Comment # 4 on bug 1199322 from 
Happened again this AM.
kernel:   Linux turnip 5.3.18-150300.59.68-default



Jun 20 08:28:14 turnip kernel: sysrq: Show Blocked State
Jun 20 08:28:14 turnip kernel: task:btrfs-transacti state:D stack:    0 pid: 
770 ppid:     2 flags:0x80004000
Jun 20 08:28:14 turnip kernel: Call Trace:
Jun 20 08:28:14 turnip kernel:  __schedule+0x2ff/0x760
Jun 20 08:28:14 turnip kernel:  ? bit_wait+0x50/0x50
Jun 20 08:28:14 turnip kernel:  schedule+0x2f/0xa0
Jun 20 08:28:14 turnip kernel:  io_schedule+0x12/0x40
Jun 20 08:28:14 turnip kernel:  bit_wait_io+0xd/0x50
Jun 20 08:28:14 turnip kernel:  __wait_on_bit+0x2c/0x90
Jun 20 08:28:14 turnip kernel:  out_of_line_wait_on_bit+0x91/0xb0
Jun 20 08:28:14 turnip kernel:  ? init_wait_var_entry+0x50/0x50
Jun 20 08:28:14 turnip kernel:  write_all_supers+0x278/0xa00 [btrfs]
Jun 20 08:28:14 turnip kernel:  ? btrfs_commit_transaction+0x790/0xa60 [btrfs]
Jun 20 08:28:14 turnip kernel:  btrfs_commit_transaction+0x790/0xa60 [btrfs]
Jun 20 08:28:14 turnip kernel:  ? start_transaction+0xc5/0x540 [btrfs]
Jun 20 08:28:14 turnip kernel:  transaction_kthread+0x148/0x160 [btrfs]
Jun 20 08:28:14 turnip kernel:  ? btrfs_cleanup_transaction+0x5c0/0x5c0 [btrfs]
Jun 20 08:28:14 turnip kernel:  kthread+0x10d/0x130
Jun 20 08:28:14 turnip kernel:  ? kthread_park+0xa0/0xa0
Jun 20 08:28:14 turnip kernel:  ret_from_fork+0x35/0x40
Jun 20 08:28:14 turnip kernel: task:kworker/u12:6   state:D stack:    0
pid:25066 ppid:     2 flags:0x80004000
Jun 20 08:28:14 turnip kernel: Workqueue: writeback wb_workfn (flush-btrfs-2)
Jun 20 08:28:14 turnip kernel: Call Trace:
Jun 20 08:28:14 turnip kernel:  __schedule+0x2ff/0x760
Jun 20 08:28:14 turnip kernel:  schedule+0x2f/0xa0
Jun 20 08:28:14 turnip kernel:  btrfs_tree_lock+0x9d/0x1a0 [btrfs]
Jun 20 08:28:14 turnip kernel:  ? wait_woken+0x80/0x80
Jun 20 08:28:14 turnip kernel:  btrfs_search_slot+0x74e/0xa40 [btrfs]
Jun 20 08:28:14 turnip kernel:  btrfs_lookup_file_extent+0x4a/0x70 [btrfs]
Jun 20 08:28:14 turnip kernel:  __btrfs_drop_extents+0x171/0xe80 [btrfs]
Jun 20 08:28:14 turnip kernel:  cow_file_range_inline.constprop.77+0x4b9/0x6b0
[btrfs]
Jun 20 08:28:14 turnip kernel:  ? __set_extent_bit+0x2ff/0x690 [btrfs]
Jun 20 08:28:14 turnip kernel:  cow_file_range+0x2f1/0x460 [btrfs]
Jun 20 08:28:14 turnip kernel:  btrfs_run_delalloc_range+0x9c/0x4f0 [btrfs]
Jun 20 08:28:14 turnip kernel:  ? find_lock_delalloc_range+0x215/0x240 [btrfs]
Jun 20 08:28:14 turnip kernel:  writepage_delalloc+0xef/0x130 [btrfs]
Jun 20 08:28:14 turnip kernel:  __extent_writepage+0x19f/0x360 [btrfs]
Jun 20 08:28:14 turnip kernel:  extent_write_cache_pages+0x24b/0x3d0 [btrfs]
Jun 20 08:28:14 turnip kernel:  extent_writepages+0x52/0xb0 [btrfs]
Jun 20 08:28:14 turnip kernel:  do_writepages+0x4b/0xe0
Jun 20 08:28:14 turnip kernel:  ? update_load_avg+0x1ac/0x5f0
Jun 20 08:28:14 turnip kernel:  ? enqueue_entity+0x107/0x6f0
Jun 20 08:28:14 turnip kernel:  ? __writeback_single_inode+0x39/0x300
Jun 20 08:28:14 turnip kernel:  __writeback_single_inode+0x39/0x300
Jun 20 08:28:14 turnip kernel:  writeback_sb_inodes+0x1ad/0x4b0
Jun 20 08:28:14 turnip kernel:  __writeback_inodes_wb+0x5d/0xb0
Jun 20 08:28:14 turnip kernel:  wb_writeback+0x25e/0x2f0
Jun 20 08:28:14 turnip kernel:  ? wb_workfn+0x23c/0x4e0
Jun 20 08:28:14 turnip kernel:  wb_workfn+0x23c/0x4e0
Jun 20 08:28:14 turnip kernel:  ? __switch_to_asm+0x34/0x70
Jun 20 08:28:14 turnip kernel:  ? __switch_to_asm+0x34/0x70
Jun 20 08:28:14 turnip kernel:  ? __switch_to_asm+0x40/0x70
Jun 20 08:28:14 turnip kernel:  ? __switch_to_asm+0x34/0x70
Jun 20 08:28:14 turnip kernel:  ? __switch_to_asm+0x40/0x70
Jun 20 08:28:14 turnip kernel:  ? __switch_to_asm+0x34/0x70
Jun 20 08:28:14 turnip kernel:  ? __switch_to_asm+0x40/0x70
Jun 20 08:28:14 turnip kernel:  ? process_one_work+0x1f4/0x3e0
Jun 20 08:28:14 turnip kernel:  ? inode_wait_for_writeback+0x30/0x30
Jun 20 08:28:14 turnip kernel:  process_one_work+0x1f4/0x3e0
Jun 20 08:28:14 turnip kernel:  worker_thread+0x2d/0x3e0
Jun 20 08:28:14 turnip kernel:  ? process_one_work+0x3e0/0x3e0
Jun 20 08:28:14 turnip kernel:  kthread+0x10d/0x130
Jun 20 08:28:14 turnip kernel:  ? kthread_park+0xa0/0xa0
Jun 20 08:28:14 turnip kernel:  ret_from_fork+0x35/0x40
Jun 20 08:28:14 turnip kernel: task:bash            state:D stack:    0
pid:29394 ppid: 20360 flags:0x00000000
Jun 20 08:28:14 turnip kernel: Call Trace:
Jun 20 08:28:14 turnip kernel:  __schedule+0x2ff/0x760
Jun 20 08:28:14 turnip kernel:  ? submit_bio+0x4b/0x1a0
Jun 20 08:28:14 turnip kernel:  schedule+0x2f/0xa0
Jun 20 08:28:14 turnip kernel:  io_schedule+0x12/0x40
Jun 20 08:28:14 turnip kernel:  wait_on_page_bit+0x13b/0x210
Jun 20 08:28:14 turnip kernel:  ? file_fdatawait_range+0x20/0x20
Jun 20 08:28:14 turnip kernel:  read_extent_buffer_pages+0x2d4/0x3a0 [btrfs]
Jun 20 08:28:14 turnip kernel:  btree_read_extent_buffer_pages+0x9b/0x110
[btrfs]
Jun 20 08:28:14 turnip kernel:  read_tree_block+0x39/0x60 [btrfs]
Jun 20 08:28:14 turnip kernel:  read_block_for_search.isra.38+0x1b5/0x350
[btrfs]
Jun 20 08:28:14 turnip kernel:  btrfs_search_slot+0x1fe/0xa40 [btrfs]
Jun 20 08:28:14 turnip kernel:  ? inode_sb_list_add+0x19/0x60
Jun 20 08:28:14 turnip kernel:  btrfs_lookup_inode+0x3a/0xc0 [btrfs]
Jun 20 08:28:14 turnip kernel:  btrfs_iget_path+0x27a/0x730 [btrfs]
Jun 20 08:28:14 turnip kernel:  btrfs_lookup_dentry+0x1f6/0x5a0 [btrfs]
Jun 20 08:28:14 turnip kernel:  btrfs_lookup+0xe/0x30 [btrfs]
Jun 20 08:28:14 turnip kernel:  __lookup_slow+0x97/0x150
Jun 20 08:28:14 turnip kernel:  lookup_slow+0x35/0x50
Jun 20 08:28:14 turnip kernel:  walk_component+0x1c4/0x300
Jun 20 08:28:14 turnip kernel:  ? link_path_walk.part.33+0x68/0x510
Jun 20 08:28:14 turnip kernel:  ? path_init+0x192/0x320
Jun 20 08:28:14 turnip kernel:  path_lookupat+0x6e/0x210
Jun 20 08:28:14 turnip kernel:  ? reuse_swap_page+0x106/0x330
Jun 20 08:28:14 turnip kernel:  filename_lookup+0xb6/0x190
Jun 20 08:28:14 turnip kernel:  ? __nd_alloc_stack+0xd0/0xd0
Jun 20 08:28:14 turnip kernel:  ? __kmalloc+0x1a9/0x2b0
Jun 20 08:28:14 turnip kernel:  ? security_prepare_creds+0x8a/0xa0
Jun 20 08:28:14 turnip kernel:  ? do_faccessat+0xac/0x240
Jun 20 08:28:14 turnip kernel:  do_faccessat+0xac/0x240
Jun 20 08:28:14 turnip kernel:  do_syscall_64+0x5b/0x1e0
Jun 20 08:28:14 turnip kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Jun 20 08:28:14 turnip kernel: RIP: 0033:0x7faed47cadcf
Jun 20 08:28:14 turnip kernel: Code: Bad RIP value.
Jun 20 08:28:14 turnip kernel: RSP: 002b:00007ffe74cfc800 EFLAGS: 00000246
ORIG_RAX: 000000000000010d
Jun 20 08:28:14 turnip kernel: RAX: ffffffffffffffda RBX: 000055f406dcf940 RCX:
00007faed47cadcf
Jun 20 08:28:14 turnip kernel: RDX: 0000000000000004 RSI: 000055f406dcf940 RDI:
00000000ffffff9c
Jun 20 08:28:14 turnip kernel: RBP: 0000000000000200 R08: 0000000000000072 R09:
000000000000002b
Jun 20 08:28:14 turnip kernel: R10: 000bfb93fc0019a1 R11: 0000000000000246 R12:
0000000000000004
Jun 20 08:28:14 turnip kernel: R13: 0000000000000000 R14: 000055f404f16840 R15:
000055f406de9560

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