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