在 2018/2/26 23:25, Bart Van Assche 写道:
On Mon, 2018-02-26 at 17:37 +0800, chenxiang (M) wrote:When i have a test on kernel 4.16-rc1, find a issue: running IO on SATA disk, then disable the disk through sysfs interface(echo 0 > /sys/class/sas_phy/phy-1:0:0/enable), IO will hang and never enter SCSI EH. The issue appears every time. I add some prints on code and find that those IOs will be timeout after 30s, and they all enter function scsi_eh_scmd_add, but only some of them can enter function scsi_eh_inc_host_failed. So it will never enter SCSI EH. I suspect it is related to the patch ("commit 3bd6f43f5cb371" scsi: core: Ensure that the SCSI error handler gets woken up ). Please have a check.Hello chenxiang, Had you already noticed patch "[PATCH v2] Avoid that ATA error handling can trigger a kernel hang or oops"? If not, can you apply that patch to your kernel and verify whether it fixes this behavior? See also https://www.mail-archive.com/linux-scsi@xxxxxxxxxxxxxxx/msg71189.html or https://patchwork.kernel.org/patch/10236213/.
Ok， i will verify the patch.
Thanks, Bart.
