Hi Fengguang, > [ 646.051405] ffff880004ee1978 0000000000000000 0000000000000170 0000000000000000 > [ 646.051405] Call Trace: > [ 646.051405] [<ffffffff81099aa3>] ? sched_clock_local+0x12/0x75 > [ 646.051405] [<ffffffff810a5a16>] lock_acquire+0xdd/0x10a > [ 646.051405] [<ffffffff81175de4>] ? create_empty_buffers+0x4a/0xc1 > [ 646.051405] [<ffffffff8199f623>] _raw_spin_lock+0x36/0x69 > [ 646.051405] [<ffffffff81175de4>] ? create_empty_buffers+0x4a/0xc1 > [ 646.051405] [<ffffffff81175de4>] create_empty_buffers+0x4a/0xc1 > [ 646.051405] [<ffffffff811efd2f>] ext4_discard_partial_page_buffers_no_lock+0x9f/0x406 > [ 646.051405] [<ffffffff8199ffeb>] ? _raw_spin_unlock+0x2b/0x2f > [ 646.051405] [<ffffffff81170c26>] ? __mark_inode_dirty+0x1ac/0x1cc > [ 646.051405] [<ffffffff811767f3>] ? generic_write_end+0x6d/0x7f > [ 646.051405] [<ffffffff811f15e5>] ext4_da_write_end+0x244/0x2ed > [ 646.051405] [<ffffffff810ffeec>] generic_file_buffered_write+0x183/0x22d It seems that you are running in to several problems related to discard_page_buffers_no_lock in write_end. The problems had been fixed by following patches [ext4: avoid potential hang in mpage_submit_io() when blocksize < pagesize], [ext4: correctly handle pages w/o buffers in ext4_discard_partial_buffers()] and [ext4: handle EOF correctly in ext4_bio_write_page()]. The patches had been merged to rc6. Yongqiang. > > The test case is about running 100 dd tasks on each of the 10 JBOD disks: > > lkp-st02-x8664/JBOD-10HDD-thresh=100M/ext4-100dd-1-3.2.0-rc5-ioless-full+ > > Thanks, > Fengguang -- Best Wishes Yongqiang Yang -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
