[<0>] submit_bio_wait+0x75/0xc0
[<0>] blkdev_issue_zeroout+0x18e/0x2c0
[<0>] ext4_init_inode_table+0x17e/0x380
[<0>] ext4_lazyinit_thread+0x35c/0x5d0
[<0>] kthread+0xcb/0x100
[<0>] ret_from_fork+0x2d/0x50
[<0>] ret_from_fork_asm+0x1a/0x30
