Segfault on OSX after llvm-dsymutil segfault

[aidanhs]

rust-lang/rust#47000 (comment)

Log at https://api.travis-ci.org/v3/job/321678421/log.txt

If you search for "Date/Time:" (each result is a crash report generated turing the travis job), you can see two segfaults of /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/llvm-dsymutil and then sccache crashes.

Of possible interest:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread

0   sccache                       	0x00000001088179a3 std::sys_common::thread_info::set::h2a8735518479c578 + 3

1   sccache                       	0x000000010856d264 start + 52

There's even register info in there so I guess you could use rip to look up the exact instruction/what it was trying to do at the time of crash.

I don't think we've seen if before and don't know if it's even sccache's fault, but wanted to report it at least.