linux-kernel - Re: [tip: timers/core] hrtimer: Annotate lockless access to timer->state

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Message-ID: <CANn89iKXi3rWWruKoBwQ8rncwLvkbzjZJWuJL3K05fjAhcySwg@mail.gmail.com>
Date:   Wed, 6 Nov 2019 14:53:43 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     linux-tip-commits@...r.kernel.org,
        syzbot <syzkaller@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>
Subject: Re: [tip: timers/core] hrtimer: Annotate lockless access to timer->state

On Wed, Nov 6, 2019 at 2:24 PM tip-bot2 for Eric Dumazet
<tip-bot2@...utronix.de> wrote:
>
> The following commit has been merged into the timers/core branch of tip:
>
> Commit-ID:     56144737e67329c9aaed15f942d46a6302e2e3d8
> Gitweb:        https://git.kernel.org/tip/56144737e67329c9aaed15f942d46a6302e2e3d8
> Author:        Eric Dumazet <edumazet@...gle.com>
> AuthorDate:    Wed, 06 Nov 2019 09:48:04 -08:00
> Committer:     Thomas Gleixner <tglx@...utronix.de>
> CommitterDate: Wed, 06 Nov 2019 23:18:31 +01:00
>
> hrtimer: Annotate lockless access to timer->state
>

I guess we also need to fix timer_pending(), since timer->entry.pprev
could change while we read it.

I will try to find a KCSAN report showing the issue.

Thanks !