{"action":"opened","issue":{"url":"https://api.github.com/repos/JuliaLang/julia/issues/11627","labels_url":"https://api.github.com/repos/JuliaLang/julia/issues/11627/labels{/name}","comments_url":"https://api.github.com/repos/JuliaLang/julia/issues/11627/comments","events_url":"https://api.github.com/repos/JuliaLang/julia/issues/11627/events","html_url":"https://github.com/JuliaLang/julia/issues/11627","id":86459361,"number":11627,"title":"Invalid reads in ios_write during bootstrap under valgrind","user":{"login":"garrison","id":91987,"avatar_url":"https://avatars.githubusercontent.com/u/91987?v=3","gravatar_id":"","url":"https://api.github.com/users/garrison","html_url":"https://github.com/garrison","followers_url":"https://api.github.com/users/garrison/followers","following_url":"https://api.github.com/users/garrison/following{/other_user}","gists_url":"https://api.github.com/users/garrison/gists{/gist_id}","starred_url":"https://api.github.com/users/garrison/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/garrison/subscriptions","organizations_url":"https://api.github.com/users/garrison/orgs","repos_url":"https://api.github.com/users/garrison/repos","events_url":"https://api.github.com/users/garrison/events{/privacy}","received_events_url":"https://api.github.com/users/garrison/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-06-09T05:41:27Z","updated_at":"2015-06-09T05:41:27Z","closed_at":null,"body":"I run the bootstrap of the current julia `master` under valgrind with an empty `Make.user`:\r\n\r\n    $ valgrind -q --smc-check=all --suppressions=$PWD/contrib/valgrind-julia.supp --trace-children=yes make\r\n\r\nA handful of error messages appear that look something like this:\r\n\r\n    ==13922== Invalid read of size 2\r\n    ==13922==    at 0x4C2D988: memcpy@@GLIBC_2.14 (vg_replace_strmem.c:915)\r\n    ==13922==    by 0x4F9D58B: ios_write (ios.c:403)\r\n    ==13922==    by 0x4F6E89D: jl_serialize_value_ (dump.c:647)\r\n\r\nThe [full output is here](https://gist.github.com/garrison/a279ec15ab889e6ab7a6).\r\n\r\n`git bisect` suggests this issue began with afa1404."}}