Ok I've bisected down to this commit causing the issue:
502fac43542acaa225492e5d6f6b5cb0df7fc86c is the first bad commit
commit 502fac43542acaa225492e5d6f6b5cb0df7fc86c
Author: Takashi Iwai <ti...@suse.de>
Date: Fri Oct 12 15:12:55 2012 +0200
ALSA: usb-audio: Fix races at disconnection
BugLink: http://bugs.launchpad.net/bugs/1081676
commit 978520b75f0a1ce82b17e1e8186417250de6d545 upstream.
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However, it works in newer versions, so I'll look around to see if any patches
have fixed this on top of it.
So far I've seen one candidate and its already in the stack:
commit 5eddd573ea494ede9eed59b1468d7079962cb873
Author: Takashi Iwai <ti...@suse.de>
Date: Tue Nov 13 11:22:48 2012 +0100
ALSA: usb-audio: Fix mutex deadlock at disconnection
BugLink: http://bugs.launchpad.net/bugs/1081676
commit 10e44239f67d0b6fb74006e61a7e883b8075247a upstream.
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https://bugs.launchpad.net/bugs/1097396
Title:
Unplugging USB Headset causes Kernel Panic
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