Invalid access to memory - _search234_step

I locked my screen, came back and connected back to VPN. WinSCP had three sessions open, two needed to reconnect (normal behaviour after reconnecting to VPN). First session reconnected fine, but the second one produced this pop up non stop. I was getting maybe one pop up a second stacking up.
Had to end task to close WinSCP completely.

WinSCP 5.17.7

Error message:
Invalid access to memory.

Stack trace:
(00C2A328) _search234_step
(00F8862A) C5296_3
(00F8A692) ____ExceptionHandler
(00F8744C) __ExceptionHandler
(0008403F) ntdll.dll
(00071941) ntdll.dll.KiUserExceptionDispatcher
(00C2A6A6) _del234
(00C2F7E9) _sk_newlistener
(00BE24FC) _ssh_conn_processed_data
(00BE2E08) _ssh_throttle_conn
(00D067D1) TSecureShell::FreeBackend
(00D511FF) TSFTPFileSystem::Close
(00D05EFA) TSecureShell::FatalError
(00D07A75) TSecureShell::EventSelectLoop
(00D08541) TSecureShell::Idle
(00D8893B) TTerminal::Idle
(000AF6A9) TTerminalManager::Idle
(00018C91) TCustomScpExplorerForm::Idle
(00049B17) TNonVisualDataModule::DoIdle
(00049AD4) TNonVisualDataModule::SessionIdleTimerTimer
(003A4BA8) System::Classes::_18201
(00044CA9) USER32.dll
(000357B7) USER32.dll
(000348F6) USER32.dll
(000346CB) USER32.dll.DispatchMessageW

(00F88C95) C5296_3
(00F8A26F) _ReThrowException
(000AF6EE) TTerminalManager::Idle
(00018C91) TCustomScpExplorerForm::Idle
(00049B17) TNonVisualDataModule::DoIdle
(00049AD4) TNonVisualDataModule::SessionIdleTimerTimer
(003A4BA8) System::Classes::_18201
(00044CA9) USER32.dll
(000357B7) USER32.dll
(000348F6) USER32.dll
(000346CB) 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.)>
Hi,
PC left alone about 30 mins, and when back, found this error. Never had a crash before with WinScp.
Windows 10
opened at the same time : PhpStorm - Chrome (x3 tabs) - Opera (x2 tabs) - HeidiSql
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.17.8

Error message:
Accès mémoire invalide.

Trace de la pile :
(00C2BF89) _search234_step
(00F89E6E) C5296_0
(00F8BED6) ____ExceptionHandler
(00F88C90) __ExceptionHandler
(000861AF) ntdll.dll
(00072B31) ntdll.dll.KiUserExceptionDispatcher
(00C2C0E6) _del234
(00C31229) _sk_newlistener
(00BE3F3C) _ssh_conn_processed_data
(00BE4848) _ssh_throttle_conn
(00D08089) TSecureShell::FreeBackend
(00D0806B) TSecureShell::SetActive
(00D8CA4D) TTerminal::CloseTunnel
(00D8CB35) TTerminal::Closed
(00D08163) TSecureShell::Discard
(00C3123B) _sk_newlistener
(00BE3F3C) _ssh_conn_processed_data
(00BE3FDC) _ssh_remote_error
(00BEB568) _ssh2_bpp_rekey_inadvisable
(00C013ED) _ssh_ppl_user_output_string_and_free
(00BCF7EA) C2603_0
(00BCF8DD) _run_toplevel_callbacks
(00D09790) TSecureShell::EventSelectLoop
(00D09DF9) TSecureShell::Idle
(00D8A153) TTerminal::Idle
(000AF821) TTerminalManager::Idle
(00018C91) TCustomScpExplorerForm::Idle
(00049B2B) TNonVisualDataModule::DoIdle
(00049AE8) TNonVisualDataModule::SessionIdleTimerTimer
(003A58C4) System::Classes::_18201
(0003DF59) USER32.dll
(00034ED5) USER32.dll
(00032C45) USER32.dll
(00032A0B) USER32.dll.DispatchMessageW

(00F8A4D9) C5296_0
(00F8BAB3) _ReThrowException
(000AF866) TTerminalManager::Idle
(00018C91) TCustomScpExplorerForm::Idle
(00049B2B) TNonVisualDataModule::DoIdle
(00049AE8) TNonVisualDataModule::SessionIdleTimerTimer
(003A58C4) System::Classes::_18201
(0003DF59) USER32.dll
(00034ED5) USER32.dll
(00032C45) USER32.dll
(00032A0B) 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)>

i have no idea what happened. my sessions had been open for a few days and then randomly i got this error. i was doing something else at the time, and my sessions were just sitting in the background.



WinSCP 5.19.4

Error message:
Invalid access to memory.

Stack trace:
(00C5B837) _search234_step
(00FC3FFE) C5294_3
(00FC6066) ____ExceptionHandler
(00FC2E20) __ExceptionHandler
(000878AF) ntdll.dll
(00073EE1) ntdll.dll.KiUserExceptionDispatcher
(00C5B9DE) _del234
(00C60D7D) _sk_newlistener
(00C0F3E0) _ssh_conn_processed_data
(00C0F484) _ssh_remote_error
(00C16A81) _ssh2_bpp_rekey_inadvisable
(00C30B99) _ssh_ppl_default_queued_data_size
(00BFAA12) C2597_0
(00BFAB05) _run_toplevel_callbacks
(00D3CDF8) TSecureShell::EventSelectLoop
(00D3D461) TSecureShell::Idle
(00DC0D3F) TTerminal::Idle
(000B3EC5) TTerminalManager::Idle
(000190ED) TCustomScpExplorerForm::Idle
(0004CA83) TNonVisualDataModule::DoIdle
(0004CA40) TNonVisualDataModule::SessionIdleTimerTimer
(003C7A98) System::Classes::_18201
(00042489) USER32.dll
(00039425) USER32.dll
(00037195) USER32.dll
(00036F5B) USER32.dll.DispatchMessageW

(00C5B5B3) _search234_step
(00FC3FFE) C5294_3
(00FC6066) ____ExceptionHandler
(00FC2E20) __ExceptionHandler
(000878AF) ntdll.dll
(00073EE1) ntdll.dll.KiUserExceptionDispatcher
(00C5B9DE) _del234
(00C60D7D) _sk_newlistener
(00C0F3E0) _ssh_conn_processed_data
(00C0F484) _ssh_remote_error
(00C16A81) _ssh2_bpp_rekey_inadvisable
(00C30B99) _ssh_ppl_default_queued_data_size
(00BFAA12) C2597_0
(00BFAB05) _run_toplevel_callbacks
(00D3CDF8) TSecureShell::EventSelectLoop
(00D3D461) TSecureShell::Idle
(00DC0D3F) TTerminal::Idle
(00CF3B6F) TTerminalItem::Idle
(00CF2EF7) TTerminalQueue::Idle
(000B3EEE) TTerminalManager::Idle
(000190ED) TCustomScpExplorerForm::Idle
(0004CA83) TNonVisualDataModule::DoIdle
(0004CA40) TNonVisualDataModule::SessionIdleTimerTimer
(003C7A98) System::Classes::_18201
(00042489) USER32.dll
(00039425) USER32.dll
(00037195) USER32.dll
(00036F5B) USER32.dll.DispatchMessageW

(00C5B837) _search234_step
(00FC3FFE) C5294_3
(00FC6066) ____ExceptionHandler
(00FC2E20) __ExceptionHandler
(000878AF) ntdll.dll
(00073EE1) ntdll.dll.KiUserExceptionDispatcher
(00C5B9DE) _del234
(00C60D7D) _sk_newlistener
(00C0F3E0) _ssh_conn_processed_data
(00C0FCF8) _ssh_throttle_conn
(00D3B6ED) TSecureShell::FreeBackend
(00D8918B) TSFTPFileSystem::Close
(00D3AE16) TSecureShell::FatalError
(00D3C995) TSecureShell::EventSelectLoop
(00D3D461) TSecureShell::Idle
(00DC0D3F) TTerminal::Idle
(000B3EC5) TTerminalManager::Idle
(000190ED) TCustomScpExplorerForm::Idle
(0004CA83) TNonVisualDataModule::DoIdle
(0004CA40) TNonVisualDataModule::SessionIdleTimerTimer
(003C7A98) System::Classes::_18201
(00042489) USER32.dll
(00039425) USER32.dll
(00037195) USER32.dll
(00036F5B) USER32.dll.DispatchMessageW

(00C5B837) _search234_step
(00FC3FFE) C5294_3
(00FC6066) ____ExceptionHandler
(00FC2E20) __ExceptionHandler
(000878AF) ntdll.dll
(00073EE1) ntdll.dll.KiUserExceptionDispatcher
(00C5B9DE) _del234
(00C60D7D) _sk_newlistener
(00C0F3E0) _ssh_conn_processed_data
(00C0FCF8) _ssh_throttle_conn
(00D3B6E

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 5.21.5

Error message:
Error listing directory '/home/AutoBackup'.

Invalid access to memory.

Stack trace:
(00C6974A) _search234_step
(00FDC86E) C5412_0
(00FDE8D6) ____ExceptionHandler
(00FDB690) __ExceptionHandler
(00087B7F) ntdll.dll
(00074001) ntdll.dll.KiUserExceptionDispatcher
(00C69926) _del234
(00C6E1B5) _sk_newlistener
(00C566C0) _ssh_conn_processed_data
(00C57110) _ssh_is_bare
(00D4EEA6) TSecureShell::FreeBackend
(00D9E637) TSFTPFileSystem::Close
(00D4E5BE) TSecureShell::FatalError
(00D4F343) TSecureShell::CheckConnection
(00D4D683) TSecureShell::Send
(00D9FDC5) TSFTPFileSystem::SendPacket
(00DA3DC8) TSFTPFileSystem::SendPacketAndReceiveResponse
(00DB35AB) TSFTPFileSystem::ReadDirectory
(00DE1DB8) TTerminal::CustomReadDirectory
(00DE1121) TTerminal::ReadDirectory
(00DDEABD) TTerminal::DoEndTransaction
(00DDE98E) TTerminal::EndTransaction
(00D05A71) TDownloadQueueItem::DoTransferExecute
(00D03D9A) TQueueItem::Execute
(00D02DCA) TTerminalItem::ProcessEvent
(00D01110) TSignalThread::Execute
(000C27FB) Userinterface::C20_0
(0001EEF7) KERNEL32.DLL.BaseThreadInitThunk
(00066BBC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066B89) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00FDCED9) C5412_0
(00FDE4B3) _ReThrowException
(00DB363F) TSFTPFileSystem::ReadDirectory
(00DE1DB8) TTerminal::CustomReadDirectory
(00DE1121) TTerminal::ReadDirectory
(00DDEABD) TTerminal::DoEndTransaction
(00DDE98E) TTerminal::EndTransaction
(00D05A71) TDownloadQueueItem::DoTransferExecute
(00D03D9A) TQueueItem::Execute
(00D02DCA) TTerminalItem::ProcessEvent
(00D01110) TSignalThread::Execute
(000C27FB) Userinterface::C20_0
(0001EEF7) KERNEL32.DLL.BaseThreadInitThunk
(00066BBC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066B89) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00FDCED9) C5412_0
(00FDE4B3) _ReThrowException
(00DE1DE7) TTerminal::CustomReadDirectory
(00DE1121) TTerminal::ReadDirectory
(00DDEABD) TTerminal::DoEndTransaction
(00DDE98E) TTerminal::EndTransaction
(00D05A71) TDownloadQueueItem::DoTransferExecute
(00D03D9A) TQueueItem::Execute
(00D02DCA) TTerminalItem::ProcessEvent
(00D01110) TSignalThread::Execute
(000C27FB) Userinterface::C20_0
(0001EEF7) KERNEL32.DLL.BaseThreadInitThunk
(00066BBC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066B89) ntdll.dll.RtlGetAppContainerNamedObjectPath

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 5.21.6

Error message:
Invalid access to memory.

Stack trace:
(00C698CE) _search234_step
(00FDF74E) C5412_0
(00FE17B6) ____ExceptionHandler
(00FDE570) __ExceptionHandler
(00087E3F) ntdll.dll
(000732D1) ntdll.dll.KiUserExceptionDispatcher
(00C69AAA) _del234
(00C6E339) _sk_newlistener
(00C56844) _ssh_conn_processed_data
(00C57294) _ssh_is_bare
(00D4F02A) TSecureShell::FreeBackend
(00D9E7BB) TSFTPFileSystem::Close
(00D4E742) TSecureShell::FatalError
(00D4D47B) TSecureShell::TimeoutAbort
(00D4F778) TSecureShell::WaitForData
(00D4A1E1) TSecureShell::Init
(00D49B20) TSecureShell::Open
(00D9E7AF) TSFTPFileSystem::Open
(00DDA663) TTerminal::Reopen
(00DDCD31) TTerminal::QueryReopen
(00DD202C) TRobustOperationLoop::TryReopen
(00DF5A31) TTerminal::SourceRobust
(00DF5849) TTerminal::DoCopyToRemote
(00DC1FFE) TSFTPFileSystem::CopyToRemote
(00DF456C) TTerminal::CopyToParallel
(00D0558B) TParallelTransferQueueItem::DoExecute
(00D03F1E) TQueueItem::Execute
(00D02F4E) TTerminalItem::ProcessEvent
(00D01294) TSignalThread::Execute
(000C2803) Userinterface::C20_0
(00015357) KERNEL32.DLL.BaseThreadInitThunk
(00066C22) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066BEF) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00FDFDB9) C5412_0
(00FE1393) _ReThrowException
(00D4A2F3) TSecureShell::Init
(00D49B20) TSecureShell::Open
(00D9E7AF) TSFTPFileSystem::Open
(00DDA663) TTerminal::Reopen
(00DDCD31) TTerminal::QueryReopen
(00DD202C) TRobustOperationLoop::TryReopen
(00DF5A31) TTerminal::SourceRobust
(00DF5849) TTerminal::DoCopyToRemote
(00DC1FFE) TSFTPFileSystem::CopyToRemote
(00DF456C) TTerminal::CopyToParallel
(00D0558B) TParallelTransferQueueItem::DoExecute
(00D03F1E) TQueueItem::Execute
(00D02F4E) TTerminalItem::ProcessEvent
(00D01294) TSignalThread::Execute
(000C2803) Userinterface::C20_0
(00015357) KERNEL32.DLL.BaseThreadInitThunk
(00066C22) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066BEF) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00C698CE) _search234_step
(00FDF74E) C5412_0
(00FE17B6) ____ExceptionHandler
(00FDE570) __ExceptionHandler
(00087E3F) ntdll.dll
(000732D1) ntdll.dll.KiUserExceptionDispatcher
(00C69AAA) _del234
(00C6E339) _sk_newlistener
(00C56844) _ssh_conn_processed_data
(00C57294) _ssh_is_bare
(00D4F02A) TSecureShell::FreeBackend
(00D9E7BB) TSFTPFileSystem::Close
(00D4A363) TSecureShell::Init
(00D49B20) TSecureShell::Open
(00D9E7AF) TSFTPFileSystem::Open
(00DDA663) TTerminal::Reopen
(00DDCD31) TTerminal::QueryReopen
(00DD202C) TRobustOperationLoop::TryReopen
(00DF5A31) TTerminal::SourceRobust
(00DF5849) TTerminal::DoCopyToRemote
(00DC1FFE) TSFTPFileSystem::CopyToRemote
(00DF456C) TTerminal::CopyToParallel
(00D0558B) TParallelTransferQueueItem::DoExecute
(00D03F1E) TQueueItem::Execute
(00D02F4E) TTerminalItem::ProcessEvent
(00D01294) TSignalThread::Execute
(000C2803) Userinterface::C20_0
(00015357) KERNEL32.DLL.BaseThreadInitThunk
(00066C22) ntdll

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 5.21.5

Error message:
Érvénytelen memóriaelérés

Veremkivonat:
(00C6974A) _search234_step
(00FDC86E) C5412_0
(00FDE8D6) ____ExceptionHandler
(00FDB690) __ExceptionHandler
(00087B7F) ntdll.dll
(00074001) ntdll.dll.KiUserExceptionDispatcher
(00C69926) _del234
(00C6E1B5) _sk_newlistener
(00C566C0) _ssh_conn_processed_data
(00C56770) _ssh_remote_error
(00C48C72) _ssh2_bpp_rekey_inadvisable
(00C4AA35) _ssh_ppl_new_prompts
(00C0A02A) C2593_0
(00C0A11D) _run_toplevel_callbacks
(00D502AA) TSecureShell::EventSelectLoop
(00D4F50F) TSecureShell::WaitForData
(00D4A05D) TSecureShell::Init
(00D4999C) TSecureShell::Open
(00D9E62B) TSFTPFileSystem::Open
(00DDA4DF) TTerminal::Reopen
(00DDCBAD) TTerminal::QueryReopen
(00DD1EA8) TRobustOperationLoop::TryReopen
(00DF7D6E) TTerminal::SinkRobust
(00DF7B2C) TTerminal::DoCopyToLocal
(00DC8D8E) TSFTPFileSystem::CopyToLocal
(00DF4417) TTerminal::CopyToParallel
(00D05407) TParallelTransferQueueItem::DoExecute
(00D03D9A) TQueueItem::Execute
(00D02DCA) TTerminalItem::ProcessEvent
(00D01110) TSignalThread::Execute
(000C27FB) Userinterface::C20_0
(0001F0F7) KERNEL32.DLL.BaseThreadInitThunk
(00066BBC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066B89) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00FDCED9) C5412_0
(00FDE4B3) _ReThrowException
(00D4A16F) TSecureShell::Init
(00D4999C) TSecureShell::Open
(00D9E62B) TSFTPFileSystem::Open
(00DDA4DF) TTerminal::Reopen
(00DDCBAD) TTerminal::QueryReopen
(00DD1EA8) TRobustOperationLoop::TryReopen
(00DF7D6E) TTerminal::SinkRobust
(00DF7B2C) TTerminal::DoCopyToLocal
(00DC8D8E) TSFTPFileSystem::CopyToLocal
(00DF4417) TTerminal::CopyToParallel
(00D05407) TParallelTransferQueueItem::DoExecute
(00D03D9A) TQueueItem::Execute
(00D02DCA) TTerminalItem::ProcessEvent
(00D01110) TSignalThread::Execute
(000C27FB) Userinterface::C20_0
(0001F0F7) KERNEL32.DLL.BaseThreadInitThunk
(00066BBC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066B89) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00FDCED9) C5412_0
(00FDE4B3) _ReThrowException
(00D4A20A) TSecureShell::Init
(00D4999C) TSecureShell::Open
(00D9E62B) TSFTPFileSystem::Open
(00DDA4DF) TTerminal::Reopen
(00DDCBAD) TTerminal::QueryReopen
(00DD1EA8) TRobustOperationLoop::TryReopen
(00DF7D6E) TTerminal::SinkRobust
(00DF7B2C) TTerminal::DoCopyToLocal
(00DC8D8E) TSFTPFileSystem::CopyToLocal
(00DF4417) TTerminal::CopyToParallel
(00D05407) TParallelTransferQueueItem::DoExecute
(00D03D9A) TQueueItem::Execute
(00D02DCA) TTerminalItem::ProcessEvent
(00D01110) TSignalThread::Execute
(000C27FB) Userinterface::C20_0
(0001F0F7) KERNEL32.DLL.BaseThreadInitThunk
(00066BBC) ntdll.dll.RtlGetAppContainerNamedObjectPath
(00066B89) ntdll.dll.RtlGetAppContainerNamedObjectPath

(00FDCED9) C5412_0
(00FDE4B3) _ReThrowException
(00D49A8A) TSecureShell::Open
(00D9E62B) TSFTPFileSystem::Open
(00DDA4DF) TTerminal::Reopen
(00DDCBAD) TTerminal::QueryReopen
(00DD1EA8) T

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 6.1.2

Error message:
Invalid access to memory.

Stack trace:
(00C810D1) _search234_step
(01003DEA) C6083_0
(01005E52) ____ExceptionHandler
(01002C0C) __ExceptionHandler
(0009812F) ntdll.dll
(00077D31) ntdll.dll.KiUserExceptionDispatcher
(00C8122E) _del234
(00C85A41) _sk_newlistener_unix
(00C6B52C) _ssh_conn_processed_data
(00C6B5DC) _ssh_remote_error
(00C5C9EA) _ssh2_bpp_rekey_inadvisable
(00C5E825) _ssh_ppl_new_prompts
(00C188BE) C3223_0
(00C189B1) _run_toplevel_callbacks
(00D6BCD7) TSecureShell::EventSelectLoop
(00D6C2C9) TSecureShell::Idle
(00DF5AEF) TTerminal::Idle
(000C1CA9) TTerminalManager::Idle
(0001B8D6) TCustomScpExplorerForm::Idle
(00053267) TNonVisualDataModule::DoIdle
(00053224) TNonVisualDataModule::SessionIdleTimerTimer
(0021564C) System::Classes::_18201
(00031E01) USER32.dll
(00022BE1) USER32.dll
(000214A0) USER32.dll
(00020FEB) USER32.dll.DispatchMessageW

(00C810D1) _search234_step
(01003DEA) C6083_0
(01005E52) ____ExceptionHandler
(01002C0C) __ExceptionHandler
(0009812F) ntdll.dll
(00077D31) ntdll.dll.KiUserExceptionDispatcher
(00C8122E) _del234
(00C85A41) _sk_newlistener_unix
(00C6B52C) _ssh_conn_processed_data
(00C6BF7C) _ssh_is_bare
(00D6A92C) TSecureShell::FreeBackend
(00DBB9BA) TSFTPFileSystem::Close
(00D6A046) TSecureShell::FatalError
(00D6BBC4) TSecureShell::EventSelectLoop
(00D6C2C9) TSecureShell::Idle
(00DF5AEF) TTerminal::Idle
(000C1CA9) TTerminalManager::Idle
(0001B8D6) TCustomScpExplorerForm::Idle
(00053267) TNonVisualDataModule::DoIdle
(00053224) TNonVisualDataModule::SessionIdleTimerTimer
(0021564C) System::Classes::_18201
(00031E01) USER32.dll
(00022BE1) USER32.dll
(000214A0) USER32.dll
(00020FEB) USER32.dll.DispatchMessageW

(00C810D1) _search234_step
(01003DEA) C6083_0
(01005E52) ____ExceptionHandler
(01002C0C) __ExceptionHandler
(0009812F) ntdll.dll
(00077D31) ntdll.dll.KiUserExceptionDispatcher
(00C8122E) _del234
(00C85A41) _sk_newlistener_unix
(00C6B52C) _ssh_conn_processed_data
(00C6BF7C) _ssh_is_bare
(00D6A92C) TSecureShell::FreeBackend
(00DBB9BA) TSFTPFileSystem::Close
(00D6A046) TSecureShell::FatalError
(00D6BBC4) TSecureShell::EventSelectLoop
(00D6C2C9) TSecureShell::Idle
(00DF5AEF) TTerminal::Idle
(000C1CA9) TTerminalManager::Idle
(0001B8D6) TCustomScpExplorerForm::Idle
(00053267) TNonVisualDataModule::DoIdle
(00053224) TNonVisualDataModule::SessionIdleTimerTimer
(0021564C) System::Classes::_18201
(00031E01) USER32.dll
(00022BE1) USER32.dll
(000214A0) USER32.dll
(00020FEB) USER32.dll.DispatchMessageW

(00C810D1) _search234_step
(01003DEA) C6083_0
(01005E52) ____ExceptionHandler
(01002C0C) __ExceptionHandler
(0009812F) ntdll.dll
(00077D31) ntdll.dll.KiUserExceptionDispatcher
(00C8122E) _del234
(00C85A41) _sk_newlistener_unix
(00C6B52C) _ssh_conn_processed_data
(00C6BF7C) _ssh_is_bare
(00D6A92C) TSecureShell::FreeBackend
(00DBB9BA) TSFTPFileSystem::Close
(00D6A046) TSecureShell::FatalErr

The problem happens rarely. I cannot reproduce it.