Opened 4 years ago
Last modified 4 years ago
#19933 new defect
Issues due to lost USB packets (control and bulk type transfers)
| Reported by: | bloguetronica | Owned by: | |
|---|---|---|---|
| Component: | USB | Version: | VirtualBox 6.1.14 |
| Keywords: | USB issue host VM bulk control | Cc: | |
| Guest type: | Linux | Host type: | Linux |
Description
Hi all,
I'm using the latest VirtualBox version under Kubuntu 18.04 LTS. I'm having errors when testing a software I've made in a VM running the same OS, but it makes no difference on other VMs running other Linux distributions. However, my software doesn't have issues when it is running on my native machine, no VMs involved. I even tested this on a different machine, and no issues whatsoever even after a few hours.
The history here is that this software controls a USB switcher, monitoring it continuously, ever 200ms (but that can be changed in the options). The USB switcher itself is based on the CP2130 from Silicon Labs. The software has all the kinks ironed, but it fails on a VirtualBox VM, which should not happen. This also happens, seemingly, irregardless of the version of VBox I have installed. I've recently updated to the latest version from the VirtualBox repository, but saw no differences. In fact, I've seen it fail catastrophically and even causing the device to reset (the software forces a reset if more than 10 errors occur) quite rapidly. More frequently, errors are due to lost control transfers, but can happen with bulk transfers as well.
To sort this out, I've decided to run traces with Wireshark, simultaneoulsy inside and outside the VM, monitoring the same connections essentially. I can conclude that there were some lost packets because I've seen errors reporting inside the VM pertaining to packets that simply were not matched to any packets caught outside the VM, which might mean that the request packet never went outside the VM to the USB host, and due to timeout, it generated a ENOENT response inside the VM, but not outside. I must add that responses that exceed 100ms are ruled out the the application.
I have the images proving the issue, the screenshots highlighting some of the packets and the traces taken inside and outside the VM.
Kind regards, Samuel Lourenço
I can't upload any images or the traces, by the way.