linux-kernel - Re: 2f47e7e19f ("x86/mm/kaiser: Use PCID feature to make user and .."): WARNING: CPU: 0 PID: 1 at mm/early_ioremap.c:114 __early

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Message-ID: <a60acd2a-213c-c731-4ad0-e9fb77456f7e@linux.intel.com>
Date:   Mon, 27 Nov 2017 06:51:12 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Ingo Molnar <mingo@...nel.org>,
        kernel test robot <fengguang.wu@...el.com>
Cc:     LKP <lkp@...org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        wfg@...ux.intel.com
Subject: Re: 2f47e7e19f ("x86/mm/kaiser: Use PCID feature to make user and
 .."): WARNING: CPU: 0 PID: 1 at mm/early_ioremap.c:114 __early_ioremap

On 11/27/2017 02:18 AM, Ingo Molnar wrote:
> Any ideas about this bug?

I suspect that it's not bisected perfectly.  I did some testing with
that config and it pretty much boots or crashes randomly.

Booting in a VM on a CPU without PCID support gets crashes in early
userspace, which has tended to be a TLB flushing problem.  I'll narrow
it down some more today.