Wednesday, 24 February 2016

"These Bugs Are Impossible To Fix Without rr"

Jan de Mooij and the Mozilla JS team just used rr to figure out a GC-related top-crash in Firefox Nightly. The IRC discussion starts here.

I think rr is great for most kinds of bugs, not just the really hard ones. But obviously hard bugs are where there's the most win to be had.

Posted by Robert at 10:45
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4 comments:

  1. Simon Lindholm24 February 2016 at 13:40

    A more permanent link to the IRC discussion: http://logs.glob.uno/?c=mozilla%23jsapi&s=23+Feb+2016&e=23+Feb+2016#c701602

    ReplyDelete
  2. Daniel24 February 2016 at 16:37

    Me: What is rr? I haven’t heard of it before. (Note: I came to this blog from a link to Rewrite Everything In Rust just a few minutes ago)
    *googles*
    Me: That EXISTS? Why have I not heard about this before? Why have I not been using this for years? This changes everything.

    Thank you for creating such an amazing-looking tool.

    ReplyDelete
  3. Steve Fink25 February 2016 at 05:34

    @Daniel because it hasn't existed for years, of course! (though I think Microsoft has something similar maybe sorta?)

    By the way, does rr work with Rust? I mean, I know it should accurately record and replay execution since I assume Rust doesn't make completely oddball syscalls or anything. I guess what I'm really asking is if *gdb* works with Rust.

    ReplyDelete
    Replies
    1. Robert25 February 2016 at 07:26

      Yes it does. mbrubeck is apparently using rr to track down Servo intermittents.

      Delete

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