linux-kernel - Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509 certs

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Message-ID: <20180104003830.GB1654@trogon.sfo.coreos.systems>
Date:   Wed, 3 Jan 2018 16:38:30 -0800
From:   Benjamin Gilbert <benjamin.gilbert@...eos.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        x86@...nel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org, stable@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: "bad pmd" errors + oops with KPTI on 4.14.11 after loading X.509
 certs

On Wed, Jan 03, 2018 at 04:27:04PM -0800, Andy Lutomirski wrote:
> How much memory does the affected system have?  It sounds like something
> is mapped in the LDT region and is getting corrupted because the LDT code
> expects to own that region.

We've seen this on systems from 1 to 7 GB.

--Benjamin Gilbert