Bug 1593100

Summary:	[CephFS]: mds crash if client get evicted in the middle of mds failover
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Yan, Zheng <zyan>
Component:	CephFS	Assignee:	Patrick Donnelly <pdonnell>
Status:	CLOSED ERRATA	QA Contact:	subhash <vpoliset>
Severity:	high	Docs Contact:
Priority:	low
Version:	3.0	CC:	ceph-eng-bugs, ceph-qe-bugs, john.spray, rperiyas, tchandra
Target Milestone:	z5
Target Release:	3.0
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:	RHEL: ceph-12.2.4-32 Ubuntu: ceph_12.2.4-36redhat1xenial	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-08-09 18:27:11 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:	1611056

Description Yan, Zheng 2018-06-20 03:48:24 UTC

Description of problem:

If clients get evicted in the middle of mds failover，there is a chance that ceph-mds crashes.

How reproducible:


Steps to Reproduce:
1. Setup 3 active mds, 1 ceph-fuse client, run metadata extensive workload (such as fsstss -p 16 ...)
2. Restart 2 mds. When one recovering mds enter rejoin state, kill the client by using 'ceph daemon mds.xxx session evict xxx'

Actual results:

ceph-mds may crash

Expected results:

ceph-mds does not crash

Additional info:

Comment 3 Yan, Zheng 2018-06-20 07:28:56 UTC

zhyan-laptop:ceph zhyan$ git push rh-ceph ceph-3.0-rhel-patches 
Counting objects: 62, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (57/57), done.
Writing objects: 100% (62/62), 11.35 KiB | 726.00 KiB/s, done.
Total 62 (delta 54), reused 5 (delta 5)
remote: Resolving deltas: 100% (54/54)
remote: Processing changes: refs: 1, done    
To ssh://code.engineering.redhat.com/ceph/.git
   0b3592f04c..1e9171374c  ceph-3.0-rhel-patches -> ceph-3.0-rhel-patches

Comment 13 subhash 2018-08-02 15:56:29 UTC

MDS version: ceph version 12.2.4-45redhat1xenial

followed the steps from desc,mds no longer crashes when the client is evicted.

Moving to verified state

Comment 15 errata-xmlrpc 2018-08-09 18:27:11 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://access.redhat.com/errata/RHBA-2018:2375