Linux 5.1 aborts when using a KVM switch (Qt monitor hotplug)

[Christopher Juckins]

When using a KVM (keyboard/video/mouse) switch with VirtualBox 5.1 running on Linux Centos7, the guest VMs abort when I switch from my host computer to my second computer.

Here is my setup:

Host computer Centos7 version 7.2.1511 with kernel 3.10.0-327.22.2.el7.x86_64. I installed VirtualBox VirtualBox-5.1-5.1.0_108711_el7-1.x86_64.rpm this morning.

I can start up my two guest VMs (also running Centos7) without issues.

When I toggle my KVM switch from my host Linux computer to my other computer (Windows 10) and then go back to my host Linux computer, both of my guest VMs are gone from my screen. When I restart the main VirtualBox program GUI, both of my guest VMs show "Aborted".

I downgraded back to Virtual Box 5.0 (VirtualBox-5.0-5.0.24_108355_el7-1.x86_64.rpm) and the KVM abort problem disappears.

If I can provide any more information just let me know.

I am trying to attach my VBox log file as well.

Thank you for your help.

Christopher Juckins

[Christopher Juckins]

VBox log file when my session aborted

[Christopher Juckins]

/var/log/messages file from Host Linux computer

[Christopher Juckins]

Apologies for cutting and pasting the /var/log/messages content. I have attached it as a separate file per the instructions.

[Christopher Juckins]

KVM switch info: Manufactured by ioGear Model GCS922U

[Frank Mehnert]

Could you provide a core dump? If so, you might want to contact me via private email at frank _dot_ mehnert _at_ oracle _dot_ com. I cannot provide you a server for uploading so can you provide an URL?

[Christopher Juckins]

Replying to frank:

Could you provide a core dump? If so, you might want to contact me via private email at frank _dot_ mehnert _at_ oracle _dot_ com. I cannot provide you a server for uploading so can you provide an URL?

Sure, let me work on this today/tonight. I'll contact you at the email you provided when I have more information, and yes, I can provide a URL. Thanks.

[Christopher Juckins]

Replying to frank:

Could you provide a core dump? If so, you might want to contact me via private email at frank _dot_ mehnert _at_ oracle _dot_ com. I cannot provide you a server for uploading so can you provide an URL?

Frank, I have sent you an email with the details for obtaining the core files. Many thanks.

[Frank Mehnert]

We've analyzed the core dump and it turned out this is a Qt bug. With KVM the application receives monitor hotplug events and for a short amount of time, there is no monitor attached to your host. This makes Qt5 crash. This is a know issue which _might_ be fixed in Qt 5.6.1. We are working on a workaround but this needs time.

[Christopher Juckins]

Replying to frank: Thank you for the research and update.

[Christopher Juckins]

This issue appears to be resolved as I am using v5.1.18 with no KVM issues.

This ticket may be closed.

[Frank Mehnert]

Thanks for the information!

[Frank Mehnert]

Btw, most likely fixed as of VBox 5.1.10.