Bug 1180942 – qemu core dumped when unhotplug gpu card assigned to guest

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Bug 1180942 - qemu core dumped when unhotplug gpu card assigned to guest

Summary:	qemu core dumped when unhotplug gpu card assigned to guest

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	qemu-kvm (Show other bugs)
Sub Component:
Version:	7.1
Hardware:	x86_64 Linux

Priority	high Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Alex Williamson
QA Contact:	Virtualization Bugs
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:	1170871
Blocks:
	Show dependency tree / graph

Reported:	2015-01-11 20:18 EST by Alex Williamson
Modified:	2015-03-05 03:14 EST (History)
CC List:	9 users (show)

See Also:
Fixed In Version:	qemu-kvm-1.5.3-86.el7
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:	1170871
Environment:
Last Closed:	2015-03-05 03:14:18 EST
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2015:0349	normal	SHIPPED_LIVE	Important: qemu-kvm security, bug fix, and enhancement update	2015-03-05 07:27:34 EST

Groups: None (edit)

Comment 2 Alex Williamson 2015-01-12 00:00:56 EST

This is a potential QEMU segfault, so I've cloned to qemu-kvm for RHEL.

Fixed by qemu.git b3e27c3aee8f5a96debfe0346e9c0e3a641a8516

A fairly effective test for this is to install the debuginfo package and run gdb on qemu before removing the device.  Set a breakpoint on vfio_intx_interrupt.  After removing the device with device_del or libvirt tools, vfio_intx_interrupt should not be called.  In the failing case, it continues to be called with the opaque data for the deleted device.  Since the error is continued use of an fd with freed data, reliable test cases can be temporary.

Comment 5 Miroslav Rezanina 2015-01-25 12:27:47 EST

Fix included in qemu-kvm-1.5.3-86.el7

Comment 7 FuXiangChun 2015-01-27 04:59:14 EST

QE tested bug with the latest qemu-kvm-1.5.3-86.el7.x86_64. The following are test scenarios and result.

S1. Assigned one GPU device(k1 or k2) to guest. then unhotplug it.

For windows(win7 64big) guest. qemu and guest work well

For RHEL7.1 guest. qemu and guest work well(guest kernel 3.10.0-226.el7.x86_64)

S2. Assigned two GPU devices(k1 and k2) to guest. then unhotplug one of them and restart guest.  

result:guest kernel panic. I filed a new bug 1186194 to track it.

Comment 8 FuXiangChun 2015-01-27 05:02:31 EST

(In reply to FuXiangChun from comment #7)
> QE tested bug with the latest qemu-kvm-1.5.3-86.el7.x86_64. The following
> are test scenarios and result.
> 
> S1. Assigned one GPU device(k1 or k2) to guest. then unhotplug it.
> 
> For windows(win7 64big) guest. qemu and guest work well
> 
> For RHEL7.1 guest. qemu and guest work well(guest kernel
> 3.10.0-226.el7.x86_64)
> 
> S2. Assigned two GPU devices(k1 and k2) to guest. then unhotplug one of them
> and restart guest.  
> 
> result:guest kernel panic. I filed a new bug 1186194 to track it.

Additional info, I tested win7 guest as well, window guest does not hit this issue.

Comment 11 errata-xmlrpc 2015-03-05 03:14:18 EST

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

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