Bug 1435545 - llvm produces illegal instructions for SKL i7 6600U with pocl
Summary: llvm produces illegal instructions for SKL i7 6600U with pocl
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: llvm
Version: 25
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Tom Stellard
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-03-24 07:48 UTC by Abrahm Scully
Modified: 2017-08-31 20:51 UTC (History)
10 users (show)

Fixed In Version: llvm-3.9.1-5.fc25
Clone Of:
Environment:
Last Closed: 2017-08-31 20:51:03 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)
clpeak under gdb with disassembly (5.39 KB, text/plain)
2017-03-24 07:48 UTC, Abrahm Scully 		no flags Details
fix illegal instruction generation on SKL (1.79 KB, patch)
2017-03-24 07:52 UTC, Abrahm Scully 		no flags Details | Diff
identify kabylake cpus (1.05 KB, patch)
2017-03-24 07:57 UTC, Abrahm Scully 		no flags Details | Diff
clpeak output after patches (846 bytes, text/plain)
2017-03-24 08:01 UTC, Abrahm Scully 		no flags Details
View All

Description Abrahm Scully 2017-03-24 07:48:38 UTC 
Created attachment 1265982 [details]
clpeak under gdb with disassembly

Description of problem:

Running clpeak with pocl and llvm 3.9 crashes with illegal instruction on an intel i7-6600U.

Version-Release number of selected component (if applicable):
llvm 3.9.1-2

How reproducible:
100%

Steps to Reproduce:
1. Install pocl.
2. Install clpeak.
3. Run clpeak.

Actual results:
clpeak crashes on illegal instruction.

Expected results:
clpeak completes without crashing.

Additional info:
Comment 1 Abrahm Scully 2017-03-24 07:52:54 UTC 
Created attachment 1265983 [details]
fix illegal instruction generation on SKL

This issue was fixed with llvm svn commit r291084.
Comment 2 Abrahm Scully 2017-03-24 07:57:44 UTC 
Created attachment 1265984 [details]
identify kabylake cpus

I happen to have a skylake XPS 13 9350 and a kabylake 9360 for debugging... Only the skylake crashed with the illegal instruction, which is why I starting debugging this since they laptops are so similar.

llvm changeset r291086 adds the CPU ids for my 9360.
Comment 3 Abrahm Scully 2017-03-24 08:01:05 UTC 
Created attachment 1265985 [details]
clpeak output after patches

Added the two patches to the llvm spec file and rebuild with mock. After installing the patched llvm-libs-3.9.1, clpeak runs fine on both laptops.
Comment 4 Milan Bouchet-Valat 2017-03-24 13:41:41 UTC 
The report is about the main (unversioned) llvm package, though we may want to apply the patches to llvm3.9 too.
Comment 5 Fedora Admin XMLRPC Client 2017-05-04 13:57:37 UTC 
This package has changed ownership in the Fedora Package Database.  Reassigning to the new owner of this component.
Comment 6 Fedora Update System 2017-08-25 21:40:41 UTC 
llvm-3.9.1-5.fc25 has been submitted as an update to Fedora 25. https://bodhi.fedoraproject.org/updates/FEDORA-2017-3ff7bcde09
Comment 7 Fedora Update System 2017-08-26 22:37:55 UTC 
llvm-3.9.1-5.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-3ff7bcde09
Comment 8 Fedora Update System 2017-08-31 20:51:03 UTC 
llvm-3.9.1-5.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.
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