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Details

Type: Bug
Resolution: Fixed
Priority: Not Evaluated
Fix Version/s: 6.5.0
Affects Version/s: 6.3.1, 6.4.1
Component/s: PySide
Labels:
None
Environment:
Python 3.8
Qt 6.4.1 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2019) [limited API]

Platform/s:

Windows
Commits:
1270a9e82e5bc3bd53a1131698ece60403da1192, 15ccf2484 (dev), e42f576bf (6.4), cec835ba1 (tqtc/lts-6.2), 46ab90a5f (dev), afffc5838 (6.5), 9529690b4 (dev), 1d429a7b5 (6.7), eaff347f5 (6.6), c777151d2 (tqtc/lts-6.5), 279658b85 (dev), 66a58efd8 (6.7)

Description

Program crashes with an "access violation" error when running the attached script:

Python 3.8
Qt 6.4.1 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2019) [limited API]
Windows fatal exception: access violation

Current thread 0x00002388 (most recent call first):
  File ".\testthreads.py", line 32 in <module>

If the script is changed so that `obj = A()` instead of `obj = B()`, the crash does not occur.

This also occurs if the `c` object is used (for example emitting the signal), as long as the operation is not blocking (in our case it emits a queued signal) or the target thread is congested.

Linux

Out of memory  in QtCore/qarraydatapointer.h, line 215

Attachments

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pyside214_cpp.zip
1 kB
06 Dec '22 12:14
pyside2141_diag.diff
3 kB
06 Dec '22 16:26
pyside2141_log.txt
1 kB
06 Dec '22 16:26
pyside2141_stack.txt
35 kB
05 Dec '22 20:16
pyside2141_valgrind.txt
903 kB
06 Dec '22 07:15
pyside2141.py
1 kB
06 Dec '22 11:55
testthreads.py
0.6 kB
05 Dec '22 17:03

Issue Links

relates to

PYSIDE-2646 [REG: 6.2->6.5] Connections to lambda or nested function prevent destruction of objects they refer to

Closed

resulted in

PYSIDE-2299 REG->6.5: Memory/Reference Leak with connecting signals to lambda functions referencing "self"

Closed

PYSIDE-2371 REG->6.5: Memory leak connecting signal to local function

Closed

Gerrit Reviews

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For Gerrit Dashboard: PYSIDE-2141
#	Subject	Branch	Project	Status	CR	V
447214,2	libpyside: Improve class documentation of GlobalReceiverV2	dev	pyside/pyside-setup	Status: MERGED	+2	0
447215,5	Fix a crash when deleting QObject instances with connections in threads	dev	pyside/pyside-setup	Status: MERGED	+2	0
447286,2	libpyside: Improve class documentation of GlobalReceiverV2	6.4	pyside/pyside-setup	Status: MERGED	+2	0
447288,2	libpyside: Improve class documentation of GlobalReceiverV2	tqtc/lts-6.2	pyside/tqtc-pyside-setup	Status: MERGED	+2	0
447571,3	libpyside: Potential fix for crashing signals/disconnect_test.py	dev	pyside/pyside-setup	Status: MERGED	+2	0
487671,5	PySide6/SignalManager: Fix memory leaks connecting free methods/lambdas	dev	pyside/pyside-setup	Status: MERGED	+2	0
488261,2	PySide6/SignalManager: Fix memory leaks connecting free methods/lambdas	6.5	pyside/pyside-setup	Status: MERGED	+2	0
550981,2	libpyside: Fix spelling error in function name	dev	pyside/pyside-setup	Status: MERGED	+2	0
551018,2	libpyside: Fix spelling error in function name	6.7	pyside/pyside-setup	Status: MERGED	+2	0
551078,2	libpyside: Fix spelling error in function name	6.6	pyside/pyside-setup	Status: MERGED	+2	0
551144,2	libpyside: Fix spelling error in function name	tqtc/lts-6.5	pyside/tqtc-pyside-setup	Status: MERGED	+2	0
551913,7	libpyside/Signal manager: Ensure cleanup of main thread targets	dev	pyside/pyside-setup	Status: MERGED	+2	0
552276,2	libpyside/Signal manager: Ensure cleanup of main thread targets	6.7	pyside/pyside-setup	Status: MERGED	+2	0