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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri, 19 Jul 2019 12:51:44 -0700
Message-ID: <CAHk-=wioLqXBWWQywZGfxumsY_H6dFE3R=+WJ3mAL_WYV1fm9Q@mail.gmail.com>
Subject: Re: [PATCH v8 13/19] locking/rwsem: Make rwsem->owner an atomic_long_t
To:     Waiman Long <longman@redhat.com>
Cc:     Luis Henriques <lhenriques@suse.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Will Deacon <will.deacon@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Davidlohr Bueso <dave@stgolabs.net>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        huang ying <huang.ying.caritas@gmail.com>
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On Fri, Jul 19, 2019 at 12:32 PM Waiman Long <longman@redhat.com> wrote:
>
> This patch shouldn't change the behavior of the rwsem code. The code
> only access data within the rw_semaphore structures. I don't know why it
> will cause a KASAN error. I will have to reproduce it and figure out
> exactly which statement is doing the invalid access.

The stack traces should show line numbers if you run them through
scripts/decode_stacktrace.sh.

You need to have debug info enabled for that, though.

Luis?

             Linus