linux-kernel - Re: [PATCH v8 13/19] locking/rwsem: Make rwsem->owner an atomic_long

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Message-ID: <CAHk-=wioLqXBWWQywZGfxumsY_H6dFE3R=+WJ3mAL_WYV1fm9Q@mail.gmail.com>
Date:   Fri, 19 Jul 2019 12:51:44 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Luis Henriques <lhenriques@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        huang ying <huang.ying.caritas@...il.com>
Subject: Re: [PATCH v8 13/19] locking/rwsem: Make rwsem->owner an atomic_long_t

On Fri, Jul 19, 2019 at 12:32 PM Waiman Long <longman@...hat.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