Re: [Xen-devel] libxl assertion failure when creating any kind of guest

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, May 22, 2019 at 02:40:51AM -0600, Jan Beulich wrote:
> >>> On 22.05.19 at 09:25, <olaf@xxxxxxxxx> wrote:
> > Am Wed, 22 May 2019 01:11:54 -0600
> > schrieb "Jan Beulich" <JBeulich@xxxxxxxx>:
> > 
> >> libxl__domain_build_info_setdefault (gc=0x7fffffffdee0, 
> > b_info=0x7fffffffdb80)
> >>     at libxl_create.c:143
> > 
> > This is libxl_defbool_val(b_info->device_model_stubdomain).
> > 
> > Due to the lack of a proper way to describe all the dependencies within
> > libxl I suggest to revert these commits for the time being:
> > 
> > 278c64519c libxl: fix libxl_domain_need_memory after 899433f149d
> > 899433f149 libxl: fix migration of PV and PVH domUs with and without qemu
> > 3802ecbaa9 libxl: add helper function to set device_model_version
> 
> Well, the alternative is the one line change below.
> 
> Jan
> 
> libxl: further fix libxl_domain_need_memory() after 899433f149d
> 
> Besides providing a device_model_version setting (as done by 278c64519c
> ["libxl: fix libxl_domain_need_memory after 899433f149d"]), one is also
> needed for device_model_stubdomain, or else the respective assert() in
> libxl_defbool_val() (called from libxl__domain_build_info_setdefault())
> will trigger.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> --- unstable.orig/tools/libxl/libxl_mem.c
> +++ unstable/tools/libxl/libxl_mem.c
> @@ -472,6 +472,7 @@ int libxl_domain_need_memory(libxl_ctx *
>       * calculation doesn't really care which QEMU is set here, so we
>       * go with the upstream default.
>       */
> +    libxl_defbool_setdefault(&b_info->device_model_stubdomain, false);
>      if (!b_info->device_model_version)
>          b_info->device_model_version = LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN;
>  

I have reverted those patches. There is one more regression that's more
serious and it is blocking osstest.

Wei.

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