[ 600.057041] INFO: task mount:1482 blocked for more than 200 seconds. [ 600.057047] Tainted: P O 4.4.79.x86_64.1 #1 [ 600.057049] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 600.057051] mount D ffff880078f9f858 0 1482 1 0x00000000 [ 600.057056] ffff880078f9f858 ffff88007c0ed400 ffff880078fa0000 ffff880078fcf1f0 [ 600.057060] ffff880078fcf000 ffff880078fcf1f0 0000000000000001 ffff880078f9f870 [ 600.057063] ffffffff88a55710 ffff8800646341b8 ffff880078f9f8b8 ffffffff882f1f55 [ 600.057067] Call Trace: [ 600.057076] [] schedule+0x30/0x80 [ 600.057080] [] wait_current_trans.isra.22+0x95/0xf0 [ 600.057084] [] ? wait_woken+0x80/0x80 [ 600.057087] [] start_transaction+0x2f8/0x440 [ 600.057090] [] btrfs_start_transaction+0x19/0x20 [ 600.057094] [] btrfs_drop_snapshot+0x4f1/0x860 [ 600.057097] [] ? btrfs_commit_transaction.part.25+0xa57/0xa80 [ 600.057101] [] merge_reloc_roots+0xd7/0x220 [ 600.057104] [] btrfs_recover_relocation+0x35e/0x3b0 [ 600.057107] [] open_ctree+0x2201/0x25a0 [ 600.057111] [] ? vsnprintf+0x115/0x510 [ 600.057115] [] btrfs_mount+0x9d4/0xb50 [ 600.057118] [] ? find_next_bit+0x15/0x20 [ 600.057122] [] mount_fs+0x33/0x160 [ 600.057126] [] ? __alloc_percpu+0x10/0x20 [ 600.057129] [] vfs_kern_mount+0x62/0x100 [ 600.057132] [] btrfs_mount+0x1cf/0xb50 [ 600.057135] [] ? find_next_bit+0x15/0x20 [ 600.057137] [] ? pcpu_alloc+0x33f/0x630 [ 600.057140] [] mount_fs+0x33/0x160 [ 600.057143] [] ? __alloc_percpu+0x10/0x20 [ 600.057145] [] vfs_kern_mount+0x62/0x100 [ 600.057148] [] do_mount+0x208/0xd20 [ 600.057152] [] ? __kmalloc_track_caller+0x25/0x190 [ 600.057155] [] ? strndup_user+0x3c/0x90 [ 600.057158] [] SyS_mount+0x6a/0xb0 [ 600.057161] [] entry_SYSCALL_64_fastpath+0x12/0x6a [ 600.057175] INFO: task readynasd:3117 blocked for more than 200 seconds. [ 600.057177] Tainted: P O 4.4.79.x86_64.1 #1 [ 600.057178] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 600.057180] readynasd D ffff880069523e38 0 3117 1 0x00000000 [ 600.057183] ffff880069523e38 ffff880069665e80 ffff880069524000 ffff880078fce870 [ 600.057187] 0000000000000000 ffffffff88169ec0 ffff880078fce870 ffff880069523e50 [ 600.057190] ffffffff88a55710 ffff880069665e80 ffff880069523ea0 ffffffff88a57554 [ 600.057193] Call Trace: [ 600.057197] [] ? SyS_tee+0x3c0/0x3c0 [ 600.057200] [] schedule+0x30/0x80 [ 600.057203] [] rwsem_down_read_failed+0xd4/0x110 [ 600.057206] [] ? sync_inodes_sb+0x178/0x1c0 [ 600.057209] [] call_rwsem_down_read_failed+0x14/0x30 [ 600.057213] [] ? btrfs_put_ordered_extent+0x11/0x80 [ 600.057216] [] ? down_read+0x12/0x20 [ 600.057218] [] iterate_supers+0x8e/0xf0 [ 600.057221] [] sys_sync+0x30/0x90 [ 600.057224] [] entry_SYSCALL_64_fastpath+0x12/0x6a [ 800.057044] INFO: task mount:1482 blocked for more than 200 seconds. [ 800.057050] Tainted: P O 4.4.79.x86_64.1 #1 [ 800.057052] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 800.057054] mount D ffff880078f9f858 0 1482 1 0x00000004 [ 800.057059] ffff880078f9f858 ffff88007c0ed400 ffff880078fa0000 ffff880078fcf1f0 [ 800.057063] ffff880078fcf000 ffff880078fcf1f0 0000000000000001 ffff880078f9f870 [ 800.057066] ffffffff88a55710 ffff8800646341b8 ffff880078f9f8b8 ffffffff882f1f55 [ 800.057070] Call Trace: [ 800.057078] [] schedule+0x30/0x80 [ 800.057083] [] wait_current_trans.isra.22+0x95/0xf0 [ 800.057087] [] ? wait_woken+0x80/0x80 [ 800.057090] [] start_transaction+0x2f8/0x440 [ 800.057093] [] btrfs_start_transaction+0x19/0x20 [ 800.057097] [] btrfs_drop_snapshot+0x4f1/0x860 [ 800.057100] [] ? btrfs_commit_transaction.part.25+0xa57/0xa80 [ 800.057104] [] merge_reloc_roots+0xd7/0x220 [ 800.057107] [] btrfs_recover_relocation+0x35e/0x3b0 [ 800.057110] [] open_ctree+0x2201/0x25a0 [ 800.057113] [] ? vsnprintf+0x115/0x510 [ 800.057117] [] btrfs_mount+0x9d4/0xb50 [ 800.057121] [] ? find_next_bit+0x15/0x20 [ 800.057125] [] mount_fs+0x33/0x160 [ 800.057128] [] ? __alloc_percpu+0x10/0x20 [ 800.057132] [] vfs_kern_mount+0x62/0x100 [ 800.057135] [] btrfs_mount+0x1cf/0xb50 [ 800.057137] [] ? find_next_bit+0x15/0x20 [ 800.057140] [] ? pcpu_alloc+0x33f/0x630 [ 800.057143] [] mount_fs+0x33/0x160 [ 800.057145] [] ? __alloc_percpu+0x10/0x20 [ 800.057148] [] vfs_kern_mount+0x62/0x100 [ 800.057151] [] do_mount+0x208/0xd20 [ 800.057155] [] ? __kmalloc_track_caller+0x25/0x190 [ 800.057157] [] ? strndup_user+0x3c/0x90 [ 800.057160] [] SyS_mount+0x6a/0xb0 [ 800.057164] [] entry_SYSCALL_64_fastpath+0x12/0x6a [ 800.057178] INFO: task readynasd:3117 blocked for more than 200 seconds. [ 800.057180] Tainted: P O 4.4.79.x86_64.1 #1 [ 800.057181] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 800.057184] readynasd D ffff880069523e38 0 3117 1 0x00000004 [ 800.057187] ffff880069523e38 ffff880069665e80 ffff880069524000 ffff880078fce870 [ 800.057190] 0000000000000000 ffffffff88169ec0 ffff880078fce870 ffff880069523e50 [ 800.057194] ffffffff88a55710 ffff880069665e80 ffff880069523ea0 ffffffff88a57554 [ 800.057197] Call Trace: [ 800.057201] [] ? SyS_tee+0x3c0/0x3c0 [ 800.057204] [] schedule+0x30/0x80 [ 800.057207] [] rwsem_down_read_failed+0xd4/0x110 [ 800.057210] [] ? sync_inodes_sb+0x178/0x1c0 [ 800.057213] [] call_rwsem_down_read_failed+0x14/0x30 [ 800.057217] [] ? btrfs_put_ordered_extent+0x11/0x80 [ 800.057219] [] ? down_read+0x12/0x20 [ 800.057222] [] iterate_supers+0x8e/0xf0 [ 800.057225] [] sys_sync+0x30/0x90 [ 800.057228] [] entry_SYSCALL_64_fastpath+0x12/0x6a [ 1000.057081] INFO: task readynasd:3117 blocked for more than 200 seconds. [ 1000.057089] Tainted: P O 4.4.79.x86_64.1 #1 [ 1000.057091] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1000.057093] readynasd D ffff880069523e38 0 3117 1 0x00000004 [ 1000.057099] ffff880069523e38 ffff880069665e80 ffff880069524000 ffff880078fce870 [ 1000.057103] 0000000000000000 ffffffff88169ec0 ffff880078fce870 ffff880069523e50 [ 1000.057107] ffffffff88a55710 ffff880069665e80 ffff880069523ea0 ffffffff88a57554 [ 1000.057110] Call Trace: [ 1000.057121] [] ? SyS_tee+0x3c0/0x3c0 [ 1000.057126] [] schedule+0x30/0x80 [ 1000.057129] [] rwsem_down_read_failed+0xd4/0x110 [ 1000.057132] [] ? sync_inodes_sb+0x178/0x1c0 [ 1000.057137] [] call_rwsem_down_read_failed+0x14/0x30 [ 1000.057141] [] ? btrfs_put_ordered_extent+0x11/0x80 [ 1000.057144] [] ? down_read+0x12/0x20 [ 1000.057148] [] iterate_supers+0x8e/0xf0 [ 1000.057150] [] sys_sync+0x30/0x90 [ 1000.057154] [] entry_SYSCALL_64_fastpath+0x12/0x6a [ 1200.057049] INFO: task readynasd:3117 blocked for more than 200 seconds. [ 1200.057055] Tainted: P O 4.4.79.x86_64.1 #1 [ 1200.057057] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1200.057059] readynasd D ffff880069523e38 0 3117 1 0x00000004 [ 1200.057064] ffff880069523e38 ffff880069665e80 ffff880069524000 ffff880078fce870 [ 1200.057068] 0000000000000000 ffffffff88169ec0 ffff880078fce870 ffff880069523e50 [ 1200.057072] ffffffff88a55710 ffff880069665e80 ffff880069523ea0 ffffffff88a57554 [ 1200.057075] Call Trace: [ 1200.057084] [] ? SyS_tee+0x3c0/0x3c0 [ 1200.057089] [] schedule+0x30/0x80 [ 1200.057093] [] rwsem_down_read_failed+0xd4/0x110 [ 1200.057096] [] ? sync_inodes_sb+0x178/0x1c0 [ 1200.057100] [] call_rwsem_down_read_failed+0x14/0x30 [ 1200.057104] [] ? btrfs_put_ordered_extent+0x11/0x80 [ 1200.057107] [] ? down_read+0x12/0x20 [ 1200.057110] [] iterate_supers+0x8e/0xf0 [ 1200.057113] [] sys_sync+0x30/0x90 [ 1200.057117] [] entry_SYSCALL_64_fastpath+0x12/0x6a [ 1400.057049] INFO: task readynasd:3117 blocked for more than 200 seconds. [ 1400.057055] Tainted: P O 4.4.79.x86_64.1 #1 [ 1400.057057] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1400.057060] readynasd D ffff880069523e38 0 3117 1 0x00000004 [ 1400.057065] ffff880069523e38 ffff880069665e80 ffff880069524000 ffff880078fce870 [ 1400.057069] 0000000000000000 ffffffff88169ec0 ffff880078fce870 ffff880069523e50 [ 1400.057073] ffffffff88a55710 ffff880069665e80 ffff880069523ea0 ffffffff88a57554 [ 1400.057076] Call Trace: [ 1400.057085] [] ? SyS_tee+0x3c0/0x3c0 [ 1400.057090] [] schedule+0x30/0x80 [ 1400.057093] [] rwsem_down_read_failed+0xd4/0x110 [ 1400.057096] [] ? sync_inodes_sb+0x178/0x1c0 [ 1400.057101] [] call_rwsem_down_read_failed+0x14/0x30 [ 1400.057105] [] ? btrfs_put_ordered_extent+0x11/0x80 [ 1400.057108] [] ? down_read+0x12/0x20 [ 1400.057111] [] iterate_supers+0x8e/0xf0 [ 1400.057114] [] sys_sync+0x30/0x90 [ 1400.057118] [] entry_SYSCALL_64_fastpath+0x12/0x6a [ 1400.057121] INFO: task btrfs-transacti:3249 blocked for more than 200 seconds. [ 1400.057124] Tainted: P O 4.4.79.x86_64.1 #1 [ 1400.057125] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1400.057127] btrfs-transacti D ffff880058243db8 0 3249 2 0x00000000 [ 1400.057131] ffff880058243db8 ffff880069661500 ffff880058244000 ffff880078fcf1f0 [ 1400.057134] ffff880078fcf000 ffff880078fcf1f0 0000000000000000 ffff880058243dd0 [ 1400.057137] ffffffff88a55710 ffff88007cb82370 ffff880058243e18 ffffffff882f1f55 [ 1400.057141] Call Trace: [ 1400.057143] [] schedule+0x30/0x80 [ 1400.057147] [] wait_current_trans.isra.22+0x95/0xf0 [ 1400.057151] [] ? wait_woken+0x80/0x80 [ 1400.057154] [] start_transaction+0x287/0x440 [ 1400.057157] [] btrfs_attach_transaction+0x18/0x20 [ 1400.057160] [] transaction_kthread+0x82/0x230 [ 1400.057162] [] ? btrfs_cleanup_transaction+0x4a0/0x4a0 [ 1400.057166] [] kthread+0xe6/0x100 [ 1400.057169] [] ? kthread_create_on_node+0x170/0x170 [ 1400.057172] [] ret_from_fork+0x3f/0x70 [ 1400.057175] [] ? kthread_create_on_node+0x170/0x170 [ 9425.752545] BTRFS info (device md127): force skipping balance [ 9425.752551] BTRFS info (device md127): checking UUID tree [ 9425.752558] BTRFS warning (device md127): failed to start uuid_rescan task [ 9425.752561] BTRFS warning (device md127): failed to check the UUID tree: -4 [ 9426.354059] BTRFS error (device md127): open_ctree failed [ 9442.338657] nfsd: last server has exited, flushing export cache [ 9442.416089] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory [ 9442.416118] NFSD: starting 90-second grace period (net ffffffff88f07bc0)