Thanks for this. Here's what I get:
[<ffffffffc084ba73>] transaction_kthread+0x133/0x1c0 [btrfs]
[<ffffffffaa09b839>] kthread+0x109/0x140
[<ffffffffaa8459f5>] ret_from_fork+0x25/0x30
...
[<ffffffffaa0a8406>] io_schedule+0x16/0x40
[<ffffffffaa3b3cde>] get_request+0x23e/0x720
[<ffffffffaa3b6861>] blk_queue_bio+0xc1/0x3a0
[<ffffffffaa3b4a88>] generic_make_request+0xf8/0x2a0
[<ffffffffaa3b4ca5>] submit_bio+0x75/0x150
[<ffffffffc087fac5>] btrfs_map_bio+0xe5/0x2f0 [btrfs]
[<ffffffffc084834c>] btree_submit_bio_hook+0x8c/0xe0 [btrfs]
[<ffffffffc086f1e3>] submit_one_bio+0x63/0xa0 [btrfs]
[<ffffffffc086f39b>] flush_epd_write_bio+0x3b/0x50 [btrfs]
[<ffffffffc086f3be>] flush_write_bio+0xe/0x10 [btrfs]
[<ffffffffc08777a9>] btree_write_cache_pages+0x379/0x450 [btrfs]
[<ffffffffc08478ed>] btree_writepages+0x5d/0x70 [btrfs]
[<ffffffffaa1a326c>] do_writepages+0x1c/0x70
[<ffffffffaa196f2a>] __filemap_fdatawrite_range+0xaa/0xe0
[<ffffffffaa197023>] filemap_fdatawrite_range+0x13/0x20
[<ffffffffc084fba9>] btrfs_write_marked_extents+0xe9/0x110 [btrfs]
[<ffffffffc084fc4d>] btrfs_write_and_wait_transaction.isra.22+0x3d/0x80
[btrfs]
[<ffffffffc0851645>] btrfs_commit_transaction+0x665/0x900 [btrfs]
...
[<ffffffffaa0a8406>] io_schedule+0x16/0x40
[<ffffffffaa1959c8>] wait_on_page_bit+0xe8/0x120
[<ffffffffc087639d>] read_extent_buffer_pages+0x1cd/0x2e0 [btrfs]
[<ffffffffc0846fcf>] btree_read_extent_buffer_pages+0x9f/0x100 [btrfs]
[<ffffffffc0848542>] read_tree_block+0x32/0x50 [btrfs]
[<ffffffffc0828980>] read_block_for_search.isra.32+0x120/0x2e0 [btrfs]
[<ffffffffc082daa5>] btrfs_next_old_leaf+0x215/0x400 [btrfs]
[<ffffffffc082dca0>] btrfs_next_leaf+0x10/0x20 [btrfs]
[<ffffffffc0843c3e>] btrfs_lookup_csums_range+0x12e/0x410 [btrfs]
[<ffffffffc08d09ea>] csum_exist_in_range.isra.49+0x2a/0x81 [btrfs]
[<ffffffffc08596a2>] run_delalloc_nocow+0x9b2/0xa10 [btrfs]
[<ffffffffc0859768>] run_delalloc_range+0x68/0x340 [btrfs]
[<ffffffffc0872070>] writepage_delalloc.isra.47+0xf0/0x140 [btrfs]
[<ffffffffc0872f97>] __extent_writepage+0xc7/0x290 [btrfs]
[<ffffffffc0873415>] extent_write_cache_pages.constprop.53+0x2b5/0x450
[btrfs]
[<ffffffffc0874fed>] extent_writepages+0x4d/0x70 [btrfs]
[<ffffffffc0852d88>] btrfs_writepages+0x28/0x30 [btrfs]
[<ffffffffaa1a326c>] do_writepages+0x1c/0x70
[<ffffffffaa196f2a>] __filemap_fdatawrite_range+0xaa/0xe0
[<ffffffffaa197023>] filemap_fdatawrite_range+0x13/0x20
[<ffffffffc08695c0>] btrfs_fdatawrite_range+0x20/0x50 [btrfs]
[<ffffffffc089abf9>] __btrfs_write_out_cache+0x3d9/0x420 [btrfs]
[<ffffffffc089b066>] btrfs_write_out_cache+0x86/0x100 [btrfs]
[<ffffffffc083bc61>] btrfs_write_dirty_block_groups+0x261/0x390 [btrfs]
[<ffffffffc084e83b>] commit_cowonly_roots+0x1fb/0x290 [btrfs]
[<ffffffffc0851414>] btrfs_commit_transaction+0x434/0x900 [btrfs]
...
[<ffffffffc08992d7>] tree_search_offset.isra.23+0x37/0x1d0 [btrfs]
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