[Bug 98907] commit bf75ef3 causes Xorg lock-up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98907

            Bug ID: 98907
           Summary: commit bf75ef3 causes Xorg lock-up
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: 375gnu at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

I had Mesa snapshot from 2016/11/09 running fine but with one from 2016/11/25 I
have Xorg lock-up.

 5248 tty7     Dsl+   0:06 /usr/lib/xorg/Xorg -nolisten tcp -auth
/var/run/slim.auth vt07

All other processes run fine, I can connect pc using ssh, but Xorg does not
react to keyboard (C+A+F1, C+A+Bs), so the only way to restore system is
REISUB, even after reboot command the system doesn't reboot, the screen is
blanked so I don't see what's going with it.

I tested this issue only with Black Mesa game from steam.

I can provide the last 20 lines of strace -p <Xorg's pid>, but they look
useless.

After git bisect and patch -R I've found a commit causing this issue:

bf75ef3f9201e11bb08a4d03dab20d5ff86f1ebc

Author: Marek Olšák <marek.olsak at amd.com>  2016-11-15 23:15:55
Committer: Marek Olšák <marek.olsak at amd.com>  2016-11-21 23:44:35
Parent: ef6c84b301ce15022d4907dfb0db5764e31e68f5 (radeonsi: eliminate VS
outputs that aren't used by PS at run
time)
Child:  c5a654786b5b68c5c215e3bd1bc83b02d7e2a0e9 (swr: [rasterizer memory]
minify original sizes for block for
mats)
Branches: debian, master, remotes/origin/master
Follows: 13.0-branchpoint
Precedes: 

    radeonsi: remove all varyings for depth-only rendering or rasterization off

    Tested-by: Edmondo Tommasina <edmondo.tommasina at gmail.com>
    Reviewed-by: Nicolai Hähnle <nicolai.haehnle at amd.com>

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