On Mon, 2018-07-30 at 11:40 -0700, Bart Van Assche wrote:

A long time ago the unfortunate decision was taken to add a self-
deletion attribute to the sysfs SCSI device directory. That decision
was unfortunate because self-deletion is really tricky. We can't drop
that attribute because widely used user space software depends on it,
namely the rescan-scsi-bus.sh script. Hence this patch that avoids
that writing into that attribute triggers a deadlock. See also commit
7973cbd9fbd9 ("[PATCH] add sysfs attributes to scan and delete
scsi_devices").

[ ... ]

During my kernel tests of today I noticed that this patch makes booting
significantly slower: boot time for a VM increases from 6s to 157s. Martin,
please drop this patch series.

Thanks,

Bart.