Comment 7 for bug 1623507

I'm marking the nouveau/Mesa crash as high severity. And the secondary Mir crash is only medium because that's not really the problem at all.

Here's the Mesa crash:

#9 <signal handler called>
No locals.
#10 0x00007fe1e4c4f06c in pushbuf_kref () from /tmp/apport_sandbox_hSYpvb/usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
No symbol table info available.
#11 0x00007fe1e4c4f709 in pushbuf_validate () from /tmp/apport_sandbox_hSYpvb/usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2
No symbol table info available.
#12 0x00007fe1e2fb25ef in nv50_state_validate (nv50=nv50@entry=0x5608093d9c40, mask=mask@entry=4096, validate_list=validate_list@entry=0x7fe1e35ef660 <validate_list_3d>, size=size@entry=25, dirty=dirty@entry=0x5608093da018, bufctx=0x5608093dd6f0) at ../../../../../src/gallium/drivers/nouveau/nv50/nv50_state_validate.c:554
        state_mask = <optimized out>
        ret = <optimized out>
        i = <optimized out>
#13 0x00007fe1e2fb2797 in nv50_state_validate_3d (nv50=nv50@entry=0x5608093d9c40, mask=mask@entry=4096) at ../../../../../src/gallium/drivers/nouveau/nv50/nv50_state_validate.c:564
        ret = <optimized out>
#14 0x00007fe1e2fb4e01 in nv50_clear (pipe=0x5608093d9c40, buffers=4, color=0x7fe1ebbf5acc, depth=1, stencil=0) at ../../../../../src/gallium/drivers/nouveau/nv50/nv50_surface.c:528
        push = 0x56080930e500
        fb = 0x5608093dae28
        i = <optimized out>
        j = <optimized out>
        k = <optimized out>
        mode = 0
#15 0x00007fe1e2c7ea32 in st_Clear (ctx=0x7fe1ebbf4010, mask=2) at ../../../src/mesa/state_tracker/st_cb_clear.c:463
        depthRb = <optimized out>
        stencilRb = <optimized out>
        quad_buffers = <optimized out>
        clear_buffers = 4
        i = <optimized out>
#16 0x00007fe1eb9249f1 in mir::renderer::gl::Renderer::render(std::vector<std::shared_ptr<mir::graphics::Renderable>, std::allocator<std::shared_ptr<mir::graphics::Renderable> > > const&) const (this=0x7fe1d00008c0, renderables=...) at ./src/renderers/gl/renderer.cpp:246