Bug 1392135

Summary:	Possible data corruption when in-memory cache is enabled
Product:	Red Hat Ceph Storage	Reporter:	Jason Dillaman <jdillama>
Component:	RBD	Assignee:	Jason Dillaman <jdillama>
Status:	CLOSED WONTFIX	QA Contact:	ceph-qe-bugs <ceph-qe-bugs>
Severity:	urgent	Docs Contact:
Priority:	unspecified
Version:	1.3.3	CC:	ceph-eng-bugs
Target Milestone:	rc
Target Release:	1.3.4
Hardware:	Unspecified
OS:	Unspecified
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Clone Of:
Clones:	1392136 (view as bug list)		Environment:
Last Closed:	2018-03-07 23:52:26 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:
Bug Depends On:
Bug Blocks:	1392136

Description Jason Dillaman 2016-11-05 00:44:29 UTC

Description of problem:
With writeback cache enabled, there is a possibility that read requests serviced through the cache will be corrupted. 

Version-Release number of selected component (if applicable):
1.2, 1.3

How reproducible:
Reports indicate nearly 100% given enough time and high IOPS workload (i.e. a database load simulator).

Steps to Reproduce:
1. Reported to fail with Windows Server 2012R2 and SQL Server backed by RBD image with RBD writeback cache enabled.
2. Use SQLioSim to inject load into the database

Actual results:
Expected FileId: 0x0
Received FileId: 0x0
Expected PageId: 0xCB19C
Received PageId: 0xCB19A (does not match expected)
Received CheckSum: 0x9F444071
Calculated CheckSum: 0x89603EC9 (does not match expected)
Received Buffer Length: 0x2000

Expected results:
No IO errors

Additional info:

Comment 3 Jason Dillaman 2016-11-05 00:48:24 UTC

Upstream, backport PR against hammer branch: https://github.com/ceph/ceph/pull/11618