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Date:   Fri, 24 Nov 2017 20:09:37 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [crash] PANIC: double fault, error_code: 0x0

On 11/24/2017 12:22 PM, Ingo Molnar wrote:
> [    8.831002] RIP: 0010:page_fault+0x11/0x60
> [    8.831002] RSP: 0000:ffffffffff0e7fc8 EFLAGS: 00010046
> [    8.831002] RAX: 00000000819d4d77 RBX: 0000000000000001 RCX: ffffffff819d4d77
> [    8.831002] RDX: 0000000000000003 RSI: 0000000000000010 RDI: ffffffffff0e8078
> [    8.831002] RBP: 0000000000000000 R08: 00007ffd7f1aa530 R09: 00007f9407f98400
> [    8.831002] R10: 0000000000000007 R11: 0000000000000000 R12: 00007ffd7f1aa680
> [    8.831002] R13: 00007f9407f91f80 R14: 0000000000000007 R15: 0000000000000000
> [    8.831002]  ? native_iret+0x7/0x7
> [    8.831002] WARNING: can't dereference iret registers at ffffffffff0e8048 for ip page_fault+0x11/0x60
> [    8.831002]  </#DF>
> [    8.831002]  <SYSENTER>
> [    8.831002]  ? __do_page_fault+0x4c0/0x4c0
> [    8.831002]  ? page_fault+0x2c/0x60
> [    8.831002]  ? native_iret+0x7/0x7
> [    8.831002]  ? __do_page_fault+0x4c0/0x4c0
> [    8.831002]  ? page_fault+0x2c/0x60
> [    8.831002]  ? __entry_text_end+0x1/0x1
> [    8.831002]  </SYSENTER>

Just a stab in the dark from looking at this for a few seconds...

Doesn't this stack trace mean we started C-code page fault handing on
the sysenter stack?  Seems like we missed a switch to the process stack.

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