Re: [Xen-devel] Crashing kernel with dom0/libxc gnttab/gntshr

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2013-07-30 at 11:50 +0100, Vincent Bernardoff wrote:
> Hi,
> 
> The attached program makes my kernel (3.9.9-1-ARCH, stock Archlinux 
> kernel) crash with the attached dmesg output.

The dmesg output seems to start halfway through a crash message, which
means it is missing the PC etc and may not be the first crash in any
case.

Please could you configure a serial console and try and capture the
first crash message in its entirety. Bonus points if you can avoid
linewrapping the dmesg too ;-)

> The program just shares a page from dom0 to dom0,

Not just from dom0 to dom0 but actually within the same process. I'm not
sure that matters but it is a bit unusual. Are you able to repro this
with two separate processes acting as front vs. backend?

The reason I ask is that it isn't clear if the crash is the process with
its front or back "hat" on, separating the two out would be useful.

>  then map the page, 
> then unshare the page, and the unsharing makes the kernel crash. I ran 
> into this issue while implementing a native OCaml vchan driver.
> 
> I'm very much interested in advices/help.
> 
> Cheers,
> 
> Vincent
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