Bug 1101811

Summary:	ruby stops due to illegal instruction on Athlon MP (i686) but not x86_64
Product:	[Fedora] Fedora	Reporter:	Bruno Wolff III <bruno>
Component:	ruby	Assignee:	Jeroen van Meeuwen <vanmeeuwen+fedora>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	rawhide	CC:	bkabrda, bruno, caillon+fedoraproject, debarshir, fedora, jstribny, lmacken, mmorsi, mtasaka, orion, s, tagoh, vanmeeuwen+fedora, vondruch
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Unspecified
Whiteboard:
Fixed In Version:	ruby-2.1.5-26.fc21	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-01-06 06:04:07 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 Bruno Wolff III 2014-05-28 02:25:00 UTC

Description of problem:
Missing separate debuginfos, use: debuginfo-install xchat-2.8.8-21.fc20.i686
(gdb) run
Starting program: /usr/bin/xchat 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
gobject.pyc: gdb was not built with custom backtrace support, disabling.
[New Thread 0xa4d27b40 (LWP 4051)]

Program received signal SIGILL, Illegal instruction.
0xa38ecb86 in gc_before_sweep () from /lib/libruby.so.2.1


Version-Release number of selected component (if applicable):
xchat-2.8.8-21.fc20

How reproducible:
Happens consistantly on an athlon MP and doesn'y happen on an x86_64 xeon. Both machines are running rawhide.

Steps to Reproduce:
1.Run xchat
2.Attempt to connect to freenode
3.

Actual results:
xchat stops due to an illegal instruction

Comment 1 Bruno Wolff III 2014-05-29 04:12:07 UTC

I am still seeing this with xchat-2.8.8-22.fc21.i686.

Comment 2 Bruno Wolff III 2014-05-29 12:36:58 UTC

The instruction appears to be an sse2 instruction, which shouldn't be used without making sure the cpu supports it.

Since this is in a ruby library, I am going to switch the bug to there.

Comment 3 Bruno Wolff III 2014-05-29 12:40:05 UTC

It looks like ruby checks to see if the build host can use sse2 during configure. It shouldn't be using sse2 unless there are run time checks to make sure the sse2 path is only used on cpus that support it.

Comment 4 Vít Ondruch 2014-08-09 09:03:32 UTC

This is the original reason for addition the flag:

https://bugs.ruby-lang.org/issues/8358

and the backport ticket:

https://bugs.ruby-lang.org/issues/9495

Comment 5 Vít Ondruch 2014-08-09 10:03:11 UTC

I reported the issue upstream: https://bugs.ruby-lang.org/issues/10120

May be we should revert the specific backport commits ...

Comment 6 Kevin Kofler 2014-11-23 08:16:10 UTC

Yes, this Ruby change MUST be reverted in Fedora. Why is that still not done 2 months later? -mfpmath=sse is NOT allowed in Fedora i686 (except if you're building a separate version of the library in /usr/lib/sse2, but then you need to weigh the performance and rounding pedanticness vs. the doubled space requirement).

Comment 7 Kevin Kofler 2014-11-23 08:17:23 UTC

Actually, 3½ months later, even.

Comment 8 Orion Poplawski 2014-12-21 22:18:59 UTC

This is breaking puppet on i686 as well.  Perhaps all ruby code?

Comment 9 Fedora Update System 2014-12-28 04:33:06 UTC

ruby-2.1.5-26.fc21 has been submitted as an update for Fedora 21.
https://admin.fedoraproject.org/updates/ruby-2.1.5-26.fc21

Comment 10 Fedora Update System 2014-12-29 10:03:31 UTC

Package ruby-2.1.5-26.fc21:
* should fix your issue,
* was pushed to the Fedora 21 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing ruby-2.1.5-26.fc21'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2014-17682/ruby-2.1.5-26.fc21
then log in and leave karma (feedback).

Comment 11 Bruno Wolff III 2014-12-29 17:14:20 UTC

I tested xchat now that I have ruby-2.1.5-26.fc22 in rawhide and things seem to be working OK. Thanks.

Comment 12 Fedora Update System 2015-01-06 06:04:07 UTC

ruby-2.1.5-26.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.