DMESG BTRFS Output

[38225.642922] INFO: task cnid_dbd:5358 blocked for more than 120 seconds.
[38225.642925]       Tainted: P          IO 3.13.9-gentoo #1
[38225.642927] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[38225.642928] cnid_dbd        D 0000000000000002     0  5358   3223 0x00000000
[38225.642933]  ffff880139f519f8 0000000000000082 ffff880139f51fd8 ffff880390d5f120
[38225.642936]  0000000000011900 ffff880390d5f120 ffff880418e9fe30 0000000000000003
[38225.642939]  0000000000000000 0000000000000000 0000000000000001 ffff880139f51960
[38225.642943] Call Trace:
[38225.642950]  [<ffffffff81082b31>] ? default_wake_function+0xd/0xf
[38225.642955]  [<ffffffff8108e02b>] ? autoremove_wake_function+0xd/0x2f
[38225.642958]  [<ffffffff8108daa8>] ? __wake_up_common+0x51/0x7e
[38225.642963]  [<ffffffff814c8472>] schedule+0x6a/0x6c
[38225.642967]  [<ffffffff81208370>] wait_for_commit.isra.18+0x4e/0x65
[38225.642970]  [<ffffffff8108e01e>] ? __wake_up_sync+0xd/0xd
[38225.642973]  [<ffffffff81208ec9>] btrfs_commit_transaction+0x133/0x7f9
[38225.642975]  [<ffffffff812098cd>] ? start_transaction+0x33e/0x45c
[38225.642980]  [<ffffffff811f6a40>] reserve_metadata_bytes+0x61f/0x6fd
[38225.642983]  [<ffffffff814ca1f1>] ? mutex_unlock+0x9/0xb
[38225.642986]  [<ffffffff811f6e8e>] btrfs_block_rsv_add+0x1b/0x3b
[38225.642988]  [<ffffffff812096e4>] start_transaction+0x155/0x45c
[38225.642991]  [<ffffffff81209a01>] btrfs_start_transaction+0x16/0x18
[38225.642995]  [<ffffffff8120dd16>] btrfs_dirty_inode+0x60/0xa4
[38225.642997]  [<ffffffff8120dde6>] btrfs_update_time+0x8c/0x9a
[38225.643002]  [<ffffffff8112a9d7>] update_time+0x1e/0xa2
[38225.643005]  [<ffffffff8112abff>] file_update_time+0x8f/0xad
[38225.643008]  [<ffffffff81214b68>] btrfs_page_mkwrite+0x68/0x2cc
[38225.643011]  [<ffffffff810eab30>] do_wp_page+0x1da/0x74b
[38225.643016]  [<ffffffff814691a1>] ? inet_recvmsg+0x6b/0x7a
[38225.643019]  [<ffffffff810ed93e>] handle_mm_fault+0x91c/0xb35
[38225.643023]  [<ffffffff81059d39>] __do_page_fault+0x2b9/0x41a
[38225.643027]  [<ffffffff814069a7>] ? SyS_recvfrom+0xe4/0x144
[38225.643032]  [<ffffffff8106e586>] ? __set_current_blocked+0x31/0x4c
[38225.643034]  [<ffffffff8106e6c1>] ? sigprocmask+0x5b/0x5f
[38225.643038]  [<ffffffff811265d8>] ? SyS_pselect6+0x18c/0x1a7
[38225.643043]  [<ffffffff81059ec2>] do_page_fault+0x9/0xb
[38225.643045]  [<ffffffff814cbb48>] page_fault+0x28/0x30
[38225.643049] INFO: task nmbd:16302 blocked for more than 120 seconds.
[38225.643049]       Tainted: P          IO 3.13.9-gentoo #1
[38225.643050] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[38225.643051] nmbd            D 0000000000000004     0 16302   3501 0x00000000
[38225.643052]  ffff880044b5bc68 0000000000000082 ffff880044b5bfd8 ffff880120540690
[38225.643054]  0000000000011900 ffff880120540690 0000000000000003 ffff88042ffcbb00
[38225.643055]  0000000000000002 0000000000000000 ffff880044b5bcd0 ffffffff810d56c3
[38225.643057] Call Trace:
[38225.643059]  [<ffffffff810d56c3>] ? __alloc_pages_nodemask+0x147/0x7fd
[38225.643061]  [<ffffffff814c8472>] schedule+0x6a/0x6c
[38225.643062]  [<ffffffff814c8731>] schedule_preempt_disabled+0x9/0xb
[38225.643064]  [<ffffffff814ca3d0>] __mutex_lock_slowpath+0x167/0x2a7
[38225.643065]  [<ffffffff814ca51d>] mutex_lock+0xd/0x1d
[38225.643066]  [<ffffffff81121827>] do_last+0x195/0xb54
[38225.643068]  [<ffffffff81122432>] path_openat+0x24c/0x5c1
[38225.643069]  [<ffffffff810ed93e>] ? handle_mm_fault+0x91c/0xb35
[38225.643070]  [<ffffffff81123490>] do_filp_open+0x35/0x7a
[38225.643072]  [<ffffffff8112cdc7>] ? __alloc_fd+0x59/0xe0
[38225.643075]  [<ffffffff811160c4>] do_sys_open+0x148/0x1d7
[38225.643076]  [<ffffffff8111616c>] SyS_open+0x19/0x1b
[38225.643078]  [<ffffffff814cc079>] system_call_fastpath+0x16/0x1b
[38225.643079] INFO: task nmbd:16309 blocked for more than 120 seconds.
[38225.643080]       Tainted: P          IO 3.13.9-gentoo #1
[38225.643080] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[38225.643081] nmbd            D 0000000000000004     0 16309   3501 0x00000000
[38225.643082]  ffff880398bcbc68 0000000000000086 ffff880398bcbfd8 ffff8800269163d0
[38225.643084]  0000000000011900 ffff8800269163d0 0000000000000003 ffff88042ffcbb00
[38225.643085]  0000000000000002 0000000000000000 ffff880398bcbcd0 ffffffff810d56c3
[38225.643087] Call Trace:
[38225.643089]  [<ffffffff810d56c3>] ? __alloc_pages_nodemask+0x147/0x7fd
[38225.643090]  [<ffffffff814c8472>] schedule+0x6a/0x6c
[38225.643092]  [<ffffffff814c8731>] schedule_preempt_disabled+0x9/0xb
[38225.643093]  [<ffffffff814ca3d0>] __mutex_lock_slowpath+0x167/0x2a7
[38225.643094]  [<ffffffff814ca51d>] mutex_lock+0xd/0x1d
[38225.643095]  [<ffffffff81121827>] do_last+0x195/0xb54
[38225.643097]  [<ffffffff81122432>] path_openat+0x24c/0x5c1
[38225.643098]  [<ffffffff810ed93e>] ? handle_mm_fault+0x91c/0xb35
[38225.643099]  [<ffffffff81123490>] do_filp_open+0x35/0x7a
[38225.643101]  [<ffffffff8112cdc7>] ? __alloc_fd+0x59/0xe0
[38225.643102]  [<ffffffff811160c4>] do_sys_open+0x148/0x1d7
[38225.643104]  [<ffffffff8111616c>] SyS_open+0x19/0x1b
[38225.643105]  [<ffffffff814cc079>] system_call_fastpath+0x16/0x1b
[38225.643107] INFO: task nmbd:16310 blocked for more than 120 seconds.
[38225.643107]       Tainted: P          IO 3.13.9-gentoo #1
[38225.643108] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[38225.643108] nmbd            D 0000000000000004     0 16310   3501 0x00000000
[38225.643110]  ffff8801bd79bc68 0000000000000082 ffff8801bd79bfd8 ffff8802e4f3cde0
[38225.643111]  0000000000011900 ffff8802e4f3cde0 00000002ffffffff 0000000000000000
[38225.643113]  0000000000000001 ffff88042ffcbb00 ffff88042ffcbb08 0000000000000000
[38225.643114] Call Trace:
[38225.643116]  [<ffffffff814c8472>] schedule+0x6a/0x6c
[38225.643118]  [<ffffffff814c8731>] schedule_preempt_disabled+0x9/0xb
[38225.643119]  [<ffffffff814ca3d0>] __mutex_lock_slowpath+0x167/0x2a7
[38225.643120]  [<ffffffff814ca51d>] mutex_lock+0xd/0x1d
[38225.643121]  [<ffffffff81121827>] do_last+0x195/0xb54
[38225.643123]  [<ffffffff81122432>] path_openat+0x24c/0x5c1
[38225.643124]  [<ffffffff810ed3fe>] ? handle_mm_fault+0x3dc/0xb35
[38225.643125]  [<ffffffff81123490>] do_filp_open+0x35/0x7a
[38225.643127]  [<ffffffff8112cdc7>] ? __alloc_fd+0x59/0xe0
[38225.643128]  [<ffffffff811160c4>] do_sys_open+0x148/0x1d7
[38225.643130]  [<ffffffff8111616c>] SyS_open+0x19/0x1b
[38225.643131]  [<ffffffff814cc079>] system_call_fastpath+0x16/0x1b
[38225.643133] INFO: task sendmail:16335 blocked for more than 120 seconds.
[38225.643134]       Tainted: P          IO 3.13.9-gentoo #1
[38225.643134] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[38225.643135] sendmail        D 0000000000000000     0 16335  16331 0x00000000
[38225.643136]  ffff8801c0395e28 0000000000000082 ffff8801c0395fd8 ffff8803c920b360
[38225.643138]  0000000000011900 ffff8803c920b360 00007fbd00459000 ffff8801ae747378
[38225.643139]  00007fbd00458000 ffff88022153def8 ffff8801c0395dd8 ffffffff810f138c
[38225.643141] Call Trace:
[38225.643143]  [<ffffffff810f138c>] ? vma_merge+0x1a6/0x2a1
[38225.643144]  [<ffffffff810f0842>] ? __vm_enough_memory+0x24/0x13c
[38225.643146]  [<ffffffff810f2827>] ? mmap_region+0x2f6/0x44a
[38225.643148]  [<ffffffff814c8472>] schedule+0x6a/0x6c
[38225.643149]  [<ffffffff814c8731>] schedule_preempt_disabled+0x9/0xb
[38225.643150]  [<ffffffff814ca3d0>] __mutex_lock_slowpath+0x167/0x2a7
[38225.643151]  [<ffffffff814ca51d>] mutex_lock+0xd/0x1d
[38225.643153]  [<ffffffff81215f36>] btrfs_file_llseek+0x3b/0x200
[38225.643155]  [<ffffffff8111a915>] ? SyS_newfstat+0x25/0x2e
[38225.643157]  [<ffffffff8111622c>] vfs_llseek+0x29/0x2b
[38225.643158]  [<ffffffff811165eb>] SyS_lseek+0x44/0x6b
[38225.643160]  [<ffffffff814cc079>] system_call_fastpath+0x16/0x1b