Bug 1815399

Summary:	"fd" type error cause qemu-kvm process core dump when hotplugging tap device
Product:	Red Hat Enterprise Linux Advanced Virtualization	Reporter:	FuXiangChun <xfu>
Component:	qemu-kvm	Assignee:	Yvugenfi <yvugenfi>
qemu-kvm sub component:	Networking	QA Contact:	Lei Yang <leiyang>
Status:	CLOSED NOTABUG	Docs Contact:
Severity:	urgent
Priority:	urgent	CC:	aadam, chayang, jinzhao, juzhang, leiyang, qzhang, virt-maint, ybendito, yvugenfi
Version:	8.2	Keywords:	Regression
Target Milestone:	rc	Flags:	xfu: needinfo- pm-rhel: mirror+
Target Release:	8.0
Hardware:	x86_64
OS:	Windows
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-12-21 02:04:56 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 FuXiangChun 2020-03-20 07:15:51 UTC

Description of problem:

Like Julia's comments(https://bugzilla.redhat.com/show_bug.cgi?id=1716352#c30), 'fd' type error caused this issue. 

qemu-kvm process core dump directly when hotplugging tap deivce via qmp or hmp

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

qemu-kvm: qemu-kvm-core-4.2.0-15.module+el8.2.0+6029+618ef2ec.x86_64
kernel: kernel-4.18.0-187.el8.x86_64

How reproducible:
always

Steps to Reproduce:
1. Boot qemu-kvm process 
/usr/libexec/qemu-kvm -qmp tcp:0:4444,server,nowait

2. qmp connect
# telnet localhost 4444

3. hotplug tap device
{"execute": "netdev_add", "arguments": {"type": "tap", "id": "idR6cfzQ", "fd": "50"}, "id": "yqUkNhhe"}


Actual results:

qemu-kvm: util/oslib-posix.c:247: qemu_set_nonblock: Assertion `f != -1' failed.
Aborted (core dumped)

Expected results:
works

Additional info:

Comment 12 Lei Yang 2020-12-21 02:04:56 UTC

Base on comment 11, move it to "NOTABUG"