[Bug 99285] Total War: Warhammer hang on campaign map

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99285

            Bug ID: 99285
           Summary: Total War: Warhammer hang on campaign map
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jlegg at feralinteractive.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 128775
  --> https://bugs.freedesktop.org/attachment.cgi?id=128775&action=edit
save game

In the Total War: Warhammer campaign mode, leaving the game running for a long
time while showing the campaign map can result in a hang when using an AMD Rx
480. It can take an hour or more to reproduce.

When the hang occurs, the entire system becomes unresponsive, so I am unable to
gather any information about its state over ssh for example. As I can't
diagnose what happened after the event, or practically step through what goes
on immediately before it, I'm out of ideas for debugging it, so any advice
would be appreciated.

Seen in Mesa 13.0.1, and git b18cd8c, 0f2e9a8, and cb6f49a on Ubuntu.
We also tried leaving a machine with an R9 290 running overnight, but that had
not reproduced the hang by the following morning.

Steps to reproduce:
1) Place the attached save game file in path
~/.local/share/feral-interactive/Total War
Warhammer/VFS/User/AppData/Roaming/The Creative
Assembly/Warhammer/save_games/dwarfs 73.save
2) Launch Total War: Warhammer from the Steam client
3) On the main menu, select Campaigns
4) Select Load Campaign
5) Select Load
6) Leave until display freezes (we've seen it take about an hour, but we
typically leave it overnight and find it hung in the morning).

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