On 01/20/2014 11:02 AM, Henri Roosen wrote:
> On Mon, Jan 20, 2014 at 10:48 AM, Gilles Chanteperdrix <
> [email protected]> wrote:
>
>> On 01/20/2014 09:31 AM, Henri Roosen wrote:
>>> Hi all,
>>>
>>> We have the problem that (hot-)rebooting our Xenomai system fails every 1
>>> out of 10 times.
>>>
>>> The system is an ARM iMX6Solo (Cortex-A9) running Xenomai 2.6.2.1 and
>>> kernel 3.0 (freescale branch).
>>>
>>> When the system hangs at reboot, it is in an infinite loop in the Xenomai
>>> atomic exchange implementation, with STREX always returning 1:
>>>
>>> __xnarch_xchg
>>> S:0xC0094B2C : ADD r3,r6,#0x890
>>> S:0xC0094B30 : LDREX r2,[r3]
>>> S:0xC0094B34 : STREX r1,r9,[r3]
>>> S:0xC0094B38 : TEQ r1,#0
>>> S:0xC0094B3C : BNE {pc}-0xc ; 0xc0094b30
>>>
>>> Does anyone know what is causing the STREX to always return 0 and why it
>>> might get into this state?
>>
>> Normally, strex fails if "something else" stores data in between ldrex
>> and strex. Do you have the full stack trace?
>>
>
> Thank you for your reply Gilles. Please find the stacktrace below:
>
> #0 __xnarch_xchg( size = 4, x = 3204479504, ptr = <Value optimised away by
> compiler> ) at atomic_asm.h:79
> #1 xnintr_irq_handler( irq = 260, cookie = (void*) 0xBF0079E8 ) at
> atomic_asm.h:93
> #2 __ipipe_sync_stage() at core.c:1301
> #3 ipipe_suspend_domain() at core.c:856
> #4 __ipipe_walk_pipeline( pos = (struct list_head*) 0xC0463884 ) at
> core.c:797
> #5 __ipipe_handle_irq( irq = 98, flags = 0 ) at ipipe.c:564
> #6 __ipipe_grab_irq( irq = <Value optimised away by compiler>, regs =
> (struct pt_regs*) 0xCC897DD8 ) at ipipe.c:618
> #7 [__irq_svc+0x40]
I do not really see what is going on. However, how come you have a
driver still running while rebooting? Do you not remove the drivers
before rebooting? Also, __irq_svc means you received an interrupt while
in svc mode, so, it would be interesting to know what is below
__irq_svc. I believe you can know that by adding a call to show_stack
(and preferably build the kernel with frame pointers). The trick will be
to avoid getting a show_stack on every interrupt.
Regards.
--
Gilles.
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