{"action":"created","issue":{"url":"https://api.github.com/repos/zcash/zcash/issues/1397","repository_url":"https://api.github.com/repos/zcash/zcash","labels_url":"https://api.github.com/repos/zcash/zcash/issues/1397/labels{/name}","comments_url":"https://api.github.com/repos/zcash/zcash/issues/1397/comments","events_url":"https://api.github.com/repos/zcash/zcash/issues/1397/events","html_url":"https://github.com/zcash/zcash/issues/1397","id":177023147,"number":1397,"title":"Nodes hanging (block count is not getting updated)","user":{"login":"artlav","id":22204641,"avatar_url":"https://avatars.githubusercontent.com/u/22204641?v=3","gravatar_id":"","url":"https://api.github.com/users/artlav","html_url":"https://github.com/artlav","followers_url":"https://api.github.com/users/artlav/followers","following_url":"https://api.github.com/users/artlav/following{/other_user}","gists_url":"https://api.github.com/users/artlav/gists{/gist_id}","starred_url":"https://api.github.com/users/artlav/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/artlav/subscriptions","organizations_url":"https://api.github.com/users/artlav/orgs","repos_url":"https://api.github.com/users/artlav/repos","events_url":"https://api.github.com/users/artlav/events{/privacy}","received_events_url":"https://api.github.com/users/artlav/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/zcash/zcash/labels/Denial%20of%20Service","name":"Denial of Service","color":"006b75"},{"url":"https://api.github.com/repos/zcash/zcash/labels/needs%20prioritization","name":"needs prioritization","color":"d8ff04"}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-09-14T21:15:01Z","updated_at":"2016-09-15T13:17:22Z","closed_at":null,"body":"I would occasionally find that one or the other machine in the mining cluster shows an old block count (i.e. in getinfo).\r\nTrying to stop or sigterm it makes it just sit there, sometimes consuming 100% of one CPU core, sometimes doing nothing at all.\r\nNothing short of kill -9 helps. Looks almost as if it went into some sort of infinite loop/deadlock inside.\r\nOnce restarted, it keeps working as if nothing happened.\r\n\r\nOne time it happened on Intel(R) Celeron(R) CPU G1620 @ 2.70GHz, 2 Gb RAM, mining on one core.\r\nAnother time was on Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 12 Gb RAM, mining on 4 cores.\r\n\r\nSo there doesn't seem to be any HW dependence."},"comment":{"url":"https://api.github.com/repos/zcash/zcash/issues/comments/247325095","html_url":"https://github.com/zcash/zcash/issues/1397#issuecomment-247325095","issue_url":"https://api.github.com/repos/zcash/zcash/issues/1397","id":247325095,"user":{"login":"artlav","id":22204641,"avatar_url":"https://avatars.githubusercontent.com/u/22204641?v=3","gravatar_id":"","url":"https://api.github.com/users/artlav","html_url":"https://github.com/artlav","followers_url":"https://api.github.com/users/artlav/followers","following_url":"https://api.github.com/users/artlav/following{/other_user}","gists_url":"https://api.github.com/users/artlav/gists{/gist_id}","starred_url":"https://api.github.com/users/artlav/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/artlav/subscriptions","organizations_url":"https://api.github.com/users/artlav/orgs","repos_url":"https://api.github.com/users/artlav/repos","events_url":"https://api.github.com/users/artlav/events{/privacy}","received_events_url":"https://api.github.com/users/artlav/received_events","type":"User","site_admin":false},"created_at":"2016-09-15T13:17:22Z","updated_at":"2016-09-15T13:17:22Z","body":"Here are the logs.\r\nOn 1 it was found hung and stopped on 14th, 10:25\r\nOn 2 it was on 13th, at 12:24 and 21:55, i think i waited for a while before killing it the first time.\r\nOn 3 it was on 13th, at 19:25\r\n\r\nI've started several nodes with zcashd -daemon -debug=1, will post if one happens to hang.\r\n\r\n[cnode_1.log.gz](https://github.com/zcash/zcash/files/474674/cnode_1.log.gz)\r\n[cnode_2.log.gz](https://github.com/zcash/zcash/files/474675/cnode_2.log.gz)\r\n[cnode_3.log.gz](https://github.com/zcash/zcash/files/474676/cnode_3.log.gz)\r\n"}}
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