From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Henri Roosen <henriroosen@gmail.com>
Cc: "Xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: [Xenomai] xnarch_xchg infinite loop
Date: Mon, 20 Jan 2014 10:48:01 +0100 [thread overview]
Message-ID: <52DCF0D1.4000307@xenomai.org> (raw)
In-Reply-To: <CANKLDmv_hfbVcWzoxjerWOTEWqEWPnQzUu44GF=SbC0iSopDOg@mail.gmail.com>
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?
--
Gilles.
next prev parent reply other threads:[~2014-01-20 9:48 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-20 8:31 [Xenomai] xnarch_xchg infinite loop Henri Roosen
2014-01-20 9:48 ` Gilles Chanteperdrix [this message]
2014-01-20 10:02 ` Henri Roosen
2014-01-20 20:40 ` Gilles Chanteperdrix
2014-01-22 8:31 ` Henri Roosen
2014-01-22 10:47 ` Gilles Chanteperdrix
2014-01-22 14:49 ` Henri Roosen
2014-01-22 20:20 ` Gilles Chanteperdrix
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