linux-kernel - Re: BUG: usb: obex in g_nokia.ko causing kernel panic

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Message-Id: <201311261828.05990@pali>
Date:	Tue, 26 Nov 2013 18:28:05 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	balbi@...com
Cc:	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Aaro Koskinen <aaro.koskinen@....fi>, freemangordon@....bg,
	Sebastian Reichel <sre@...g0.de>
Subject: Re: BUG: usb: obex in g_nokia.ko causing kernel panic

On Tuesday 26 November 2013 18:16:06 Felipe Balbi wrote:
> Hi,
> 
> On Tue, Nov 19, 2013 at 11:51:12AM +0100, Pali Rohár wrote:
> > Hi!
> > 
> > For a long time (since 3.5 or 3.8? - I do not remember) obex
> > subdriver in g_nokia usb gadget module causing kernel panic
> > after module is loaded on Nokia N900. I do not know where
> > is problem and due to immediatelly kernel crash when
> > loading driver I was not able to see any dmesg output. Now
> > I was able to store something into mtd log and here is
> > crash backtrace:
> > 
> > Log Entry 437 (at position 52)
> > <4>[   18.606414] [<c037eac0>] (__schedule+0x5c/0x50c) from
> > [<c037d3bc>] (schedule_timeout+0x1f4/0x25c) <4>[  
> > 18.623809] [<c037d3bc>] (schedule_timeout+0x1f4/0x25c) from
> > [<c037f12c>] (wait_for_common+0xc8/0x1ac) <4>[   18.649291]
> > [<c037f12c>] (wait_for_common+0xc8/0x1ac) from [<c028c1c0>]
> > (omap_i2c_xfer+0x338/0x488) <4>[   18.674499] [<c028c1c0>]
> > (omap_i2c_xfer+0x338/0x488) from [<c0288144>]
> > (__i2c_transfer+0x40/0x74) <4>[   18.692047] [<c0288144>]
> > (__i2c_transfer+0x40/0x74) from [<c0288a2c>]
> > (i2c_transfer+0x6c/0x90) <4>[   18.709320] [<c0288a2c>]
> > (i2c_transfer+0x6c/0x90) from [<c02351c8>]
> > (regmap_i2c_read+0x48/0x68) <4>[   18.726715] [<c02351c8>]
> > (regmap_i2c_read+0x48/0x68) from [<c023161c>]
> > (_regmap_raw_read+0x128/0x220) <4>[   18.752685]
> > [<c023161c>] (_regmap_raw_read+0x128/0x220) from
> > [<c02317b4>] (regmap_raw_read+0xa0/0x130) <4>[   18.779052]
> > [<c02317b4>] (regmap_raw_read+0xa0/0x130) from [<c023193c>]
> > (regmap_bulk_read+0xf8/0x16c) <4>[   18.805694]
> > [<c023193c>] (regmap_bulk_read+0xf8/0x16c) from
> > [<c0238ea8>] (twl_i2c_read+0xa4/0xe0) <4>[   18.823730]
> > [<c0238ea8>] (twl_i2c_read+0xa4/0xe0) from [<c0274d34>]
> > (__twl4030_phy_power.isra.12+0x1c/0x58) <4>[   18.850921]
> > [<c0274d34>] (__twl4030_phy_power.isra.12+0x1c/0x58) from
> > [<c0274df0>] (twl4030_phy_power.part.14+0x80/0xc8)
> > <4>[   18.879699] [<c0274df0>]
> > (twl4030_phy_power.part.14+0x80/0xc8) from [<c0274f9c>]
> > (twl4030_set_suspend+0x54/0x1e8)
> > <4>[   18.908325] [<c0274f9c>]
> > (twl4030_set_suspend+0x54/0x1e8) from [<c027c8c4>]
> > (omap2430_runtime_resume+0x5c/0x64)
> > <4>[   18.937042] [<c027c8c4>]
> > (omap2430_runtime_resume+0x5c/0x64) from [<c0225dd0>]
> > (pm_generic_runtime_resume+0x2c/0x38)
> > <4>[   18.966461] [<c0225dd0>]
> > (pm_generic_runtime_resume+0x2c/0x38) from [<c0229fe0>]
> > (__rpm_callback+0x54/0x80) <4>[   18.995117] [<c0229fe0>]
> > (__rpm_callback+0x54/0x80) from [<c022a04c>]
> > (rpm_callback+0x40/0x74) <4>[   19.013610] [<c022a04c>]
> > (rpm_callback+0x40/0x74) from [<c022b3c8>]
> > (rpm_resume+0x448/0x63c) <4>[   19.031921] [<c022b3c8>]
> > (rpm_resume+0x448/0x63c) from [<c022b2e4>]
> > (rpm_resume+0x364/0x63c) <4>[   19.050140] [<c022b2e4>]
> > (rpm_resume+0x364/0x63c) from [<c022b874>]
> > (__pm_runtime_resume+0x48/0x74) <4>[   19.077728]
> > [<c022b874>] (__pm_runtime_resume+0x48/0x74) from
> > [<c027b4fc>] (musb_gadget_pullup+0x1c/0xb4) <4>[  
> > 19.105895] [<c027b4fc>] (musb_gadget_pullup+0x1c/0xb4) from
> > [<bf025c14>] (usb_function_deactivate+0x54/0xa4
> > [libcomposite])
> > <4>[   19.135955] [<bf025c14>]
> > (usb_function_deactivate+0x54/0xa4 [libcomposite]) from
> > [<bf05b3b8>] (obex_bind+0x124/0x1d8 [usb_f_obex])
> > <4>[   19.166870] [<bf05b3b8>] (obex_bind+0x124/0x1d8
> > [usb_f_obex]) from [<bf025794>] (usb_add_function+0x58/0xf4
> > [libcomposite])
> > <4>[   19.197143] [<bf025794>] (usb_add_function+0x58/0xf4
> > [libcomposite]) from [<bf037420>]
> > (nokia_bind_config+0x204/0x250 [g_nokia])
> > <4>[   19.227905] [<bf037420>]
> > (nokia_bind_config+0x204/0x250 [g_nokia]) from [<bf0263fc>]
> > (usb_add_config+0x28/0xc0 [libcomposite])
> > <4>[   19.258483] [<bf0263fc>] (usb_add_config+0x28/0xc0
> > [libcomposite]) from [<bf03709c>] (nokia_bind+0x9c/0x21c
> > [g_nokia])
> > <4>[   19.288421] [<bf03709c>] (nokia_bind+0x9c/0x21c
> > [g_nokia]) from [<bf0275bc>] (composite_bind+0x74/0x180
> > [libcomposite])
> > <4>[   19.318420] [<bf0275bc>] (composite_bind+0x74/0x180
> > [libcomposite]) from [<c027d658>]
> > (udc_bind_to_driver+0x2c/0xc4)
> > <4>[   19.348114] [<c027d658>]
> > (udc_bind_to_driver+0x2c/0xc4) from [<c027d764>]
> > (usb_gadget_probe_driver+0x74/0x94) <4>[   19.377166]
> > [<c027d764>] (usb_gadget_probe_driver+0x74/0x94) from
> > [<c00086f8>] (do_one_initcall+0x94/0x138) <4>[   19.406005]
> > [<c00086f8>] (do_one_initcall+0x94/0x138) from [<c007a460>]
> > (load_module+0x113c/0x13c4) <4>[   19.434051] [<c007a460>]
> > (load_module+0x113c/0x13c4) from [<c007a7b4>]
> > (SyS_init_module+0xcc/0xec) <4>[   19.462127] [<c007a7b4>]
> > (SyS_init_module+0xcc/0xec) from [<c000dd40>]
> > (ret_fast_syscall+0x0/0x30) <0>[   19.490753] Code:
> > 0a00002e e1a00004 eb001438 e598300c (e5d3202c) <4>[  
> > 19.506805] ---[ end trace 060b62ec0d68a78b ]--- <0>[  
> > 19.523132] Kernel panic - not syncing: Fatal exception in
> > interrupt
> > 
> > (above dump is from 3.12-rc5 kernel)
> 
> looks like it's trying to do i2c transfers from atomic. But
> why only when obex is enabled ? Makes no sense. What do you
> have on userland ? Is there anything trying to access the
> obex interface ? Was the USB cable attached at that time ?

Yes, only when initliaizing obex. Other is ok. Problem is there 
with Maemo userland and also with clean userland (rescueOS) where 
is only busybox and some simple init scripts. On Maemo maybe 
something is trying to access obex, but on rescueOS for sure 
nothing. Problem happends when cable is attached and also when 
not = always.

-- 
Pali Rohár
pali.rohar@...il.com

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