Bug 1376926

Summary:	backport upstream 4.6+ stable@ DM fixes to arm kernel
Product:	Red Hat Enterprise Linux 7	Reporter:	Mike Snitzer <msnitzer>
Component:	kernel-aarch64	Assignee:	Mike Snitzer <msnitzer>
kernel-aarch64 sub component:	Device Mapper	QA Contact:	Bruno Goncalves <bgoncalv>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	unspecified
Priority:	unspecified	CC:	agk, bdonahue, bgoncalv, jcm, lmiksik, mlangsdo, msnitzer
Version:	7.3
Target Milestone:	rc
Target Release:	7.3
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	kernel-aarch64-4.5.0-13.el7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1378202 (view as bug list)		Environment:
Last Closed:	2016-11-03 22:53:02 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1372039

Description Mike Snitzer 2016-09-16 20:30:56 UTC

Description of problem:

The RHELSA7.3 kernel is missing these important fixes that have gone upstream since Linux 4.5 was released:

6acfe68 dm: fix excessive dm-mq context switching
4df2bf4 dm snapshot: disallow the COW and origin devices from being identical
2eae9e4 dm thin metadata: don't issue prefetches if a transaction abort has failed
d14fcf3 dm cache: make sure every metadata function checks fail_io
98dbc9c dm: fix rq_end_stats() NULL pointer in dm_requeue_original_request()
9567366 dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros
6545b60 dm cache metadata: fix cmd_read_lock() acquiring write lock
602d165 dm verity fec: fix block calculation
bd9f55e dm: fix second blk_delay_queue() parameter to be in msec units not jiffies
99f3c90 dm flakey: error READ bios during the down_interval
7d9595d dm rq: fix the starting and stopping of blk-mq queues
eaf9a73 dm: set DMF_SUSPENDED* _before_ clearing DMF_NOFLUSH_SUSPENDING
299f623 dm flakey: fix reads to be issued if drop_writes configured

It should be noted that this small set of stable.org patch is a subset of the much larger 150+ DM patches that RHELSA7.3 doesn't have.

Comment 1 Mike Snitzer 2016-09-16 20:33:35 UTC

*** Bug 1376761 has been marked as a duplicate of this bug. ***

Comment 3 Mike Snitzer 2016-09-16 21:59:44 UTC

This work is snow-balling... there is code in the 4.5 kernel that I am _not_ willing to support (specifically we need upstream commit c5248f79f39 ("dm: remove support for stacking dm-mq on .request_fn device(s)")).  Getting that commit to apply will require more extensive backport work.

Comment 7 Bruno Goncalves 2016-09-27 11:45:48 UTC

It passed on our regression test on RHEL-7.3 Snap#5 (kernel-4.5.0-13.el7.aarch64) and BZ#1376761 is also not reproducible with this kernel.

Comment 9 errata-xmlrpc 2016-11-03 22:53:02 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2145.html