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

[Vincent Bernardoff <vb@xxxxxxxxxxxxxx>]

On 30/07/2013 11:59, Ian Campbell wrote:
> 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.
Here is the updated version, with a program that calls fork() and here 
is a better dmesg dump as well. The faulty program is the server (sharer).
Vincent

Attachment: libxc_gntshr_bug2.c
Description: Text Data

Attachment: dmesg.log
Description: Text Data

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