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From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     Sergei Poselenov <sposelenov@emcraft.com>
Cc:     linux-rt-users@vger.kernel.org
Subject: Re: kernel crash with ARM64 5.4.47 preempt_rt
Message-ID: <20210107164902.5guoavadivwugsz3@linutronix.de>
References: <20201230140917.50e86fc3@sergmir.emcraft.com>
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On 2020-12-30 14:09:17 [+0300], Sergei Poselenov wrote:
> Hello,
Hi,

> We applied patch-5.4.47-rt28.patch to NXP 5.4.47-2.2.0 release ARM64
> kernel running on IMX8M NANO chip, and enabled CONFIG_PRREMPT_RT. We
> are observing the following crash (below), on a system running an
> application that communicates with some SPI device. Obviously, the
> system doesn't crash without the patch applied.
> 
> Any thoughts on the reason of the failure would be appreciated. How would we start debugging the problem?

Can you give v5.10 a try v5.10 and/or enable SLUB_DEBUG?

> Thanks!
> 
> Regards,
> Sergei Poselenov,
> Emcraft Systems

Sebastian