[Bug 101401] [REGRESSION][BISECTED] GDM fails to start after 8ec4975cd83365c791a1

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Bug ID 101401
Summary [REGRESSION][BISECTED] GDM fails to start after 8ec4975cd83365c791a1
Product Mesa
Version git
Hardware All
OS All
Status NEW
Severity major
Priority medium
Component Drivers/Gallium/radeonsi
Assignee dri-devel@lists.freedesktop.org
Reporter awatry@gmail.com
QA Contact dri-devel@lists.freedesktop.org

I rebuilt/installed mesa earlier this evening and not long after, my system
hung.

Upon reboot, the GDM login screen was corrupted and attempts to login caused
gnome-shell to crash almost immediately after.

Hardware: AMD Ryzen R7 1700, Radeon HD 7850 1GB
Software: Ubuntu 17.04 64-bit with LLVM/Mesa from trunk/git.

A bisect run shows this as the culprit:

8ec4975cd83365c791a1852a6515ed5d4ade2daf is the first bad commit
commit 8ec4975cd83365c791a1852a6515ed5d4ade2daf
Author: Dave Airlie <airlied@redhat.com>
Date:   Tue Jun 13 05:33:19 2017 +1000

    st_glsl_to_tgsi: don't try and pass 32-bit values to get_deref_offsets

    Just use a temporary 16-bit index.

    This fixes coverity issue, pointed to me by Ilia.

    Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

:040000 040000 38cec44b25ea12b442370353240f77182c4fd5d6
ae9afe7163541fd192331025f1d8becf9e8942b0 M      src


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