[Bug 238931] graphics/mesa-dri: mutter and gnome-shell segfault when i915kms.ko from base is used

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238931

            Bug ID: 238931
           Summary: graphics/mesa-dri: mutter and gnome-shell segfault
                    when i915kms.ko from base is used
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

Since the update of Mesa to 18.3.2, I am unable to run mutter and gnome-shell
with i915kms.ko from base. Xorg can be successfully started, and simple
programs such as xterm and glxgears work. However, GDM won't show anything
because gnome-shell segfault immediately in /usr/local/lib/dri/i965_dri.so. The
segfault issue can be avoided by downgrading Mesa to 18.2.8 or switching to
drm-fbsd12.0-kmod, but downgrading is seldom the correct way to resolve
problem. Switching to drm-fbsd12.0-kmod is also not practical on this computer
because of memory leak:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238925. I tried to upgrade
Mesa to 18.3.6 with patch from https://reviews.freebsd.org/D19099, but the
result was the same. I also tried the patch posted at
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235487#c11, but it didn't
help as well.

This is the backtrace of mutter 3.33.3-30-gf2f4af0d5 running with Mesa 18.3.6.

#0  memcpy () at /usr/src/lib/libc/amd64/string/memmove.S:268
#1  0x000000080415c2d5 in ?? () from /usr/local/lib/dri/i965_dri.so
#2  0x000000080415b170 in ?? () from /usr/local/lib/dri/i965_dri.so
#3  0x0000000803e8f6db in ?? () from /usr/local/lib/dri/i965_dri.so
#4  0x0000000803e8e791 in ?? () from /usr/local/lib/dri/i965_dri.so
#5  0x0000000803e95fa1 in ?? () from /usr/local/lib/dri/i965_dri.so
#6  0x0000000803b87c9a in ?? () from /usr/local/lib/dri/i965_dri.so
#7  0x0000000803b87d76 in ?? () from /usr/local/lib/dri/i965_dri.so
#8  0x0000000803e97a65 in ?? () from /usr/local/lib/dri/i965_dri.so
#9  0x0000000803e96824 in ?? () from /usr/local/lib/dri/i965_dri.so
#10 0x0000000803b71d91 in ?? () from /usr/local/lib/dri/i965_dri.so
#11 0x0000000803b71faa in ?? () from /usr/local/lib/dri/i965_dri.so
#12 0x0000000800b52ce1 in _cogl_texture_driver_upload_to_gl (ctx=0x802d40800,
gl_target=<optimized out>, gl_handle=1, is_foreign=0, source_bmp=0x802c634a0,
internal_gl_format=6408, source_gl_format=6408, 
    source_gl_type=5121, error=0x0) at
../../source/mutter/cogl/cogl/driver/gl/gl/cogl-texture-driver-gl.c:333
#13 0x0000000800b47860 in allocate_from_bitmap (tex_2d=<optimized out>,
loader=<optimized out>, error=0x0) at
../../source/mutter/cogl/cogl/driver/gl/cogl-texture-2d-gl.c:268
#14 0x0000000800b757fa in cogl_texture_allocate (texture=0x802c24ea0,
error=0x0) at ../../source/mutter/cogl/cogl/cogl-texture.c:1087
#15 0x0000000800b76c52 in cogl_texture_2d_new_from_data (ctx=0x802d40800,
width=1, height=1, format=<optimized out>, rowstride=<optimized out>,
data=<optimized out>, error=0x0)
    at ../../source/mutter/cogl/cogl/cogl-texture-2d.c:224
#16 0x0000000800b54eb4 in cogl_context_new (display=<optimized out>,
error=<optimized out>) at ../../source/mutter/cogl/cogl/cogl-context.c:398
#17 0x0000000800c53009 in clutter_backend_do_real_create_context
(backend=<optimized out>, driver_id=<optimized out>, error=<optimized out>) at
../../source/mutter/clutter/clutter/clutter-backend.c:294
#18 0x0000000800c52cbf in clutter_backend_real_create_context
(backend=<optimized out>, error=0x7fffffffd780) at
../../source/mutter/clutter/clutter/clutter-backend.c:377
#19 0x0000000800c6af95 in _clutter_feature_init (error=0x7fffffffd780) at
../../source/mutter/clutter/clutter/clutter-feature.c:101
#20 0x0000000800c7f119 in clutter_init_real (error=0x7fffffffd780) at
../../source/mutter/clutter/clutter/clutter-main.c:1355
#21 0x0000000800c7ef12 in post_parse_hook (context=<optimized out>,
group=<optimized out>, data=<optimized out>, error=0x7fffffffd780) at
../../source/mutter/clutter/clutter/clutter-main.c:1513
#22 0x00000008004906c8 in g_option_context_parse (context=0x802d0e220,
argc=0x802d0e220, argv=<optimized out>, error=<optimized out>) at
../../source/glib/glib/goption.c:2224
#23 0x0000000800c7f2e8 in clutter_parse_args (argc=0x0, argv=0x0,
error=0x7fffffffd7c0) at
../../source/mutter/clutter/clutter/clutter-main.c:1732
#24 0x0000000800c7f1de in clutter_init (argc=0x0, argv=0x0) at
../../source/mutter/clutter/clutter/clutter-main.c:1794
#25 0x00000008002feebb in meta_clutter_init () at
../../source/mutter/src/backends/meta-backend.c:1355
#26 0x0000000800345904 in meta_init () at
../../source/mutter/src/core/main.c:592
#27 0x0000000000219678 in main (argc=1, argv=0x7fffffffd8f8) at
../../source/mutter/src/core/mutter.c:82

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