linux-kernel - Softlockup and Hardlockup sample test module

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Message-ID: <CABXF_ACzu=+AKYqPyZwFzFw95KrczVEKaYifmOVuv=YhsvcTtQ@mail.gmail.com>
Date:   Sun, 15 Apr 2018 13:17:27 +0530
From:   Ivid Suvarna <ivid.suvarna@...il.com>
To:     Kernel development list <linux-kernel@...r.kernel.org>,
        kernelnewbies@...nelnewbies.org
Subject: Softlockup and Hardlockup sample test module

Hi All,

Could you please provide some sample test module for causing a
Softlockup and Hardlockup in latest kernel for SMP for testing
purposes. I assume there are some Kconfigs to be enabled as well for
this.

I had tried with the module where I put a busy loop inside spinlock
but was not able to cause any lockups. Maybe this is because of SMP
which schedule the job to other CPU. "How do I make a task to run on
single CPU only?"

I only get RCU stalls sometimes instead of softlockup when I use busy
loop inside a spinlock. Is there any explanation for difference
between these stalls and softlockup.

Thanks,
IVID