Bug 1435545
| Summary: | llvm produces illegal instructions for SKL i7 6600U with pocl | ||||||||||||
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| Product: | [Fedora] Fedora | Reporter: | Abrahm Scully <abrahm.scully> | ||||||||||
| Component: | llvm | Assignee: | Tom Stellard <tstellar> | ||||||||||
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||||||
| Severity: | unspecified | Docs Contact: | |||||||||||
| Priority: | unspecified | ||||||||||||
| Version: | 25 | CC: | ajax, bos, davejohansen, dmalcolm, jistone, nalimilan, orion, petersen, scottt.tw, tstellar | ||||||||||
| Target Milestone: | --- | ||||||||||||
| Target Release: | --- | ||||||||||||
| Hardware: | Unspecified | ||||||||||||
| OS: | Unspecified | ||||||||||||
| Whiteboard: | |||||||||||||
| Fixed In Version: | llvm-3.9.1-5.fc25 | Doc Type: | If docs needed, set a value | ||||||||||
| Doc Text: | Story Points: | --- | |||||||||||
| Clone Of: | Environment: | ||||||||||||
| Last Closed: | 2017-08-31 20:51:03 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: | |||||||||||||
| Attachments: |
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Created attachment 1265983 [details]
fix illegal instruction generation on SKL
This issue was fixed with llvm svn commit r291084.
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.
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.
The report is about the main (unversioned) llvm package, though we may want to apply the patches to llvm3.9 too. This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component. llvm-3.9.1-5.fc25 has been submitted as an update to Fedora 25. https://bodhi.fedoraproject.org/updates/FEDORA-2017-3ff7bcde09 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 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. |
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: