{"action":"created","issue":{"url":"https://api.github.com/repos/kdave/btrfs-progs/issues/84","repository_url":"https://api.github.com/repos/kdave/btrfs-progs","labels_url":"https://api.github.com/repos/kdave/btrfs-progs/issues/84/labels{/name}","comments_url":"https://api.github.com/repos/kdave/btrfs-progs/issues/84/comments","events_url":"https://api.github.com/repos/kdave/btrfs-progs/issues/84/events","html_url":"https://github.com/kdave/btrfs-progs/issues/84","id":282750673,"number":84,"title":"btrfs check, backref.c:466: __add_missing_keys: Assertion `ref->root_id` failed, value 0","user":{"login":"cmurf","id":10091077,"avatar_url":"https://avatars2.githubusercontent.com/u/10091077?v=4","gravatar_id":"","url":"https://api.github.com/users/cmurf","html_url":"https://github.com/cmurf","followers_url":"https://api.github.com/users/cmurf/followers","following_url":"https://api.github.com/users/cmurf/following{/other_user}","gists_url":"https://api.github.com/users/cmurf/gists{/gist_id}","starred_url":"https://api.github.com/users/cmurf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cmurf/subscriptions","organizations_url":"https://api.github.com/users/cmurf/orgs","repos_url":"https://api.github.com/users/cmurf/repos","events_url":"https://api.github.com/users/cmurf/events{/privacy}","received_events_url":"https://api.github.com/users/cmurf/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2017-12-18T02:49:08Z","updated_at":"2017-12-20T18:50:28Z","closed_at":null,"author_association":"NONE","body":"$ git branch -v\r\n* master 9fe889ac Btrfs progs v4.14\r\n\r\nI'm getting a crash whenever I use btrfs check --mode=lowmem. It doesn't happen without lowmem.\r\n\r\n[chris@f27s btrfs-progs]$ sudo ./btrfs check --mode=lowmem /dev/mapper/first\r\nChecking filesystem on /dev/mapper/first\r\nUUID: 0f43f49d-6e63-4b1b-bc8c-c54da409872d\r\nchecking extents\r\nbackref.c:466: __add_missing_keys: Assertion `ref->root_id` failed, value 0\r\n./btrfs[0x4335ef]\r\n./btrfs[0x433f03]\r\n./btrfs[0x434db2]\r\n./btrfs(btrfs_find_all_roots+0x9)[0x434e02]\r\n./btrfs[0x4506bc]\r\n./btrfs[0x459ed0]\r\n./btrfs(cmd_check+0x2634)[0x4617ee]\r\n./btrfs(main+0x88)[0x40b61d]\r\n/lib64/libc.so.6(__libc_start_main+0xea)[0x7f6e83a8103a]\r\n./btrfs(_start+0x2a)[0x40b1ea]\r\nAborted\r\n\r\n\r\nAttaching file containing versions of everything and the build steps.\r\n\r\n[btrfs check 4.14 crash.txt](https://github.com/kdave/btrfs-progs/files/1566460/btrfs.check.4.14.crash.txt)\r\n"},"comment":{"url":"https://api.github.com/repos/kdave/btrfs-progs/issues/comments/353149915","html_url":"https://github.com/kdave/btrfs-progs/issues/84#issuecomment-353149915","issue_url":"https://api.github.com/repos/kdave/btrfs-progs/issues/84","id":353149915,"user":{"login":"cmurf","id":10091077,"avatar_url":"https://avatars2.githubusercontent.com/u/10091077?v=4","gravatar_id":"","url":"https://api.github.com/users/cmurf","html_url":"https://github.com/cmurf","followers_url":"https://api.github.com/users/cmurf/followers","following_url":"https://api.github.com/users/cmurf/following{/other_user}","gists_url":"https://api.github.com/users/cmurf/gists{/gist_id}","starred_url":"https://api.github.com/users/cmurf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cmurf/subscriptions","organizations_url":"https://api.github.com/users/cmurf/orgs","repos_url":"https://api.github.com/users/cmurf/repos","events_url":"https://api.github.com/users/cmurf/events{/privacy}","received_events_url":"https://api.github.com/users/cmurf/received_events","type":"User","site_admin":false},"created_at":"2017-12-20T18:50:28Z","updated_at":"2017-12-20T18:50:28Z","author_association":"NONE","body":"It is fixed in https://github.com/adam900710/btrfs-progs lowmem_fix branch. And also in kdave devel branch. Both still have the problem with what looks like bogus backref lost errors.\r\nhttps://www.spinics.net/lists/linux-btrfs/msg72755.html"}}
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