java - JNI application hanging -


please how approach debugging jni application.

used jps pid of process that's running jvm:

$ jps 8248                <- pid of process span c++ application run jni stuff ...  8335 jps

now can attach gdb stack.

$ gdb -p 8248 gnu gdb (gdb) red hat enterprise linux 7.6.1-94.el7 ....  /cut/    (gdb) (gdb) bt #0  0x00007fddd9f141bd in __lll_lock_wait () /lib64/libpthread.so.0 #1  0x00007fddd9f0fd02 in _l_lock_791 () /lib64/libpthread.so.0 #2  0x00007fddd9f0fc08 in pthread_mutex_lock () /lib64/libpthread.so.0 #3  0x00007fddda9f3e26 in mutexlock () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #4  0x00007fddda9ed6f1 in settlsexceptionstrings () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #5  0x00007fddda9ec38c in printexceptionandfreev () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #6  0x00007fddda9ec52d in printexceptionandfree () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #7  0x00007fddda9ed46b in getjnienv () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #8  0x00007fddda9eee94 in hdfsbuilderconnect () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #9  0x0000000000400950 in main ()

notice it's hanging in sort of global mutex lock

i think gdb backtrace stack should useful identify root cause of issue.

this should generic jni debugging question? if if you're interested here's c code spans jvm jni interaction - https://gist.github.com/tagar/7c42f82f5538004bda2f4ea0b0e0adc5

java version "1.8.0_141" gcc version 4.8.5 20150623 (red hat 4.8.5-11) (gcc)

runtime environment:

export ld_library_path=$cdh/lib64:$java_home/jre/lib/$os_arch/server export classpath=`hadoop classpath`  export _java_options=-xss1280m

thanks leads.

also, based on hanging stack trying fail 

#6  0x00007fddda9ec52d in printexceptionandfree () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0 #7  0x00007fddda9ed46b in getjnienv () /opt/cloudera/parcels/cdh/lib64/libhdfs.so.0.0.0

but hangs on attempt printexceptionandfreev () -> settlsexceptionstrings () -> mutexlock () lock..

root cause found https://issues.apache.org/jira/browse/hdfs-11851

thanks.


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