Bug 642679

Summary: kernel BUG at mm/huge_memory.c:1279! [rhel-6.0.z]
Product: Red Hat Enterprise Linux 6 Reporter: RHEL Program Management <pm-rhel>
Component: kernelAssignee: Frantisek Hrbata <fhrbata>
Status: CLOSED ERRATA QA Contact: Zhouping Liu <zliu>
Severity: urgent Docs Contact:
Priority: urgent    
Version: 6.0CC: aarcange, alex.williamson, arozansk, dhoward, khong, lwoodman, michael.hagmann, nobody+295318, pm-eus, qcai, riel, syeghiay, tburke, zliu
Target Milestone: rcKeywords: Reopened, 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:
Previously, an operation such as madvise(MADV_MERGEABLE) may have split VMAs (Virtual Memory Area) without checking if any huge page had to be split into regular pages, leading to huge pages to be still mapped in VMA ranges that would not be large enough to fit huge pages. With this update, huge pages are checked whether they have been split when any VMA is being truncated.
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-11-10 19:11:30 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 622327    
Bug Blocks:    

Description RHEL Program Management 2010-10-13 14:50:00 UTC
This bug has been copied from bug #622327 and has been proposed
to be backported to 6.0 z-stream (EUS).

Comment 2 Frantisek Hrbata 2010-10-20 06:22:39 UTC
in 2.6.32-71.5.1.el6

Comment 7 errata-xmlrpc 2010-11-10 19:11:30 UTC
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

Comment 8 Martin Prpič 2010-11-11 12:04:46 UTC
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Previously, an operation such as madvise(MADV_MERGEABLE) may have split VMAs (Virtual Memory Area) without checking if any huge page had to be split into regular pages, leading to huge pages to be still mapped in VMA ranges that would not be large enough to fit huge pages. With this update, huge pages are checked whether they have been split when any VMA is being truncated.

Comment 9 Suzanne Forsberg 2011-04-20 18:21:08 UTC
*** Bug 683776 has been marked as a duplicate of this bug. ***