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Bug 843199

Summary:	Ruby bindings segfault in event callbacks when the Ruby GC is invoked.
Product:	Red Hat Enterprise Linux 6	Reporter:	Richard W.M. Jones <rjones>
Component:	libguestfs	Assignee:	Richard W.M. Jones <rjones>
Status:	CLOSED CANTFIX	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.4	CC:	dyasny, leiwang, mbooth, moli, qguan
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	843188	Environment:
Last Closed:	2012-09-28 13:03:20 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:	843188
Bug Blocks:

Description Richard W.M. Jones 2012-07-25 21:35:34 UTC

+++ This bug was initially created as a clone of Bug #843188 +++

Description of problem:

Initial report is here, with a partial stack trace:
https://issues.jboss.org/browse/BGBUILD-371

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

libguestfs 1.16.28

How reproducible:

100%

Steps to Reproduce:
1. unknown at present

--- Additional comment from rjones on 2012-07-25 17:34:14 EDT ---

Created attachment 600404 [details]
bz843188.rb

This small script reproduces the bug.

Save it to a file, chmod +x the script and run it.  It will
cause a segfault.

If you comment out the line that calls g.set_event_callback
then it won't segfault, proving that the problem is with
events.

Comment 3 Richard W.M. Jones 2012-09-28 13:03:20 UTC

We got to the bottom of this bug (see:
https://bugzilla.redhat.com/show_bug.cgi?id=843188#c6)
and essentially the problem is that the Ruby 1.8 garbage
collector is broken by design.

This problem is unfixable, except by moving to Ruby 1.9
or not using Ruby.