Public bug reported: 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 ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1454158 Title: When SCSI bus hangs SES driver indefinitely block any process accessing LED status for devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1454158/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
