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["S. W." <cebit2006@xxxxxxxxxxxx>]

Public bug reported:


[  360.220144] INFO: task btrfs:2938 blocked for more than 120 seconds.
[  360.220152]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  360.220153] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  360.220155] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
[  360.220161]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
[  360.220163]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
[  360.220165]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
[  360.220167] Call Trace:
[  360.220179]  [<ffffffff817ec197>] schedule+0x37/0x80
[  360.220221]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
[  360.220225]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  360.220238]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
[  360.220243]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  360.220247]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  360.220249]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  360.220251]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  360.220254]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  360.220256]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  360.220259]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[  360.220264] INFO: task btrfs:3002 blocked for more than 120 seconds.
[  360.220266]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  360.220266] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  360.220267] btrfs           D ffff88087fd56640     0  3002   3001 0x00000000
[  360.220270]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
[  360.220272]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
[  360.220274]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
[  360.220276] Call Trace:
[  360.220278]  [<ffffffff817ec197>] schedule+0x37/0x80
[  360.220289]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
[  360.220291]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  360.220303]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
[  360.220306]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  360.220308]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  360.220310]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  360.220311]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  360.220313]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  360.220315]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  360.220317]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[  480.220139] INFO: task btrfs:2938 blocked for more than 120 seconds.
[  480.220148]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  480.220149] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  480.220152] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
[  480.220159]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
[  480.220162]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
[  480.220166]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
[  480.220169] Call Trace:
[  480.220180]  [<ffffffff817ec197>] schedule+0x37/0x80
[  480.220217]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
[  480.220222]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  480.220234]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
[  480.220238]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  480.220241]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  480.220243]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  480.220245]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  480.220248]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  480.220250]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  480.220253]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[  480.220257] INFO: task btrfs:3002 blocked for more than 120 seconds.
[  480.220258]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  480.220259] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  480.220260] btrfs           D ffff88087fd56640     0  3002   3001 0x00000000
[  480.220263]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
[  480.220265]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
[  480.220266]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
[  480.220268] Call Trace:
[  480.220270]  [<ffffffff817ec197>] schedule+0x37/0x80
[  480.220282]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
[  480.220283]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  480.220294]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
[  480.220297]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  480.220299]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  480.220301]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  480.220302]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  480.220304]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  480.220306]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  480.220308]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[  568.995645] audit: type=1400 audit(1450161017.458:22): apparmor="STATUS" operation="profile_load" profile="unconfined" name="libvirt-313c039d-5b69-4fa1-ac3c-c2599868e26b" pid=3495 comm="apparmor_parser"
[  568.995912] audit: type=1400 audit(1450161017.458:23): apparmor="STATUS" operation="profile_load" profile="unconfined" name="qemu_bridge_helper" pid=3495 comm="apparmor_parser"
[  569.072231] device vnet2 entered promiscuous mode
[  569.096185] br0: port 4(vnet2) entered listening state
[  569.096209] br0: port 4(vnet2) entered listening state
[  569.400115] audit: type=1400 audit(1450161017.866:24): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="libvirt-313c039d-5b69-4fa1-ac3c-c2599868e26b" pid=3520 comm="apparmor_parser"
[  569.412287] audit: type=1400 audit(1450161017.878:25): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="qemu_bridge_helper" pid=3520 comm="apparmor_parser"
[  572.783905] kvm: zapping shadow pages for mmio generation wraparound
[  584.124014] br0: port 4(vnet2) entered learning state
[  596.400977] kvm [3522]: vcpu0 unhandled rdmsr: 0x570
[  599.132011] br0: topology change detected, propagating
[  599.132024] br0: port 4(vnet2) entered forwarding state
[  600.220107] INFO: task btrfs:2938 blocked for more than 120 seconds.
[  600.220121]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  600.220126] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  600.220129] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
[  600.220139]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
[  600.220141]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
[  600.220143]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
[  600.220146] Call Trace:
[  600.220155]  [<ffffffff817ec197>] schedule+0x37/0x80
[  600.220196]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
[  600.220199]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  600.220211]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
[  600.220216]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  600.220219]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  600.220221]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  600.220223]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  600.220226]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  600.220228]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  600.220231]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[  600.220234] INFO: task btrfs:3002 blocked for more than 120 seconds.
[  600.220236]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  600.220237] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  600.220237] btrfs           D ffff88087fd56640     0  3002   3001 0x00000004
[  600.220240]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
[  600.220242]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
[  600.220244]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
[  600.220246] Call Trace:
[  600.220248]  [<ffffffff817ec197>] schedule+0x37/0x80
[  600.220259]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
[  600.220261]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  600.220272]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
[  600.220274]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  600.220276]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  600.220278]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  600.220280]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  600.220282]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  600.220283]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  600.220286]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[  720.220100] INFO: task btrfs:2938 blocked for more than 120 seconds.
[  720.220108]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  720.220110] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  720.220113] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
[  720.220119]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
[  720.220123]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
[  720.220126]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
[  720.220129] Call Trace:
[  720.220140]  [<ffffffff817ec197>] schedule+0x37/0x80
[  720.220182]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
[  720.220186]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  720.220198]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
[  720.220203]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  720.220206]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  720.220208]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  720.220210]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  720.220213]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  720.220215]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  720.220218]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[  720.220221] INFO: task btrfs:3002 blocked for more than 120 seconds.
[  720.220223]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  720.220223] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  720.220224] btrfs           D ffff88087fd56640     0  3002   3001 0x00000004
[  720.220227]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
[  720.220229]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
[  720.220231]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
[  720.220233] Call Trace:
[  720.220234]  [<ffffffff817ec197>] schedule+0x37/0x80
[  720.220246]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
[  720.220247]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  720.220259]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
[  720.220261]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  720.220263]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  720.220265]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  720.220266]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  720.220268]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  720.220270]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  720.220272]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[  840.220097] INFO: task btrfs:2938 blocked for more than 120 seconds.
[  840.220104]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  840.220105] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  840.220107] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
[  840.220112]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
[  840.220114]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
[  840.220116]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
[  840.220118] Call Trace:
[  840.220128]  [<ffffffff817ec197>] schedule+0x37/0x80
[  840.220159]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
[  840.220163]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  840.220175]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
[  840.220180]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  840.220183]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  840.220185]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  840.220187]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  840.220190]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  840.220192]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  840.220195]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[  840.220198] INFO: task btrfs:3002 blocked for more than 120 seconds.
[  840.220200]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
[  840.220201] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  840.220202] btrfs           D ffff88087fd56640     0  3002   3001 0x00000004
[  840.220204]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
[  840.220206]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
[  840.220208]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
[  840.220210] Call Trace:
[  840.220212]  [<ffffffff817ec197>] schedule+0x37/0x80
[  840.220223]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
[  840.220225]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
[  840.220236]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
[  840.220239]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
[  840.220241]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
[  840.220242]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
[  840.220244]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
[  840.220246]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[  840.220248]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[  840.220250]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 15.10 4.2.0 btrfs

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https://bugs.launchpad.net/bugs/1526692

Title:
  Ubuntu 15.10 - btrfs - Kernel Panic on btrfs balance

Status in linux package in Ubuntu:
  New

Bug description:

  
  [  360.220144] INFO: task btrfs:2938 blocked for more than 120 seconds.
  [  360.220152]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  360.220153] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  360.220155] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
  [  360.220161]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
  [  360.220163]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  360.220165]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
  [  360.220167] Call Trace:
  [  360.220179]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  360.220221]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
  [  360.220225]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  360.220238]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
  [  360.220243]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  360.220247]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  360.220249]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  360.220251]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  360.220254]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  360.220256]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  360.220259]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  360.220264] INFO: task btrfs:3002 blocked for more than 120 seconds.
  [  360.220266]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  360.220266] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  360.220267] btrfs           D ffff88087fd56640     0  3002   3001 0x00000000
  [  360.220270]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
  [  360.220272]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  360.220274]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
  [  360.220276] Call Trace:
  [  360.220278]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  360.220289]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
  [  360.220291]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  360.220303]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
  [  360.220306]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  360.220308]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  360.220310]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  360.220311]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  360.220313]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  360.220315]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  360.220317]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  480.220139] INFO: task btrfs:2938 blocked for more than 120 seconds.
  [  480.220148]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  480.220149] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  480.220152] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
  [  480.220159]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
  [  480.220162]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  480.220166]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
  [  480.220169] Call Trace:
  [  480.220180]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  480.220217]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
  [  480.220222]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  480.220234]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
  [  480.220238]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  480.220241]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  480.220243]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  480.220245]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  480.220248]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  480.220250]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  480.220253]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  480.220257] INFO: task btrfs:3002 blocked for more than 120 seconds.
  [  480.220258]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  480.220259] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  480.220260] btrfs           D ffff88087fd56640     0  3002   3001 0x00000000
  [  480.220263]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
  [  480.220265]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  480.220266]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
  [  480.220268] Call Trace:
  [  480.220270]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  480.220282]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
  [  480.220283]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  480.220294]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
  [  480.220297]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  480.220299]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  480.220301]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  480.220302]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  480.220304]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  480.220306]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  480.220308]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  568.995645] audit: type=1400 audit(1450161017.458:22): apparmor="STATUS" operation="profile_load" profile="unconfined" name="libvirt-313c039d-5b69-4fa1-ac3c-c2599868e26b" pid=3495 comm="apparmor_parser"
  [  568.995912] audit: type=1400 audit(1450161017.458:23): apparmor="STATUS" operation="profile_load" profile="unconfined" name="qemu_bridge_helper" pid=3495 comm="apparmor_parser"
  [  569.072231] device vnet2 entered promiscuous mode
  [  569.096185] br0: port 4(vnet2) entered listening state
  [  569.096209] br0: port 4(vnet2) entered listening state
  [  569.400115] audit: type=1400 audit(1450161017.866:24): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="libvirt-313c039d-5b69-4fa1-ac3c-c2599868e26b" pid=3520 comm="apparmor_parser"
  [  569.412287] audit: type=1400 audit(1450161017.878:25): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="qemu_bridge_helper" pid=3520 comm="apparmor_parser"
  [  572.783905] kvm: zapping shadow pages for mmio generation wraparound
  [  584.124014] br0: port 4(vnet2) entered learning state
  [  596.400977] kvm [3522]: vcpu0 unhandled rdmsr: 0x570
  [  599.132011] br0: topology change detected, propagating
  [  599.132024] br0: port 4(vnet2) entered forwarding state
  [  600.220107] INFO: task btrfs:2938 blocked for more than 120 seconds.
  [  600.220121]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  600.220126] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  600.220129] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
  [  600.220139]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
  [  600.220141]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  600.220143]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
  [  600.220146] Call Trace:
  [  600.220155]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  600.220196]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
  [  600.220199]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  600.220211]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
  [  600.220216]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  600.220219]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  600.220221]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  600.220223]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  600.220226]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  600.220228]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  600.220231]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  600.220234] INFO: task btrfs:3002 blocked for more than 120 seconds.
  [  600.220236]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  600.220237] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  600.220237] btrfs           D ffff88087fd56640     0  3002   3001 0x00000004
  [  600.220240]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
  [  600.220242]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  600.220244]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
  [  600.220246] Call Trace:
  [  600.220248]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  600.220259]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
  [  600.220261]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  600.220272]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
  [  600.220274]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  600.220276]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  600.220278]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  600.220280]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  600.220282]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  600.220283]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  600.220286]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  720.220100] INFO: task btrfs:2938 blocked for more than 120 seconds.
  [  720.220108]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  720.220110] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  720.220113] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
  [  720.220119]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
  [  720.220123]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  720.220126]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
  [  720.220129] Call Trace:
  [  720.220140]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  720.220182]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
  [  720.220186]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  720.220198]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
  [  720.220203]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  720.220206]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  720.220208]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  720.220210]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  720.220213]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  720.220215]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  720.220218]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  720.220221] INFO: task btrfs:3002 blocked for more than 120 seconds.
  [  720.220223]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  720.220223] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  720.220224] btrfs           D ffff88087fd56640     0  3002   3001 0x00000004
  [  720.220227]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
  [  720.220229]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  720.220231]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
  [  720.220233] Call Trace:
  [  720.220234]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  720.220246]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
  [  720.220247]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  720.220259]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
  [  720.220261]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  720.220263]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  720.220265]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  720.220266]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  720.220268]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  720.220270]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  720.220272]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  840.220097] INFO: task btrfs:2938 blocked for more than 120 seconds.
  [  840.220104]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  840.220105] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  840.220107] btrfs           D ffff88087fc16640     0  2938   2937 0x00000000
  [  840.220112]  ffff880833b87c78 0000000000000086 ffffffff81c13500 ffff880835525940
  [  840.220114]  0000000000000246 ffff880833b88000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  840.220116]  ffff880855758980 ffff8807f2c97300 ffff880833b87c98 ffffffff817ec197
  [  840.220118] Call Trace:
  [  840.220128]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  840.220159]  [<ffffffffc03fc197>] btrfs_cancel_balance+0x127/0x180 [btrfs]
  [  840.220163]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  840.220175]  [<ffffffffc040bd25>] btrfs_ioctl+0xd55/0x2760 [btrfs]
  [  840.220180]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  840.220183]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  840.220185]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  840.220187]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  840.220190]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  840.220192]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  840.220195]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  840.220198] INFO: task btrfs:3002 blocked for more than 120 seconds.
  [  840.220200]       Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [  840.220201] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  840.220202] btrfs           D ffff88087fd56640     0  3002   3001 0x00000004
  [  840.220204]  ffff8807e340bc78 0000000000000086 ffff88085bf1cc80 ffff880857fa9980
  [  840.220206]  0000000000000246 ffff8807e340c000 ffff88085b9c0c70 ffff88085b9c0cb0
  [  840.220208]  ffff880855758980 ffff88085a181700 ffff8807e340bc98 ffffffff817ec197
  [  840.220210] Call Trace:
  [  840.220212]  [<ffffffff817ec197>] schedule+0x37/0x80
  [  840.220223]  [<ffffffffc03fbfe2>] btrfs_pause_balance+0x92/0x120 [btrfs]
  [  840.220225]  [<ffffffff810bd110>] ? wake_atomic_t_function+0x60/0x60
  [  840.220236]  [<ffffffffc040ca0e>] btrfs_ioctl+0x1a3e/0x2760 [btrfs]
  [  840.220239]  [<ffffffff81192b7b>] ? lru_cache_add_active_or_unevictable+0x2b/0xa0
  [  840.220241]  [<ffffffff811b5127>] ? handle_mm_fault+0xc77/0x17e0
  [  840.220242]  [<ffffffff811b8acd>] ? __vma_link_rb+0xfd/0x110
  [  840.220244]  [<ffffffff811b8b99>] ? vma_link+0xb9/0xc0
  [  840.220246]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [  840.220248]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [  840.220250]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75

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