ArrayBuffer and its typed buffer varients like Uint8Array etc.. unlike normal Array cause immediate crash or eat all process memory and and neighbours chickens too.. minimum reproduction steps: as first notticed on ios 6.0.1 safary. immediate crash var a=[]; for (var i=0; i < 1024*1024; i++) a[i]=new ArrayBuffer(1024*1024); on win7: current latest safary 5.1.7 crashes if any page after such script is loaded and window.location after such script didnt load page. on win7 current latest chrome 23.0.1271.97m allocates all process memory in my case (2g) per window/process. opening two such windows via javascript in my case freezes whole os to crawl due to swapping my 4g ram on my laptop hdd. didnt had time to check other platforms but seems like webkit related allocator code. i noticed it due to frequent crashes when working with web audio where buffers are in 1mb ranges or more but lazy gc seems to keeping unused ones around causing fast memory depletion and crashes.