Bug 1348620 - glibc: malloc may fall back to calling mmap prematurely if arenas are contended
Summary: glibc: malloc may fall back to calling mmap prematurely if arenas are contended
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: glibc
Version: 26
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Florian Weimer
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: 1255822
TreeView+ depends on / blocked
 
Reported: 2016-06-21 15:18 UTC by Florian Weimer
Modified: 2017-10-11 12:13 UTC (History)
14 users (show)

Fixed In Version: glibc-2.22-18.fc23, glibc-2.23.1-10.fc24, glibc-2.23.90-24.fc25
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1255822
Environment:
Last Closed: 2017-10-11 12:13:45 UTC
Type: Bug

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1246713 0 medium CLOSED CVE-2015-5229 glibc: calloc() returns non-zero'ed memory 2021-02-22 00:41:40 UTC
Sourceware 20284 0 None None None 2016-06-21 15:18:31 UTC

Internal Links: 1246713

Description Florian Weimer 2016-06-21 15:18:31 UTC 
+++ This bug was initially created as a clone of Bug #1255822 +++

Description of problem:
Due to the robust malloc changes, malloc functions may end up calling mmap prematurely if all arenas are contended but not corrupt.  This is not a serious issue in the general case and its performance impact is also questionable because it is not clear if the contention is more expensive in terms of time than a system call.  It is however expensive resource-wise if the block requests are significantly smaller than page size because that will create a lot of external holes.

See also: bug 1246713 for rhel-6, where this problem is one of two problems that the bug report mentioned.
Comment 1 Jan Kurik 2016-07-26 04:09:04 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora 25 development cycle.
Changing version to '25'.
Comment 2 Fedora Update System 2016-08-18 15:16:46 UTC 
glibc-2.23.1-10.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-5f050a0a6d
Comment 3 Fedora Update System 2016-08-18 17:32:58 UTC 
glibc-2.22-18.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2016-87dde780b8
Comment 4 Fedora Update System 2016-08-19 00:21:59 UTC 
glibc-2.22-18.fc23 has been pushed to the Fedora 23 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-2016-87dde780b8
Comment 5 Fedora Update System 2016-08-19 00:58:27 UTC 
glibc-2.23.1-10.fc24 has been pushed to the Fedora 24 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-2016-5f050a0a6d
Comment 6 Fedora Update System 2016-08-19 19:52:27 UTC 
glibc-2.23.1-10.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2016-09-02 23:20:53 UTC 
glibc-2.22-18.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 8 Fedora End Of Life 2017-02-28 09:59:29 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.
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