Invalid access to memory - TCustomScpExplorerForm::UpdateTerminal

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>

This connection was to a computer on my local home network. I had gone to sleep last night with it still connected. This morning, I found that my Putty connection had disconnected from an apparent lost network connection.

After the network reconnected, WinSCP also reconnect and was waiting at the login screen for me. I clicked "Cancel" (or the verbiage similar to that). The error message window popped up.

<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.13.1

Error message:
Invalid access to memory.

Stack trace:
(0001AAC6) TCustomScpExplorerForm::UpdateTerminal
(008BA3F6) C5101_0
(008BC45E) ____ExceptionHandler
(008B9218) __ExceptionHandler
(00088D1F) ntdll.dll
(0006FC11) ntdll.dll.KiUserExceptionDispatcher
(000417DF) TScpCommanderForm::UpdateTerminal
(00005D6C) TCustomScpExplorerForm::TerminalChanging
(00094BF3) TTerminalManager::DoSetActiveTerminal
(00094B7E) TTerminalManager::SetActiveTerminal
(000940A3) TTerminalManager::FreeActiveTerminal
(00094892) TTerminalManager::ReconnectActiveTerminal
(000A31A9) ShowExtendedExceptionEx
(0001D614) TCustomScpExplorerForm::ShowExtendedException
(00095D91) TTerminalManager::TerminalShowExtendedException
(007B60E8) TTerminal::ShowExtendedException
(0021D95E) Vcl::Forms::TApplication::HandleException
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(00094986) TTerminalManager::FreeTerminal
(00088D1F) ntdll.dll
(0006FC11) ntdll.dll.KiUserExceptionDispatcher
(000940A3) TTerminalManager::FreeActiveTerminal
(000A31A9) ShowExtendedExceptionEx
(0001D614) TCustomScpExplorerForm::ShowExtendedException
(00095D91) TTerminalManager::TerminalShowExtendedException
(007B60E8) TTerminal::ShowExtendedException
(0021D95E) Vcl::Forms::TApplication::HandleException
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(00361CDD) System::Classes::TList::Get
(00361CDD) System::Classes::TList::Get
(000940A3) TTerminalManager::FreeActiveTerminal
(000A31A9) ShowExtendedExceptionEx
(0001D614) TCustomScpExplorerForm::ShowExtendedException
(00095D91) TTerminalManager::TerminalShowExtendedException
(007B60E8) TTerminal::ShowExtendedException
(0021D95E) Vcl::Forms::TApplication::HandleException
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(003F046C) System::HandleAnyException
(00088D1F) ntdll.dll
(0006FC11) ntdll.dll.KiUserExceptionDispatcher
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.

When I click the "Ok" button or the "X" in the upper right corner to close the dialog box, the dialog box disappears and instantly reappears.

<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 5.13.1

Error message:
Zugriffsverletzung - ungültiger Zugriff auf den Speicher.

Stack trace:
(0001AAC6) TCustomScpExplorerForm::UpdateTerminal
(008BA3F6) C5101_0
(008BC45E) ____ExceptionHandler
(008B9218) __ExceptionHandler
(00088DBF) ntdll.dll
(0006FCB1) ntdll.dll.KiUserExceptionDispatcher
(000417DF) TScpCommanderForm::UpdateTerminal
(00005D6C) TCustomScpExplorerForm::TerminalChanging
(00094BF3) TTerminalManager::DoSetActiveTerminal
(00094B7E) TTerminalManager::SetActiveTerminal
(000940A3) TTerminalManager::FreeActiveTerminal
(00094892) TTerminalManager::ReconnectActiveTerminal
(000A31A9) ShowExtendedExceptionEx
(0001D614) TCustomScpExplorerForm::ShowExtendedException
(00095D91) TTerminalManager::TerminalShowExtendedException
(007B60E8) TTerminal::ShowExtendedException
(0021D95E) Vcl::Forms::TApplication::HandleException
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(00094986) TTerminalManager::FreeTerminal
(00088DBF) ntdll.dll
(0006FCB1) ntdll.dll.KiUserExceptionDispatcher
(000940A3) TTerminalManager::FreeActiveTerminal
(000A31A9) ShowExtendedExceptionEx
(0001D614) TCustomScpExplorerForm::ShowExtendedException
(00095D91) TTerminalManager::TerminalShowExtendedException
(007B60E8) TTerminal::ShowExtendedException
(0021D95E) Vcl::Forms::TApplication::HandleException
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(00361CDD) System::Classes::TList::Get
(00361CDD) System::Classes::TList::Get
(000940A3) TTerminalManager::FreeActiveTerminal
(000A31A9) ShowExtendedExceptionEx
(0001D614) TCustomScpExplorerForm::ShowExtendedException
(00095D91) TTerminalManager::TerminalShowExtendedException
(007B60E8) TTerminal::ShowExtendedException
(0021D95E) Vcl::Forms::TApplication::HandleException
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(003F046C) System::HandleAnyException
(00088DBF) ntdll.dll
(0006FCB1) ntdll.dll.KiUserExceptionDispatcher
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) 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.

WinSCP was opened and running on a laptop with windows 10 64bits.

Computer goes to sleep.
I unplugged the laptop from its devices: power supply, (usb dock for screens and network).
I woke up the computer and logged-in (computer was very very very slow).
A lot of errors appeared on winscp (the same error appeared in loop).

WinSCP 5.13.1

Error message:
Accès mémoire invalide.

Trace de la pile :
(0001AAC6) TCustomScpExplorerForm::UpdateTerminal
(008BA3F6) C5101_0
(008BC45E) ____ExceptionHandler
(008B9218) __ExceptionHandler
(00088DBF) ntdll.dll
(0006FCB1) ntdll.dll.KiUserExceptionDispatcher
(000417DF) TScpCommanderForm::UpdateTerminal
(00005D6C) TCustomScpExplorerForm::TerminalChanging
(00094BF3) TTerminalManager::DoSetActiveTerminal
(00094B7E) TTerminalManager::SetActiveTerminal
(000940A3) TTerminalManager::FreeActiveTerminal
(00094892) TTerminalManager::ReconnectActiveTerminal
(000A31A9) ShowExtendedExceptionEx
(0001D614) TCustomScpExplorerForm::ShowExtendedException
(00095D91) TTerminalManager::TerminalShowExtendedException
(007B60E8) TTerminal::ShowExtendedException
(0021D95E) Vcl::Forms::TApplication::HandleException
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(00094986) TTerminalManager::FreeTerminal
(00088DBF) ntdll.dll
(0006FCB1) ntdll.dll.KiUserExceptionDispatcher
(000940A3) TTerminalManager::FreeActiveTerminal
(000A31A9) ShowExtendedExceptionEx
(0001D614) TCustomScpExplorerForm::ShowExtendedException
(00095D91) TTerminalManager::TerminalShowExtendedException
(007B60E8) TTerminal::ShowExtendedException
(0021D95E) Vcl::Forms::TApplication::HandleException
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(00361CDD) System::Classes::TList::Get
(00361CDD) System::Classes::TList::Get
(000940A3) TTerminalManager::FreeActiveTerminal
(000A31A9) ShowExtendedExceptionEx
(0001D614) TCustomScpExplorerForm::ShowExtendedException
(00095D91) TTerminalManager::TerminalShowExtendedException
(007B60E8) TTerminal::ShowExtendedException
(0021D95E) Vcl::Forms::TApplication::HandleException
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(003F046C) System::HandleAnyException
(00088DBF) ntdll.dll
(0006FCB1) ntdll.dll.KiUserExceptionDispatcher
(0037ED60) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) 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 5.13.3

Error message:
Invalid access to memory.

Stack trace:
(0001ABA6) TCustomScpExplorerForm::UpdateTerminal
(008BCA5A) C5104_0
(008BEAC2) ____ExceptionHandler
(008BB87C) __ExceptionHandler
(0003EF0E) ntdll.dll.ZwWow64CallFunction64
(0003F68A) ntdll.dll.KiUserExceptionDispatcher
(0004265F) TScpCommanderForm::UpdateTerminal
(00005E00) TCustomScpExplorerForm::TerminalChanging
(00095F83) TTerminalManager::DoSetActiveTerminal
(00095F0E) TTerminalManager::SetActiveTerminal
(00095433) TTerminalManager::FreeActiveTerminal
(00095C22) TTerminalManager::ReconnectActiveTerminal
(000A4579) ShowExtendedExceptionEx
(0001D6F4) TCustomScpExplorerForm::ShowExtendedException
(00097121) TTerminalManager::TerminalShowExtendedException
(007B8328) TTerminal::ShowExtendedException
(0021EF6E) Vcl::Forms::TApplication::HandleException
(00380370) System::Classes::_18201
(00007E6F) USER32.DLL.CallNextHookEx
(000080CC) USER32.DLL
(0000966A) USER32.DLL
(000096DB) USER32.DLL.DispatchMessageW

(00095D16) TTerminalManager::FreeTerminal
(0003EF0E) ntdll.dll.ZwWow64CallFunction64
(0003F68A) ntdll.dll.KiUserExceptionDispatcher
(00095433) TTerminalManager::FreeActiveTerminal
(000A4579) ShowExtendedExceptionEx
(0001D6F4) TCustomScpExplorerForm::ShowExtendedException
(00097121) TTerminalManager::TerminalShowExtendedException
(007B8328) TTerminal::ShowExtendedException
(0021EF6E) Vcl::Forms::TApplication::HandleException
(00380370) System::Classes::_18201
(00007E6F) USER32.DLL.CallNextHookEx
(000080CC) USER32.DLL
(0000966A) US

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:
Invalid access to memory.

Stack trace:
(0001ABA6) TCustomScpExplorerForm::UpdateTerminal
(008BDC8E) C5104_3
(008BFCF6) ____ExceptionHandler
(008BCAB0) __ExceptionHandler
(0007DAFF) ntdll.dll
(0006B711) ntdll.dll.KiUserExceptionDispatcher
(00005E00) TCustomScpExplorerForm::TerminalChanging
(000967CB) TTerminalManager::DoSetActiveTerminal
(00096756) TTerminalManager::SetActiveTerminal
(00095C9F) TTerminalManager::FreeActiveTerminal
(0009646A) TTerminalManager::ReconnectActiveTerminal
(000A4DE5) ShowExtendedExceptionEx
(0001D6F4) TCustomScpExplorerForm::ShowExtendedException
(00097969) TTerminalManager::TerminalShowExtendedException
(007B94BC) TTerminal::ShowExtendedException
(0021F91E) Vcl::Forms::TApplication::HandleException
(00380D20) System::Classes::_18201
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

(0009655E) TTerminalManager::FreeTerminal
(0007DAFF) ntdll.dll
(0006B711) ntdll.dll.KiUserExceptionDispatcher
(00095C9F) TTerminalManager::FreeActiveTerminal
(000A4DE5) ShowExtendedExceptionEx
(0001D6F4) TCustomScpExplorerForm::ShowExtendedException
(00097969) TTerminalManager::TerminalShowExtendedException
(007B94BC) TTerminal::ShowExtendedException
(0021F91E) Vcl::Forms::TApplication::HandleException
(00380D20) System::Classes::_18201
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

(00363C9D) System::Classes::TList::Get
(00363C9D) System::Classes::TList::Get
(00095C9F) TTerminalManager::FreeActiveTerminal
(000A4DE5) ShowExtendedExceptionEx
(0001D6F4) TCustomScpExplorerForm::ShowExtendedException
(00097969) TTerminalManager::TerminalShowExtendedException
(007B94BC) TTerminal::ShowExtendedException
(0021F91E) Vcl::Forms::TApplication::HandleException
(00380D20) System::Classes::_18201
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

(003F24CC) System::HandleAnyException
(0007DAFF) ntdll.dll
(0006B711) ntdll.dll.KiUserExceptionDispatcher
(00380D20) System::Classes::_18201
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) 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 5.13.3

Error message:
Invalid access to memory.

Stack trace:
(0001ABA6)
(008BCA5A)
(008BEAC2)
(008BB87C)
(0007DAFF) ntdll.dll
(0006B711) ntdll.dll.KiUserExceptionDispatcher
(0004265F)
(00005E00)
(00095F83)
(00095F0E)
(00095433)
(00095C22)
(000A4579)
(0001D6F4)
(00097121)
(007B8328)
(0021EF6E)
(00380370)
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

(00095D16)
(0007DAFF) ntdll.dll
(0006B711) ntdll.dll.KiUserExceptionDispatcher
(00095433)
(000A4579)
(0001D6F4)
(00097121)
(007B8328)
(0021EF6E)
(00380370)
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

(003632ED)
(003632ED)
(00095433)
(000A4579)
(0001D6F4)
(00097121)
(007B8328)
(0021EF6E)
(00380370)
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

(003F1B1C)
(0007DAFF) ntdll.dll
(0006B711) ntdll.dll.KiUserExceptionDispatcher
(00380370)
(0003AE69) USER32.dll
(00037335) USER32.dll
(00036BE9) USER32.dll
(000369CB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.

This happens when cancelling an auto re-login process after a timeout on GoAnywhere FTP connections.

<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:
Invalid access to memory.

Stack trace:
(0001ABA6) TCustomScpExplorerForm::UpdateTerminal
(008BDC8E) C5104_3
(008BFCF6) ____ExceptionHandler
(008BCAB0) __ExceptionHandler
(0007E16F) ntdll.dll
(0006BD81) ntdll.dll.KiUserExceptionDispatcher
(0004265F) TScpCommanderForm::UpdateTerminal
(00005E00) TCustomScpExplorerForm::TerminalChanging
(00098F29) TTerminalManager::TerminalReady
(00096756) TTerminalManager::SetActiveTerminal
(00095C9F) TTerminalManager::FreeActiveTerminal
(0009646A) TTerminalManager::ReconnectActiveTerminal
(000A4DE5) ShowExtendedExceptionEx
(0001D6F4) TCustomScpExplorerForm::ShowExtendedException
(00097969) TTerminalManager::TerminalShowExtendedException
(007B94BC) TTerminal::ShowExtendedException
(0021F91E) Vcl::Forms::TApplication::HandleException
(00380D20) System::Classes::_18201
(0003AF19) USER32.dll
(000373E5) USER32.dll
(00036C99) USER32.dll
(00036A7B) USER32.dll.DispatchMessageW

(007BAAE5) TTerminal::TranslateLockedPath
(0007E16F) ntdll.dll
(0006BD81) ntdll.dll.KiUserExceptionDispatcher
(007BB288) TTerminal::PeekCurrentDirectory
(0001AC21) TCustomScpExplorerForm::UpdateSessionData
(000426F7) TScpCommanderForm::UpdateSessionData
(0001ABD9) TCustomScpExplorerForm::UpdateTerminal
(0004265F) TScpCommanderForm::UpdateTerminal
(00005E00) TCustomScpExplorerForm::TerminalChanging
(00098F29) TTerminalManager::TerminalReady
(00096756) TTerminalManager::SetActiveTerminal
(00095C9F) TTerminalManager::FreeActiveTerminal
(000A4DE5) ShowExtendedExceptionEx
(0001D6F4) TCustomScpExplorerForm::ShowExtendedException
(00097969) TTerminalManager::TerminalShowExtendedException
(007B94BC) TTerminal::ShowExtendedException
(0021F91E) Vcl::Forms::TApplication::HandleException
(00380D20) System::Classes::_18201
(0003AF19) USER32.dll
(000373E5) USER32.dll
(00036C99) USER32.dll
(00036A7B) USER32.dll.DispatchMessageW

(003F24CC) System::HandleAnyException
(0007E16F) ntdll.dll
(0006BD81) ntdll.dll.KiUserExceptionDispatcher
(00380D20) System::Classes::_18201
(0003AF19) USER32.dll
(000373E5) USER32.dll
(00036C99) USER32.dll
(00036A7B) 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.