{"action":"created","issue":{"url":"https://api.github.com/repos/rust-lang/rust/issues/48866","repository_url":"https://api.github.com/repos/rust-lang/rust","labels_url":"https://api.github.com/repos/rust-lang/rust/issues/48866/labels{/name}","comments_url":"https://api.github.com/repos/rust-lang/rust/issues/48866/comments","events_url":"https://api.github.com/repos/rust-lang/rust/issues/48866/events","html_url":"https://github.com/rust-lang/rust/issues/48866","id":303755422,"number":48866,"title":"segfault during stage2 build of dist x86_64-apple-darwin xcode 7.3","user":{"login":"oli-obk","id":332036,"avatar_url":"https://avatars2.githubusercontent.com/u/332036?v=4","gravatar_id":"","url":"https://api.github.com/users/oli-obk","html_url":"https://github.com/oli-obk","followers_url":"https://api.github.com/users/oli-obk/followers","following_url":"https://api.github.com/users/oli-obk/following{/other_user}","gists_url":"https://api.github.com/users/oli-obk/gists{/gist_id}","starred_url":"https://api.github.com/users/oli-obk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/oli-obk/subscriptions","organizations_url":"https://api.github.com/users/oli-obk/orgs","repos_url":"https://api.github.com/users/oli-obk/repos","events_url":"https://api.github.com/users/oli-obk/events{/privacy}","received_events_url":"https://api.github.com/users/oli-obk/received_events","type":"User","site_admin":false},"labels":[{"id":371266501,"url":"https://api.github.com/repos/rust-lang/rust/labels/A-spurious","name":"A-spurious","color":"d7e102","default":false},{"id":650731663,"url":"https://api.github.com/repos/rust-lang/rust/labels/C-bug","name":"C-bug","color":"f5f1fd","default":false},{"id":123111,"url":"https://api.github.com/repos/rust-lang/rust/labels/O-macos","name":"O-macos","color":"6e6ec0","default":false},{"id":211668100,"url":"https://api.github.com/repos/rust-lang/rust/labels/T-compiler","name":"T-compiler","color":"bfd4f2","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2018-03-09T08:00:35Z","updated_at":"2018-03-09T17:54:48Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"So far not reproducible on newer xcode versions.\r\n\r\ncc @varkor @kennytm \r\n\r\nhttps://github.com/rust-lang/rust/commit/52dec0e1c9e0fe5bbbe81385531e69c2c46ef56e obviously did not fix it and can be reverted.\r\n\r\nHappens inside\r\n\r\n```\r\nrustc::ich::hcx::_$LT$impl$u20$rustc_data_structures..stable_hasher..HashStable$LT$rustc..ich..hcx..StableHashingContext$LT$$u27$a$GT$$GT$$u20$for$u20$syntax_pos..span_encoding..Span$GT$::hash_stable::h069c687f17acced0 + 760\r\n```\r\n\r\nwhenever it happens, but it's random during which crate's compilation it happens or whether it occurs at all.\r\n\r\nGuesses so far are\r\n\r\n* alignment issues with `Span`, which is `repr(packed)` and only has a `u32` field\r\n* something to do with the `CACHE` thread_local (just because miri touched statics)\r\n\r\nIs is possible to produce better stacktraces (with line info e.g.) on macs?"},"comment":{"url":"https://api.github.com/repos/rust-lang/rust/issues/comments/371891996","html_url":"https://github.com/rust-lang/rust/issues/48866#issuecomment-371891996","issue_url":"https://api.github.com/repos/rust-lang/rust/issues/48866","id":371891996,"user":{"login":"pietroalbini","id":2299951,"avatar_url":"https://avatars3.githubusercontent.com/u/2299951?v=4","gravatar_id":"","url":"https://api.github.com/users/pietroalbini","html_url":"https://github.com/pietroalbini","followers_url":"https://api.github.com/users/pietroalbini/followers","following_url":"https://api.github.com/users/pietroalbini/following{/other_user}","gists_url":"https://api.github.com/users/pietroalbini/gists{/gist_id}","starred_url":"https://api.github.com/users/pietroalbini/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pietroalbini/subscriptions","organizations_url":"https://api.github.com/users/pietroalbini/orgs","repos_url":"https://api.github.com/users/pietroalbini/repos","events_url":"https://api.github.com/users/pietroalbini/events{/privacy}","received_events_url":"https://api.github.com/users/pietroalbini/received_events","type":"User","site_admin":false},"created_at":"2018-03-09T17:54:48Z","updated_at":"2018-03-09T17:54:48Z","author_association":"CONTRIBUTOR","body":"Also happened on #48757"}}
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