{"action":"closed","issue":{"url":"https://api.github.com/repos/zfsonlinux/zfs/issues/4121","labels_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/4121/labels{/name}","comments_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/4121/comments","events_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/4121/events","html_url":"https://github.com/zfsonlinux/zfs/issues/4121","id":122970652,"number":4121,"title":"creating snapshots causes activity to stall for 30 minutes","user":{"login":"RichardSharpe","id":947462,"avatar_url":"https://avatars.githubusercontent.com/u/947462?v=3","gravatar_id":"","url":"https://api.github.com/users/RichardSharpe","html_url":"https://github.com/RichardSharpe","followers_url":"https://api.github.com/users/RichardSharpe/followers","following_url":"https://api.github.com/users/RichardSharpe/following{/other_user}","gists_url":"https://api.github.com/users/RichardSharpe/gists{/gist_id}","starred_url":"https://api.github.com/users/RichardSharpe/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/RichardSharpe/subscriptions","organizations_url":"https://api.github.com/users/RichardSharpe/orgs","repos_url":"https://api.github.com/users/RichardSharpe/repos","events_url":"https://api.github.com/users/RichardSharpe/events{/privacy}","received_events_url":"https://api.github.com/users/RichardSharpe/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":3,"created_at":"2015-12-18T15:41:11Z","updated_at":"2015-12-23T01:04:02Z","closed_at":"2015-12-23T01:04:02Z","body":"Hi folks,\r\n\r\nWe are using 0.6.5.3-2 and during some recent testing where we ran up 200 Samba clients and was taking snapshots with the auto-snapshots stuff (hourly) we are seeing hangs where ZFS will hang for 30 minutes and then come good.\r\n\r\nSeeing these sorts of stack traces for processes:\r\n\r\n'''\r\n[<ffffffffa03978b5>] cv_wait_common+0x125/0x150 [spl]\r\n[<ffffffffa03978f5>] __cv_wait+0x15/0x20 [spl]\r\n[<ffffffffa04b5f6b>] zfs_dirent_lock+0x18b/0x590 [zfs]\r\n[<ffffffffa04b7bc0>] zfs_get_xattrdir+0x130/0x1c0 [zfs]\r\n[<ffffffffa04cc05d>] zfs_lookup+0x1dd/0x340 [zfs]\r\n[<ffffffffa04ea20e>] __zpl_xattr_get+0x8e/0x2a0 [zfs]\r\n[<ffffffffa04eacf5>] zpl_xattr_get+0x75/0x120 [zfs]\r\n[<ffffffffa04eaf10>] zpl_xattr_security_get+0x50/0x70 [zfs]\r\n[<ffffffff811eb7cc>] generic_getxattr+0x4c/0x70\r\n[<ffffffff81268429>] get_vfs_caps_from_disk+0x69/0x120\r\n[<ffffffff810f5ddd>] audit_copy_inode+0x6d/0xb0\r\n[<ffffffff810fb36a>] __audit_inode+0x18a/0x3c0\r\n[<ffffffff811d561c>] filename_lookup+0x7c/0xc0\r\n[<ffffffff811d8607>] user_path_at_empty+0x67/0xc0\r\n[<ffffffff811d8671>] user_path_at+0x11/0x20\r\n[<ffffffff811cbfa3>] vfs_fstatat+0x63/0xc0\r\n[<ffffffff811cc571>] SYSC_newlstat+0x31/0x60\r\n[<ffffffff811cc7fe>] SyS_newlstat+0xe/0x10\r\n[<ffffffff816150c9>] system_call_fastpath+0x16/0x1b\r\n[<ffffffffffffffff>] 0xffffffffffffffff\r\n'''"}}