Invalid access to memory - _bufchain_consume

<In this particular instance I was just uploading three small files (in the background) from my local machine to the remote server. Lately I have also been having this error a lot upon connection to the remote server. Rebooting WinSCP (sometimes multiples times) usually does the trick. I am using pageant with an ssh-rsa key in the background. Ethernet connection is fairly good. My connection happens through a proxy with local command
, in which the password I use is stored in the Advanced Site Settings. Note that in this case after clicking OK on the dialog box my three files had been transferred all right.>

WinSCP 5.13

Error message:
Invalid access to memory.

Stack trace:
(00638F44) _bufchain_consume
(008B9FD2) C5101_3
(008BC03A) ____ExceptionHandler
(008B8DF4) __ExceptionHandler
(00088D1F) ntdll.dll
(0006FC11) ntdll.dll.KiUserExceptionDispatcher
(00647EA4) _ssh_agent_forwarding_permitted
(00647EFE) _ssh_agent_forwarding_permitted
(006483EE) _ssh_agent_forwarding_permitted
(0064D39F) _sshfwd_x11_is_local
(006405BA) C2481_0
(0064076D) C2481_0
(00640A88) _ssh_connshare_log
(0066CED9) C2535_0
(0066CDA6) _handle_got_event
(007363D3) TSecureShell::EventSelectLoop
(00736919) TSecureShell::Idle
(007B19C3) TTerminal::Idle
(00097D3C) TTerminalManager::Idle
(00017543) TCustomScpExplorerForm::Idle
(0003DFD7) TNonVisualDataModule::DoIdle
(0003DF94) TNonVisualDataModule::SessionIdleTimerTimer
(0037ED14) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(008BA63D) C5101_3
(008BBC17) _ReThrowException
(00097D81) TTerminalManager::Idle
(00017543) TCustomScpExplorerForm::Idle
(0003DFD7) TNonVisualDataModule::DoIdle
(0003DF94) TNonVisualDataModule::SessionIdleTimerTimer
(0037ED14) 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.

This bug has been added to the tracker:
https://winscp.net/tracker/1623

<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 5.13.2

Error message:
Invalid access to memory.

Stack trace:
(0063B038) _bufchain_consume
(008BC642) C5104_0
(008BE6AA) ____ExceptionHandler
(008BB464) __ExceptionHandler
(00088D2F) ntdll.dll
(0006FBF1) ntdll.dll.KiUserExceptionDispatcher
(00649F98) _ssh_agent_forwarding_permitted
(00649FF2) _ssh_agent_forwarding_permitted
(0064A4E2) _ssh_agent_forwarding_permitted
(0064F493) _sshfwd_x11_is_local
(006426AE) C2484_0
(00642861) C2484_0
(00642B7C) _ssh_connshare_log
(0066EFCD) C2538_0
(0066EE9A) _handle_got_event
(0073860B) TSecureShell::EventSelectLoop
(00738B51) TSecureShell::Idle
(007B3DCF) TTerminal::Idle
(00098FE8) TTerminalManager::Idle
(000175BF) TCustomScpExplorerForm::Idle
(0003EDA3) TNonVisualDataModule::DoIdle
(0003ED60) TNonVisualDataModule::SessionIdleTimerTimer
(0038022C) System::Classes::_18201
(0001D0B9) USER32.dll
(00027844) USER32.dll
(0002A140) USER32.dll
(000180D7) USER32.dll
(00017C1B) USER32.dll.DispatchMessageW

(008BCCAD) C5104_0
(008BE287) _ReThrowException
(0009902D) TTerminalManager::Idle
(000175BF) TCustomScpExplorerForm::Idle
(0003EDA3) TNonVisualDataModule::DoIdle
(0003ED60) TNonVisualDataModule::SessionIdleTimerTimer
(0038022C) 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.

<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:
(0063B17C) _bufchain_consume
(008BCA5A) C5104_0
(008BEAC2) ____ExceptionHandler
(008BB87C) __ExceptionHandler
(0003EF0E) ntdll.dll.ZwWow64CallFunction64
(0003F68A) ntdll.dll.KiUserExceptionDispatcher
(0064A0DC) _ssh_agent_forwarding_permitted
(0064A136) _ssh_agent_forwarding_permitted
(0064A626) _ssh_agent_forwarding_permitted
(0064F5D7) _sshfwd_x11_is_local
(006427F2) C2484_0
(006429A5) C2484_0
(00642CC0) _ssh_connshare_log
(0066F111) C2538_0
(0066EFDE) _handle_got_event
(007387CB) TSecureShell::EventSelectLoop
(00738D11) TSecureShell::Idle
(007B3F7F) TTerminal::Idle
(000990CC) TTerminalManager::Idle
(000175BF) TCustomScpExplorerForm::Idle
(0003EDF7) TNonVisualDataModule::DoIdle
(0003EDB4) TNonVisualDataModule::SessionIdleTimerTimer
(00380370) System::Classes::_18201
(00007E6F) USER32.DLL.CallNextHookEx
(000080CC) USER32.DLL
(0000966A) USER32.DLL
(000096DB) USER32.DLL.DispatchMessageW

(008BD0C5) C5104_0
(008BE69F) _ReThrowException
(00099111) TTerminalManager::Idle
(000175BF) TCustomScpExplorerForm::Idle
(0003EDF7) TNonVisualDataModule::DoIdle
(0003EDB4) TNonVisualDataModule::SessionIdleTimerTimer
(00380370) System::Classes::_18201
(00007E6F) USER32.DLL.CallNextHookEx
(000080CC) USER32.DLL
(0000966A) USER32.DLL
(000096DB) 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.

<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 5.15.2

Error message:
Invalid access to memory.

Stack trace:
(00690250) _bufchain_consume
(0092709A) C5157_3
(00929102) ____ExceptionHandler
(00925EBC) __ExceptionHandler
(0007E19F) ntdll.dll
(0006BD81) ntdll.dll.KiUserExceptionDispatcher
(0069F1EC) _ssh_agent_forwarding_permitted
(0069F246) _ssh_agent_forwarding_permitted
(0069F736) _ssh_agent_forwarding_permitted
(006A46E7) _sshfwd_x11_is_local
(006978C6) C2539_0
(00697A79) C2539_0
(00697D94) _ssh_connshare_log
(006C4269) C2593_0
(006C4136) _handle_got_event
(0079526B) TSecureShell::EventSelectLoop
(0079449B) TSecureShell::WaitForData
(0078F511) TSecureShell::Init
(0078EE6E) TSecureShell::Open
(008131D9) TTerminal::Open
(0074BA60) TTerminalItem::ProcessEvent
(00749E2C) TSignalThread::Execute
(000BB3EF) Userinterface::C20_0
(00017492) KERNEL32.DLL.BaseThreadInitThunk
(000631C6) ntdll.dll.RtlAreBitsSet
(00063193) ntdll.dll.RtlAreBitsSet

(00927705) C5157_3
(00928CDF) _ReThrowException
(0078F61F) TSecureShell::Init
(0078EE6E) TSecureShell::Open
(008131D9) TTerminal::Open
(0074BA60) TTerminalItem::ProcessEvent
(00749E2C) TSignalThread::Execute
(000BB3EF) Userinterface::C20_0
(00017492) KERNEL32.DLL.BaseThreadInitThunk
(000631C6) ntdll.dll.RtlAreBitsSet
(00063193) ntdll.dll.RtlAreBitsSet

(00927705) C5157_3
(00928CDF) _ReThrowException
(0078F6BA) TSecureShell::Init
(0078EE6E) TSecureShell::Open
(008131D9) TTerminal::Open
(0074BA60) TTerminalItem::ProcessEvent
(00749E2C) TSignalThread::Execute
(000BB3EF) Userinterface::C20_0
(00017492) KERNEL32.DLL.BaseThreadInitThunk
(000631C6) ntdll.dll.RtlAreBitsSet
(00063193) ntdll.dll.RtlAreBitsSet

(00927705) C5157_3
(00928CDF) _ReThrowException
(0078EF5C) TSecureShell::Open
(008131D9) TTerminal::Open
(0074BA60) TTerminalItem::ProcessEvent
(00749E2C) TSignalThread::Execute
(000BB3EF) Userinterface::C20_0
(00017492) KERNEL32.DLL.BaseThreadInitThunk
(000631C6) ntdll.dll.RtlAreBitsSet
(00063193) ntdll.dll.RtlAreBitsSet

(00927705) C5157_3
(00928CDF) _ReThrowException
(0081333E) TTerminal::Open
(0074BA60) TTerminalItem::ProcessEvent
(00749E2C) TSignalThread::Execute
(000BB3EF) Userinterface::C20_0
(00017492) KERNEL32.DLL.BaseThreadInitThunk
(000631C6) ntdll.dll.RtlAreBitsSet
(00063193) ntdll.dll.RtlAreBitsSet

(00927705) C5157_3
(00928CDF) _ReThrowException
(0081390D) TTerminal::Open
(0074BA60) TTerminalItem::ProcessEvent
(00749E2C) TSignalThread::Execute
(000BB3EF) Userinterface::C20_0
(00017492) KERNEL32.DLL.BaseThreadInitThunk
(000631C6) ntdll.dll.RtlAreBitsSet
(00063193) ntdll.dll.RtlAreBitsSet

The problem happens rarely. I cannot reproduce it.

Trying to upload a lot of data

WinSCP 5.15.5

Error message:
Invalid access to memory.

Stack trace:
(00691220) _bufchain_consume
(0092827A) C5157_3
(0092A2E2) ____ExceptionHandler
(0092709C) __ExceptionHandler
(00089BEF) ntdll.dll
(00070AB1) ntdll.dll.KiUserExceptionDispatcher
(006A01CC) _ssh_agent_forwarding_permitted
(006A0226) _ssh_agent_forwarding_permitted
(006A0716) _ssh_agent_forwarding_permitted
(006A56C7) _sshfwd_x11_is_local
(00698896) C2539_0
(00698A49) C2539_0
(00698D64) _ssh_connshare_log
(006C5249) C2593_0
(006C5116) _handle_got_event
(007963AB) TSecureShell::EventSelectLoop
(007968F1) TSecureShell::Idle
(008133DB) TTerminal::Idle
(000AEB6C) TTerminalManager::Idle
(00018862) TCustomScpExplorerForm::Idle
(000482C7) TNonVisualDataModule::DoIdle
(00048284) TNonVisualDataModule::SessionIdleTimerTimer
(003A3E44) System::Classes::_18201
(0001D459) USER32.dll
(00027C04) USER32.dll
(0002A533) USER32.dll
(00018467) USER32.dll
(00017FAB) USER32.dll.DispatchMessageW

(009288E5) C5157_3
(00929EBF) _ReThrowException
(000AEBB1) TTerminalManager::Idle
(00018862) TCustomScpExplorerForm::Idle
(000482C7) TNonVisualDataModule::DoIdle
(00048284) TNonVisualDataModule::SessionIdleTimerTimer
(003A3E44) System::Classes::_18201
(0001D459) USER32.dll
(00027C04) USER32.dll
(0002A533) USER32.dll
(00018467) USER32.dll
(00017FAB) 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.