Re: [BUG] mm locking order violation when HVM guest changes graphics mode on virtual graphics adapter.

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 31/10/13 14:00, Austin S Hemmelgarn wrote:
> Reliably reproducible, occurs when HVM guest changes graphics mode
> virtual graphics adapter on Xen 4.3.0 from Gentoo.
>
> To reproduce: Using Xen 4.3.0 from Gentoo Portage Tree, and the
> corresponding version of Xl, both built with GCC 4.7.3 with HVM and
> qemu-dm support built in:
> 1. Boot using a Gentoo Linux Dom0 with kernel version 3.10.7-r1 built
> with the kernel config found at http://pastebin.com/GxDpPsk3.
> 2. Get a copy of the fedora i686 network install CD.
> 2. Start a HVM domain with a configuration like the one found at
> http://pastebin.com/p0wxnaTg.
> 3. After connecting to the VNC console, start the install process.
> 4. When Anaconda tries to start the graphical environment, causing the
> kernel to change the graphics mode from the current setting, xen will
> crash with a call to BUG() in mm.h at line 118.
>
> Xen log can be found at http://pastebin.com/zKCJsp21.
> xl info output can be found at http://pastebin.com/NqtksS18.
> lspci -vvv output can be found at http://pastebin.com/Ja97Cx42.
> xenstore contents can be found at http://pastebin.com/aL9vpxwu.
>
> I'll be happy to provide any other information you may need upon request.

Are you able to build Xen yourself?  If so, could you try running with a
debug build of Xen?

~Andrew

>
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