[Tue Aug 25 16:41:16 2020] sysrq: Show Blocked State
[Tue Aug 25 16:41:16 2020]   task                        PC stack   pid father

[Tue Aug 25 16:41:16 2020] md1_reclaim     D    0   806      2 0x80004000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  ? __switch_to_asm+0x34/0x70
[Tue Aug 25 16:41:16 2020]  ? __switch_to_asm+0x34/0x70
[Tue Aug 25 16:41:16 2020]  ? wbt_exit+0x30/0x30
[Tue Aug 25 16:41:16 2020]  ? __wbt_done+0x30/0x30
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  io_schedule+0x12/0x40
[Tue Aug 25 16:41:16 2020]  rq_qos_wait+0xfa/0x170
[Tue Aug 25 16:41:16 2020]  ? __switch_to_asm+0x34/0x70
[Tue Aug 25 16:41:16 2020]  ? karma_partition+0x1e0/0x1e0
[Tue Aug 25 16:41:16 2020]  ? wbt_exit+0x30/0x30
[Tue Aug 25 16:41:16 2020]  wbt_wait+0x98/0xe0
[Tue Aug 25 16:41:16 2020]  __rq_qos_throttle+0x23/0x30
[Tue Aug 25 16:41:16 2020]  blk_mq_make_request+0x12a/0x5d0
[Tue Aug 25 16:41:16 2020]  generic_make_request+0xcf/0x310
[Tue Aug 25 16:41:16 2020]  submit_bio+0x42/0x1c0
[Tue Aug 25 16:41:16 2020]  ? md_super_write.part.70+0x98/0x120 [md_mod]
[Tue Aug 25 16:41:16 2020]  md_update_sb.part.71+0x3c0/0x8f0 [md_mod]
[Tue Aug 25 16:41:16 2020]  r5l_do_reclaim+0x32a/0x3b0 [raid456]
[Tue Aug 25 16:41:16 2020]  ? schedule_timeout+0x162/0x340
[Tue Aug 25 16:41:16 2020]  ? prepare_to_wait_event+0xb6/0x140
[Tue Aug 25 16:41:16 2020]  ? md_register_thread+0xd0/0xd0 [md_mod]
[Tue Aug 25 16:41:16 2020]  md_thread+0x94/0x150 [md_mod]
[Tue Aug 25 16:41:16 2020]  ? finish_wait+0x80/0x80
[Tue Aug 25 16:41:16 2020]  kthread+0x112/0x130
[Tue Aug 25 16:41:16 2020]  ? kthread_park+0x80/0x80
[Tue Aug 25 16:41:16 2020]  ret_from_fork+0x22/0x40

[Tue Aug 25 16:41:16 2020] btrfs-transacti D    0   893      2 0x80004000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  io_schedule+0x12/0x40
[Tue Aug 25 16:41:16 2020]  wait_on_page_bit+0x15c/0x230
[Tue Aug 25 16:41:16 2020]  ? file_fdatawait_range+0x20/0x20
[Tue Aug 25 16:41:16 2020]  __filemap_fdatawait_range+0x89/0xf0
[Tue Aug 25 16:41:16 2020]  filemap_fdatawait_range+0xe/0x20
[Tue Aug 25 16:41:16 2020]  __btrfs_wait_marked_extents.isra.19+0xc2/0x100 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_write_and_wait_transaction.isra.23+0x67/0xd0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_commit_transaction+0x755/0xa50 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? start_transaction+0xd5/0x540 [btrfs]
[Tue Aug 25 16:41:16 2020]  transaction_kthread+0x144/0x170 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? btrfs_cleanup_transaction+0x590/0x590 [btrfs]
[Tue Aug 25 16:41:16 2020]  kthread+0x112/0x130
[Tue Aug 25 16:41:16 2020]  ? kthread_park+0x80/0x80
[Tue Aug 25 16:41:16 2020]  ret_from_fork+0x22/0x40

[Tue Aug 25 16:41:16 2020] btrfs           D    0 30168  30162 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  wait_for_commit+0x58/0x80 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? finish_wait+0x80/0x80
[Tue Aug 25 16:41:16 2020]  btrfs_commit_transaction+0x169/0xa50 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? btrfs_record_root_in_trans+0x56/0x60 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? start_transaction+0xd5/0x540 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_mksubvol+0x2e9/0x450 [btrfs]
[Tue Aug 25 16:41:16 2020]  __btrfs_ioctl_snap_create+0x167/0x170 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_create_v2+0xc5/0xe0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xf61/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7f273259b427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007ffe48178418 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f273259b427
[Tue Aug 25 16:41:16 2020] RDX: 00007ffe48178458 RSI: 0000000050009417 RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 00005637741dc260 R08: 0000000000000008 R09: 0000000035322d38
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000206 R12: 00005637741dc2b0
[Tue Aug 25 16:41:16 2020] R13: 00005637741dc2b0 R14: 0000000000000003 R15: 0000000000000004

[Tue Aug 25 16:41:16 2020] btrfs           D    0 31094  31088 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7ff3fa6a3427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007ffe92fc4058 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff3fa6a3427
[Tue Aug 25 16:41:16 2020] RDX: 00007ffe92fc4090 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 000055b4e34ab2ca R09: 00007ff3fa72de80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000202 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007ffe92fc4090 R15: 000055b4e34ab2ca

[Tue Aug 25 16:41:16 2020] btrfs           D    0 31357  31351 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7f9c14290427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007fff4c9f8ed8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9c14290427
[Tue Aug 25 16:41:16 2020] RDX: 00007fff4c9f8f10 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 000055ea83aa82c8 R09: 00007f9c1431ae80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000206 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007fff4c9f8f10 R15: 000055ea83aa82c8

[Tue Aug 25 16:41:16 2020] btrfs           D    0 32277  32271 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7f0b35736427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007fff96ad7c48 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0b35736427
[Tue Aug 25 16:41:16 2020] RDX: 00007fff96ad7c80 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 000055e2598b62c8 R09: 00007f0b357c0e80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000206 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007fff96ad7c80 R15: 000055e2598b62c8

[Tue Aug 25 16:41:16 2020] btrfs           D    0 32451  32445 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7f0517ff8427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007ffc862d3c98 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0517ff8427
[Tue Aug 25 16:41:16 2020] RDX: 00007ffc862d3cd0 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 0000555d6d7872ca R09: 00007f0518082e80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000202 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007ffc862d3cd0 R15: 0000555d6d7872ca

[Tue Aug 25 16:41:16 2020] btrfs           D    0   596    590 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7ffa2b954427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007ffc88d95748 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ffa2b954427
[Tue Aug 25 16:41:16 2020] RDX: 00007ffc88d95780 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 0000558d2b97f2c8 R09: 00007ffa2b9dee80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000206 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007ffc88d95780 R15: 0000558d2b97f2c8

[Tue Aug 25 16:41:16 2020] btrfs           D    0   792    786 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7f74f06d2427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007fffbb878738 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f74f06d2427
[Tue Aug 25 16:41:16 2020] RDX: 00007fffbb878770 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 000055f062e442c7 R09: 00007f74f075ce80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000202 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007fffbb878770 R15: 000055f062e442c7

[Tue Aug 25 16:41:16 2020] btrfs           D    0   833    827 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7f65fee13427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007ffc45aa0508 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f65fee13427
[Tue Aug 25 16:41:16 2020] RDX: 00007ffc45aa0540 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 000055d819de32c6 R09: 00007f65fee9de80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000202 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007ffc45aa0540 R15: 000055d819de32c6

[Tue Aug 25 16:41:16 2020] btrfs           D    0 10542  10515 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7f48b0d4a427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007ffdf1ab4fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f48b0d4a427
[Tue Aug 25 16:41:16 2020] RDX: 00007ffdf1ab5010 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 00005631cce8a2c8 R09: 00007f48b0dd4e80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000206 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007ffdf1ab5010 R15: 00005631cce8a2c8

[Tue Aug 25 16:41:16 2020] btrfs           D    0  1667   1661 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7f759eff1427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007ffcc4fb06c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f759eff1427
[Tue Aug 25 16:41:16 2020] RDX: 00007ffcc4fb0700 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 00005584f7c5a2ca R09: 00007f759f07be80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000202 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007ffcc4fb0700 R15: 00005584f7c5a2ca

[Tue Aug 25 16:41:16 2020] btrfs           D    0  2473   2467 0x00000000
[Tue Aug 25 16:41:16 2020] Call Trace:
[Tue Aug 25 16:41:16 2020]  __schedule+0x2dd/0x710
[Tue Aug 25 16:41:16 2020]  schedule+0x40/0xb0
[Tue Aug 25 16:41:16 2020]  rwsem_down_write_slowpath+0x329/0x4e0
[Tue Aug 25 16:41:16 2020]  ? kmem_cache_alloc_trace+0x15e/0x230
[Tue Aug 25 16:41:16 2020]  btrfs_delete_subvolume+0x90/0x5f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? d_lookup+0x25/0x50
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl_snap_destroy+0x5b3/0x6f0 [btrfs]
[Tue Aug 25 16:41:16 2020]  btrfs_ioctl+0xa5f/0x2ef0 [btrfs]
[Tue Aug 25 16:41:16 2020]  ? ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  ksys_ioctl+0x86/0xc0
[Tue Aug 25 16:41:16 2020]  __x64_sys_ioctl+0x16/0x20
[Tue Aug 25 16:41:16 2020]  do_syscall_64+0x52/0x170
[Tue Aug 25 16:41:16 2020]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Tue Aug 25 16:41:16 2020] RIP: 0033:0x7f278ea1a427
[Tue Aug 25 16:41:16 2020] Code: Bad RIP value.
[Tue Aug 25 16:41:16 2020] RSP: 002b:00007ffd784d5318 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[Tue Aug 25 16:41:16 2020] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f278ea1a427
[Tue Aug 25 16:41:16 2020] RDX: 00007ffd784d5350 RSI: 000000005000940f RDI: 0000000000000003
[Tue Aug 25 16:41:16 2020] RBP: 0000000000000000 R08: 000055b8f4d412de R09: 00007f278eaa4e80
[Tue Aug 25 16:41:16 2020] R10: fffffffffffffb66 R11: 0000000000000206 R12: 0000000000000003
[Tue Aug 25 16:41:16 2020] R13: 0000000000000003 R14: 00007ffd784d5350 R15: 000055b8f4d412de