=== PID 887 (ext4lazyinit) ===
[<0>] __lock_buffer+0x33/0x50
[<0>] ext4_read_block_bitmap_nowait+0x2f8/0x420
[<0>] ext4_mb_init_cache+0xca/0x620
[<0>] ext4_mb_init_group+0x143/0x250
[<0>] ext4_mb_prefetch_fini+0x82/0xb0
[<0>] ext4_run_li_request+0x12c/0x260
[<0>] ext4_lazyinit_thread.part.0+0x1cb/0x390
[<0>] ext4_lazyinit_thread+0x1f/0x30
[<0>] kthread+0xef/0x120
[<0>] ret_from_fork+0x44/0x70
[<0>] ret_from_fork_asm+0x1b/0x30