** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Assignee: Taco Screen team (taco-screen-team) => Canonical Kernel Team
(canonical-kernel-team)
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https://bugs.launchpad.net/bugs/1682644
Title:
IPR driver causes multipath to fail paths/stuck IO on Medium Errors
Status in linux package in Ubuntu:
Triaged
Bug description:
---Problem Description---
IPR driver causes multipath to fail paths/stuck IO on Medium Errors
This problem is resolved with this upstream accepted patch, scheduled for
4.11.
The detailed problem description and resolution are described in the commit
message.
> scsi: ipr: do not set DID_PASSTHROUGH on CHECK CONDITION
>
http://git.kernel.org/?p=linux/kernel/git/jejb/scsi.git;a=commit;h=785a470496d8e0a32e3d39f376984eb2c98ca5b3
Please apply to 17.04 and 16.04.
The business justification for the SRU is:
Clients with a dual-controller multipathed IPR configuration that
eventually runs into failing disk/sectors, will experience an I/O hang
once the drive reports a Medium Error, which can hang an application
or even the root filesystem (whatever is doing I/O to the failing
drive), potentially hanging the system.
Thanks.
---Additional Hardware Info---
Dual (IPR) controller setup, multipath enabled
---Steps to Reproduce---
1) Use a disk with bad sectors (or force such condition, via internal/special
tools)
2) Multipath that disk
3) Run IO to the multipath device on the bad sectors
4) Both paths will be failed, and IO is stuck due to queue_if_no_path
(enabled by default for IPR)
The detailed problem description and resolution are described in the
commit message.
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