[Bug 98028] Guns of Icarus Online segfaults on startup since AMDGPU: Partially fix control flow at -O0

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Bug ID 98028
Summary Guns of Icarus Online segfaults on startup since AMDGPU: Partially fix control flow at -O0
Product Mesa
Version git
Hardware Other
OS All
Status NEW
Severity normal
Priority medium
Component Drivers/Gallium/radeonsi
Assignee dri-devel@lists.freedesktop.org
Reporter daniel@constexpr.org
QA Contact dri-devel@lists.freedesktop.org

Created attachment 126970 [details]
Short Guns of Icarus Online startup trace (truncated by segfault)

Guns of Icarus Online segfaults (or sometimes hangs) on startup with current
Mesa and LLVM. I have bisected the segfault to LLVM r282667.

The backtraces for the segfaults vary. Some of the segfaults are inside malloc
/ free, indicating possible memory corruption.

I have attached an apitrace recorded using a bad LLVM revision. While the game
consistently segfaults (or hangs), replaying the trace does not result in a
segfault every time.

Here is also a longer trace of the full startup sequence recorded using a good
LLVM revision:
 http://constexpr.org/tmp/GoIO-radeonsi.2.trace.xz (82 MiB)

GPU: R9 380X
Kernel: 4.7.5-gentoo
Mesa: git-024c207
LLVM: r283076


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