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References: <20240410102710.35911-1-naresh.kamboju@linaro.org> <20240410152307.GA25111@willie-the-truck>
In-Reply-To: <20240410152307.GA25111@willie-the-truck>
From: Naresh Kamboju <naresh.kamboju@linaro.org>
Date: Wed, 10 Apr 2024 22:44:42 +0530
Message-ID: <CA+G9fYv2szPTjixaM-QT_cfZWwGSx1Huk2pUtUWP-A9PTMTLOQ@mail.gmail.com>
Subject: Re: BUG: KASAN: null-ptr-deref in _raw_spin_lock_irq next-20240410
To: Will Deacon <will@kernel.org>
Cc: mic@digikod.net, keescook@chromium.org, davidgow@google.com, 
	rmoar@google.com, lkft-triage@lists.linaro.org, kunit-dev@googlegroups.com, 
	linux-kernel@vger.kernel.org, peterz@infradead.org, mingo@redhat.com, 
	longman@redhat.com, boqun.feng@gmail.com, anders.roxell@linaro.org, 
	dan.carpenter@linaro.org, arnd@arndb.de, linux@roeck-us.net, 
	Linux Kernel Functional Testing <lkft@linaro.org>
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On Wed, 10 Apr 2024 at 20:53, Will Deacon <will@kernel.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@linaro.org>
> >
> > Crash log on qemu-arm64:
> > ----------------
> > <3>[ 30.465716] BUG: KASAN: null-ptr-deref in _raw_spin_lock_irq (inclu=
de/linux/instrumented.h:96 include/linux/atomic/atomic-instrumented.h:1301 =
include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/li=
nux/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/a=
tomic-arch-fallback.h:2173 include/linux/atomic/atomic-instrumented.h:1302 =
include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/li=
nux/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 Micka=C3=ABl to cc.
>
> Will

Thank you.

- Naresh

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