{"action":"opened","issue":{"url":"https://api.github.com/repos/zcash/zcash/issues/4140","repository_url":"https://api.github.com/repos/zcash/zcash","labels_url":"https://api.github.com/repos/zcash/zcash/issues/4140/labels{/name}","comments_url":"https://api.github.com/repos/zcash/zcash/issues/4140/comments","events_url":"https://api.github.com/repos/zcash/zcash/issues/4140/events","html_url":"https://github.com/zcash/zcash/issues/4140","id":495989503,"node_id":"MDU6SXNzdWU0OTU5ODk1MDM=","number":4140,"title":"nWalletDBUpdated is an unlocked global","user":{"login":"daira","id":643204,"node_id":"MDQ6VXNlcjY0MzIwNA==","avatar_url":"https://avatars2.githubusercontent.com/u/643204?v=4","gravatar_id":"","url":"https://api.github.com/users/daira","html_url":"https://github.com/daira","followers_url":"https://api.github.com/users/daira/followers","following_url":"https://api.github.com/users/daira/following{/other_user}","gists_url":"https://api.github.com/users/daira/gists{/gist_id}","starred_url":"https://api.github.com/users/daira/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/daira/subscriptions","organizations_url":"https://api.github.com/users/daira/orgs","repos_url":"https://api.github.com/users/daira/repos","events_url":"https://api.github.com/users/daira/events{/privacy}","received_events_url":"https://api.github.com/users/daira/received_events","type":"User","site_admin":false},"labels":[{"id":152089339,"node_id":"MDU6TGFiZWwxNTIwODkzMzk=","url":"https://api.github.com/repos/zcash/zcash/labels/SECURITY","name":"SECURITY","color":"e01010","default":false},{"id":150272745,"node_id":"MDU6TGFiZWwxNTAyNzI3NDU=","url":"https://api.github.com/repos/zcash/zcash/labels/bug","name":"bug","color":"fc4949","default":true}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2019-09-19T19:38:39Z","updated_at":"2019-09-19T19:38:39Z","closed_at":null,"author_association":"CONTRIBUTOR","body":"The current wallet code uses an unlocked global `nWalletDBUpdated`, defined in `walletdb.cpp`, which is read and written from multiple threads. This is undefined behaviour.\r\n\r\nUpstream has removed this and uses `CScheduler` instead."}}
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