linux-kernel - Re: [Bug 201637] New: hangup sinse 'x86/mm: Expand static page table for fixmap space' with CONFIG_RANDOMIZE

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Date:   Thu, 8 Nov 2018 14:20:52 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Feng Tang <feng.tang@...el.com>
Cc:     bugzilla-daemon@...zilla.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Juergen Gross <jgross@...e.com>, Ingo Molnar <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...or.com>, boyarsh@...linux.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Bug 201637] New: hangup sinse  'x86/mm: Expand static page
 table for fixmap space' with CONFIG_RANDOMIZE_BASE enabled


(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Thu, 08 Nov 2018 13:48:25 +0000 bugzilla-daemon@...zilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=201637
> 
>             Bug ID: 201637
>            Summary: hangup sinse  'x86/mm: Expand static page table for
>                     fixmap space' with CONFIG_RANDOMIZE_BASE enabled
>            Product: Memory Management
>            Version: 2.5
>     Kernel Version: 4.9.133
>           Hardware: All
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: high
>           Priority: P1
>          Component: Other
>           Assignee: akpm@...ux-foundation.org
>           Reporter: boyarsh@...linux.org
>         Regression: No
> 
> I have early kernel hungup on x86_64 since 4.9.133 and i've finaly bisected it.
> 
> This commit is incompatible with CONFIG_RANDOMIZE_BASE enabled and cause
> immediate silent hangup during boot. 
> 
> commit 3a8304b7ad2e291777e8499e39390145d932a2fd
> Author: Feng Tang <feng.tang@...el.com>
> Date:   Thu Sep 20 10:58:28 2018 +0800
> 
>     x86/mm: Expand static page table for fixmap space
> 
>     commit 05ab1d8a4b36ee912b7087c6da127439ed0a903e upstream.
> 
>     We met a kernel panic when enabling earlycon, which is due to the fixmap
>     address of earlycon is not statically setup.
> 
> -- 
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> You are the assignee for the bug.