[Bug 31391] New: Heroes of Newerth crashes with cs parser error

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31391

           Summary: Heroes of Newerth crashes with cs parser error
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: stephan@ehilb.de


The game Heroes of Newerth (also referred to as HoN) crashes in certain
circumstances with the following error message in dmesg:

[ 1797.294324] [drm:radeon_cs_parser_init] *ERROR* cs IB too big: 26607
[ 1797.294327] [drm:radeon_cs_ioctl] *ERROR* Failed to initialize parser !

It's occuring during normal gameplay in situations with high graphic workload
(as far as I can tell).
I was up until recently using older libs for playing HoN with the r600 driver
and thus noticed this bug as a regression.
It is possible to reproduce the bug quite reliably by following these steps:

1. Start HoN
2. Create a practice game
3. Select a slot and start the game
4. Select any hero and wait for the countdown or skip the countdown by pressing
ready
5. As the game starts, open the test-menu at the top left of the screen and
press the “Spawn”-button right of where it reads “Creeps” multiple times
(~20-30 times). There should be spawning many creeps at your base.
6. Pan the viewport to include as many creeps as possible.
7. Press the “Kill”-button right next to the “Spawn”-button.
8. 1-2 seconds later the game crashes.
9. You notice the error messages in dmesg

Bisecting issued the following bad commit:

e62e5b0922b6554431234a8a71c7aec7cff91864 is the first bad commit
commit e62e5b0922b6554431234a8a71c7aec7cff91864
Author: Andre Maasikas <amaasikas@gmail.com>
Date:   Wed Aug 11 14:30:18 2010 +0300

    r600: add support for draw_elements_base_vertex

    use VTX_BASE_VTX_LOC for offset, last time using INDEX_OFFSET was
    probably a wrong register for this

:040000 040000 2daa2236ba96c969c80cd62b1199d0eacb56ecce
376ee1345c8cbbb51c2b1c36cb7adafac276d5d6 M    src

I tried to the best of my ability to manually revert the commit and it proved
to be the cause of the bug.
I'm running mesa-git right now with that commit manually reverted and HoN is
running fine.

Note: This might be the same bug as described in this comment:
https://bugs.freedesktop.org/show_bug.cgi?id=25114#c7

Let me know if there is any information missing.

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