Re: Pull USB plug while fftest on PS4 pad --> Kernel panic

Hello,

I did some more testing (now with a virtual machine).

I've updated to Kernel version 4.4.1. The problem stays the same.

Then I tried with a PS3 controller and (as somehow expected, as the same 
driver is involved), I have the same problem.

The kernel panic, directly after unplugging, only occured once, but the 
following is 100% reproducible:

- Open fftest and run some effect on the controller.
- Unplug the controller while fftest is still running. It doesn't matter 
if an effect is still playing.
- After doing so, plug *any* USB HID game controller, you like. I used 
some cheap noname controller. For me plugging whatever USB HID game 
controller finally crashes the kernel with 100% success rate.

So it seems to be the case, that the hid-sony module somehow breaks 
parts deeper in the USB HID stack in the kernel.

This problem doesn't occur with the xpad driver and a Xbox 360 gamepad, 
so it is no general problem which happens with every supported game 
controller.

Any feedback would be nice. Am I in the right mailing list for bug reports?

Thanks in advance.

Best regards,

Manuel


On 02/05/2016 10:03 PM, Manuel Reimer wrote:

Hello,

I'm currently using the following Kernel version:
Linux manuelspc 4.3.3-3-ARCH #1 SMP PREEMPT Sun Jan 24 10:28:30 CET 2016
x86_64 GNU/Linux

While testing with force feedback, I found the following bug which makes
it impossible to disconnect the PS4 controller while some "force
feedback user" (may also be a game) is still running.

To reproduce, connect a PS4 controller via USB. Now run "fftest" on it
and choose effect number "0".

While the effect still runs, pull the USB plug.

Result: The kernel panics. Had to hard-reset the machine.

Is it OK to just report this here or should I open a bug on Bugzilla for
that?
If more information is needed, just ask.

Best regards,

Manuel

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