On Sun, Jul 19, 2020 at 09:05:40PM +0200, Achim Dahlhoff wrote: > >> Reproduceable hung-task in snd_usb_pcm or usb-core > >> in VM with Behringer device. > >> > >> Hello maintainers of usb, > >> > >> I found a reproduceable hung-task problem when trying to use Behringer > >> "Uphoria" audio devices inside VMware workstation, on Debian-SID with > >> kernel 5.7 or with 5.8-rc5 . Kernel-trace and USB IDs are included. > >> > >> Am I right to post here? > > > >Yes. > > > >> The problem occurs every time when accessing the devices. > >> The problem does NOT occur with: > >> - another sound device (griffin) > >> - on native Linux on another machine > > > >What about when you use the problematic machine with native Linux? > >That's really the most important case. > > I have run it with native Linux on the same AMD machine, and now it works. > Tried both the USB2 and the USB3 ports. > > It still outputs these warnings when connecting: > > [ 205.639776] usb 1-6: new high-speed USB device number 8 using xhci_hcd > [ 205.823725] usb 1-6: New USB device found, idVendor=1397, idProduct=0509, bcdDevice= 1.12 > [ 205.823732] usb 1-6: New USB device strings: Mfr=1, Product=3, SerialNumber=0 > [ 205.823736] usb 1-6: Product: UMC404HD 192k > [ 205.823738] usb 1-6: Manufacturer: BEHRINGER > [ 208.045722] xhci_hcd 0000:03:00.0: WARN: buffer overrun event for slot 7 ep 4 on endpoint > [ 208.045844] xhci_hcd 0000:03:00.0: WARN: buffer overrun event for slot 7 ep 4 on endpoint > [ 208.045969] xhci_hcd 0000:03:00.0: WARN: buffer overrun event for slot 7 ep 4 on endpoint > [ 208.046094] xhci_hcd 0000:03:00.0: WARN: buffer overrun event for slot 7 ep 4 on endpoint I have no idea what those are caused by. Do they show up when you use the USB-2 port? > [ 208.046468] retire_capture_urb: 3 callbacks suppressed > > But I cannot see the problem anymore. So the problem is related to > VMware. But other devices, also audio, work in that VMware installation. So at least you have narrowed it down. That's progress! Alan Stern
