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Date: Tue, 8 Mar 2011 19:29:01 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] Updated: (HADOOP-7156) getpwuid_r is not thread-safe on
 RHEL6
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     [ https://issues.apache.org/jira/browse/HADOOP-7156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HADOOP-7156:
--------------------------------

    Attachment: hadoop-7156.txt

Updated version includes docs in core-default.xml

Do you agree with the current test case? It will fail with JVM exit on RHEL6 currently. Should we set the workaround variable to true in the test settings?

Another option is to add a bit of code to apply some regexes to /etc/redhat-release and enable by default if running RHEL or CentOS 6.

> getpwuid_r is not thread-safe on RHEL6
> --------------------------------------
>
>                 Key: HADOOP-7156
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7156
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.22.0
>         Environment: RHEL 6.0 "Santiago"
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.22.0
>
>         Attachments: hadoop-7156.txt, hadoop-7156.txt, hadoop-7156.txt
>
>
> Due to the following bug in SSSD, functions like getpwuid_r are not thread-safe in RHEL 6.0 if sssd is specified in /etc/nsswitch.conf (as it is by default):
> https://fedorahosted.org/sssd/ticket/640
> This causes many fetch failures in the case that the native libraries are available, since the SecureIO functions call getpwuid_r as part of fstat. By enabling -Xcheck:jni I get the following trace on JVM crash:
> *** glibc detected *** /mnt/toolchain/JDK6u20-64bit/bin/java: free(): invalid pointer: 0x0000003575741d23 ***
> ======= Backtrace: =========
> /lib64/libc.so.6[0x3575675676]
> /lib64/libnss_sss.so.2(_nss_sss_getpwuid_r+0x11b)[0x7fe716cb42cb]
> /lib64/libc.so.6(getpwuid_r+0xdd)[0x35756a5dfd]

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