Update: The Safari crash bug has now been fixed - according to APPLE
A strange bug is affecting many Safari users today, causing crashes on iPhone, iPad and Mac. For many users, simply tapping in the URL bar will cause the browser app to crash completely. The exact issue causing the crashing has not been locked down, but it appears to be related to Apple’s Safari Suggestions service. It’s a very annoying bug that is affecting a lot of people all of sudden today. When you type a URL, Apple sends what you type to its servers, returning a response with autocomplete search queries, Top Sites and other info. There appears to be a bug in this server request that is causing Safari to randomly crash. Users are discovering some potential workarounds until Apple fixes the problem properly … Disabling Safari Suggestions seems to be helping resolve the bug for many people on iOS. On your iPhone or iPad, go into Settings, tap Safari, and toggle off the ‘Safari Suggestions’ switch. This will fix the crashing, obviously its only a temporary fix until Apple sorts its servers out as it will disable the Safari Suggestions functionality. Another option is to enter Private Browsing mode. In private browsing, by design Safari does not contact the suggestions server for intelligent completion options, so the server is never contacted and the crash never arises.