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Re: [Xen-devel] Re: BUG: x86-64 VT crash backtrace

To: Rik van Riel <riel@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: BUG: x86-64 VT crash backtrace
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Tue, 25 Jul 2006 18:12:08 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, jun.nakajima@xxxxxxxxx
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On 25 Jul 2006, at 17:55, Rik van Riel wrote:

here is the x86-64 VT crash backtrace, as promised. I can trigger it within minutes by simply starting up a 64 bit VT domain on a 64 bit system.

And another, more creative one.  It seems to have bitmap_subset
in common with the first backtrace, and the assertion looks like
it could be a useful hint:

Looks like another stack overflow. I think maybe the double-fault handling is broken and that caused the assertion. What xen-unstable changeset are you running on?

 -- Keir

(XEN) (file=extable.c, line=77) Pre-exception: ffff830000153d1d -> 0000000000000000
(XEN) ----[ Xen-3.0-unstable    Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    e010:[<ffff830000153d1d>] bitmap_subset+0x30/0x9d
(XEN) RFLAGS: 0000000000010046   CONTEXT: hypervisor
(XEN) rax: fffffffffffffffc rbx: ffff8300002230b8 rcx: 0000000000000000 (XEN) rdx: 0000000000000002 rsi: ffff83000024db08 rdi: ffff830000223060 (XEN) rbp: ffff830000223018 rsp: ffff830000222fe8 r8: 0000000000000000

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