linux-kernel - Re: kunit_test: KASAN: null-ptr-deref in range - kunit_generic_run_threadfn_adapter on qemu

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Message-ID: <81d3f794-a19b-4b62-8c21-7c6ef9acb552@moroto.mountain>
Date: Tue, 4 Jun 2024 11:21:34 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: open list <linux-kernel@...r.kernel.org>, kunit-dev@...glegroups.com,
	lkft-triage@...ts.linaro.org,
	Linux Regressions <regressions@...ts.linux.dev>, smayhew@...hat.com,
	David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>,
	Ivan Orlov <ivan.orlov0322@...il.com>, npache@...hat.com,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: kunit_test: KASAN: null-ptr-deref in range -
 kunit_generic_run_threadfn_adapter on qemu_arm64

On Mon, Jun 03, 2024 at 07:39:24PM +0530, Naresh Kamboju wrote:
> The following kernel null pointer dereference is noticed on qemu-arm64
> while running
> kunit tests with the Linux next-20240603 tag kernel.
> 
> This is always reproducible and the system is stable after this.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

These are intentional...  The function name just changed so it's showing
up as a new bug.  I tried to add a big printk before this NULL
dereference but the printk message never showed up in dmesg...

+       kunit_info(test, "Testing that a NULL dereference causes a test failure\n");
+       kunit_info(test, "*** This will lead to an intentional stack trace ***\n");

regards,
dan carpenter