linux-kernel - Re: commit 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 breaks timer

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Date:   Thu, 3 Jan 2019 08:53:11 -0800
From:   "H.J. Lu" <hjl.tools@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: Re: commit 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 breaks timer

On Sun, Dec 30, 2018 at 6:07 PM H.J. Lu <hjl.tools@...il.com> wrote:
>
> On 4.19 branch,
>
> commit 82c8dbb376b9fa9b831c157cbb15664cb4a343e3
> Author: Thomas Gleixner <tglx@...utronix.de>
> Date:   Mon Dec 17 13:31:05 2018 +0100
>
>     posix-timers: Fix division by zero bug
>
>     commit 0e334db6bb4b1fd1e2d72c1f3d8f004313cd9f94 upstream.
>
>     The signal delivery path of posix-timers can try to rearm the timer even if
>     the interval is zero. That's handled for the common case (hrtimer) but not
>     for alarm timers. In that case the forwarding function raises a division by
>     zero exception.
>
>     The handling for hrtimer based posix timers is wrong because it marks the
>     timer as active despite the fact that it is stopped.
>
>     Move the check from common_hrtimer_rearm() to posixtimer_rearm() to cure
>     both issues.
>
> caused:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1662602
>

I opened:

https://bugzilla.kernel.org/show_bug.cgi?id=202123

-- 
H.J.