linux-kernel - Re: [patch 1/2] tick/broadcast: Prevent deep idle states if no broadcast device available

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Message-ID: <alpine.DEB.2.11.1507062156040.3916@nanos>
Date:	Mon, 6 Jul 2015 21:56:59 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Sudeep Holla <sudeep.holla@....com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Suzuki Poulose <Suzuki.Poulose@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [patch 1/2] tick/broadcast: Prevent deep idle states if no
 broadcast device available

On Mon, 6 Jul 2015, Sudeep Holla wrote:
> This triggered the below crash on boot, looks like it's accessing
> hrtimer->function which is null in periodic mode IIUC
> 
> Regards,
> Sudeep

Gah. I have no idea how that gets queued. /me goes off to tweak x86 to
emulate that crap.
 
> --->8
> 
> Bad mode in Synchronous Abort handler detected, code 0x86000005 -- IABT
> (current EL)
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.2.0-rc1 #577
> Hardware name: ARM Juno development board (r0) (DT)
> task: ffffffc976900000 ti: ffffffc9768fc000 task.ti: ffffffc9768fc000
> PC is at 0x0
> LR is at bc_handler+0x20/0x58
> pc : [<0000000000000000>] lr : [<ffffffc00010f4a4>] pstate: a00001c5
> sp : ffffffc9768ffbd0
> 
> Call trace:
> [<          (null)>]           (null)
> [<ffffffc000101e88>] __hrtimer_run_queues+0xe0/0x150
> [<ffffffc0001028b4>] hrtimer_run_queues+0xb8/0xe8
> [<ffffffc000101714>] update_process_times+0x28/0x6c
> [<ffffffc00010d978>] tick_periodic+0x3c/0xb8
> [<ffffffc00010da1c>] tick_handle_periodic+0x28/0x94
> [<ffffffc0004d61d4>] arch_timer_handler_phys+0x28/0x38
> [<ffffffc0000f5964>] handle_percpu_devid_irq+0x74/0x9c
> [<ffffffc0000f1668>] generic_handle_irq+0x30/0x4c
> [<ffffffc0000f1984>] __handle_domain_irq+0x5c/0xac
> [<ffffffc0000824a8>] gic_handle_irq+0x30/0x80
> 
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