Error occurred during logging. It's been turned off - TLogForm::LogMemoChange

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

Program keeps crashing

Transfer hangs the crash

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

WinSCP 5.7.6

Error message:
Error occurred during logging. It's been turned off.

Invalid access to memory.

Stack trace:
(0075B3D9) TLogForm::LogMemoChange
(007E46BA) C4799_3
(007E6722) ____ExceptionHandler
(007E369C) __ExceptionHandler
(00041BCE) ntdll.dll.RtlRaiseStatus
(00041A56) ntdll.dll.KiUserExceptionDispatcher
(00610CFE) TLogMemo::SessionLogChange
(0065BD81) TFTPFileSystem::HandleStatus
(0064BD83) TFileZillaImpl::HandleStatus
(00659B5C) TFTPFileSystem::ProcessMessage
(00659D09) TFTPFileSystem::PoolForFatalNonCommandReply
(0064EF75) TFTPFileSystem::Idle
(0070B933) TTerminal::Idle
(00079C0D) TTerminalManager::Idle
(00014C47) TCustomScpExplorerForm::Idle
(000379EB) TNonVisualDataModule::DoIdle
(000367F5) TNonVisualDataModule::ExplorerActionsExecute
(00382320) System::Actions::TContainedActionList::ExecuteAction
(00169E61) Vcl::Actnlist::TCustomAction::Execute
(003402A8) System::Classes::_18201
(000068E5) USER32.DLL
(00006A47) USER32.DLL
(00007D37) USER32.DLL
(0000831E) 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 the report. Will look into it. Meanwhile, please stop using the log window.

Set logging from Normal to Debug 1: worked.
Then set logging from Debug 1 to Debug 2: worked, but WinSCP Windows did not respond to input any more, logging window kept scrolling (lot of) information until the memory error happened.

WinSCP 5.7.7

Error message:
Invalid access to memory.

Stack trace:
(0075BF55) TLogForm::LogMemoChange
(00062496) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(0061204B) TLogMemo::WMLogUpdate
(00612D16) TLogMemo::Dispatch
(0021C609) Vcl::Controls::TWinControl::WndProc
(0021BC50) Vcl::Controls::TWinControl::MainWndProc
(0034059C) System::Classes::_18201
(000152F7) USER32.dll
(00015D35) USER32.dll
(000167CE) USER32.dll
(00016895) 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.

WinSCP now becomes unresponsive as soon as I enable the log window (full or 500 last). Log window stays empty (gray) and I have to force WinSCP to quit (unresponsive).

Set log file to overwrite: didn't help.
Deleted %temp% and started log window before transfers started. Worked, but as soon as transfer stalled WinSCP stalled (full CPU load on one core) and then crashed after 1-2 minutes.

I suspect that the logging window cannot handle the sheer amount of information. I am transferring 350000 files in total and after the crash I restart the transfer with "New and Updated only" option to catch up where the crash stopped.

Thanks for your report. Actually the log window has been removed in the latest release 5.8.4. That kid of resolves this problem.

<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 5.7.7

Error message:
Zugriffsverletzung - ungültiger Zugriff auf den Speicher.

Stack trace:
(0075BF55)
(0008112F) ntdll.dll
(0006ECCA) ntdll.dll.KiUserExceptionDispatcher
(0061204B) @TLogMemo@WMLogUpdate$qr24Winapi@Messages@TMessage
(00612D16) @TLogMemo@Dispatch$qqrpv
(0021C609)
(0021BC50)
(0034059C)
(0002BD41) USER32.dll
(0000DBAA) USER32.dll
(0000D2FF) USER32.dll
(0000D0BB) USER32.dll.DispatchMessageW

The problem happens rarely. I cannot reproduce it.