So... I was reproducing this again via the root shell from the Ubuntu rescue mode menu and some time after LLVM's compilation starts, I start to see lots of these:
BUG: soft lockup - CPU#0 stuck for 61s [cc1plus3655] -- System freezes when doing heavy IO in Jaunty with ext4 https://bugs.launchpad.net/bugs/353451 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs