{"action":"opened","issue":{"url":"https://api.github.com/repos/zfsonlinux/zfs/issues/5396","repository_url":"https://api.github.com/repos/zfsonlinux/zfs","labels_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/5396/labels{/name}","comments_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/5396/comments","events_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/5396/events","html_url":"https://github.com/zfsonlinux/zfs/issues/5396","id":189181731,"number":5396,"title":"dbuf_create() VERIFY(dn->dn_type != DMU_OT_NONE) failed","user":{"login":"behlendorf","id":148917,"avatar_url":"https://avatars.githubusercontent.com/u/148917?v=3","gravatar_id":"","url":"https://api.github.com/users/behlendorf","html_url":"https://github.com/behlendorf","followers_url":"https://api.github.com/users/behlendorf/followers","following_url":"https://api.github.com/users/behlendorf/following{/other_user}","gists_url":"https://api.github.com/users/behlendorf/gists{/gist_id}","starred_url":"https://api.github.com/users/behlendorf/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/behlendorf/subscriptions","organizations_url":"https://api.github.com/users/behlendorf/orgs","repos_url":"https://api.github.com/users/behlendorf/repos","events_url":"https://api.github.com/users/behlendorf/events{/privacy}","received_events_url":"https://api.github.com/users/behlendorf/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-11-14T17:59:44Z","updated_at":"2016-11-14T17:59:44Z","closed_at":null,"body":"Observed while testing with roughly 100 concurrent dbench threads.\r\n\r\n```\r\nVERIFY(dn->dn_type != DMU_OT_NONE) failed\r\nPANIC at dbuf.c:2347:dbuf_create()\r\nShowing stack for process 104709\r\nCPU: 10 PID: 104709 Comm: dbench Tainted: P           OE  ------------   3.10.0-510.0.0.2chaos+2.g956a12a.2016111653.ch6.x86_64 #1\r\nHardware name: Intel Corporation S2600WTTR/S2600WTTR, BIOS SE5C610.86B.01.01.0016.033120161139 03/31/2016\r\n ffffffffa0ce8958 00000000339ea79b ffff8815641afa48 ffffffff8169c1d5\r\n ffff8815641afa58 ffffffffa0560de4 ffff8815641afbe0 ffffffffa0560eaf\r\n ffff881cfc164080 ffff880600000028 ffff8815641afbf0 ffff8815641afb90\r\nCall Trace:\r\n [<ffffffff8169c1d5>] dump_stack+0x19/0x1b\r\n [<ffffffffa0560de4>] spl_dumpstack+0x44/0x50 [spl]\r\n [<ffffffffa0560eaf>] spl_panic+0xbf/0xf0 [spl]\r\n [<ffffffff816aedb1>] ? ftrace_call+0x5/0x2f\r\n [<ffffffffa0bf4e46>] ? refcount_remove+0x16/0x20 [zfs]\r\n [<ffffffffa0b973d8>] ? dbuf_rele_and_unlock+0x1f8/0x5c0 [zfs]\r\n [<ffffffff816aedb1>] ? ftrace_call+0x5/0x2f\r\n [<ffffffffa0b9683e>] dbuf_create+0x7ae/0x7e0 [zfs]\r\n [<ffffffff816aedb1>] ? ftrace_call+0x5/0x2f\r\n [<ffffffff816aedb1>] ? ftrace_call+0x5/0x2f\r\n [<ffffffffa0bc038f>] ? dnode_hold_impl+0x47f/0x9d0 [zfs]\r\n [<ffffffffa0b968ae>] dbuf_create_bonus+0x3e/0xa0 [zfs]\r\n [<ffffffffa0ba48f0>] dmu_bonus_hold+0x1b0/0x280 [zfs]\r\n [<ffffffffa0bf6e4e>] sa_buf_hold+0xe/0x10 [zfs]\r\n [<ffffffffa0c6f349>] zfs_zget+0x119/0x2b0 [zfs]\r\n [<ffffffffa0c690d3>] zfs_get_data+0x73/0x500 [zfs]\r\n [<ffffffffa0c758fc>] zil_commit_writer+0x62c/0xae0 [zfs]\r\n [<ffffffffa0c75e4d>] zil_commit.part.10+0x9d/0x130 [zfs]\r\n [<ffffffffa0c75ef7>] zil_commit+0x17/0x20 [zfs]\r\n [<ffffffffa0c65d6a>] zfs_fsync+0x7a/0xf0 [zfs]\r\n [<ffffffffa0c892a7>] zpl_fsync+0x87/0x120 [zfs]\r\n [<ffffffff81239b05>] do_fsync+0x65/0xa0\r\n [<ffffffff81239dd0>] SyS_fsync+0x10/0x20\r\n [<ffffffff816ad089>] system_call_fastpath+0x16/0x1b\r\nINFO: task dbench:71980 blocked for more than 120 seconds.\r\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\r\ndbench          D ffff882010b5e028     0 71980  71908 0x00000080\r\n ffff8803fee93e00 0000000000000086 ffff8803fee93fd8 ffff8810306c9f60\r\n ffff8803fee93fd8 ffff8803fee93fd8 ffff8810306c9f60 ffff882010b5e1c0\r\n ffff882010b5e000 ffff882010b5e1c8 0000000000000000 ffff882010b5e028\r\nCall Trace:\r\n [<ffffffff816a1b39>] schedule+0x29/0x70\r\n [<ffffffffa056362d>] cv_wait_common+0x14d/0x2a0 [spl]\r\n [<ffffffff810b4640>] ? wake_up_atomic_t+0x30/0x30\r\n [<ffffffffa0563795>] __cv_wait+0x15/0x20 [spl]\r\n [<ffffffffa0c75e1b>] zil_commit.part.10+0x6b/0x130 [zfs]\r\n [<ffffffffa0c75ef7>] zil_commit+0x17/0x20 [zfs]\r\n [<ffffffffa0c65d6a>] zfs_fsync+0x7a/0xf0 [zfs]\r\n [<ffffffffa0c892a7>] zpl_fsync+0x87/0x120 [zfs]\r\n [<ffffffff81239b05>] do_fsync+0x65/0xa0\r\n [<ffffffff81239dd0>] SyS_fsync+0x10/0x20\r\n [<ffffffff816ad089>] system_call_fastpath+0x16/0x1b\r\n```"}}
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