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]
Thanks,
Henri
> --
> Gilles.
>
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