Please cherry pick upstream commit c96f5471ce7d ("delayacct: Account blkio completion on the correct task") into the Ubuntu 4.13 kernel. It has also been accepted into the Linux stable branch as 4.14.15.
Please cherry pick upstream commit c96f5471ce7d ("delayacct: Account blkio completion on the correct task") into the Ubuntu 4.13 kernel. It has also been accepted into the Linux stable branch as 4.14.15.