Here is a crash log: https://gist.github.com/mjevans/ee929957555d2b93e4c6

Checking again after a cold boot this morning, BuildID: 708143 still has this same issue with the Radeon driver that the maintainers in my distribution feel is 'stable' (I have heard that there are a number of undesirable issues with the more recently released 'beta' version).

Have you also mentioned this to the Terraria devs?

This is the only place I know of to post this. If there were a function for reporting a bug/lockup via steam (it doesn't detect this as a crash since the game live-locks) I'd use it. If there were a list here I'd use that.

Very strangely, the build hasn't updated, and I don't recall having restarted (only suspended/resumed) within the last day, but for some reason Terraria Linux Beta build 708143 actually was working today.

Even more confusingly, previously it should have had better access to system resources, as /that/ test was right after a cold boot, while now I've played Minecraft and reloaded (too many) Chrome/Chromium tabs.

A way of collecting more concrete data, particularly on graphics sub-system resources at the time of the error, seems desirable.

I decided to try again while watching a video... livelocked again.

https://gist.github.com/mjevans/172f92a2b4ed3d062024

The crashes seem fairly frequent, and the game now exits on lockup after I installed gdb.

I've also actually looked (since no one helpfully linked) and after waiting for my request to join the 'user community' posted the bug report there too: http://forums.terraria.org/index.php?threads/crash-lockup-just-after-loading-world-drawing-failure-in-libmonosgen-2-0-s0-opengldevice-glenum.28340/

The fourth beta of this game, buildID: 710313 seems to have, probably, fixed the issue.

I haven't been able to repeat it, but I'll test it again with some more intense videos to make sure.

I'm willing to believe that the update fixed this issue.