[cairo-bugs] [Bug 91967] New: Assertion "(_cairo_atomic_int_get (&(&surface->ref_count)->ref_count) > 0)"

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Sep 10 14:47:31 PDT 2015


            Bug ID: 91967
           Summary: Assertion "(_cairo_atomic_int_get
                    (&(&surface->ref_count)->ref_count) > 0)"
           Product: cairo
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: xlib backend
          Assignee: chris at chris-wilson.co.uk
          Reporter: alberts.muktupavels at gmail.com
        QA Contact: cairo-bugs at cairographics.org

In _get_image_surface function I get assertion:
Assertion "(_cairo_atomic_int_get (&(&surface->ref_count)->ref_count) > 0)"

1) image is created in "if (try_shm && pixman_format)", line 785
2) then image->base is destroyed in same if, line 809
3) then cairo enters "if (ximage == NULL)", line 836
4) then it fails to get ximage and enters "if (ximage == NULL)", line 879
5) that moves to BAIL where cairo_surface_destroy is called on destroyed?

Application crash. I tried to add "if (cairo_surface_get_reference_count
(&image->base) != )" and it "fixed" assertion/crash. But I guess that is not
right way to fix it.

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