linux-kernel - Re: 92a0f81d89 ("x86/cpu_entry_area: Move it out of the fixmap"): BUG: kernel hang in boot stage

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Date:   Sat, 23 Dec 2017 19:40:34 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     kernel test robot <fengguang.wu@...el.com>
cc:     LKP <lkp@...org>, xen-devel@...ts.xenproject.org,
        kasan-dev@...glegroups.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        wfg@...ux.intel.com
Subject: Re: 92a0f81d89 ("x86/cpu_entry_area: Move it out of the fixmap"):
 BUG: kernel hang in boot stage

On Sun, 24 Dec 2017, kernel test robot wrote:

> Greetings,
> 
> 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/pti
> 
> commit 92a0f81d89571e3e8759366e050ee05cc545ef99
> Author:     Thomas Gleixner <tglx@...utronix.de>
> AuthorDate: Wed Dec 20 18:51:31 2017 +0100
> Commit:     Ingo Molnar <mingo@...nel.org>
> CommitDate: Fri Dec 22 20:13:05 2017 +0100
> 
>     x86/cpu_entry_area: Move it out of the fixmap

Yes, I'm an idiot.

     for (; start < end; start += PMD_SIZE)

which works fine when start + PMD_SIZE does not wrap around to 0 ....

Fix is on the way to git.

Thanks,

	tglx