** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1718925

Title:
  btrfs/130 test causing soft lockup and  rcu_sched self-detected stall
  on CPU

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This issue was found by the regression test suite.
  This test will hang and get killed with our timeout setting.

  It's not a regression as I can see that it will time out on older
  kernels as well. And it can be seen on different releases (although I
  haven't check if they all have the same dmesg output)

  The stalled process will hinder the test for xfs filesystem. As the
  partition was occupied and cannot be destroyed.

  There is a similar bug 1717443

  [  215.728801] BTRFS: device fsid 97eb2b12-1ed4-4cab-bdb8-de78292ab2d1 devid 
1 transid 3 /dev/sdb2
  [  215.808560] BTRFS info (device sdb2): disk space caching is enabled
  [  215.808564] BTRFS: has skinny extents
  [  215.808566] BTRFS: flagging fs with big metadata feature
  [  215.922083] BTRFS: creating UUID tree
  [  216.295453] BTRFS: device fsid 18dbdc70-b4a8-4a1d-bd6e-629a7c44c769 devid 
1 transid 3 /dev/sdb2
  [  216.374891] BTRFS info (device sdb2): disk space caching is enabled
  [  216.374894] BTRFS: has skinny extents
  [  216.374896] BTRFS: flagging fs with big metadata feature
  [  216.397006] BTRFS: creating UUID tree
  [  222.588433] perf interrupt took too long (3642 > 2500), lowering 
kernel.perf_event_max_sample_rate to 50000
  [  256.078072] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[btrfs:12947]
  [  256.078507] Modules linked in: ipmi_ssif intel_rapl x86_pkg_temp_thermal 
intel_powerclamp coretemp kvm_intel kvm irqbypass sb_edac edac_core hpilo 
8250_fintek ipmi_si ipmi_msghandler lpc_ich shpchp acpi_power_meter ioatdma dca 
mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp 
libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 
async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq 
libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel ses enclosure aesni_intel aes_x86_64 lrw gf128mul 
glue_helper ablk_helper cryptd tg3 ptp pps_core hpsa scsi_transport_sas wmi fjes
  [  256.078570] CPU: 0 PID: 12947 Comm: btrfs Not tainted 4.4.0-96-generic 
#119-Ubuntu
  [  256.078573] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, 
BIOS P89 12/27/2015
  [  256.078576] task: ffff880858118e00 ti: ffff880859eec000 task.ti: 
ffff880859eec000
  [  256.078579] RIP: 0010:[<ffffffffc0289504>]  [<ffffffffc0289504>] 
find_parent_nodes+0x5c4/0x7a0 [btrfs]
  [  256.078618] RSP: 0018:ffff880859eef928  EFLAGS: 00000282
  [  256.078620] RAX: ffff88083fb29c40 RBX: 0000000000000000 RCX: 
ffff880859eef970
  [  256.078623] RDX: ffff88083fb29c20 RSI: 0000000001c78000 RDI: 
ffff880854561000
  [  256.078625] RBP: ffff880859eef9f8 R08: 0000000002400040 R09: 
0000000180330021
  [  256.078627] R10: ffff88083fc6f5a0 R11: 000000000001a890 R12: 
ffff880854561000
  [  256.078628] R13: ffff88083fc6f500 R14: 0000000000000000 R15: 
ffff880859eefa50
  [  256.078632] FS:  00007f52288698c0(0000) GS:ffff88085f200000(0000) 
knlGS:0000000000000000
  [  256.078634] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  256.078636] CR2: 00007f52277ebe38 CR3: 00000008547cd000 CR4: 
00000000003406f0
  [  256.078638] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [  256.078640] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [  256.078642] Stack:
  [  256.078644]  0000000000000000 ffff88085b318000 0000000000000000 
ffff880854561000
  [  256.078648]  ffff880859eefa50 0000000000c40000 0000000000000000 
ffff8808592091b0
  [  256.078652]  00000000592093f0 ffff8808580e5ce0 0000000000001063 
ffff880859eef980
  [  256.078656] Call Trace:
  [  256.078683]  [<ffffffffc02911d0>] ? dir_changed.isra.15+0xa0/0xa0 [btrfs]
  [  256.078706]  [<ffffffffc028a3c9>] iterate_extent_inodes+0x109/0x350 [btrfs]
  [  256.078726]  [<ffffffffc028a018>] ? extent_from_logical+0x198/0x230 [btrfs]
  [  256.078747]  [<ffffffffc0295aa1>] process_extent+0x771/0x1000 [btrfs]
  [  256.078767]  [<ffffffffc0292960>] ? __record_deleted_ref+0x30/0x30 [btrfs]
  [  256.078786]  [<ffffffffc0297021>] changed_cb+0x231/0xad0 [btrfs]
  [  256.078805]  [<ffffffffc02989f4>] btrfs_ioctl_send+0x1134/0x1210 [btrfs]
  [  256.078828]  [<ffffffffc025f083>] btrfs_ioctl+0x2a3/0x28b0 [btrfs]
  [  256.078833]  [<ffffffff810b4e67>] ? task_move_group_fair+0x57/0x60
  [  256.078839]  [<ffffffff810b2d6c>] ? __enqueue_entity+0x6c/0x70
  [  256.078842]  [<ffffffff810b8937>] ? enqueue_entity+0x3a7/0xd10
  [  256.078846]  [<ffffffff810b934a>] ? enqueue_task_fair+0xaa/0x8b0
  [  256.078850]  [<ffffffff81037ef9>] ? sched_clock+0x9/0x10
  [  256.078854]  [<ffffffff810b1d9f>] ? sched_clock_cpu+0x8f/0xa0
  [  256.078859]  [<ffffffff81223faf>] do_vfs_ioctl+0x29f/0x490
  [  256.078863]  [<ffffffff8108061c>] ? _do_fork+0xec/0x360
  [  256.078867]  [<ffffffff81224219>] SyS_ioctl+0x79/0x90
  [  256.078872]  [<ffffffff81843272>] entry_SYSCALL_64_fastpath+0x16/0x71
  [  256.078875] Code: a8 01 00 00 75 32 48 8b 85 78 ff ff ff 48 85 c0 0f 84 a2 
01 00 00 48 8b 50 10 48 85 d2 75 08 e9 96 01 00 00 48 89 c2 48 8b 42 10 <48> 85 
c0 75 f4 49 8b 45 38 48 89 42 10 48 c7 85 78 ff ff ff 00 
  [  284.077090] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[btrfs:12947]
  [  284.077530] Modules linked in: ipmi_ssif intel_rapl x86_pkg_temp_thermal 
intel_powerclamp coretemp kvm_intel kvm irqbypass sb_edac edac_core hpilo 
8250_fintek ipmi_si ipmi_msghandler lpc_ich shpchp acpi_power_meter ioatdma dca 
mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp 
libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 
async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq 
libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel ses enclosure aesni_intel aes_x86_64 lrw gf128mul 
glue_helper ablk_helper cryptd tg3 ptp pps_core hpsa scsi_transport_sas wmi fjes
  [  284.077589] CPU: 0 PID: 12947 Comm: btrfs Tainted: G             L  
4.4.0-96-generic #119-Ubuntu
  [  284.077591] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, 
BIOS P89 12/27/2015
  [  284.077594] task: ffff880858118e00 ti: ffff880859eec000 task.ti: 
ffff880859eec000
  [  284.077596] RIP: 0010:[<ffffffffc02894fd>]  [<ffffffffc02894fd>] 
find_parent_nodes+0x5bd/0x7a0 [btrfs]
  [  284.077634] RSP: 0018:ffff880859eef928  EFLAGS: 00000286
  [  284.077636] RAX: ffff88083b22d200 RBX: 0000000000000000 RCX: 
ffff880859eef970
  [  284.077638] RDX: ffff88083b22d1e0 RSI: 0000000001ca8000 RDI: 
ffff880854561000
  [  284.077640] RBP: ffff880859eef9f8 R08: 0000000002400040 R09: 
0000000180330020
  [  284.077641] R10: ffff88083fd1b780 R11: 000000000001a890 R12: 
ffff880854561000
  [  284.077643] R13: ffff88083fd1b6e0 R14: 0000000000000000 R15: 
ffff880859eefa50
  [  284.077646] FS:  00007f52288698c0(0000) GS:ffff88085f200000(0000) 
knlGS:0000000000000000
  [  284.077648] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  284.077650] CR2: 00007f52277ebe38 CR3: 00000008547cd000 CR4: 
00000000003406f0
  [  284.077652] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [  284.077654] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [  284.077655] Stack:
  [  284.077657]  0000000000000000 ffff88085b318000 0000000000000000 
ffff880854561000
  [  284.077661]  ffff880859eefa50 0000000000c40000 0000000000000000 
ffff8808592091b0
  [  284.077664]  00000000592093f0 ffff880850c898e0 0000000000001063 
ffff880859eef980
  [  284.077668] Call Trace:
  [  284.077693]  [<ffffffffc02911d0>] ? dir_changed.isra.15+0xa0/0xa0 [btrfs]
  [  284.077715]  [<ffffffffc028a3c9>] iterate_extent_inodes+0x109/0x350 [btrfs]
  [  284.077734]  [<ffffffffc028a018>] ? extent_from_logical+0x198/0x230 [btrfs]
  [  284.077753]  [<ffffffffc0295aa1>] process_extent+0x771/0x1000 [btrfs]
  [  284.077772]  [<ffffffffc0292960>] ? __record_deleted_ref+0x30/0x30 [btrfs]
  [  284.077789]  [<ffffffffc0297021>] changed_cb+0x231/0xad0 [btrfs]
  [  284.077807]  [<ffffffffc02989f4>] btrfs_ioctl_send+0x1134/0x1210 [btrfs]
  [  284.077828]  [<ffffffffc025f083>] btrfs_ioctl+0x2a3/0x28b0 [btrfs]
  [  284.077833]  [<ffffffff810b4e67>] ? task_move_group_fair+0x57/0x60
  [  284.077839]  [<ffffffff810b2d6c>] ? __enqueue_entity+0x6c/0x70
  [  284.077842]  [<ffffffff810b8937>] ? enqueue_entity+0x3a7/0xd10
  [  284.077845]  [<ffffffff810b934a>] ? enqueue_task_fair+0xaa/0x8b0
  [  284.077849]  [<ffffffff81037ef9>] ? sched_clock+0x9/0x10
  [  284.077853]  [<ffffffff810b1d9f>] ? sched_clock_cpu+0x8f/0xa0
  [  284.077857]  [<ffffffff81223faf>] do_vfs_ioctl+0x29f/0x490
  [  284.077861]  [<ffffffff8108061c>] ? _do_fork+0xec/0x360
  [  284.077864]  [<ffffffff81224219>] SyS_ioctl+0x79/0x90
  [  284.077870]  [<ffffffff81843272>] entry_SYSCALL_64_fastpath+0x16/0x71
  [  284.077872] Code: 00 85 c0 89 c3 0f 88 a8 01 00 00 75 32 48 8b 85 78 ff ff 
ff 48 85 c0 0f 84 a2 01 00 00 48 8b 50 10 48 85 d2 75 08 e9 96 01 00 00 <48> 89 
c2 48 8b 42 10 48 85 c0 75 f4 49 8b 45 38 48 89 42 10 48 
  [  291.864815] INFO: rcu_sched self-detected stall on CPU
  [  291.865136]        0-...: (14999 ticks this GP) idle=037/140000000000001/0 
softirq=6826/6826 fqs=14986 
  [  291.865666]         (t=15000 jiffies g=5255 c=5254 q=462)
  [  291.865966] Task dump for CPU 0:
  [  291.865969] btrfs           R  running task        0 12947   8601 
0x00000008
  [  291.865974]  ffff880858118e00 7d3693218f1b3cab ffff88085f203da8 
ffffffff810aedd9
  [  291.865978]  0000000000000000 ffffffff81e52e00 ffff88085f203dc0 
ffffffff810b16b7
  [  291.865981]  0000000000000001 ffff88085f203df0 ffffffff810e527e 
ffff88085f217b80
  [  291.865984] Call Trace:
  [  291.865987]  <IRQ>  [<ffffffff810aedd9>] sched_show_task+0xa9/0x110
  [  291.866000]  [<ffffffff810b16b7>] dump_cpu_task+0x37/0x40
  [  291.866005]  [<ffffffff810e527e>] rcu_dump_cpu_stacks+0x8e/0xe0
  [  291.866009]  [<ffffffff810e901a>] rcu_check_callbacks+0x4fa/0x7f0
  [  291.866016]  [<ffffffff81140d1c>] ? acct_account_cputime+0x1c/0x20
  [  291.866020]  [<ffffffff810b215f>] ? account_system_time+0x7f/0x110
  [  291.866025]  [<ffffffff810ff300>] ? tick_sched_handle.isra.14+0x60/0x60
  [  291.866029]  [<ffffffff810ef5c9>] update_process_times+0x39/0x60
  [  291.866032]  [<ffffffff810ff2c5>] tick_sched_handle.isra.14+0x25/0x60
  [  291.866036]  [<ffffffff810ff33d>] tick_sched_timer+0x3d/0x70
  [  291.866039]  [<ffffffff810eff02>] __hrtimer_run_queues+0x102/0x290
  [  291.866042]  [<ffffffff810f06c8>] hrtimer_interrupt+0xa8/0x1a0
  [  291.866048]  [<ffffffff81053078>] local_apic_timer_interrupt+0x38/0x60
  [  291.866053]  [<ffffffff81845d1d>] smp_apic_timer_interrupt+0x3d/0x50
  [  291.866059]  [<ffffffff81843fe2>] apic_timer_interrupt+0x82/0x90
  [  291.866061]  <EOI>  [<ffffffffc0289504>] ? find_parent_nodes+0x5c4/0x7a0 
[btrfs]
  [  291.866113]  [<ffffffffc02894d3>] ? find_parent_nodes+0x593/0x7a0 [btrfs]
  [  291.866134]  [<ffffffffc02911d0>] ? dir_changed.isra.15+0xa0/0xa0 [btrfs]
  [  291.866154]  [<ffffffffc028a3c9>] iterate_extent_inodes+0x109/0x350 [btrfs]
  [  291.866171]  [<ffffffffc028a018>] ? extent_from_logical+0x198/0x230 [btrfs]
  [  291.866190]  [<ffffffffc0295aa1>] process_extent+0x771/0x1000 [btrfs]
  [  291.866208]  [<ffffffffc0292960>] ? __record_deleted_ref+0x30/0x30 [btrfs]
  [  291.866225]  [<ffffffffc0297021>] changed_cb+0x231/0xad0 [btrfs]
  [  291.866243]  [<ffffffffc02989f4>] btrfs_ioctl_send+0x1134/0x1210 [btrfs]
  [  291.866264]  [<ffffffffc025f083>] btrfs_ioctl+0x2a3/0x28b0 [btrfs]
  [  291.866268]  [<ffffffff810b4e67>] ? task_move_group_fair+0x57/0x60
  [  291.866273]  [<ffffffff810b2d6c>] ? __enqueue_entity+0x6c/0x70
  [  291.866276]  [<ffffffff810b8937>] ? enqueue_entity+0x3a7/0xd10
  [  291.866279]  [<ffffffff810b934a>] ? enqueue_task_fair+0xaa/0x8b0
  [  291.866283]  [<ffffffff81037ef9>] ? sched_clock+0x9/0x10
  [  291.866286]  [<ffffffff810b1d9f>] ? sched_clock_cpu+0x8f/0xa0
  [  291.866291]  [<ffffffff81223faf>] do_vfs_ioctl+0x29f/0x490
  [  291.866295]  [<ffffffff8108061c>] ? _do_fork+0xec/0x360
  [  291.866298]  [<ffffffff81224219>] SyS_ioctl+0x79/0x90
  [  291.866302]  [<ffffffff81843272>] entry_SYSCALL_64_fastpath+0x16/0x71
  [  316.075965] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[btrfs:12947]
  [  316.076407] Modules linked in: ipmi_ssif intel_rapl x86_pkg_temp_thermal 
intel_powerclamp coretemp kvm_intel kvm irqbypass sb_edac edac_core hpilo 
8250_fintek ipmi_si ipmi_msghandler lpc_ich shpchp acpi_power_meter ioatdma dca 
mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp 
libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 
async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq 
libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel ses enclosure aesni_intel aes_x86_64 lrw gf128mul 
glue_helper ablk_helper cryptd tg3 ptp pps_core hpsa scsi_transport_sas wmi fjes
  [  316.076465] CPU: 0 PID: 12947 Comm: btrfs Tainted: G             L  
4.4.0-96-generic #119-Ubuntu
  [  316.076468] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, 
BIOS P89 12/27/2015
  [  316.076471] task: ffff880858118e00 ti: ffff880859eec000 task.ti: 
ffff880859eec000
  [  316.076473] RIP: 0010:[<ffffffffc02894fd>]  [<ffffffffc02894fd>] 
find_parent_nodes+0x5bd/0x7a0 [btrfs]
  [  316.076510] RSP: 0018:ffff880859eef928  EFLAGS: 00000286
  [  316.076512] RAX: ffff880022d2a0a0 RBX: 0000000000000000 RCX: 
ffff880859eef970
  [  316.076514] RDX: ffff880022d2a080 RSI: 0000000001c78000 RDI: 
ffff880854561000
  [  316.076515] RBP: ffff880859eef9f8 R08: 0000000002400040 R09: 
0000000180330014
  [  316.076517] R10: ffff88083fd9f9b0 R11: 000000000001a890 R12: 
ffff880854561000
  [  316.076519] R13: ffff88083fd9f910 R14: 0000000000000000 R15: 
ffff880859eefa50
  [  316.076522] FS:  00007f52288698c0(0000) GS:ffff88085f200000(0000) 
knlGS:0000000000000000
  [  316.076524] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  316.076526] CR2: 00007f52277ebe38 CR3: 00000008547cd000 CR4: 
00000000003406f0
  [  316.076528] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [  316.076530] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [  316.076531] Stack:
  [  316.076533]  0000000000000000 ffff88085b318000 0000000000000000 
ffff880854561000
  [  316.076537]  ffff880859eefa50 0000000000c40000 0000000000000000 
ffff8808592091b0
  [  316.076540]  00000000592093f0 ffff8808580e5ce0 0000000000001063 
ffff880859eef980
  [  316.076544] Call Trace:
  [  316.076568]  [<ffffffffc02911d0>] ? dir_changed.isra.15+0xa0/0xa0 [btrfs]
  [  316.076589]  [<ffffffffc028a3c9>] iterate_extent_inodes+0x109/0x350 [btrfs]
  [  316.076609]  [<ffffffffc028a018>] ? extent_from_logical+0x198/0x230 [btrfs]
  [  316.076628]  [<ffffffffc0295aa1>] process_extent+0x771/0x1000 [btrfs]
  [  316.076646]  [<ffffffffc0292960>] ? __record_deleted_ref+0x30/0x30 [btrfs]
  [  316.076663]  [<ffffffffc0297021>] changed_cb+0x231/0xad0 [btrfs]
  [  316.076681]  [<ffffffffc02989f4>] btrfs_ioctl_send+0x1134/0x1210 [btrfs]
  [  316.076702]  [<ffffffffc025f083>] btrfs_ioctl+0x2a3/0x28b0 [btrfs]
  [  316.076707]  [<ffffffff810b4e67>] ? task_move_group_fair+0x57/0x60
  [  316.076713]  [<ffffffff810b2d6c>] ? __enqueue_entity+0x6c/0x70
  [  316.076716]  [<ffffffff810b8937>] ? enqueue_entity+0x3a7/0xd10
  [  316.076719]  [<ffffffff810b934a>] ? enqueue_task_fair+0xaa/0x8b0
  [  316.076723]  [<ffffffff81037ef9>] ? sched_clock+0x9/0x10
  [  316.076727]  [<ffffffff810b1d9f>] ? sched_clock_cpu+0x8f/0xa0
  [  316.076731]  [<ffffffff81223faf>] do_vfs_ioctl+0x29f/0x490
  [  316.076735]  [<ffffffff8108061c>] ? _do_fork+0xec/0x360
  [  316.076738]  [<ffffffff81224219>] SyS_ioctl+0x79/0x90
  [  316.076744]  [<ffffffff81843272>] entry_SYSCALL_64_fastpath+0x16/0x71
  [  316.076746] Code: 00 85 c0 89 c3 0f 88 a8 01 00 00 75 32 48 8b 85 78 ff ff 
ff 48 85 c0 0f 84 a2 01 00 00 48 8b 50 10 48 85 d2 75 08 e9 96 01 00 00 <48> 89 
c2 48 8b 42 10 48 85 c0 75 f4 49 8b 45 38 48 89 42 10 48 
  [  319.350180] perf interrupt took too long (5787 > 5000), lowering 
kernel.perf_event_max_sample_rate to 25000
  [  332.110571] cfg80211: World regulatory domain updated:
  [  332.110576] cfg80211:  DFS Master region: unset
  [  332.110578] cfg80211:   (start_freq - end_freq @ bandwidth), 
(max_antenna_gain, max_eirp), (dfs_cac_time)
  [  332.110581] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 
2000 mBm), (N/A)
  [  332.110584] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 
2000 mBm), (N/A)
  [  332.110586] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 
2000 mBm), (N/A)
  [  332.110589] cfg80211:   (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000 KHz 
AUTO), (N/A, 2000 mBm), (N/A)
  [  332.110592] cfg80211:   (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000 KHz 
AUTO), (N/A, 2000 mBm), (0 s)
  [  332.110594] cfg80211:   (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 
2000 mBm), (0 s)
  [  332.110596] cfg80211:   (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 
2000 mBm), (N/A)
  [  332.110599] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 
0 mBm), (N/A)
  [  364.122273] NMI watchdog: BUG: soft lockup - CPU#12 stuck for 23s! 
[btrfs:12947]
  [  364.122716] Modules linked in: cfg80211 ipmi_ssif intel_rapl 
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass sb_edac 
edac_core hpilo 8250_fintek ipmi_si ipmi_msghandler lpc_ich shpchp 
acpi_power_meter ioatdma dca mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad 
ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 
btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx 
xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul 
crc32_pclmul ghash_clmulni_intel ses enclosure aesni_intel aes_x86_64 lrw 
gf128mul glue_helper ablk_helper cryptd tg3 ptp pps_core hpsa 
scsi_transport_sas wmi fjes
  [  364.122777] CPU: 12 PID: 12947 Comm: btrfs Tainted: G             L  
4.4.0-96-generic #119-Ubuntu
  [  364.122779] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, 
BIOS P89 12/27/2015
  [  364.122782] task: ffff880858118e00 ti: ffff880859eec000 task.ti: 
ffff880859eec000
  [  364.122785] RIP: 0010:[<ffffffffc02894fd>]  [<ffffffffc02894fd>] 
find_parent_nodes+0x5bd/0x7a0 [btrfs]
  [  364.122822] RSP: 0018:ffff880859eef928  EFLAGS: 00000282
  [  364.122824] RAX: ffff8800224c3c80 RBX: 0000000000000000 RCX: 
ffff880859eef970
  [  364.122826] RDX: ffff8800224c3c60 RSI: 0000000001c9c000 RDI: 
ffff8808500aff00
  [  364.122828] RBP: ffff880859eef9f8 R08: 0000000002400040 R09: 
0000000180330012
  [  364.122830] R10: ffff88083414eaa0 R11: 000000000001a890 R12: 
ffff8808500aff00
  [  364.122831] R13: ffff88083414ea00 R14: 0000000000000000 R15: 
ffff880859eefa50
  [  364.122834] FS:  00007f52288698c0(0000) GS:ffff88085f500000(0000) 
knlGS:0000000000000000
  [  364.122836] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  364.122838] CR2: 00007fdd1abdc0e0 CR3: 00000008547cd000 CR4: 
00000000003406e0
  [  364.122840] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [  364.122842] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [  364.122844] Stack:
  [  364.122845]  0000000000000000 ffff88085b318000 0000000000000000 
ffff8808500aff00
  [  364.122849]  ffff880859eefa50 0000000000c40000 0000000000000000 
ffff88085928ed80
  [  364.122853]  000000005928ecf0 ffff880857ad5600 0000000000001063 
ffff880859eef980
  [  364.122856] Call Trace:
  [  364.122881]  [<ffffffffc02911d0>] ? dir_changed.isra.15+0xa0/0xa0 [btrfs]
  [  364.122902]  [<ffffffffc028a3c9>] iterate_extent_inodes+0x109/0x350 [btrfs]
  [  364.122920]  [<ffffffffc028a018>] ? extent_from_logical+0x198/0x230 [btrfs]
  [  364.122939]  [<ffffffffc0295aa1>] process_extent+0x771/0x1000 [btrfs]
  [  364.122957]  [<ffffffffc0292960>] ? __record_deleted_ref+0x30/0x30 [btrfs]
  [  364.122975]  [<ffffffffc0297021>] changed_cb+0x231/0xad0 [btrfs]
  [  364.122992]  [<ffffffffc02989f4>] btrfs_ioctl_send+0x1134/0x1210 [btrfs]
  [  364.123013]  [<ffffffffc025f083>] btrfs_ioctl+0x2a3/0x28b0 [btrfs]
  [  364.123019]  [<ffffffff810b4e67>] ? task_move_group_fair+0x57/0x60
  [  364.123025]  [<ffffffff810b2d6c>] ? __enqueue_entity+0x6c/0x70
  [  364.123028]  [<ffffffff810b8937>] ? enqueue_entity+0x3a7/0xd10
  [  364.123031]  [<ffffffff810b934a>] ? enqueue_task_fair+0xaa/0x8b0
  [  364.123036]  [<ffffffff81037ef9>] ? sched_clock+0x9/0x10
  [  364.123040]  [<ffffffff810b1d9f>] ? sched_clock_cpu+0x8f/0xa0
  [  364.123045]  [<ffffffff81223faf>] do_vfs_ioctl+0x29f/0x490
  [  364.123049]  [<ffffffff8108061c>] ? _do_fork+0xec/0x360
  [  364.123052]  [<ffffffff81224219>] SyS_ioctl+0x79/0x90
  [  364.123058]  [<ffffffff81843272>] entry_SYSCALL_64_fastpath+0x16/0x71
  [  364.123060] Code: 00 85 c0 89 c3 0f 88 a8 01 00 00 75 32 48 8b 85 78 ff ff 
ff 48 85 c0 0f 84 a2 01 00 00 48 8b 50 10 48 85 d2 75 08 e9 96 01 00 00 <48> 89 
c2 48 8b 42 10 48 85 c0 75 f4 49 8b 45 38 48 89 42 10 48 
  [  392.121285] NMI watchdog: BUG: soft lockup - CPU#12 stuck for 23s! 
[btrfs:12947]
  [  392.121744] Modules linked in: cfg80211 ipmi_ssif intel_rapl 
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass sb_edac 
edac_core hpilo 8250_fintek ipmi_si ipmi_msghandler lpc_ich shpchp 
acpi_power_meter ioatdma dca mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad 
ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 
btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx 
xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul 
crc32_pclmul ghash_clmulni_intel ses enclosure aesni_intel aes_x86_64 lrw 
gf128mul glue_helper ablk_helper cryptd tg3 ptp pps_core hpsa 
scsi_transport_sas wmi fjes
  [  392.121802] CPU: 12 PID: 12947 Comm: btrfs Tainted: G             L  
4.4.0-96-generic #119-Ubuntu
  [  392.121805] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, 
BIOS P89 12/27/2015
  [  392.121808] task: ffff880858118e00 ti: ffff880859eec000 task.ti: 
ffff880859eec000
  [  392.121810] RIP: 0010:[<ffffffffc0289504>]  [<ffffffffc0289504>] 
find_parent_nodes+0x5c4/0x7a0 [btrfs]
  [  392.121846] RSP: 0018:ffff880859eef928  EFLAGS: 00000286
  [  392.121848] RAX: ffff880837b461e0 RBX: 0000000000000000 RCX: 
ffff880859eef970
  [  392.121850] RDX: ffff880837b461c0 RSI: 0000000001c9c000 RDI: 
ffff8808500aff00
  [  392.121852] RBP: ffff880859eef9f8 R08: 0000000002400040 R09: 
000000018033000f
  [  392.121853] R10: ffff880834185dc0 R11: 000000000001a890 R12: 
ffff8808500aff00
  [  392.121855] R13: ffff880834185d20 R14: 0000000000000000 R15: 
ffff880859eefa50
  [  392.121858] FS:  00007f52288698c0(0000) GS:ffff88085f500000(0000) 
knlGS:0000000000000000
  [  392.121860] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  392.121862] CR2: 00007fdd1abdc0e0 CR3: 00000008547cd000 CR4: 
00000000003406e0
  [  392.121864] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [  392.121866] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [  392.121867] Stack:
  [  392.121869]  0000000000000000 ffff88085b318000 0000000000000000 
ffff8808500aff00
  [  392.121873]  ffff880859eefa50 0000000000c40000 0000000000000000 
ffff88085928ed80
  [  392.121876]  000000005928ecf0 ffff880857ad5600 0000000000001063 
ffff880859eef980
  [  392.121880] Call Trace:
  [  392.121905]  [<ffffffffc02911d0>] ? dir_changed.isra.15+0xa0/0xa0 [btrfs]
  [  392.121925]  [<ffffffffc028a3c9>] iterate_extent_inodes+0x109/0x350 [btrfs]
  [  392.121944]  [<ffffffffc028a018>] ? extent_from_logical+0x198/0x230 [btrfs]
  [  392.121963]  [<ffffffffc0295aa1>] process_extent+0x771/0x1000 [btrfs]
  [  392.121981]  [<ffffffffc0292960>] ? __record_deleted_ref+0x30/0x30 [btrfs]
  [  392.121999]  [<ffffffffc0297021>] changed_cb+0x231/0xad0 [btrfs]
  [  392.122017]  [<ffffffffc02989f4>] btrfs_ioctl_send+0x1134/0x1210 [btrfs]
  [  392.122039]  [<ffffffffc025f083>] btrfs_ioctl+0x2a3/0x28b0 [btrfs]
  [  392.122044]  [<ffffffff810b4e67>] ? task_move_group_fair+0x57/0x60
  [  392.122050]  [<ffffffff810b2d6c>] ? __enqueue_entity+0x6c/0x70
  [  392.122053]  [<ffffffff810b8937>] ? enqueue_entity+0x3a7/0xd10
  [  392.122056]  [<ffffffff810b934a>] ? enqueue_task_fair+0xaa/0x8b0
  [  392.122060]  [<ffffffff81037ef9>] ? sched_clock+0x9/0x10
  [  392.122064]  [<ffffffff810b1d9f>] ? sched_clock_cpu+0x8f/0xa0
  [  392.122069]  [<ffffffff81223faf>] do_vfs_ioctl+0x29f/0x490
  [  392.122073]  [<ffffffff8108061c>] ? _do_fork+0xec/0x360
  [  392.122076]  [<ffffffff81224219>] SyS_ioctl+0x79/0x90
  [  392.122081]  [<ffffffff81843272>] entry_SYSCALL_64_fastpath+0x16/0x71
  [  392.122083] Code: a8 01 00 00 75 32 48 8b 85 78 ff ff ff 48 85 c0 0f 84 a2 
01 00 00 48 8b 50 10 48 85 d2 75 08 e9 96 01 00 00 48 89 c2 48 8b 42 10 <48> 85 
c0 75 f4 49 8b 45 38 48 89 42 10 48 c7 85 78 ff ff ff 00 
  [  399.409025] INFO: rcu_sched self-detected stall on CPU
  [  399.410066]        12-...: (14999 ticks this GP) 
idle=fe5/140000000000001/0 softirq=4506/4506 fqs=14998 
  [  399.410907]         (t=15000 jiffies g=5362 c=5361 q=333)
  [  399.411226] Task dump for CPU 12:
  [  399.411229] btrfs           R  running task        0 12947   8601 
0x00000008
  [  399.411233]  ffff880858118e00 7d3693218f1b3cab ffff88085f503da8 
ffffffff810aedd9
  [  399.411237]  000000000000000c ffffffff81e52e00 ffff88085f503dc0 
ffffffff810b16b7
  [  399.411240]  000000000000000d ffff88085f503df0 ffffffff810e527e 
ffff88085f517b80
  [  399.411244] Call Trace:
  [  399.411246]  <IRQ>  [<ffffffff810aedd9>] sched_show_task+0xa9/0x110
  [  399.411260]  [<ffffffff810b16b7>] dump_cpu_task+0x37/0x40
  [  399.411265]  [<ffffffff810e527e>] rcu_dump_cpu_stacks+0x8e/0xe0
  [  399.411268]  [<ffffffff810e901a>] rcu_check_callbacks+0x4fa/0x7f0
  [  399.411275]  [<ffffffff81140d1c>] ? acct_account_cputime+0x1c/0x20
  [  399.411280]  [<ffffffff810b215f>] ? account_system_time+0x7f/0x110
  [  399.411285]  [<ffffffff810ff300>] ? tick_sched_handle.isra.14+0x60/0x60
  [  399.411289]  [<ffffffff810ef5c9>] update_process_times+0x39/0x60
  [  399.411292]  [<ffffffff810ff2c5>] tick_sched_handle.isra.14+0x25/0x60
  [  399.411296]  [<ffffffff810ff33d>] tick_sched_timer+0x3d/0x70
  [  399.411300]  [<ffffffff810eff02>] __hrtimer_run_queues+0x102/0x290
  [  399.411303]  [<ffffffff810f06c8>] hrtimer_interrupt+0xa8/0x1a0
  [  399.411308]  [<ffffffff81053078>] local_apic_timer_interrupt+0x38/0x60
  [  399.411314]  [<ffffffff81845d1d>] smp_apic_timer_interrupt+0x3d/0x50
  [  399.411319]  [<ffffffff81843fe2>] apic_timer_interrupt+0x82/0x90
  [  399.411321]  <EOI>  [<ffffffffc0289500>] ? find_parent_nodes+0x5c0/0x7a0 
[btrfs]
  [  399.411377]  [<ffffffffc02894d3>] ? find_parent_nodes+0x593/0x7a0 [btrfs]
  [  399.411397]  [<ffffffffc02911d0>] ? dir_changed.isra.15+0xa0/0xa0 [btrfs]
  [  399.411417]  [<ffffffffc028a3c9>] iterate_extent_inodes+0x109/0x350 [btrfs]
  [  399.411435]  [<ffffffffc028a018>] ? extent_from_logical+0x198/0x230 [btrfs]
  [  399.411454]  [<ffffffffc0295aa1>] process_extent+0x771/0x1000 [btrfs]
  [  399.411472]  [<ffffffffc0292960>] ? __record_deleted_ref+0x30/0x30 [btrfs]
  [  399.411489]  [<ffffffffc0297021>] changed_cb+0x231/0xad0 [btrfs]
  [  399.411507]  [<ffffffffc02989f4>] btrfs_ioctl_send+0x1134/0x1210 [btrfs]
  [  399.411528]  [<ffffffffc025f083>] btrfs_ioctl+0x2a3/0x28b0 [btrfs]
  [  399.411531]  [<ffffffff810b4e67>] ? task_move_group_fair+0x57/0x60
  [  399.411536]  [<ffffffff810b2d6c>] ? __enqueue_entity+0x6c/0x70
  [  399.411539]  [<ffffffff810b8937>] ? enqueue_entity+0x3a7/0xd10
  [  399.411542]  [<ffffffff810b934a>] ? enqueue_task_fair+0xaa/0x8b0
  [  399.411545]  [<ffffffff81037ef9>] ? sched_clock+0x9/0x10
  [  399.411549]  [<ffffffff810b1d9f>] ? sched_clock_cpu+0x8f/0xa0
  [  399.411554]  [<ffffffff81223faf>] do_vfs_ioctl+0x29f/0x490
  [  399.411558]  [<ffffffff8108061c>] ? _do_fork+0xec/0x360
  [  399.411561]  [<ffffffff81224219>] SyS_ioctl+0x79/0x90
  [  399.411566]  [<ffffffff81843272>] entry_SYSCALL_64_fastpath+0x16/0x71
  [  424.120155] NMI watchdog: BUG: soft lockup - CPU#12 stuck for 22s! 
[btrfs:12947]
  [  424.120588] Modules linked in: cfg80211 ipmi_ssif intel_rapl 
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass sb_edac 
edac_core hpilo 8250_fintek ipmi_si ipmi_msghandler lpc_ich shpchp 
acpi_power_meter ioatdma dca mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad 
ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 
btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx 
xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul 
crc32_pclmul ghash_clmulni_intel ses enclosure aesni_intel aes_x86_64 lrw 
gf128mul glue_helper ablk_helper cryptd tg3 ptp pps_core hpsa 
scsi_transport_sas wmi fjes
  [  424.120648] CPU: 12 PID: 12947 Comm: btrfs Tainted: G             L  
4.4.0-96-generic #119-Ubuntu
  [  424.120650] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, 
BIOS P89 12/27/2015
  [  424.120653] task: ffff880858118e00 ti: ffff880859eec000 task.ti: 
ffff880859eec000
  [  424.120655] RIP: 0010:[<ffffffffc0289504>]  [<ffffffffc0289504>] 
find_parent_nodes+0x5c4/0x7a0 [btrfs]
  [  424.120692] RSP: 0018:ffff880859eef928  EFLAGS: 00000282
  [  424.120694] RAX: ffff880835ae5ea0 RBX: 0000000000000000 RCX: 
ffff880859eef970
  [  424.120696] RDX: ffff880835ae5e80 RSI: 0000000001cac000 RDI: 
ffff8808500aff00
  [  424.120698] RBP: ffff880859eef9f8 R08: 0000000002400040 R09: 
0000000180330031
  [  424.120700] R10: ffff880078187410 R11: 000000000001a890 R12: 
ffff8808500aff00
  [  424.120702] R13: ffff880078187370 R14: 0000000000000000 R15: 
ffff880859eefa50
  [  424.120704] FS:  00007f52288698c0(0000) GS:ffff88085f500000(0000) 
knlGS:0000000000000000
  [  424.120706] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  424.120708] CR2: 00007fdd1abdc0e0 CR3: 00000008547cd000 CR4: 
00000000003406e0
  [  424.120710] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [  424.120712] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [  424.120714] Stack:
  [  424.120715]  0000000000000000 ffff88085b318000 0000000000000000 
ffff8808500aff00
  [  424.120719]  ffff880859eefa50 0000000000c40000 0000000000000000 
ffff88085928ed80
  [  424.120723]  000000005928ecf0 ffff8808555f7400 0000000000001063 
ffff880859eef980
  [  424.120726] Call Trace:
  [  424.120750]  [<ffffffffc02911d0>] ? dir_changed.isra.15+0xa0/0xa0 [btrfs]
  [  424.120771]  [<ffffffffc028a3c9>] iterate_extent_inodes+0x109/0x350 [btrfs]
  [  424.120790]  [<ffffffffc028a018>] ? extent_from_logical+0x198/0x230 [btrfs]
  [  424.120809]  [<ffffffffc0295aa1>] process_extent+0x771/0x1000 [btrfs]
  [  424.120827]  [<ffffffffc0292960>] ? __record_deleted_ref+0x30/0x30 [btrfs]
  [  424.120845]  [<ffffffffc0297021>] changed_cb+0x231/0xad0 [btrfs]
  [  424.120862]  [<ffffffffc02989f4>] btrfs_ioctl_send+0x1134/0x1210 [btrfs]
  [  424.120883]  [<ffffffffc025f083>] btrfs_ioctl+0x2a3/0x28b0 [btrfs]
  [  424.120889]  [<ffffffff810b4e67>] ? task_move_group_fair+0x57/0x60
  [  424.120895]  [<ffffffff810b2d6c>] ? __enqueue_entity+0x6c/0x70
  [  424.120898]  [<ffffffff810b8937>] ? enqueue_entity+0x3a7/0xd10
  [  424.120901]  [<ffffffff810b934a>] ? enqueue_task_fair+0xaa/0x8b0
  [  424.120905]  [<ffffffff81037ef9>] ? sched_clock+0x9/0x10
  [  424.120909]  [<ffffffff810b1d9f>] ? sched_clock_cpu+0x8f/0xa0
  [  424.120914]  [<ffffffff81223faf>] do_vfs_ioctl+0x29f/0x490
  [  424.120918]  [<ffffffff8108061c>] ? _do_fork+0xec/0x360
  [  424.120921]  [<ffffffff81224219>] SyS_ioctl+0x79/0x90
  [  424.120927]  [<ffffffff81843272>] entry_SYSCALL_64_fastpath+0x16/0x71
  [  424.120928] Code: a8 01 00 00 75 32 48 8b 85 78 ff ff ff 48 85 c0 0f 84 a2 
01 00 00 48 8b 50 10 48 85 d2 75 08 e9 96 01 00 00 48 89 c2 48 8b 42 10 <48> 85 
c0 75 f4 49 8b 45 38 48 89 42 10 48 c7 85 78 ff ff ff 00

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-96-generic 4.4.0-96.119
  ProcVersionSignature: User Name 4.4.0-96.119-generic 4.4.83
  Uname: Linux 4.4.0-96-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Sep 22 11:37 seq
   crw-rw---- 1 root audio 116, 33 Sep 22 11:37 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  Date: Fri Sep 22 11:43:07 2017
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: HP ProLiant DL360 Gen9
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-96-generic 
root=UUID=051b34ce-dfed-4e36-aa78-851c5a284ee4 ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-96-generic N/A
   linux-backports-modules-4.4.0-96-generic  N/A
   linux-firmware                            1.157.12
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/27/2015
  dmi.bios.vendor: HP
  dmi.bios.version: P89
  dmi.board.name: ProLiant DL360 Gen9
  dmi.board.vendor: HP
  dmi.chassis.type: 23
  dmi.chassis.vendor: HP
  dmi.modalias: 
dmi:bvnHP:bvrP89:bd12/27/2015:svnHP:pnProLiantDL360Gen9:pvr:rvnHP:rnProLiantDL360Gen9:rvr:cvnHP:ct23:cvr:
  dmi.product.name: ProLiant DL360 Gen9
  dmi.sys.vendor: HP

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