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https://issues.apache.org/jira/browse/HDFS-3757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427814#comment-13427814
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Colin Patrick McCabe commented on HDFS-3757:
--------------------------------------------
Here's an example of a stack trace _without_ the patch:
{code}
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGFPE (0x8) at pc=0x00007faf6092a078, pid=29084, tid=140389502605056
#
# JRE version: 6.0_29-b11
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.4-b02 mixed mode linux-amd64
compressed oops)
# Problematic frame:
# C [libhdfs.so.0.0.0+0x4078] unsigned char+0x58
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
{code}
Here's an example of a stack trace _with_ the patch:
{code}
*** Got signal 8 (Floating point exception)! ***
/home/cmccabe/hadoop1/hadoop-hdfs-project/hadoop-hdfs/target/native/target/usr/local/lib/libhdfs.so.0.0.0(+0x8054)[0x7fd29fcc3054]
/usr/local/lib/libjvm.so(+0x71150a)[0x7fd29f5a450a]
/usr/local/lib/libjvm.so(+0x70e4ab)[0x7fd29f5a14ab]
/usr/local/lib/libjvm.so(JVM_handle_linux_signal+0x170)[0x7fd29f5a4ff0]
/usr/local/lib/libjvm.so(+0x70e3be)[0x7fd29f5a13be]
/lib64/libpthread.so.0(+0xfd00)[0x7fd29faadd00]
/home/cmccabe/hadoop1/hadoop-hdfs-project/hadoop-hdfs/target/native/target/usr/local/lib/libhdfs.so.0.0.0(hdfsOpenFile+0x6b)[0x7fd29fcbf33b]
./hadoop-hdfs-project/hadoop-hdfs/target/native/test_libhdfs_threaded[0x401737]
./hadoop-hdfs-project/hadoop-hdfs/target/native/test_libhdfs_threaded[0x401f00]
/lib64/libpthread.so.0(+0x7f05)[0x7fd29faa5f05]
/lib64/libc.so.6(clone+0x6d)[0x7fd29ebde10d]
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGFPE (0x8) at pc=0x00007fd29fcbf33b, pid=1087, tid=140540761745152
#
# JRE version: 6.0_29-b11
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.4-b02 mixed mode linux-amd64
compressed oops)
# Problematic frame:
# C [libhdfs.so.0.0.0+0x433b] unsigned char+0x6b
#
# An error report file with more information is saved as:
# /home/cmccabe/hadoop1/hs_err_pid1087.log
2012-08-02 19:39:19,416 INFO FSNamesystem.audit
(FSNamesystem.java:logAuditEvent(252)) - allowed=true ugi=cmccabe
(auth:SIMPLE) ip=/127.0.0.1 cmd=mkdirs src=/tlhData0001
dst=null perm=cmccabe:supergroup:rwxr-xr-x
Segmentation fault
{code}
There's a lot more information in the latter. including the name of the
function where the problem occurred.
> libhdfs: improve native stack traces
> ------------------------------------
>
> Key: HDFS-3757
> URL: https://issues.apache.org/jira/browse/HDFS-3757
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: libhdfs
> Affects Versions: 2.2.0-alpha
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Priority: Minor
> Attachments: HDFS-3757.001.patch
>
>
> When libhdfs crashes, we often don't get very good stack traces. It would be
> nice to get a better stack trace for the thread that crashed.
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