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

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Date: Wed, 10 Apr 2024 22:44:42 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Will Deacon <will@...nel.org>
Cc: mic@...ikod.net, keescook@...omium.org, davidgow@...gle.com, 
	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, 
	dan.carpenter@...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 Wed, 10 Apr 2024 at 20:53, Will Deacon <will@...nel.org> wrote:
>
> On Wed, Apr 10, 2024 at 03:57:10PM +0530, Naresh Kamboju wrote:
> > Following kernel crash noticed on Linux next-20240410 tag while running
> > kunit testing on qemu-arm64 and qemu-x86_64.
> >
> > Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> >
> > Crash log on qemu-arm64:
> > ----------------
> > <3>[ 30.465716] BUG: KASAN: null-ptr-deref in _raw_spin_lock_irq (include/linux/instrumented.h:96 include/linux/atomic/atomic-instrumented.h:1301 include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/linux/spinlock_api_smp.h:120 kernel/locking/spinlock.c:170)

> It's a shame that you have trimmed the register dump here.

My apologies for that, the detailed crash log is attached and
the links provided in the tail of this email.

>
> > <4>[   30.511022] Call trace:
> > <4>[ 30.511437] _raw_spin_lock_irq (arch/arm64/include/asm/atomic_lse.h:271 arch/arm64/include/asm/cmpxchg.h:120 arch/arm64/include/asm/cmpxchg.h:169 include/linux/atomic/atomic-arch-fallback.h:2055 include/linux/atomic/atomic-arch-fallback.h:2173 include/linux/atomic/atomic-instrumented.h:1302 include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/linux/spinlock_api_smp.h:120 kernel/locking/spinlock.c:170)
> > <4>[ 30.512013] wait_for_completion_timeout (kernel/sched/completion.c:84 kernel/sched/completion.c:116 kernel/sched/completion.c:127 kernel/sched/completion.c:167)
> > <4>[ 30.512627] kunit_try_catch_run (lib/kunit/try-catch.c:86)
> > <4>[ 30.513188] kunit_run_case_catch_errors (lib/kunit/test.c:544)
> > <4>[ 30.513801] kunit_run_tests (lib/kunit/test.c:635)
>
> Ok, so 'task_struct->vfork_done' is NULL. Looks like this code was added
> recently, so adding Mickaël to cc.
>
> Will

Thank you.

- Naresh

View attachment "output-kasan-kernel-crash.txt" of type "text/plain" (6870 bytes)