Kernel panic (?) caused by USB MIDI

[kappa8086]

Steps to reproduce:
1. connect a usb midi device onto any usb port and power it on (should connect 1 more if you have, then may skip step 2)
2. start fluidsynth, whatever params, make it run
3. aconnect to connect the two MIDI ports above created
4. unplug / power down the device

then USB subsystem error like

......
usb 1-1.3: urb status -32
hub 1-1:1.0: hub_port_status failed (err = -110)

and then everything freezes, keyboard, networking, and background music (mpd) after a few seconds, leaving the green LED on board lid constantly.

I think this is related to linux-rsapberrypi USB driver or snd_seq_midi module, since another board (cubieboard2), running archlinux as well, behaves normally in the same situation. (I have written a udev rule for cleanup automatically.)

[kappa8086]

Im using Rpi2
forgot to say that.

[DougieLawson]

Have you added

Code: Select all

max_usb_current=1

to your /boot/config.txt?

[kappa8086]

Have you added

Code: Select all

max_usb_current=1

to your /boot/config.txt?

Not yet, I will try later, but I doubt if it can solve the problem, because everything is OK if I don't try to disconnect it, or "acconect -d" first

[kappa8086]

No luck, still crashes.
a kernel BUG rather than a hardware issue I think,
a midi keyboard should not be that power-cost indeed

[DougieLawson]

It looks like a hardware issue. What happens if you plug your USB device into a Windows laptop or Mac?

[gregeric]

Think it's RPi related as the OP reports all fine on his Cubieboard2, also running Arch.

Is your kernel up to date? There were patches applied to the Pi's dwc_otg USB host controller driver about a month to make it robust against the quirks of the upstream DM9601 driver, maybe those changes will help with your USB Midi - worth a shot.

[kappa8086]

It looks like a hardware issue. What happens if you plug your USB device into a Windows laptop or Mac?

No issue.

I'd to say it's not a normal way to shut it down before "acconnect -d xx xxx" closes the software-layer connection, but I want to use it headlessly, so the disconnect signal is used to trigger udev script, however the system has always been crashed before the script runs.

I have a MIDI keyboard and a USB midi converter, I also tried the latter one instead, as long as aconnect shows the connection, I can't unplug it without a crash.

[kappa8086]

Think it's RPi related as the OP reports all fine on his Cubieboard2, also running Arch.

Is your kernel up to date? There were patches applied to the Pi's dwc_otg USB host controller driver about a month to make it robust against the quirks of the upstream DM9601 driver, maybe those changes will help with your USB Midi - worth a shot.

Always the newest I think.

[kappa8086]

Still existing, where else should I report this to the kernel developers?