linux-kernel - regression: snd-usb-audio kernel panic NULL pointer exception

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Message-ID: <CADDKRnAMTfku50K_DDOYS42Lm=4WNUg8276LgwGDZNi3-mnUkg@mail.gmail.com>
Date:   Fri, 16 Dec 2016 11:12:17 +0100
From:   Jörg Otte <jrg.otte@...il.com>
To:     tiwai@...e.de
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: regression: snd-usb-audio kernel panic NULL pointer exception

if I connect Logitech usb audio speaker (idVendor=1130, idProduct=1620) I get
a kernel panic - fatal exception in interrupt.

There is nothing written into the logs so this
is a hand written excerpt from screen:

call trace:
<irq>
? snd_complete_urb
? __usb_hcd_giveback_urb
? xhci_giveback_urb_in_irq.isra
? ata_scsi_qc_complete
? finish_td.isra.59
? xhci_irq
? enqueue_task_fair
? __handle_irq_event_percpu
? handle_irq_even
? handle_udge_irq
? handle_irq
? do_irq
? common_interrupt
</irq>
? cpuidle_enter_state
? cpuidle_enter_state
? do_idle
? cpu_startup_entry
? start_secondary
? start_cpu

Code:
RIP: retrieve_playback_urb+0xd
CR2: 00000000000010

Last known good kernel is: 4.9.0-07150-gcdb98c2
First known bad kernel is: 4.9.0-08648-g5cc60ae

Thanks, Jörg