Bug 1107821

Summary:	rdma migration: seg if destination isn't listening
Product:	Red Hat Enterprise Linux 7	Reporter:	Dr. David Alan Gilbert <dgilbert>
Component:	qemu-kvm	Assignee:	Dr. David Alan Gilbert <dgilbert>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.1	CC:	hhuang, huding, juzhang, michen, mrezanin, qzhang, rbalakri, shu, virt-maint, xfu
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	qemu-kvm-1.5.3-69.el7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-05 08:10:12 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:

Description Dr. David Alan Gilbert 2014-06-10 17:54:43 UTC

Description of problem:
Trivially able to seg qemu by attempting to migrate to a destination that isn't listening

Version-Release number of selected component (if applicable):
qemu-kvm-rhev-2.0.0-1.el7ev.test.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Get a pair of machines connected via ib
2. Start a qemu 
3. migrate -d rdma:ibpair:4444
   where 'ibpair' is the IP address of the other host, which you can ping via it's ib interface but doesn't have a receiving QEMU running.

Actual results:
seg

Expected results:
a nice error

Additional info:
Probably https://lists.gnu.org/archive/html/qemu-devel/2014-02/msg02994.html

Comment 1 Dr. David Alan Gilbert 2014-06-12 10:02:08 UTC

Fixed by http://patchwork.ozlabs.org/patch/321271/ that never got merged upstream.

Comment 3 Miroslav Rezanina 2014-08-26 14:03:52 UTC

Fix included in qemu-kvm-1.5.3-69.el7

Comment 5 Shaolong Hu 2014-10-15 09:29:27 UTC

Verified on qemu-kvm-1.5.3-75.el7.x86_64:

if des has no qemu-kvm listening:

(qemu) migrate x-rdma:192.168.100.1:5555
source_resolve_host RDMA Device opened: kernel name mlx4_0 uverbs device name uverbs0, infiniband_verbs class device path /sys/class/infiniband_verbs/uverbs0, infiniband class device path /sys/class/infiniband/mlx4_0, transport: (2) Ethernet
rdma_get_cm_event != EVENT_ESTABLISHED after rdma_connect: Resource temporarily unavailable
RDMA ERROR: connecting to destination!
migrate: RDMA ERROR: connecting to destination!


There is proper error report, and qemu-kvm works correctly.

Comment 6 Shaolong Hu 2014-10-15 09:53:01 UTC

During test, found another issue:

Bug 1152969 - Qemu-kvm got stuck when migrate to wrong RDMA ip

symptom is different, list here for reference.

Comment 9 Shaolong Hu 2014-11-21 03:47:27 UTC

According to comment 5, this bug has been fixed, as to problem in comment 6, the bug has been fixed either.

Comment 11 errata-xmlrpc 2015-03-05 08:10:12 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/RHSA-2015-0349.html