On Wed, Jun 21, 2017 at 11:52:36AM -0400, Chris Mason wrote:
 > On 06/21/2017 11:16 AM, Dave Jones wrote:
 > > WARNING: CPU: 2 PID: 7153 at fs/btrfs/ordered-data.c:753 
 > > btrfs_wait_ordered_roots+0x1a3/0x220
 > > CPU: 2 PID: 7153 Comm: kworker/u8:7 Not tainted 4.12.0-rc6-think+ #4
 > > Workqueue: events_unbound btrfs_async_reclaim_metadata_space
 > > task: ffff8804f08d5380 task.stack: ffffc9000895c000
 > > RIP: 0010:btrfs_wait_ordered_roots+0x1a3/0x220
 > > RSP: 0018:ffffc9000895fc70 EFLAGS: 00010286
 > > RAX: 0000000000000000 RBX: 00000000f7efdfb1 RCX: 00000000000025c3
 > > RDX: ffff880507c0cde0 RSI: 0000000000000000 RDI: 0000000000000002
 > > RBP: ffffc9000895fce8 R08: 0000000000000000 R09: 0000000000000001
 > > R10: ffffc9000895fbd8 R11: ffff8804f08d5380 R12: ffff8804f4930008
 > > R13: 0000000000000001 R14: ffff8804f36f0000 R15: ffff8804f4930850
 > > FS:  0000000000000000(0000) GS:ffff880507c00000(0000) 
 > > knlGS:0000000000000000
 > > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 > > CR2: 00007fd40c4a1bf2 CR3: 000000013995e000 CR4: 00000000001406e0
 > > DR0: 00007f17be890000 DR1: 0000000000000000 DR2: 0000000000000000
 > > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
 > > Call Trace:
 > >  flush_space+0x285/0x6e0
 > >  btrfs_async_reclaim_metadata_space+0xd7/0x420
 > >  process_one_work+0x24d/0x680
 > >  worker_thread+0x4e/0x3b0
 > >  kthread+0x117/0x150
 > >  ? process_one_work+0x680/0x680
 > >  ? kthread_create_on_node+0x70/0x70
 > >  ret_from_fork+0x27/0x40
 > 
 > Thanks Dave, which trinity command line triggered this?

nothing too fancy

in a loop..

  trinity -q -C64 -N 100000000 -E SMC -a64

(note you'll need https://lkml.org/lkml/2017/6/20/10 too to survive
 more than a few seconds)

        Dave
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