Bug 644037
| Summary: | kernel BUG at mm/huge_memory.c:1267! - mapcount 5 page_mapcount 4 [rhel-6.0.z] | ||
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| Product: | Red Hat Enterprise Linux 6 | Reporter: | Benjamin Kahn <bkahn> |
| Component: | kernel | Assignee: | Frantisek Hrbata <fhrbata> |
| Status: | CLOSED ERRATA | QA Contact: | Chao Ye <cye> |
| Severity: | urgent | Docs Contact: | |
| Priority: | urgent | ||
| Version: | 6.0 | CC: | aarcange, arozansk, borgan, cye, dhoward, jwest, pm-eus, qcai, qgao, syeghiay |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-2.6.32-71.5.1.el6 | Doc Type: | Bug Fix |
| Doc Text: |
The fork() system call led to an rmap walk finding the parent huge-pmd twice instead of once, thus causing a discrepancy between the mapcount and page_mapcount check, which could have led to erratic page counts for subpages. This fix ensures that that the rmap walk is accurate when a process is forked, thus resolving the issue.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2010-11-10 19:11:36 UTC | Type: | --- |
| 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: | 642570 | ||
| Bug Blocks: | |||
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Description
Benjamin Kahn
2010-10-18 19:11:41 UTC
in 2.6.32-71.5.1.el6 Confirm patch is included in 2.6.32-71.5.1.el6.x86_64 An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2010-0842.html
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New Contents:
The fork() system call led to an rmap walk finding the parent huge-pmd twice instead of once, thus causing a discrepancy between the mapcount and page_mapcount check, which could have led to erratic page counts for subpages. This fix ensures that that the rmap walk is accurate when a process is forked, thus resolving the issue.
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