Missing characters using serial port (reopen).

[Neofit]

Good day, ladies and genlemens.

I collide with issue decribed at https://www.virtualbox.org/ticket/1548.
I use VirtualBox 4.2.6 build 82870 under Xubuntu 12.04 LTS AMD64 for emulate Windows XP prof SP3. Some time ago I see that data received in XP (115200, 8 bit of data, no parity, no flow control, 2 stop bits) from my hardware temporary out of trend. Now I check this ussie.
For tight coverage today I use GtkTerm for send 8k pseudo-random data from Xubuntu (ttyS1) to XP (ttyS0 mirrored to COM1). Normally I use under XP "Br@y terminal" and today I try to use standart Hyperterminal aslo. I use same setting as I use with my hardware. In attaced files you can see outgoing data (noise8k.bin) and differences between reseived and transmitted data (bray.txt, hterm.txt).
As I see - Br@y lost approx. 1k series byte after receive first 1k bytes. Hyperterminal - lost by one byte randomly and swap bytes.

[Neofit]

Outgoing binary data

[Neofit]

Differences when receive by Br@y terminal

[Neofit]

Differences when receive by Hyperterminal

[Neofit]

Session log file

[nothx]

Same problems with 4.2.14 and also with the older build 4.1.26. XP SP3 host on debian jessie, 64 bit.

[aeichner]

Please reopen if still relevant with a recent VirtualBox release.

[PepSek]

This still is a problem while running the latest VirtualBox (5.2.0) under Windows 10 (64bit). I have tracked this issue down and it seems like the last version that the COM ports were working properly was 4.1.44

[Valery Ushakov]

Reopening all related old bugs you can find is not helpful, especially without providing any new information.

See #17239 and its likely duplicate #17227.

[PepSek]

Replying to aeichner:

Please reopen if still relevant with a recent VirtualBox release.

This bug is still relevant with the most recent VirtualBox release, as well as a couple dozen other recent ones.

As I guess tracking it down to the release that broke it isn't "new information".