$database')
ps, rs = None, None
# This will store different number of pages which are currently encrypted.
# When length of this set will exceed ENCRYPTING_PAGES_MIN_CNT then we break from loop:
#
encrypting_pages_set = set()
waiting_in_loop = -1
while encryption_started:
t2=py_dt.datetime.now()
d1=t2-t1
waiting_in_loop = d1.seconds*1000 + d1.microseconds//1000
if waiting_in_loop > MAX_WAITING_ENCR_FINISH:
print(f'TIMEOUT EXPIRATION: encryption took {d1.seconds*1000 + d1.microseconds//1000} ms which exceeds limit = {MAX_WAITING_ENCR_FINISH} ms.')
break
try:
ps = cur2.prepare('select mon$crypt_page, mon$crypt_state from mon$database')
cur2.execute(ps)
crypt_page, crypt_state = cur2.fetchone()
con2.commit()
# This will store different number of pages which are currently encrypted.
# When length of this set will exceed ENCRYPTING_PAGES_MIN_CNT then we break from loop:
#
encrypting_pages_set = set()
waiting_in_loop = -1
while encryption_started:
t2=py_dt.datetime.now()
d1=t2-t1
waiting_in_loop = d1.seconds*1000 + d1.microseconds//1000
if waiting_in_loop > MAX_WAITING_ENCR_FINISH:
print(f'TIMEOUT EXPIRATION: encryption took {d1.seconds*1000 + d1.microseconds//1000} ms which exceeds limit = {MAX_WAITING_ENCR_FINISH} ms.')
break
# 0 = non crypted;
# 1 = has been encrypted;
# 2 = is DEcrypting;
# 3 = is Encrypting;
if crypt_state == RUNNING_ENCRYPTING_STATE:
encrypting_pages_set.add(crypt_page,)
# ::: 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 = cur2.execute(ps)
for r in rs:
crypt_page, crypt_state = r[:2]
con2.commit()
if crypt_state == COMPLETED_ENCRYPTION_STATE:
encryption_finished = True
break
elif len(encrypting_pages_set) > ENCRYPTING_PAGES_MIN_CNT:
break
else:
time.sleep(0.5)
# 0 = non crypted;
# 1 = has been encrypted;
# 2 = is DEcrypting;
# 3 = is Encrypting;
if crypt_state == RUNNING_ENCRYPTING_STATE:
encrypting_pages_set.add(crypt_page,)
if crypt_state == COMPLETED_ENCRYPTION_STATE:
encryption_finished = True
break
elif len(encrypting_pages_set) > ENCRYPTING_PAGES_MIN_CNT:
break
else:
time.sleep(0.1)
except DatabaseError as e:
print( e.__str__() )
print(e.gds_codes)
finally:
if rs:
rs.close() # <<< EXPLICITLY CLOSING CURSOR RESULTS
if ps:
ps.free()
# ---------------------------------------------------------