VirtualBox

Ticket #17239 (new defect)

Opened 21 months ago

Last modified 20 months ago

Serial port missing characters.

Reported by: jim_ Owned by:
Component: uart Version: VirtualBox 5.2.0
Keywords: Cc:
Guest type: Linux Host type: Windows

Description

Using 'Windows 10' as host, and being Linux 'Ubuntu 14.04 LTS' as guest, with Virtual Box 5.2.0 and its associated guest additions, once the guest Ubuntu has been launched, by using the serial port: /dev/ttyS0, from within the guest, some characters are missed (they don't appear in the serialized stream of data shown in the terminal's screen).

This problem is also present in other versions of virtual box (for example: 5.1.18). On the other hand, this issue works fine under Windows 7 as host using virtual box 5.1.18.

¿Perhaps is there some incompatibility between guest additions and windows 10?

Attachments

Ubuntu-2017-11-03-18-33-12.log Download (157.2 KB) - added by jim_ 21 months ago.
VirtualBox logs.
Ubuntu-2017-11-04-09-37-33.log Download (157.1 KB) - added by jim_ 21 months ago.
VirtualBox logs.
Ubuntu-2017-11-04-14-50-28.log Download (111.8 KB) - added by jim_ 21 months ago.
VirtualBox logs.
Ubuntu-2017-11-04-14-59-28.log Download (391.8 KB) - added by jim_ 21 months ago.
VirtualBox logs.
Ubuntu-2017-11-04-15-32-45.log Download (105.8 KB) - added by jim_ 21 months ago.
VirtualBox logs.

Change History

Changed 21 months ago by jim_

VirtualBox logs.

Changed 21 months ago by jim_

VirtualBox logs.

Changed 21 months ago by jim_

VirtualBox logs.

Changed 21 months ago by jim_

VirtualBox logs.

Changed 21 months ago by jim_

VirtualBox logs.

comment:1 follow-up: ↓ 2 Changed 21 months ago by vushakov

Do you miss data in the guest, on the host or in both directions?

This might be the same regression as in #17093 but you say you see it with 5.1.18. Do I understand correctly that you see it with 5.1.18 on Windows 10, but not with 5.1.18 on Windows 7?

Can you try the tests from #17093 to see if you are seeing the same problem?

comment:2 in reply to: ↑ 1 Changed 20 months ago by jim_

Replying to vushakov:

Do you miss data in the guest, on the host or in both directions?

In the guest.

This might be the same regression as in #17093 but you say you see it with 5.1.18. Do I understand correctly that you see it with 5.1.18 on Windows 10, but not with 5.1.18 on Windows 7?

Yes, I see it with 5.1.18 on Windows 10, but not with 5.1.18 on Windows 7.

Can you try the tests from #17093 to see if you are seeing the same problem?

I think that the problem is different, because in my case, the communication in the guest is established with the only problem that randomly some serial characters are missed.

The serial communication is started from within the guest [Ubuntu 14.04] by using /dev/ttyS0 (physical RS232 port of my PC) from a Linux terminal. The communication works fine although randomly some characters are missed. All the communication process is taking place in the guest (in order to obtain debug traces).

My host operating system is: Windows 10 Enterprise (version: 1709, compilation: 16299.19).

Last edited 20 months ago by vushakov (previous) (diff)

comment:3 follow-up: ↓ 4 Changed 20 months ago by vushakov

Ok, I was not clear enough. Do you miss characters sent to the guest, or characters sent from the guest?

comment:4 in reply to: ↑ 3 Changed 20 months ago by jim_

Replying to vushakov:

Ok, I was not clear enough. Do you miss characters sent to the guest, or characters sent from the guest?

Well, I see traces sent by an IED to my PC. This serial traces can be seen in my Linux terminal, so the missed characters are sent 'to' the guest 'from' an external IED connected to the PC by means of a RS232 com port.

Best regards.

comment:5 Changed 20 months ago by jim_

Hi, are you going to do something about this issue? I see that is stopped five weeks ago. I think that is an important issue. Please go for it.

Regards.

comment:6 Changed 20 months ago by socratis

Keep in mind that psychological pressure, the sort that you tried to apply in your comment, actually makes the developers less keen to look at an issue. Developers have their own priorities and schedule, and unless you're a paying customer, you can't pressure too much for a fix.

comment:7 Changed 20 months ago by jim_

At least, I have warned you about the existence of the problem (thanks for nothing). The effect of the serial port missing characters is very regrettable. Have a nice day and excuse me if I have offend you in any way.

comment:8 Changed 20 months ago by socratis

You have not offended me at all, not sure why you got this as a personal offense. I was simply stating that the developers are aware of these issues and they're working on it. "Bumping" a thread and "demanding" a fix is not the best approach. They have their own priorities and schedule. That's all I was saying...

comment:9 Changed 20 months ago by aeichner

We are aware of the issue but didn't had time to look deeper into this yet because of higher priority issues. Please understand that this bug tracker is handled on a best effort basis, issues from paying customers naturally have a higher priority than issues from non paying users (we still highly appreciate the reports and testing the community does). This also doesn't look like a recent regression (or regression at all) which also has an impact on the priority.

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