Chyba přístupu do paměti - _select_result

<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 5.15.1

Error message:
Chyba přístupu do paměti.

Stack trace:
(0000085D)mswsock.dll
(0092636E) C5153_3
(009283D6) ____ExceptionHandler
(00925190) __ExceptionHandler
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(000020A1) WS2_32.DLL.ioctlsocket
(006C6209) _select_result
(00793EEA) TSecureShell::HandleNetworkEvents
(007941AE) TSecureShell::ProcessNetworkEvents
(00793797) TSecureShell::WaitForData
(0078E80D) TSecureShell::Init
(0078E16A) TSecureShell::Open
(0081255D) TTerminal::Open
(0074E1CB) TTerminalThread::TerminalOpenEvent
(00749128) TSignalThread::Execute
(000BB14B) Userinterface::C20_0
(0001243B) kernel32.dll.BaseThreadInitThunk
(00038800) ntdll.dll
(000387D0) ntdll.dll

(009269D9) C5153_3
(00927FB3) _ReThrowException
(0078E91B) TSecureShell::Init
(0078E16A) TSecureShell::Open
(0081255D) TTerminal::Open
(0074E1CB) TTerminalThread::TerminalOpenEvent
(00749128) TSignalThread::Execute
(000BB14B) Userinterface::C20_0
(0001243B) kernel32.dll.BaseThreadInitThunk
(00038800) ntdll.dll
(000387D0) ntdll.dll

(009269D9) C5153_3
(00927FB3) _ReThrowException
(0078E9B6) TSecureShell::Init
(0078E16A) TSecureShell::Open
(0081255D) TTerminal::Open
(0074E1CB) TTerminalThread::TerminalOpenEvent
(00749128) TSignalThread::Execute
(000BB14B) Userinterface::C20_0
(0001243B) kernel32.dll.BaseThreadInitThunk
(00038800) ntdll.dll
(000387D0) ntdll.dll

(009269D9) C5153_3
(00927FB3) _ReTh

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 5.15.2

Error message:
Zugriffsverletzung - ungültiger Zugriff auf den Speicher.

Stack trace:
(006C708A) _select_result
(0092709A) C5157_3
(00929102) ____ExceptionHandler
(00925EBC) __ExceptionHandler
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(00794BEE) TSecureShell::HandleNetworkEvents
(00794EB2) TSecureShell::ProcessNetworkEvents
(007957B1) TSecureShell::Idle
(0081229B) TTerminal::Idle
(0074BC3F) TTerminalItem::Idle
(0074AFD3) TTerminalQueue::Idle
(000AEA69) TTerminalManager::Idle
(00018892) TCustomScpExplorerForm::Idle
(0004822F) TNonVisualDataModule::DoIdle
(000481EC) TNonVisualDataModule::SessionIdleTimerTimer
(003A3BA8) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

(004176D3) System::DoneExcept
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(003A3BA8) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) USER32.dll.DispatchMessageW

(004172C0) System::HandleAnyException
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(003A3BA8) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167BF) USER32.dll
(00016885) 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 5.15.4

Error message:
Invalid access to memory.

Stack trace:
(006C8062) _select_result
(00928272) C5157_3
(0092A2DA) ____ExceptionHandler
(00927094) __ExceptionHandler
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(00795D26) TSecureShell::HandleNetworkEvents
(00795FEA) TSecureShell::ProcessNetworkEvents
(007968E9) TSecureShell::Idle
(008133D3) TTerminal::Idle
(0074CC63) TTerminalItem::Idle
(0074BFF7) TTerminalQueue::Idle
(000AEB79) TTerminalManager::Idle
(00018862) TCustomScpExplorerForm::Idle
(000482C7) TNonVisualDataModule::DoIdle
(00048284) TNonVisualDataModule::SessionIdleTimerTimer
(003A3E28) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167C2) USER32.dll
(00016885) USER32.dll.DispatchMessageW

(00417953) System::DoneExcept
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(003A3E28) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167C2) USER32.dll
(00016885) USER32.dll.DispatchMessageW

(00417540) System::HandleAnyException
(0006248E) ntdll.dll
(0000F15E) ntdll.dll.KiUserExceptionDispatcher
(003A3E28) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167C2) 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.