From: Eduardo Valentin <eduval@amazon.com>
To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eduardo Valentin <eduval@amazon.com>,
Ingo Molnar <mingo@kernel.org>,
kernel test robot <fengguang.wu@intel.com>, LKP <lkp@01.org>,
<kvm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>, <wfg@linux.intel.com>,
<aliguori@amazon.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
Date: Mon, 27 Nov 2017 11:08:02 -0800 [thread overview]
Message-ID: <20171127190802.GC12661@u40b0340c692b58f6553c.ant.amazon.com> (raw)
In-Reply-To: <f5382aac-3714-e1e2-8ac9-94b23bd8fe6e@linux.intel.com>
On Mon, Nov 27, 2017 at 10:28:35AM -0800, Dave Hansen wrote:
> On 11/27/2017 10:03 AM, Eduardo Valentin wrote:
> > On top of VM crashes, on your branch:
> > https://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-kaiser.git/log/?h=kaiser-414-tipwip-20171123
> >
> > I am also getting crashes in early userspace, during tlb flushes. When KAISER is enabled and whenever userspace is loaded, I get a stack trace around __do_page_fault() called from restore_regs_and_return_to_kernel(). I saw this very same behavior in your v3 branch (kaiser-414-tipwip-20171121) too.
> >
> > The crashes are followed by a machine halt via NMI. They also get the following warning:
> > WARNING: can't dereference iret registers at fffffffffe198048 for ip page_fault+0x11/0x60
>
> There was a known bug in my branch with not mapping some of the
> interrupt entry routines. Random alignment makes it break or work.
>
> Ingo/Thomas, correct me if I'm wrong, but I think we need folks testing
> here at the moment:
>
> > https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=auto-latest
>
> My tree from last week is ancient gunk at this point. :)
OK, thanks for let me know, I will give it a shot on the tip tree today and send feed back.
--
All the best,
Eduardo Valentin
next prev parent reply other threads:[~2017-11-27 19:08 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-26 11:49 2f47e7e19f ("x86/mm/kaiser: Use PCID feature to make user and .."): WARNING: CPU: 0 PID: 1 at mm/early_ioremap.c:114 __early_ioremap kernel test robot
2017-11-26 11:49 ` kernel test robot
2017-11-27 10:18 ` Ingo Molnar
2017-11-27 10:18 ` Ingo Molnar
2017-11-27 14:51 ` Dave Hansen
2017-11-27 14:51 ` Dave Hansen
2017-11-27 18:03 ` Eduardo Valentin
2017-11-27 18:28 ` Dave Hansen
2017-11-27 18:28 ` Dave Hansen
2017-11-27 19:08 ` Eduardo Valentin [this message]
2017-11-27 16:14 ` Dave Hansen
2017-11-27 16:14 ` Dave Hansen
2017-11-27 22:13 ` Rafael J. Wysocki
2017-11-27 22:13 ` Rafael J. Wysocki
2017-11-27 22:33 ` Rafael J. Wysocki
2017-11-27 22:33 ` Rafael J. Wysocki
2017-11-28 1:22 ` Dave Hansen
2017-11-28 1:22 ` Dave Hansen
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