Invalid access to memory - ntdll

I have configured an SSH local proxy which I access using a password (sent by the plink client over keyboard-interactive authentication, I believe). The same proxy string in Putty works.

plink -pw %pass %user@%proxyhost nc %host %port

WinSCP 5.9

Error message:
Invalid access to memory.

Stack trace:
(00613F49)
(0086216E)
(008641D6)
(00860F90)
(0008A61F) ntdll.dll
(00077E7A) ntdll.dll.KiUserExceptionDispatcher
(0060D8FF)
(00647A36)
(006478E2)
(006FB533)
(006FA76B)
(006F5B75)
(006F544A)
(0076C54E)
(006C57AB)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(008627D9)
(00863DB3)
(006F5C83)
(006F544A)
(0076C54E)
(006C57AB)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(008627D9)
(00863DB3)
(006F5D1E)
(006F544A)
(0076C54E)
(006C57AB)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(008627D9)
(00863DB3)
(006F5538)
(0076C54E)
(006C57AB)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(008627D9)
(00863DB3)
(0076C6E3)
(006C57AB)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll.dll
(00064DA9) ntdll.dll

(008627D9)
(00863DB3)
(0076CB45)
(006C57AB)
(006C0780)
(0009836F)
(000128F2) KERNEL32.DLL.BaseThreadInitThunk
(00064DE1) ntdll

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.

martin wrote:

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.

Many thanks. I'll try to reproduce the crash with the currently installed build tomorrow or Friday, then substitute the debug build.

<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 5.9.2

Error message:
Invalid pointer operation

Stack trace:
(00863EB1) C5073_3
(0086548B) _ReThrowException
(0076DF15) TTerminal::Open
(0076F49F) TTerminal::Reopen
(006C6A2D) TTerminalThread::TerminalReopenEvent
(006C19F4) TSignalThread::Execute
(000987A7) Userinterface::C20_0
(000152C2) KERNEL32.DLL.BaseThreadInitThunk
(0005F607) ntdll.dll
(0005F5CF) ntdll.dll

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 5.9.4

Error message:
Invalid access to memory.

Stack trace:
(00770004) TTerminal::Open
(00866B5E) C5073_0
(00868BC6) ____ExceptionHandler
(00865980) __ExceptionHandler
(00081D3F) ntdll.dll
(0006F8EA) ntdll.dll.KiUserExceptionDispatcher
(006C8C3F) TTerminalThread::TerminalOpenEvent
(006C3C14) TSignalThread::Execute
(00098B63) Userinterface::C20_0
(000152C2) KERNEL32.DLL.BaseThreadInitThunk
(0005FFD7) ntdll.dll
(0005FF9F) ntdll.dll

(008671C9) C5073_0
(008687A3) _ReThrowException
(0077066D) TTerminal::Open
(006C8C3F) TTerminalThread::TerminalOpenEvent
(006C3C14) TSignalThread::Execute
(00098B63) Userinterface::C20_0
(000152C2) KERNEL32.DLL.BaseThreadInitThunk
(0005FFD7) ntdll.dll
(0005FF9F) ntdll.dll

Stack trace:
(007A0AA7) TAuthenticateForm::Execute
(00866B5E) C5073_0
(00868BC6) ____ExceptionHandler
(00865980) __ExceptionHandler
(00081D3F) ntdll.dll
(0006F8EA) ntdll.dll.KiUserExceptionDispatcher
(007A057A) TAuthenticateForm::PromptUser
(0008CDC9) TTerminalManager::TerminalPromptUser
(006C9DA5) TPromptUserAction::Execute
(006C8A21) TTerminalThread::TerminalOpen
(0008B4A3) TTerminalManager::ConnectActiveTerminalImpl
(0008B5CC) TTerminalManager::ConnectActiveTerminal
(0008BE7D) TTerminalManager::DoSetActiveTerminal
(0008BBDA) TTerminalManager::SetActiveTerminal
(00017098) TCustomScpExplorerForm::NewSession
(0001C09C) TCustomScpExplorerForm::SessionsPageControlChange
(0024F269) Vcl::Controls::TWinControl::WndProc
(0024A360) Vcl::Controls::TC

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 5.13.3

Error message:
Invalid access to memory.

Stack trace:
(007B4E95) TTerminal::Open
(008BCA5A) C5104_0
(008BEAC2) ____ExceptionHandler
(008BB87C) __ExceptionHandler
(00089B5F) ntdll.dll
(00070A21) ntdll.dll.KiUserExceptionDispatcher
(006F193B) TTerminalThread::TerminalOpenEvent
(006EC950) TSignalThread::Execute
(000A329F) Userinterface::C20_0
(00017672) KERNEL32.DLL.BaseThreadInitThunk
(00064D85) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00064D52) ntdll.dll.RtlGetAppContainerNamedObjectPath

(008BD0C5) C5104_0
(008BE69F) _ReThrowException
(007B554D) TTerminal::Open
(006F193B) TTerminalThread::TerminalOpenEvent
(006EC950) TSignalThread::Execute
(000A329F) Userinterface::C20_0
(00017672) KERNEL32.DLL.BaseThreadInitThunk
(00064D85) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00064D52) ntdll.dll.RtlGetAppContainerNamedObjectPath

The problem happens rarely. I cannot reproduce it.