Ядро 3.17.1 x86_64. Монтируем btrfs с опцией compress-force=lzo и пишем в 2-3 потока всего лишь на скорости гигабитной сетки. Через 10-30 минут (как повезёт), система наглухо виснет вот с таким выхлопом:
Call Trace:
Nov 3 03:21:49 DRIVE kernel: [ 859.630880] [<ffffffff817a3e05>] _raw_write_lock+0x25/0x30
Nov 3 03:21:49 DRIVE kernel: [ 859.630888] [<ffffffffc01be3a9>] btrfs_tree_lock+0xc9/0x1d0 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630891] [<ffffffff810b3eb0>] ? add_wait_queue+0x60/0x60
Nov 3 03:21:49 DRIVE kernel: [ 859.630896] [<ffffffffc015b92b>] btrfs_lock_root_node+0x3b/0x50 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630901] [<ffffffffc0160dd7>] btrfs_search_slot+0x787/0x880 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630907] [<ffffffffc0178048>] btrfs_lookup_file_extent+0x38/0x40 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630914] [<ffffffffc01983f1>] __btrfs_drop_extents+0x151/0xdf0 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630915] [<ffffffff8109da1c>] ? ttwu_do_wakeup+0x2c/0x100
Nov 3 03:21:49 DRIVE kernel: [ 859.630917] [<ffffffff811cd773>] ? kmem_cache_alloc+0x1b3/0x1f0
Nov 3 03:21:49 DRIVE kernel: [ 859.630922] [<ffffffffc015b3ba>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630926] [<ffffffffc015b3ba>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630932] [<ffffffffc018867b>] insert_reserved_file_extent.constprop.64+0xab/0x310 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630938] [<ffffffffc0185880>] ? start_transaction.part.35+0x80/0x530 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630944] [<ffffffffc018ee35>] btrfs_finish_ordered_io+0x475/0x580 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630951] [<ffffffffc01cd6d1>] ? end_compressed_bio_write+0x31/0xf0 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630957] [<ffffffffc018ef55>] finish_ordered_fn+0x15/0x20 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630964] [<ffffffffc01b49ae>] normal_work_helper+0x7e/0x1b0 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630971] [<ffffffffc01b4c52>] btrfs_endio_write_helper+0x12/0x20 [btrfs]
Nov 3 03:21:49 DRIVE kernel: [ 859.630972] [<ffffffff8108ce2e>] process_one_work+0x14e/0x460
Nov 3 03:21:49 DRIVE kernel: [ 859.630973] [<ffffffff8108d7ab>] worker_thread+0x11b/0x3f0
Nov 3 03:21:49 DRIVE kernel: [ 859.630975] [<ffffffff8108d690>] ? create_worker+0x1e0/0x1e0
Nov 3 03:21:49 DRIVE kernel: [ 859.630976] [<ffffffff810932b9>] kthread+0xc9/0xe0
Nov 3 03:21:49 DRIVE kernel: [ 859.630977] [<ffffffff810931f0>] ? flush_kthread_worker+0x90/0x90
Nov 3 03:21:49 DRIVE kernel: [ 859.630978] [<ffffffff817a46fc>] ret_from_fork+0x7c/0xb0
Nov 3 03:21:49 DRIVE kernel: [ 859.630979] [<ffffffff810931f0>] ? flush_kthread_worker+0x90/0x90
Nov 3 03:21:49 DRIVE kernel: [ 859.630980] Code: 90 8b 0a 84 c9 66 90 75 f6 89 ce 89 c8 83 ce 01 f0 0f b1 32 39 c8 75 e7 b9 ff 00 00 00 eb 0a 0f 1f 84 00 00 00 00 00 f3 90 8b 02 <83> f8 01 75 f7 f0 0f b1 0a 83
f8 01 75 ee eb b3 0f 1f 40 00 8b
Это просто сама стабильность.