dmesg
1 [<ffffffff9c553413>] get_request+0x243/0x7d0 2 [<ffffffff9c55614e>] blk_queue_bio+0xfe/0x400 3 [<ffffffff9c554387>] generic_make_request+0x147/0x380 4 [<ffffffff9c554630>] submit_bio+0x70/0x150 5 [<ffffffffc0599f85>] xfs_add_to_ioend+0x145/0x1d0 [xfs] 6 [<ffffffffc059a5b5>] xfs_do_writepage+0x1e5/0x550 [xfs] 7 [<ffffffff9c3ca15c>] write_cache_pages+0x21c/0x470 8 [<ffffffffc059a39b>] xfs_vm_writepages+0x6b/0xa0 [xfs] 9 [<ffffffff9c3cb1b1>] do_writepages+0x21/0x50 10 [<ffffffff9c47cbd0>] __writeback_single_inode+0x40/0x260 11 [<ffffffff9c47d764>] writeback_sb_inodes+0x1c4/0x430 12 [<ffffffff9c47da6f>] __writeback_inodes_wb+0x9f/0xd0 13 [<ffffffff9c47df53>] wb_writeback+0x263/0x2f0 14 [<ffffffff9c47eb4b>] bdi_writeback_workfn+0x2cb/0x460 15 [<ffffffff9c2be6bf>] process_one_work+0x17f/0x440 16 [<ffffffff9c2bf7d6>] worker_thread+0x126/0x3c0 17 [<ffffffff9c2c6691>] kthread+0xd1/0xe0 18 [<ffffffff9c992d37>] ret_from_fork_nospec_end+0x0/0x39 19 [<ffffffffffffffff>] 0xffffffffffffffff