qemu crashes sporadically with mesa debug builds on the host side

This is an error that happens sporadically, i.e. since these zombie_sampler_view patches landed the following assertion is raised sporadically:

src/mesa/state_tracker/st_context.c:279: st_save_zombie_sampler_view: Assertion `view->context == st->pipe' failed

It could be a radeonsi issue, but it's more likely it is a virglrenderer issue.