{"action":"opened","issue":{"url":"https://api.github.com/repos/zfsonlinux/zfs/issues/3655","labels_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/3655/labels{/name}","comments_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/3655/comments","events_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/3655/events","html_url":"https://github.com/zfsonlinux/zfs/issues/3655","id":98559665,"number":3655,"title":"Send stuck in D state","user":{"login":"snajpa","id":1138828,"avatar_url":"https://avatars.githubusercontent.com/u/1138828?v=3","gravatar_id":"","url":"https://api.github.com/users/snajpa","html_url":"https://github.com/snajpa","followers_url":"https://api.github.com/users/snajpa/followers","following_url":"https://api.github.com/users/snajpa/following{/other_user}","gists_url":"https://api.github.com/users/snajpa/gists{/gist_id}","starred_url":"https://api.github.com/users/snajpa/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/snajpa/subscriptions","organizations_url":"https://api.github.com/users/snajpa/orgs","repos_url":"https://api.github.com/users/snajpa/repos","events_url":"https://api.github.com/users/snajpa/events{/privacy}","received_events_url":"https://api.github.com/users/snajpa/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-08-01T20:26:51Z","updated_at":"2015-08-01T20:26:51Z","closed_at":null,"body":"Running version at https://github.com/vpsfreecz/zfs (close to master +-).\r\n\r\nWe've switched from our rsync backups to send/recv just today and if this keeps happening, we'll be without back-ups :(\r\n\r\nAny ideas for a quick workaround please?\r\n\r\n```\r\n[root@node9.prg.vpsfree.cz]\r\n ~ # ps aux | grep zfs | grep -v \"\\[\"\r\nroot      487100  0.0  0.0 127492  1388 pts/0    D+   22:16   0:00 zfs send vz/private/802 2015-08-01T18:51:35\r\nroot      487132  0.0  0.0 106100  1140 ?        S    22:16   0:00 sh -c exec zfs send vz/private/802@2015-08-01T18:51:35 | nc 172.16.0.5 10000 2>&1\r\nroot      487133  0.0  0.0 127492  1384 ?        D    22:16   0:00 zfs send vz/private/802 2015-08-01T18:51:35\r\nroot      554088  0.0  0.0 103260   864 pts/3    S+   22:24   0:00 grep zfs\r\n[root@node9.prg.vpsfree.cz]\r\n ~ # cat /proc/487100/stack\r\n[<ffffffffa0251935>] taskq_wait_id+0x65/0xa0 [spl]\r\n[<ffffffffa03042dd>] spa_taskq_dispatch_sync+0x8d/0xc0 [zfs]\r\n[<ffffffffa02cb232>] dump_bytes+0x42/0x50 [zfs]\r\n[<ffffffffa02cb66a>] dump_write+0x20a/0x240 [zfs]\r\n[<ffffffffa02cc96c>] backup_cb+0x71c/0x760 [zfs]\r\n[<ffffffffa02cd2c6>] traverse_visitbp+0x476/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cdce1>] traverse_dnode+0x71/0xd0 [zfs]\r\n[<ffffffffa02cd547>] traverse_visitbp+0x6f7/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cdce1>] traverse_dnode+0x71/0xd0 [zfs]\r\n[<ffffffffa02cd3a1>] traverse_visitbp+0x551/0x7b0 [zfs]\r\n[<ffffffffa02cd784>] traverse_impl+0x184/0x400 [zfs]\r\n[<ffffffffa02cda96>] traverse_dataset+0x56/0x60 [zfs]\r\n[<ffffffffa02cba0b>] dmu_send_impl+0x36b/0x4f0 [zfs]\r\n[<ffffffffa02cc067>] dmu_send_obj+0x197/0x210 [zfs]\r\n[<ffffffffa033a107>] zfs_ioc_send+0xa7/0x280 [zfs]\r\n[<ffffffffa033db25>] zfsdev_ioctl+0x495/0x4d0 [zfs]\r\n[<ffffffff811cb492>] vfs_ioctl+0x22/0xa0\r\n[<ffffffff811cb634>] do_vfs_ioctl+0x84/0x5b0\r\n[<ffffffff811cbbaf>] sys_ioctl+0x4f/0x80\r\n[<ffffffff8100b122>] system_call_fastpath+0x16/0x1b\r\n[<ffffffffffffffff>] 0xffffffffffffffff\r\n[root@node9.prg.vpsfree.cz]\r\n ~ # cat /proc/487133/stack\r\n[<ffffffffa0251935>] taskq_wait_id+0x65/0xa0 [spl]\r\n[<ffffffffa03042dd>] spa_taskq_dispatch_sync+0x8d/0xc0 [zfs]\r\n[<ffffffffa02cb232>] dump_bytes+0x42/0x50 [zfs]\r\n[<ffffffffa02cc59a>] backup_cb+0x34a/0x760 [zfs]\r\n[<ffffffffa02cd2c6>] traverse_visitbp+0x476/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cd23b>] traverse_visitbp+0x3eb/0x7b0 [zfs]\r\n[<ffffffffa02cdce1>] traverse_dnode+0x71/0xd0 [zfs]\r\n[<ffffffffa02cd3a1>] traverse_visitbp+0x551/0x7b0 [zfs]\r\n[<ffffffffa02cd784>] traverse_impl+0x184/0x400 [zfs]\r\n[<ffffffffa02cda96>] traverse_dataset+0x56/0x60 [zfs]\r\n[<ffffffffa02cba0b>] dmu_send_impl+0x36b/0x4f0 [zfs]\r\n[<ffffffffa02cc067>] dmu_send_obj+0x197/0x210 [zfs]\r\n[<ffffffffa033a107>] zfs_ioc_send+0xa7/0x280 [zfs]\r\n[<ffffffffa033db25>] zfsdev_ioctl+0x495/0x4d0 [zfs]\r\n[<ffffffff811cb492>] vfs_ioctl+0x22/0xa0\r\n[<ffffffff811cb634>] do_vfs_ioctl+0x84/0x5b0\r\n[<ffffffff811cbbaf>] sys_ioctl+0x4f/0x80\r\n[<ffffffff8100b122>] system_call_fastpath+0x16/0x1b\r\n[<ffffffffffffffff>] 0xffffffffffffffff\r\n```"}}