[ https://issues.apache.org/jira/browse/HDFS-11851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sailesh Mukil updated HDFS-11851: --------------------------------- Status: Patch Available (was: Open) > 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 > 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} -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org