{"action":"closed","issue":{"url":"https://api.github.com/repos/mozilla/rr/issues/1576","labels_url":"https://api.github.com/repos/mozilla/rr/issues/1576/labels{/name}","comments_url":"https://api.github.com/repos/mozilla/rr/issues/1576/comments","events_url":"https://api.github.com/repos/mozilla/rr/issues/1576/events","html_url":"https://github.com/mozilla/rr/issues/1576","id":114683469,"number":1576,"title":"Assertion failure in AddressSpace::coalesce_around on Ubuntu 14.04 VM","user":{"login":"evincarofautumn","id":729779,"avatar_url":"https://avatars.githubusercontent.com/u/729779?v=3","gravatar_id":"","url":"https://api.github.com/users/evincarofautumn","html_url":"https://github.com/evincarofautumn","followers_url":"https://api.github.com/users/evincarofautumn/followers","following_url":"https://api.github.com/users/evincarofautumn/following{/other_user}","gists_url":"https://api.github.com/users/evincarofautumn/gists{/gist_id}","starred_url":"https://api.github.com/users/evincarofautumn/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/evincarofautumn/subscriptions","organizations_url":"https://api.github.com/users/evincarofautumn/orgs","repos_url":"https://api.github.com/users/evincarofautumn/repos","events_url":"https://api.github.com/users/evincarofautumn/events{/privacy}","received_events_url":"https://api.github.com/users/evincarofautumn/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":4,"created_at":"2015-11-02T21:04:34Z","updated_at":"2015-11-03T02:50:23Z","closed_at":"2015-11-03T02:50:23Z","body":"I am trying to run `rr record` on an Ubuntu 14.04 VM with two processors running under VMWare Fusion 6.06. Whether using a binary release or building from `master`, I get the following output:\r\n\r\n```\r\nrr: /home/jonathanpurdy/rr/src/AddressSpace.cc:1278: void AddressSpace::coalesce_around(std::map<MemoryRange, AddressSpace::Mapping, MappingComparator>::iterator): Assertion `last_kv != mem.end()' failed.\r\n```\r\n\r\nBased on a cursory reading of `coalesce_around`, it seems this assertion is correct, and has been present in the code for a long while. What should I try next? I can provide any information necessary.\r\n\r\nOutput of `uname -a`:\r\n\r\n```\r\nLinux ubuntu 3.13.0-49-generic #83-Ubuntu SMP Fri Apr 10 20:11:33 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux\r\n```\r\n\r\nI don’t know if this is relevant, but the process I am attempting to debug with `rr` does not crash—it exhibits wrong behaviour but exits successfully.\r\n"}}