linux-kernel - Re: Kernel Oops: btusb: 4.2rc1 System lockup with BT dongle insert

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Date:	Fri, 17 Jul 2015 02:14:06 -0400
From:	simon@...gewell.org
To:	linux-bluetooth@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, "Milo Kim" <milo.kim@...com>
Subject: Re: Kernel Oops: btusb:  4.2rc1 System lockup with BT dongle insert
 - log attached


> It looks like the firmware 'opt_flags' must be different, so this may be a
> contributing factor.

Plot thickens.... kernel config has changed since I built 4.1.0rc7, but I
don't recall doing it or starting a fresh.

/boot/config-4.1.0-rc7+
--
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
CONFIG_FW_LOADER_USER_HELPER=y
# CONFIG_FW_LOADER_USER_HELPER_FALLBACK is not set
CONFIG_WANT_DEV_COREDUMP=y
CONFIG_ALLOW_DEV_COREDUMP=y
CONFIG_DEV_COREDUMP=y
--

/boot/config-4.2.0-rc1+
--
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
CONFIG_FW_LOADER_USER_HELPER=y
CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y   <------------!!!
CONFIG_WANT_DEV_COREDUMP=y
CONFIG_ALLOW_DEV_COREDUMP=y
CONFIG_DEV_COREDUMP=y
--


Has a kconfig forced a change?.... Grrr
--
$ git blame ./drivers/leds/Kconfig
--
c93d08fa7 (Milo(Woogyom) Kim         2013-02-05 18:01:23 +0900 228) config
LEDS_LP55XX_COMMON
33b3a561f (Kim, Milo                 2013-07-09 02:11:37 -0700 229)    
tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
33b3a561f (Kim, Milo                 2013-07-09 02:11:37 -0700 230)    
depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
10c06d178 (Milo(Woogyom) Kim         2013-02-05 19:17:20 +0900 231)    
select FW_LOADER
b67893206 (Milo Kim                  2015-06-28 17:39:14 -0700 232)    
select FW_LOADER_USER_HELPER_FALLBACK                                
<-----!!!!
c93d08fa7 (Milo(Woogyom) Kim         2013-02-05 18:01:23 +0900 233)     help
33b3a561f (Kim, Milo                 2013-07-09 02:11:37 -0700 234)      
This option supports common operations for LP5521/5523/55231/5562/8501
c93d08fa7 (Milo(Woogyom) Kim         2013-02-05 18:01:23 +0900 235)      
devices.
--

So in summary this problem is showing up now as the 'User Helper Fallback'
is now forced on, obviously the underlying problem needs to be fixed - but
I don't know when it crept in.

Will try building 4.1 with this option to see if it fails.
Simon

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