Invalid access to memory - _ssh_conn_processed_data

I was logged in with winSCP to some server, to check whether some files and folders were there.

Next, I was running and changing some scripts which were using an ssh connection to that same server.

A couple of hours later, less than 10 minutes after I ran that script again, this error suddenly popped up.

The same thing has happened once or twice before during the last 7 days.

WinSCP 6.5

Error message:
Invalid access to memory.

Stack trace:
(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(0008818F) ntdll.dll
(00074711) ntdll.dll.KiUserExceptionDispatcher
(00B88AF0) _ssh_conn_processed_data
(00B895B4) _ssh_is_bare
(00C99910) TSecureShell::FreeBackend
(00C93FAC) TSecureShell::Open
(00CEF585) TSFTPFileSystem::Open
(00D323CB) TTerminal::Reopen
(00C48A89) TTerminalThread::TerminalReopenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00EF52B1)
(00EF688B)
(00D302FA) TTerminal::Open
(00D323CB) TTerminal::Reopen
(00C48A89) TTerminalThread::TerminalReopenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(0001ECC7) KERNEL32.DLL.BaseThreadInitThunk
(000672AC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00067279) ntdll.dll.RtlGetAppContainerNamedObjectPath

The problem happens rarely. I cannot reproduce it.

With a single server connection open I sent my w11 machine to sleep and woke it back up. Immediately after, this error occurred. I assume some windows API handles were invalidated in the process of going into standby and waking back up or something similar.
I don't know if this is reproducible.

WinSCP 6.5

Error message:
Invalid access to memory.

Stack trace:
(00B74789) C4406_0
(00EF4C46)
(00EF6CBE)
(00EF3A68) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B88AF0) _ssh_conn_processed_data
(00B895B4) _ssh_is_bare
(00C99910) TSecureShell::FreeBackend
(00C93FAC) TSecureShell::Open
(00CEF585) TSFTPFileSystem::Open
(00D323CB) TTerminal::Reopen
(00C48A89) TTerminalThread::TerminalReopenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF52B1)
(00EF688B)
(00D302FA) TTerminal::Open
(00D323CB) TTerminal::Reopen
(00C48A89) TTerminalThread::TerminalReopenEvent
(00C437F8) TSignalThread::Execute
(000DF43B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) 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 6.5.1

Error message:
Invalid access to memory.

Stack trace:
(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(000B0C7F) ntdll.dll
(0007ABCA) ntdll.dll.KiUserExceptionDispatcher
(00B88C34) _ssh_conn_processed_data
(00B896F8) _ssh_is_bare
(00C99A74) TSecureShell::FreeBackend
(00C94110) TSecureShell::Open
(00CEF6E9) TSFTPFileSystem::Open
(00D3252F) TTerminal::Reopen
(00C48BCD) TTerminalThread::TerminalReopenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D3045E) TTerminal::Open
(00D3252F) TTerminal::Reopen
(00C48BCD) TTerminalThread::TerminalReopenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00014D47) KERNEL32.DLL.BaseThreadInitThunk
(0006BF09) ntdll.dll
(0006BE8C) ntdll.dll

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.

@anuy9755: 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 6.5.1

Error message:
Accès mémoire invalide.

Trace de la pile :
(00B748CD) C4406_0
(00EF4DCA)
(00EF6E42)
(00EF3BEC) __ExceptionHandler
(0009990F) ntdll.dll
(00078441) ntdll.dll.KiUserExceptionDispatcher
(00B88C34) _ssh_conn_processed_data
(00B896F8) _ssh_is_bare
(00C99A74) TSecureShell::FreeBackend
(00C94110) TSecureShell::Open
(00CEF6E9) TSFTPFileSystem::Open
(00D3252F) TTerminal::Reopen
(00C48BCD) TTerminalThread::TerminalReopenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B369) ntdll.dll
(0006B2EA) ntdll.dll

(00EF5435)
(00EF6A0F)
(00D3045E) TTerminal::Open
(00D3252F) TTerminal::Reopen
(00C48BCD) TTerminalThread::TerminalReopenEvent
(00C4393C) TSignalThread::Execute
(000DF45B) Userinterface::C20_0
(00016BA7) KERNEL32.DLL.BaseThreadInitThunk
(0006B369) ntdll.dll
(0006B2EA) ntdll.dll

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.

@pierre.ndjiki: 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.

The notebook was running over night and lost access to the VPN (and presumably the established connectoin has been broken).

The WinSCP was executed in portable mode.

WinSCP 6.5.1

Error message:
Invalid access to memory.

Stack trace:
(00B748CD)
(00EF4DCA)
(00EF6E42)
(00EF3BEC)
(0009990F) ntdll.dll
(00078441) ntdll.dll.KiUserExceptionDispatcher
(00B88C34)
(00B896F8)
(00C99A74)
(00C92B34)
(00CEF4DD) @@Sessioninfo@Finalize
(00D2E353)
(000C64B6)
(000CB04A)
(000CADC2)
(000C99EF)
(000C94B0)
(0012A38B)
(000033BB)
(00EF2B0D)
(0006B369) ntdll.dll
(0006B2EA) ntdll.dll

The problem happens rarely. I cannot reproduce it.