linux-kernel - Re: BUG: bad unlock balance detected

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Message-ID: <52CFB091.5040707@linaro.org>
Date:	Fri, 10 Jan 2014 09:34:25 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	John Tobias <john.tobias.ph@...il.com>,
	"<linux-kernel@...r.kernel.org>" <linux-kernel@...r.kernel.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Fabio Estevam <festevam@...il.com>,
	"<kernel@...gutronix.de>" <kernel@...gutronix.de>,
	"<linux-arm-kernel@...ts.infradead.org>" 
	<linux-arm-kernel@...ts.infradead.org>,
	"<linux@....linux.org.uk>" <linux@....linux.org.uk>
Subject: Re: BUG: bad unlock balance detected

On 01/10/2014 03:52 AM, John Tobias wrote:
> Hi Shawn,
>
> Any idea on these bug?.

Is this bug happening systematically or randomly ?



> [ 559.972748] =====================================
> [ 559.977457] [ BUG: bad unlock balance detected! ]
> [ 559.982169] 3.13.0-rc1 #1 Tainted: G O
> [ 559.986790] -------------------------------------
> [ 559.991499] swapper/0 is trying to release lock (master_lock) at:
> [ 559.997642] <8001d708> imx6q_enter_wait+0x80/0x8c
> [ 560.002524] but there are no more locks to release!
> [ 560.007404]
> [ 560.007404] other info that might help us debug this:
> [ 560.013939] no locks held by swapper/0.
> [ 560.017779]
> [ 560.017779] stack backtrace:
> [ 560.022147] CPU: 0 PID: 0 Comm: swapper Tainted: G O 3.13.0-rc1 #1
> [ 560.029200] Backtrace:
> [ 560.031685] <80011fb4> (dump_backtrace+0x0/0x10c) from <80012150>
> (show_stack+0x18/0x1c)
> [ 560.040128] :806c00e8 :8001d708 :806bd1b0 :00000000
> [ 560.045869] <80012138> (show_stack+0x0/0x1c) from <804eeef0>
> (dump_stack+0x20/0x28)
> [ 560.053889] <804eeed0> (dump_stack+0x0/0x28) from <8004b2a8>
> (print_unlock_imbalance_bug+0xb4/0xe4)
> [ 560.063296] <8004b1f4> (print_unlock_imbalance_bug+0x0/0xe4) from
> <8004e338> (lock_release+0x184/0x1bc)
> [ 560.073037] :80be210c :806bd1b0 :806b2000 :00000000
> [ 560.078771] <8004e1b4> (lock_release+0x0/0x1bc) from <804f546c>
> (_raw_spin_unlock+0x20/0x2c)
> [ 560.087572] <804f544c> (_raw_spin_unlock+0x0/0x2c) from <8001d708>
> (imx6q_enter_wait+0x80/0x8c)
> [ 560.096620] :806f2f14 :806bd1b0
> [ 560.100246] <8001d688> (imx6q_enter_wait+0x0/0x8c) from <80305d84>
> (cpuidle_enter_state+0x44/0xfc)
> [ 560.109554] :806dcae0 :00000082 :6128317f :8001d688
> [ 560.115285] <80305d40> (cpuidle_enter_state+0x0/0xfc) from
> <80305f28> (cpuidle_idle_call+0xec/0x15c)
> [ 560.124767] :806b2000 :806dcae4 :806c00f8 :00000001 :80c37030
> :806dcae0
> [ 560.132701] <80305e3c> (cpuidle_idle_call+0x0/0x15c) from <8000fd08>
> (arch_cpu_idle+0x10/0x44)
> [ 560.141662] :00000001 :806e8d8a :806b2000 :806ba0dc :806b2000
> :00000000
> [ 560.149595] <8000fcf8> (arch_cpu_idle+0x0/0x44) from <80056be4>
> (cpu_startup_entry+0x50/0x114)
> [ 560.158568] <80056b94> (cpu_startup_entry+0x0/0x114) from <804ea1e0>
> (rest_init+0xb4/0xdc)
> [ 560.167181] :8181af00 :00000000
> [ 560.170808] <804ea12c> (rest_init+0x0/0xdc) from <80684a98>
> (start_kernel+0x2f0/0x348)
> [ 560.179074] :ffffffff :806f2b80 :806ba158
> [ 560.183750] <806847a8> (start_kernel+0x0/0x348) from <80008070> (0x80008070)
>


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