Public bug reported:
I'm using OpenStack on Ubuntu 14.04 with the 4.4.0-47 kernel. Volumes
are being attached over Fibre Channel (qla2xxx adapter) with multipath.
About once a month, a compute node fails to detach a volume. After that,
the scsi device is left in a semi-deleted state:
Normal device:
root@cmp02:/sys/dev/block/65:96/device# ls /sys/dev/block/65:80/device
block generic scsi_device
bsg inquiry scsi_disk
delete iocounterbits scsi_generic
device_blocked iodone_cnt scsi_level
device_busy ioerr_cnt state
dh_state iorequest_cnt subsystem
driver modalias timeout
eh_timeout model type
evt_capacity_change_reported power uevent
evt_inquiry_change_reported queue_depth vendor
evt_lun_change_reported queue_ramp_up_period vpd_pg80
evt_media_change queue_type vpd_pg83
evt_mode_parameter_change_reported rescan
evt_soft_threshold_reached rev
Half-deleted device:
root@cmp02:/sys/dev/block/65:96/device# ls /sys/dev/block/65:96/device
block scsi_disk
There is nothing interesting in /var/log/messages or /var/log/kern.log.
multipath -l gives empty output, which pretty much blocks all operation
of OpenStack on that node and forces me to reboot it.
Tried issuing rescan on the FC adapters without success. The scsi device
seems to be detached from the adapter.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1680774
Title:
scsi device that can't be deleted
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