debuginfo: Add timeout for LLDB tests.

[michaelwoerister]

If a test takes longer than 10 seconds it will be aborted now, which should prevent the build infrastructure from being blocked for a full hour if an LLDB freeze happens.

Since, as far as I've seen, the freezing happens very rarely and at random tests, we could also get fancy and automatically retry running the tests a few times if it was aborted due to a timeout. That would be quite nice actually.

cc @alexcrichton

[alexcrichton]

Are we sure that all tests should finish under 10s? That seems somewhat conservative, I'd be ok giving them all at least 5 minutes (it's better than an hour!) just in case the system is under high load.

[michaelwoerister]

For testing I used 1s and all of them finished in time. But it's the exceptional case anyway, so 5 minutes should be fine too. Any thoughts regarding the automatic retrying? That would solve the problem completely, I guess.

[alexcrichton]

I'm always somewhat wary of the auto-retry because it may end up accidentally pasting over real issues. For now let's see if we maybe get some extra debugging information if the process doesn't hang (and even prints something out!), and if it happens frequently we can implement the auto-retry.

Also if everything finished well under 1s then 10s is probably plenty. Maybe up it to 30 to be safe and call it a day?

[michaelwoerister]

Maybe up it to 30 to be safe and call it a day?

Deal.