On Fri, 21 Apr 2023 16:48:27 +0200, Chris Down wrote: > > Hi Takashi, > > Takashi Iwai writes: > > This patch itself is safe and good to have, so I'm going to take it as > > is. > > Thanks! > > > But I'm still curious in which code path the problem happens. That > > is, we should address such unnecessary repeats if possible. Do you > > have some more data? > > Unfortunately not, I've been running with a kernel testing some other > mm changes recently so haven't had a chance to debug what's going on > here. But it starts like this: > > [Fri Apr 21 13:21:10 2023] usb 3-7: USB disconnect, device number 39 > [Fri Apr 21 13:21:10 2023] usb 3-7.1: USB disconnect, device number 40 > [Fri Apr 21 13:21:10 2023] usb 3-7.1.1: USB disconnect, device number 42 > [Fri Apr 21 13:21:10 2023] usb 3-7.4: cannot submit urb (err = -19) > [Fri Apr 21 13:21:10 2023] usb 3-7.4: Unable to submit urb #2: -19 at snd_usb_queue_pending_output_urbs > [Fri Apr 21 13:21:10 2023] usb 3-7.4: cannot submit urb 0, error -19: no device > [Fri Apr 21 13:21:10 2023] usb 3-7.4: cannot submit urb 0, error -19: no device > [Fri Apr 21 13:21:10 2023] usb 3-7.4: cannot submit urb 0, error -19: no device > [Fri Apr 21 13:21:10 2023] usb 3-7.4: 1:0: usb_set_interface failed (-19) > [Fri Apr 21 13:21:10 2023] usb 3-7.4: 2:0: usb_set_interface failed (-19) > [Fri Apr 21 13:21:10 2023] usb 3-7.1.2: USB disconnect, device number 44 > [Fri Apr 21 13:21:10 2023] usb 3-7.1.4: 1:1: usb_set_interface failed (-19) > [Fri Apr 21 13:21:10 2023] usb 3-7.1.4: 1:1: usb_set_interface failed (-19) > [Fri Apr 21 13:21:10 2023] usb 3-7.1.4: 1:1: usb_set_interface failed (-19) > [Fri Apr 21 13:21:10 2023] usb 3-7.1.4: 1:1: usb_set_interface failed (-19) > [Fri Apr 21 13:21:10 2023] usb 3-7.1.4: 1:1: usb_set_interface failed (-19) > [Fri Apr 21 13:21:10 2023] usb 3-7.1.4: 1:1: usb_set_interface failed (-19) > [Fri Apr 21 13:21:10 2023] usb 3-7.1.4: 1:1: usb_set_interface failed (-19) > [Fri Apr 21 13:21:10 2023] usb 3-7.1.4: 1:1: usb_set_interface failed (-19) > [... thousands of messages ensue ...] > > So it looks like maybe some ordering is not quite right in > destruction, perhaps only on multi-level USB topologies? Hrm, is "usb 3-7.1.4" really the USB audio device? The previous errors like "Unable to submit urb #2..." are certainly for USB audio, and those are with "usb 3-7.4". You patch may still make sense, though. So I'll keep it applied. thanks, Takashi
