Invalid access to memory - System::Syncobjs::TCriticalSection::Leave

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.7.4

Error message:
Invalid access to memory.

Stack trace:
(0037E92A) System::Syncobjs::TCriticalSection::Leave
(007E344A) C4799_3
(007E54B2) ____ExceptionHandler
(007E242C) __ExceptionHandler
(00041E3E) ntdll.dll.RtlRaiseStatus
(00041CB6) ntdll.dll.KiUserExceptionDispatcher
(0066FF6B) TTerminalQueue::Idle
(00079C0A) TTerminalManager::Idle
(00014C3F) TCustomScpExplorerForm::Idle
(000379D7) TNonVisualDataModule::DoIdle
(00037994) TNonVisualDataModule::SessionIdleTimerTimer
(0033FF8C) System::Classes::_18201
(000067D5) USER32.DLL
(000068C6) USER32.DLL
(00007998) USER32.DLL
(00007A61) USER32.DLL.DispatchMessageW

(007E3AB5) C4799_3
(007E508F) _ReThrowException
(00079C26) TTerminalManager::Idle
(00014C3F) TCustomScpExplorerForm::Idle
(000379D7) TNonVisualDataModule::DoIdle
(00037994) TNonVisualDataModule::SessionIdleTimerTimer
(0033FF8C) System::Classes::_18201
(000067D5) USER32.DLL
(000068C6) USER32.DLL
(00007998) USER32.DLL
(00007A61) USER32.DLL.DispatchMessageW

The problem happens rarely. I cannot reproduce it.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.7.6

Error message:
Invalid access to memory.

Stack trace:
(0037EBF6) System::Syncobjs::TCriticalSection::Leave
(007E46BA) C4799_3
(007E6722) ____ExceptionHandler
(007E369C) __ExceptionHandler
(0005A5DA) ntdll.dll
(0000F12E) ntdll.dll.KiUserExceptionDispatcher
(00670D6F) TTerminalQueue::Idle
(00079C36) TTerminalManager::Idle
(00014C47) TCustomScpExplorerForm::Idle
(000379EB) TNonVisualDataModule::DoIdle
(000379A8) TNonVisualDataModule::SessionIdleTimerTimer
(003402A8) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167CE) USER32.dll
(00016895) USER32.dll.DispatchMessageW

(007E4D25) C4799_3
(007E62FF) _ReThrowException
(00079C52) TTerminalManager::Idle
(00014C47) TCustomScpExplorerForm::Idle
(000379EB) TNonVisualDataModule::DoIdle
(000379A8) TNonVisualDataModule::SessionIdleTimerTimer
(003402A8) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167CE) USER32.dll
(00016895) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.9.5

Error message:
Acceso a memoria no válido

Traza de la pila:
(003B1C5E) System::Syncobjs::TCriticalSection::Leave
(0086700E) C5073_3
(00869076) ____ExceptionHandler
(00865E30) __ExceptionHandler
(00045D46) ntdll.dll.RtlRaiseStatus
(00045BD2) ntdll.dll.KiUserExceptionDispatcher
(006C536B) TTerminalQueue::Idle
(0008EF19) TTerminalManager::Idle
(00016C9F) TCustomScpExplorerForm::Idle
(0003D057) TNonVisualDataModule::DoIdle
(0003D014) TNonVisualDataModule::SessionIdleTimerTimer
(0037326C) System::Classes::_18201
(0001B4B4) USER32.dll
(0001B5B2) USER32.dll
(0001BBE4) USER32.dll
(0001BC3B) USER32.dll.DispatchMessageW

(00867679) C5073_3
(00868C53) _ReThrowException
(0008EF35) TTerminalManager::Idle
(00016C9F) TCustomScpExplorerForm::Idle
(0003D057) TNonVisualDataModule::DoIdle
(0003D014) TNonVisualDataModule::SessionIdleTimerTimer
(0037326C) System::Classes::_18201
(0001B4B4) USER32.dll
(0001B5B2) USER32.dll
(0001BBE4) USER32.dll
(0001BC3B) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.13.4

Error message:
Accès mémoire invalide.

Trace de la pile :
(003BF73A) System::Syncobjs::TCriticalSection::Leave
(008BDC8E) C5104_3
(008BFCF6) ____ExceptionHandler
(008BCAB0) __ExceptionHandler
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(006EEBFF) TTerminalQueue::Idle
(00099961) TTerminalManager::Idle
(000175BF) TCustomScpExplorerForm::Idle
(0003EDF7) TNonVisualDataModule::DoIdle
(0003EDB4) TNonVisualDataModule::SessionIdleTimerTimer
(00380D20) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

(008BE2F9) C5104_3
(008BF8D3) _ReThrowException
(0009997D) TTerminalManager::Idle
(000175BF) TCustomScpExplorerForm::Idle
(0003EDF7) TNonVisualDataModule::DoIdle
(0003EDB4) TNonVisualDataModule::SessionIdleTimerTimer
(00380D20) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.13.6

Error message:
Invalid access to memory.

Stack trace:
(003BFB32) System::Syncobjs::TCriticalSection::Leave
(008BF022) C5105_0
(008C108A) ____ExceptionHandler
(008BDE44) __ExceptionHandler
(00002275) ntdll.dll.RtlConvertUlongToLargeInteger
(0000D485) ntdll.dll.KiUserExceptionDispatcher
(006EFE6F) TTerminalQueue::Idle
(00099B55) TTerminalManager::Idle
(0001767B) TCustomScpExplorerForm::Idle
(0003EEEF) TNonVisualDataModule::DoIdle
(0003EEAC) TNonVisualDataModule::SessionIdleTimerTimer
(00381118) System::Classes::_18201
(00007731) USER32.dll
(00007811) USER32.dll
(000079C8) USER32.dll
(00007A0B) USER32.dll.DispatchMessageW

(008BF68D) C5105_0
(008C0C67) _ReThrowException
(00099B71) TTerminalManager::Idle
(0001767B) TCustomScpExplorerForm::Idle
(0003EEEF) TNonVisualDataModule::DoIdle
(0003EEAC) TNonVisualDataModule::SessionIdleTimerTimer
(00381118) System::Classes::_18201
(00007731) USER32.dll
(00007811) USER32.dll
(000079C8) USER32.dll
(00007A0B) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.