linux-kernel - Re: [RFC] panic on cascade() of kernel/time/timer.c

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Message-ID: <alpine.DEB.2.20.1611301015080.3439@nanos>
Date:   Wed, 30 Nov 2016 10:18:44 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Yisheng Xie <xieyisheng1@...wei.com>
cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Hanjun Guo <guohanjun@...wei.com>,
        Xishi Qiu <qiuxishi@...wei.com>
Subject: Re: [RFC] panic on cascade() of kernel/time/timer.c

On Wed, 30 Nov 2016, Yisheng Xie wrote:

> Hi all,
> The kernel version is 4.1.18, and we got a panic at cascade().
> from the log it seems cause by BUG_ON of kernel/time/timer.c:1120.
> Any ideas about about it?

Probably a timer which got freed while enqueued or some other wreckage in
that area. Certainly not a core code problem.

Enable CONFIG_DEBUG_OBJECTS* and try to reproduce. The debug facility will
tell you which driver/whatever causes the problem.

Thanks,

	tglx