Re: [Xen-users] Hypervisor trap when dumping register

[Julien Grall <julien.grall@xxxxxxx>]

Hello,

Again, please configure your e-mail client to quote properly. I.e using 
'>' rather than tabulations.
On 25/05/16 02:18, Chenxiao Zhao wrote:
> On Tue, May 24, 2016 at 12:20 PM Julien Grall <julien.grall@xxxxxxx
> <mailto:julien.grall@xxxxxxx>> wrote:
>
>
>
>     On 24/05/2016 05:00, Chenxiao Zhao wrote:
>      > Hi
>
>     Hello,
>
>      > I'm playing xen on Hikey board which has octa-core with
>     Cortex-A53. When
>      > I am trying to dump core registers on xen console (press 'd'), I got
>      > Hypervisor trap error.
>      >
>      > Anyone can explain why it happen and how to fix it?
>      >
>      > Thanks.
>      >
>      > (XEN) 'd' pressed -> dumping registers
>      > (XEN)
>      > (XEN) *** Dumping CPU0 host state: ***
>      > (XEN) ----[ Xen-4.7.0-rc  arm64  debug=y  Not tainted ]----
>      > (XEN) CPU:    0
>      > (XEN) PC:     0000000000245ed8Hypervisor Trap. HSR=0x96000007 EC=0x25
>
>     EC=0x25 (see D7.2.27 in ARM DDI 0487A.i) is a data abort from the
>     hypervisor. Can you please paste all the logs, give the rc you are
>     using...
>
>
> Hi, Julien
>
> This is all the logs and the system get halt on the last line. I am
> using 4.7.0-rc which is checked out from git repository master branch.
So you are saying there is no log before hand too?

> I found it is caused by a printk in xen/arch/arm/trap.c where is trying
> to print out symblo for PC with %pS in show_registers_64(). It will
> finally call a vsnprintf to format the string.
>
> When I comment out all the lines that has printk with %pS or changed the
> %pS to %p, every thing works fine. So I guess this is maybe a bug on
> arm64 with libc?
Xen does not use the libc.

> I have tried several versions of linaro's latest gcc and still got no luck.
>
> Any advise?
Let first figure out why you do not get any log but the line you paste. 
You can try to pass "sync_console" on the Xen commandline.
Regards,

--
Julien Grall

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