StacktraceTop: __assert_fail_base (fmt=<optimized out>, assertion=0x7f92c05365b0 "((*&(&surface->ref_count)->ref_count) > 0)", file=0x7f92c0536580 "/build/buildd/cairo-1.10.2/src/cairo-surface.c", line=<optimized out>, function=<optimized out>) at assert.c:94 __GI___assert_fail (assertion=0x7f92c05365b0 "((*&(&surface->ref_count)->ref_count) > 0)", file=0x7f92c0536580 "/build/buildd/cairo-1.10.2/src/cairo-surface.c", line=614, function=0x7f92c0536940 "cairo_surface_reference") at assert.c:103 cairo_surface_reference (surface=<optimized out>) at /build/buildd/cairo-1.10.2/src/cairo-surface.c:614 cairo_surface_reference (surface=<optimized out>) at /build/buildd/cairo-1.10.2/src/cairo-surface.c:608 ?? ()
StacktraceTop: 0x7f92c05365b0 "((*&(& surface- >ref_count) ->ref_count) > 0)", file=0x7f92c0536580 "/build/ buildd/ cairo-1. 10.2/src/ cairo-surface. c", line=<optimized out>, function=<optimized out>) at assert.c:94 0x7f92c05365b0 "((*&(& surface- >ref_count) ->ref_count) > 0)", file=0x7f92c0536580 "/build/ buildd/ cairo-1. 10.2/src/ cairo-surface. c", line=614, function= 0x7f92c0536940 "cairo_ surface_ reference" ) at assert.c:103 surface_ reference (surface=<optimized out>) at /build/ buildd/ cairo-1. 10.2/src/ cairo-surface. c:614 surface_ reference (surface=<optimized out>) at /build/ buildd/ cairo-1. 10.2/src/ cairo-surface. c:608
__assert_fail_base (fmt=<optimized out>, assertion=
__GI___assert_fail (assertion=
cairo_
cairo_
?? ()