[Bug 91848] Segfault in intel_mipmap_tree.c:2571 calling glReadPixels from mpv on wayland

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91848

            Bug ID: 91848
           Summary: Segfault in intel_mipmap_tree.c:2571 calling
                    glReadPixels from mpv on wayland
           Product: Mesa
           Version: git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: kevmitch at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 118048
  --> https://bugs.freedesktop.org/attachment.cgi?id=118048&action=edit
gdb -ex run --no-config --force-window --idle --msg-level=all=trace build/mpv

When taking a "window" screenshot in mpv (Ctrl+S), which reads the image
directly from the framebuffer using glReadPixels on wayland, I get the attached
backtrace which terminates at

intel_miptree_attach_map (mode=1, h=1, w=960, y=0, x=0, slice=0, level=0,
mt=0x0) at
../../../../../../../src/mesa/drivers/dri/i965/intel_mipmap_tree.c:2571

This works fine on X11.

Chipset: moble IvyBridge
mesa:4de86e1371b0d59a5b9a787b726be3d373024647
mpv: a8e6de90fee1699c5de89eb1ae2182ceb096a65b
linux: 4.1.4

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