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From "Greg Roelofs (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7156) getpwuid_r is not thread-safe on RHEL6
Date Tue, 08 Mar 2011 03:26:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003796#comment-13003796
] 

Greg Roelofs commented on HADOOP-7156:
--------------------------------------

bq. I did not add it to core-default since it's a corner case... does that seem reasonable
or should it be documented?

Please please please...always document things like this. Picture it from the perspective of
some new user who hasn't discovered the lists yet (or hasn't been subscribed for very long,
and then only on the -user list(s)): they know they're running RHEL-6 and probably will notice
a config item that explicitly mentions it (which I'd recommend, along with CentOS and any
other known distro versions), but they're much less likely to know what's up with a random
glibc crash several months later.

> 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
>
>
> 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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