From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: BUG: commit "ARM: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW on pre-ARMv6 CPUs" breaks armv5 with CONFIG_PREEMPT
Date: Thu, 20 Jun 2013 10:25:27 +0100 [thread overview]
Message-ID: <20130620092527.GD2842@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <51C2C0B5.8020802@pengutronix.de>
Hi Marc,
On Thu, Jun 20, 2013 at 09:43:33AM +0100, Marc Kleine-Budde wrote:
> The problem can be reproduced on several mx28 and an at91sam9263 and
> only occurs of CONFIG_PREEMPT (Preemptible Kernel (Low-Latency Desktop))
> is enabled.
>
> I have the gut feeling that the "if (irqs_disabled())" check in the
> above patch is not correct for CONFIG_PREEMPT.
>
> Marc
>
> [1] The test program creating 150 threads in a row crashes like this:
> > [8]+ Segmentation fault ./thread_test_c
> > [5] Illegal instruction ./thread_test_c
> > [4] Illegal instruction ./thread_test_c
> > [2] Segmentation fault ./thread_test_c
> > [3] Illegal instruction ./thread_test_c
> > [1] Segmentation fault ./thread_test_c
Any chance you can make your test available somewhere please? I remember
testing on a 926 when the patch was written, so it could be a bad
interaction with some later changes.
Cheers,
Will
next prev parent reply other threads:[~2013-06-20 9:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-20 8:43 BUG: commit "ARM: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW on pre-ARMv6 CPUs" breaks armv5 with CONFIG_PREEMPT Marc Kleine-Budde
2013-06-20 9:25 ` Will Deacon [this message]
2013-06-20 9:51 ` Marc Kleine-Budde
2013-06-20 9:57 ` Catalin Marinas
2013-06-20 10:08 ` Marc Kleine-Budde
2013-06-20 10:14 ` Marc Kleine-Budde
2013-06-20 10:28 ` Catalin Marinas
2013-06-20 11:12 ` Catalin Marinas
2013-06-20 11:35 ` Marc Kleine-Budde
2013-06-20 11:39 ` Marc Kleine-Budde
2013-06-20 11:47 ` Marc Kleine-Budde
2013-06-20 12:48 ` Marc Kleine-Budde
2013-06-20 13:01 ` Catalin Marinas
2013-06-20 13:05 ` Marc Kleine-Budde
2013-06-21 10:28 ` Marc Kleine-Budde
2013-06-21 13:52 ` Catalin Marinas
2013-07-17 8:41 ` Marc Kleine-Budde
2013-07-17 8:51 ` Russell King - ARM Linux
2013-07-17 11:48 ` Marc Kleine-Budde
2013-07-17 19:41 ` Catalin Marinas
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