From: u.kleine-koenig@pengutronix.de (Uwe Kleine-König)
To: linux-arm-kernel@lists.infradead.org
Subject: Crash on ARM: 8148/1 flush TLS and thumbee register
Date: Mon, 3 Nov 2014 08:47:59 +0100 [thread overview]
Message-ID: <20141103074759.GU8316@pengutronix.de> (raw)
In-Reply-To: <20141102221401.GA4042@n2100.arm.linux.org.uk>
On Sun, Nov 02, 2014 at 10:14:01PM +0000, Russell King - ARM Linux wrote:
> On Sun, Nov 02, 2014 at 11:03:14PM +0100, Stefan Agner wrote:
> > Hi all,
> >
> > While working on Vybrid (vf610) Cortex-M4 support I also hit this crash
> > observed by Joachim:
> >
> > ...
> > Freeing unused kernel memory: 16K (8800a000 - 8800e000)
> >
> > Unhandled exception: IPSR = 00000005 LR = fffffff1
> > CPU: 0 PID: 1 Comm: swapper Not tainted 3.18.0-rc1-00041-ga30465a #216
> > task: 8b838000 ti: 8b82a000 task.ti: 8b82a000
> > PC is at flush_thread+0x32/0x40
> > LR is at flush_thread+0x21/0x40
> > pc : [<8f00157a>] lr : [<8f001569>] psr: 4100000b
> > sp : 8b82be20 ip : 00000000 fp : 8b83c000
> > r10: 00000001 r9 : 88018c84 r8 : 8bb85000
> > r7 : 8b838000 r6 : 00000000 r5 : 8bb77400 r4 : 8b82a000
> > r3 : ffff0ff0 r2 : 8b82a000 r1 : 00000000 r0 : 88020354
> > xPSR: 4100000b
> > CPU: 0 PID: 1 Comm: swapper Not tainted 3.18.0-rc1-00041-ga30465a #216
> > [<8f002bc1>] (unwind_backtrace) from [<8f002033>] (show_stack+0xb/0xc)
> > [<8f002033>] (show_stack) from [<8f00265b>] (__invalid_entry+0x4b/0x4c)
> >
> > Can reproduce it on 3.18-rc1, as well as 3.17.
>
> Hmm, I think KUSER_HELPERS needs to depend on MMU. Nathan?
On Cortex-M3 and M4 addresses that start with 0xf....... cannot be RAM.
So as long as the address is fixed there it won't work on ARMv7-M.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-K?nig |
Industrial Linux Solutions | http://www.pengutronix.de/ |
next prev parent reply other threads:[~2014-11-03 7:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-26 20:57 Crash on ARM: 8148/1 flush TLS and thumbee register Joachim Eastwood
2014-09-26 21:27 ` Nathan Lynch
2014-11-02 22:03 ` Stefan Agner
2014-11-02 22:14 ` Russell King - ARM Linux
2014-11-03 7:47 ` Uwe Kleine-König [this message]
2014-11-03 14:34 ` Nathan Lynch
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