On Fri, 2017-12-01 at 13:36 -0200, Mauricio Faria de Oliveira wrote: > On 11/29/2017 12:57 AM, chenxiang (M) wrote: > > I applied this v2 patchset to kernel 4.15-rc1, running fio on a SATA > > disk, then disable the disk with sysfs interface > > (echo 0 > /sys/class/sas_phy/phy-1:0:1/enable), and find system is hung. > > But with v1 patch, it doesn't > > has this issue. Please have a check. > > Indeed, with this particular test-case (thanks, chenxiang) the problem > can be recreated with PATCH v2 but _not_ with v1. > > For reference, I'm including the tests with v2 in this e-mail. > The same tests have too been performed with v1, without blocked tasks. > > Interestingly, physical disk pulls did not hit the problem either > on v1 or v2 (but it does not matter anymore) -- so v1 is the one. The test chenxiang ran does not prove that there is anything wrong with v2. Maybe chenxiang hit the issue described in https://lkml.org/lkml/2017/9/5/381? Bart.
