This bug is missing log files that will aid in diagnosing the problem.
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1454158
Title:
When SCSI bus hangs SES driver indefinitely block any process
accessing LED status for devices
Status in linux package in Ubuntu:
Incomplete
Bug description:
Ubuntu 14.04, 3.13.0-40-generic
Configuration:
SCSI (mpt2sas, 16.100.00.00) with few enclosures with SATA disks.
Situation:
One of enclosures is hung and do not reply to any requests (including reset).
All sg_* command to any device behind hanged enclosure, including enclosure
itself, are stuck in the 'D' state.
Problem:
Access to sysfs place processes in 'D' state:
cat /sys/class/enclosure/5\:0\:46\:0/Slot\ 01/locate
root 588 0.0 0.0 7152 612 pts/6 D+ 08:40 0:00 cat
/sys/class/enclosure/5:0:46:0/Slot 01/locate
Proposed solution: Add timeout to ses devices independent of HBA
driver.
Rationale: Accessing to sysfs do not expect to be 'real IO' with
chances to hung in 'D' forever.
Kernel bugzilla bug: https://bugzilla.kernel.org/show_bug.cgi?id=98121
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