Crash on file transfer

[azzytee]

Seemingly randomly, but reoccouring. FileZilla
crashes on a large file transfer.

Crashes with the following information:

Socket Notification Sink: FileZilla.exe - Application
Error

The instruction at "0x73dd3eb8" referenced memory
at "0x00000000". The memory could not be "read".

Click on OK to terminate the program
Click on CANCEL to debug the program

When clicked debug, I receive

Microsoft Visual C++

Unhandled exception in FileZilla.exe (MFC42.DLL);
0xC0000005: Access Violation.

And the following line is marked
73DDD3EB8 mov eax,dword ptr [edi]

As for system information, I'm running a Pentium 4
1.4ghz with 768 megs of ram, plenty of disk space (no
low disk space problems), WindowsXP, LAN connected to
DSL via a Microsoft SOCKS4 proxy.

Thanks for the great ftp client, keep up the good
work.

[azzytee]

Screenshot of MSVC++ in debug.

[Tim Kosse]

Could you please try to compile a debug version of
FileZilla and run it inside the debugger?
If it crashes again, please send me the contents of the
call stack (press ALT+7 to show it).
Then I should be able to locate the error.

[azzytee]

OK, I will try to do this tomorrow. Although I know very
little about VC++ (or C++ for that matter), Just have
Visual Studio installed for VB.

The crash happened very frequently, and didn't seem to
only be on large files, so I'm sure I can reproduce it. I
ended up going back to 1.7b and haven't had any problems
(if I recall correctly), but with both of the 1.8x
releases I had this crash.

[Tim Kosse]

You could also try the following:
In the settiings dialog go to the debug page and
enable "Trace messages from the ftp engine" and "Log to
File" (enter a valid filename) Then connect to a server and
transfer some files. When FileZilla crashes, please post
the log file.
Using the log you can see which functions have been called
beforce the crash.

[azzytee]

VC++ call stack crash stuff

[azzytee]

Damn! It took 3 hours before crashing today, yesterday it
was only a half hour or so. But it finally crashed when
in debug mode. I don't understand the output, but I hope
it helps.

<BEGIN CALL STACK>

CString::GetData() line 122 + 13 bytes
CString::CString(const CString & {???}) line 53 + 8 bytes
t_server::t_server(const t_server & {...}) + 62 bytes
CDirectoryCache::Purge(const CServerPath & {...}, const
t_server * 0x00000000) line 248 + 27 bytes
CDirectoryCache::Lookup(const CServerPath & {...},
t_server {...}, t_directory & {...}) line 67
CControlSocket::FileTransfer(t_transferfile * 0x00000000,
int 0, int 0) line 1743 + 60 bytes
CControlSocket::ProcessReply() line 380
CMainThread::PreTranslateMessage(tagMSG * 0x00544cc8
{msg=0x0000c238 wp=0x00000000 lp=0x00000000}) line 185
CWinThread::PumpMessage() line 841 + 30 bytes
CWinThread::Run() line 480 + 11 bytes
_AfxThreadEntry(void * 0x0012f230) line 125 + 11 bytes
_threadstartex(void * 0x005439f0) line 212 + 13 bytes
KERNEL32! 77e802ed()

<END CALL STACK>

I've attached a screenshot of the call stack window and
the VC++ window. I will try the Trace messages option and
next time it crashes post that, if neccessary.

Thank you!

[Tim Kosse]

I've found the bug. After reaching the maximum time a
directory is stored in the dircache, it will be removed the
cache (CDirectoryCache::Purge)
This function was called with the wrong parameters given
and could also crash when a root directory gets purged.
The fixed version will be released in one or two days,
until then I suggest you to increase the maximum cache time
to 999 hours.