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Date: Wed, 9 Mar 2011 00:15:59 +0000 (UTC)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] Commented: (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:comment-tabpanel&focusedCommentId=13004300#comment-13004300 ] 

Allen Wittenauer commented on HADOOP-7156:
------------------------------------------

>How many of the "currently relevant" wiki pages have been updated in 
> that year-plus? 

Considering how little has changed since Apache 0.20.0 was released almost two years, not many because there was no need.

This JIRA is a great example of something that will likely be long fixed before an actual Apache release with the fix sees the light of day.  Which is why I'm mostly opposed to it going in, but not enough to -1 it.  I think we'll look like fools when a year down the road we have a reference to a bug that was long fixed, but whatever.

> Many of us live in the repo, employmentally speaking. 

In other words, "Who gives a damn about the people who are not running some form of trunk and are not watching JIRAs religiously."  

> 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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