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https://issues.apache.org/jira/browse/HDFS-11851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162260#comment-16162260
]
Ruslan Dautkhanov commented on HDFS-11851:
------------------------------------------
[~jzhuge], I have following exception that matches HDFS-11851, doesn't it? See
below:
{code}
$ 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 () from /lib64/libpthread.so.0
#1 0x00007fddd9f0fd02 in _L_lock_791 () from /lib64/libpthread.so.0
#2 0x00007fddd9f0fc08 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3 0x00007fddda9f3e26 in mutexLock () from
/opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#4 0x00007fddda9ed6f1 in setTLSExceptionStrings () from
/opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#5 0x00007fddda9ec38c in printExceptionAndFreeV () from
/opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#6 0x00007fddda9ec52d in printExceptionAndFree () from
/opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#7 0x00007fddda9ed46b in getJNIEnv () from
/opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#8 0x00007fddda9eee94 in hdfsBuilderConnect () from
/opt/cloudera/parcels/CDH/lib64/libhdfs.so.0.0.0
#9 0x0000000000400950 in main ()
{code}
It is from a Hadoop-2.6 based distribution of Hadoop (CDH 5.10).
> getGlobalJNIEnv() may deadlock if exception is thrown
> -----------------------------------------------------
>
> Key: HDFS-11851
> URL: https://issues.apache.org/jira/browse/HDFS-11851
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: libhdfs
> Affects Versions: 3.0.0-alpha4
> Reporter: Henry Robinson
> Assignee: Sailesh Mukil
> Priority: Blocker
> Fix For: 3.0.0-alpha4
>
> Attachments: HDFS-11851.000.patch, HDFS-11851.001.patch,
> HDFS-11851.002.patch, HDFS-11851.003.patch, HDFS-11851.004.patch,
> HDFS-11851.005.patch
>
>
> HDFS-11529 introduced a deadlock into {{getGlobalJNIEnv()}} if an exception
> is thrown. {{getGlobalJNIEnv()}} holds {{jvmMutex}}, but
> {{printExceptionAndFree()}} will eventually try to acquire that lock in
> {{setTLSExceptionStrings()}}.
> The exception might get caught from {{loadFileSystems}}:
> {code}
> jthr = invokeMethod(env, NULL, STATIC, NULL,
> "org/apache/hadoop/fs/FileSystem",
> "loadFileSystems", "()V");
> if (jthr) {
> printExceptionAndFree(env, jthr, PRINT_EXC_ALL,
> "loadFileSystems");
> }
> }
> {code}
> and here's the relevant parts of the stack trace from where I call this API
> in Impala, which uses {{libhdfs}}:
> {code}
> #0 __lll_lock_wait () at
> ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
> #1 0x00007ffff4a8d657 in _L_lock_909 () from
> /lib/x86_64-linux-gnu/libpthread.so.0
> #2 0x00007ffff4a8d480 in __GI___pthread_mutex_lock (mutex=0x47ce960
> <jvmMutex>) at ../nptl/pthread_mutex_lock.c:79
> #3 0x0000000002f06056 in mutexLock (m=<optimized out>) at
> /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/os/posix/mutexes.c:28
> #4 0x0000000002efe817 in setTLSExceptionStrings (rootCause=0x0,
> stackTrace=0x0) at
> /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.c:581
> #5 0x0000000002f065d7 in printExceptionAndFreeV (env=0x513c1e8,
> exc=0x508a8c0, noPrintFlags=<optimized out>, fmt=0x34349cf "loadFileSystems",
> ap=0x7fffffffb660)
> at
> /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/exception.c:183
> #6 0x0000000002f0683d in printExceptionAndFree (env=<optimized out>,
> exc=<optimized out>, noPrintFlags=<optimized out>, fmt=<optimized out>)
> at
> /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/exception.c:213
> #7 0x0000000002eff60f in getGlobalJNIEnv () at
> /data/2/jenkins/workspace/impala-hadoop-dependency/hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.c:463
> {code}
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