linux-kernel - Re: BUG: KASAN: null-ptr-deref in _raw_spin_lock

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Date: Thu, 11 Apr 2024 18:00:25 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: David Gow <davidgow@...gle.com>, Will Deacon <will@...nel.org>,
	mic@...ikod.net, keescook@...omium.org, rmoar@...gle.com,
	lkft-triage@...ts.linaro.org, kunit-dev@...glegroups.com,
	linux-kernel@...r.kernel.org, peterz@...radead.org,
	mingo@...hat.com, longman@...hat.com, boqun.feng@...il.com,
	anders.roxell@...aro.org, arnd@...db.de, linux@...ck-us.net,
	Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: BUG: KASAN: null-ptr-deref in _raw_spin_lock_irq next-20240410

On Thu, Apr 11, 2024 at 08:20:55PM +0530, Naresh Kamboju wrote:
> 
> I use to notice kernel panic while running kunit tests
> now I have noticed this
> 
> Unable to handle kernel paging request at virtual address
> KASAN: null-ptr-deref in range
> pc : kunit_test_null_dereference (lib/kunit/kunit-test.c:119)
> lr : kunit_generic_run_threadfn_adapter (lib/kunit/try-catch.c:31)
> 
> The kunit tests run to completion and the system is stable.
> Kernel did not panic.
> 

[ Snip ]

> <0>[   76.808597] Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
> <4>[   76.809876] Modules linked in:
> <4>[   76.812055] CPU: 1 PID: 567 Comm: kunit_try_catch Tainted: G
> B            N 6.9.0-rc3-next-20240410 #1
> <4>[   76.812987] Hardware name: linux,dummy-virt (DT)
> <4>[   76.814123] pstate: 12400009 (nzcV daif +PAN -UAO +TCO -DIT
> -SSBS BTYPE=--)
> <4>[ 76.814947] pc : kunit_test_null_dereference (lib/kunit/kunit-test.c:119)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
This is a new intentional NULL dereferencer that was added yesterday.

Maybe these should have a big printk, "Intentional NULL dereference
coming up!\n".

regards,
dan carpenter