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Date: Sat, 5 Mar 2011 01:44:45 +0000 (UTC)
From: "Todd Lipcon (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=13002903#comment-13002903 ] 

Todd Lipcon commented on HADOOP-7156:
-------------------------------------

Apparently no one out there who implements pam modules knows that getpwuid_r is supposed to be reentrant :) A user saw this same issue with VAS:

/lib64/libc.so.6[0x3757c7230f]
/lib64/libc.so.6(cfree+0x4b)[0x3757c7276b]
/opt/quest/lib64/libvas.so.4(vassym_sqlite3FreeX+0xe)[0x2aaaab2bd15e]
/opt/quest/lib64/libvas.so.4[0x2aaaab2ac9b9]
/opt/quest/lib64/libvas.so.4(vassym_sqlite3OsClose+0x93)[0x2aaaab2ad6d3]
/opt/quest/lib64/libvas.so.4(vassym_sqlite3pager_close+0x4d)[0x2aaaab2af1cd]
/opt/quest/lib64/libvas.so.4(vassym_sqlite3BtreeClose+0x15)[0x2aaaab29a235]
/opt/quest/lib64/libvas.so.4(vassym_sqlite3_close+0x15b)[0x2aaaab2ab62b]
/opt/quest/lib64/libvas.so.4(vassql_deinit+0xdf)[0x2aaaab3158de]
/opt/quest/lib64/libvas.so.4[0x2aaaab2f3ef9]
/opt/quest/lib64/libvas.so.4(vascache_deinit+0x30)[0x2aaaab2f438f]
/lib64/libnss_vas3.so.2[0x2aaaab027240]
/lib64/libnss_vas3.so.2(_nss_vas3_getXXent_release_tsd+0x10e)[0x2aaaab0284ff]
/lib64/libnss_vas3.so.2[0x2aaaab02c3c0]
/lib64/libnss_vas3.so.2(_nss_vas3_getpwuid_r+0x36)[0x2aaaab02d242]
/lib64/libc.so.6(getpwuid_r+0xa5)[0x3757c99515]


> 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
>
>
> 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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