ADDITIONAL SYSTEM INFORMATION :
OS: Red Hat Enterprise Linux
System Locale: ja_JP.eucjp
Java Runtime: Java SE 8 Update 281

A DESCRIPTION OF THE PROBLEM :
When the openStream() method of an URL representing a resource in a jar file (such as jar:file:///example.jar!/com/example/Example.class) and the Charset.availableCharsets() method are called at the same time, a deadlock happens between sun.net.www.protocol.jar.JarFileFactory and sun.nio.cs.ext.ExtendedCharsets.

Maybe this bug is a duplicate of JDK-8143609, but JDK-8143609 is closed with Incomplete.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
(Use the source code for an executable test case)
$ javac DeadlockSample.java
$ for i in $(seq 1000); do LANG=ja_JP.eucjp java DeadlockSample; done


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
All commands are complete and nothing to print.
ACTUAL -
A command is not complete and print "!!!!! found deadlock !!!!!"

$ for i in $(seq 1000); do LANG=ja_JP.eucjp java DeadlockSample; done
!!!!! found deadlock !!!!!
^Z (Ctrl+Z)
[1]+ Stopped LANG=ja_JP.eucjp java DeadlockSample
$ bg
[1]+ LANG=ja_JP.eucjp java DeadlockSample &
$ jps
73652 Jps
73638 DeadlockSample
$ jstack 73638
2021-04-12 10:52:16
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.281-b09 mixed mode):

"Attach Listener" #10 daemon prio=9 os_prio=0 tid=0x00007fe6fc001000 nid=0x11fcd waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Thread-openJarURLConnectionStream" #9 prio=5 os_prio=0 tid=0x00007fe7300fd800 nid=0x11fb3 waiting for monitor entry [0x00007fe7175ff000]
   java.lang.Thread.State: BLOCKED (on object monitor)
at sun.nio.cs.AbstractCharsetProvider.charsetForName(AbstractCharsetProvider.java:160)
- waiting to lock <0x00000000eb816a98> (a sun.nio.cs.ext.ExtendedCharsets)
at java.nio.charset.Charset.lookupExtendedCharset(Charset.java:452)
at java.nio.charset.Charset.lookup2(Charset.java:476)
at java.nio.charset.Charset.lookup(Charset.java:464)
at java.nio.charset.Charset.isSupported(Charset.java:505)
at java.lang.StringCoding.lookupCharset(StringCoding.java:99)
at java.lang.StringCoding.encode(StringCoding.java:336)
at java.lang.String.getBytes(String.java:918)
at java.io.UnixFileSystem.canonicalize0(Native Method)
at java.io.UnixFileSystem.canonicalize(UnixFileSystem.java:172)
at java.io.File.getCanonicalPath(File.java:618)
at java.io.FilePermission$1.run(FilePermission.java:224)
at java.io.FilePermission$1.run(FilePermission.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.FilePermission.init(FilePermission.java:212)
at java.io.FilePermission.<init>(FilePermission.java:299)
at sun.net.www.protocol.file.FileURLConnection.getPermission(FileURLConnection.java:225)
at sun.net.www.protocol.jar.JarFileFactory.getPermission(JarFileFactory.java:225)
at sun.net.www.protocol.jar.JarFileFactory.getCachedJarFile(JarFileFactory.java:195)
at sun.net.www.protocol.jar.JarFileFactory.getOrCreate(JarFileFactory.java:103)
- locked <0x00000000eb8a9390> (a sun.net.www.protocol.jar.JarFileFactory)
at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:129)
at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:172)
at java.net.URL.openStream(URL.java:1067)
at DeadlockSample.openJarURLConnectionStream(DeadlockSample.java:55)
at DeadlockSample.access$100(DeadlockSample.java:6)
at DeadlockSample$2.run(DeadlockSample.java:25)
at java.lang.Thread.run(Thread.java:748)

"Thread-availableCharsets" #8 prio=5 os_prio=0 tid=0x00007fe7300fc000 nid=0x11fb2 waiting for monitor entry [0x00007fe717700000]
   java.lang.Thread.State: BLOCKED (on object monitor)
at sun.net.www.protocol.jar.JarFileFactory.getOrCreate(JarFileFactory.java:103)
- waiting to lock <0x00000000eb8a9390> (a sun.net.www.protocol.jar.JarFileFactory)
at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:129)
at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:172)
at java.net.URL.openStream(URL.java:1067)
at java.lang.ClassLoader.getSystemResourceAsStream(ClassLoader.java:1324)
at java.lang.Class.getResourceAsStream(Class.java:2221)
at sun.nio.cs.ext.SJIS_0213$1.run(SJIS_0213.java:81)
at sun.nio.cs.ext.SJIS_0213$1.run(SJIS_0213.java:79)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.cs.ext.SJIS_0213.<clinit>(SJIS_0213.java:78)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at sun.nio.cs.AbstractCharsetProvider.lookup(AbstractCharsetProvider.java:142)
at sun.nio.cs.AbstractCharsetProvider.access$000(AbstractCharsetProvider.java:45)
at sun.nio.cs.AbstractCharsetProvider$1.next(AbstractCharsetProvider.java:183)
- locked <0x00000000eb816a98> (a sun.nio.cs.ext.ExtendedCharsets)
at sun.nio.cs.AbstractCharsetProvider$1.next(AbstractCharsetProvider.java:173)
at java.nio.charset.Charset.put(Charset.java:539)
at java.nio.charset.Charset.access$200(Charset.java:271)
at java.nio.charset.Charset$3.run(Charset.java:581)
at java.nio.charset.Charset$3.run(Charset.java:573)
at java.security.AccessController.doPrivileged(Native Method)
at java.nio.charset.Charset.availableCharsets(Charset.java:572)
at DeadlockSample.availableCharsets(DeadlockSample.java:47)
at DeadlockSample.access$000(DeadlockSample.java:6)
at DeadlockSample$1.run(DeadlockSample.java:19)
at java.lang.Thread.run(Thread.java:748)

"Service Thread" #7 daemon prio=9 os_prio=0 tid=0x00007fe7300df800 nid=0x11fb0 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C1 CompilerThread1" #6 daemon prio=9 os_prio=0 tid=0x00007fe7300da800 nid=0x11faf waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #5 daemon prio=9 os_prio=0 tid=0x00007fe7300d8000 nid=0x11fae waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" #4 daemon prio=9 os_prio=0 tid=0x00007fe7300cc800 nid=0x11fad runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" #3 daemon prio=8 os_prio=0 tid=0x00007fe730082800 nid=0x11fac in Object.wait() [0x00007fe717dfc000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000eb808ee0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
- locked <0x00000000eb808ee0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)

"Reference Handler" #2 daemon prio=10 os_prio=0 tid=0x00007fe73007e000 nid=0x11fab in Object.wait() [0x00007fe717efd000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000eb806c00> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x00000000eb806c00> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)

"main" #1 prio=5 os_prio=0 tid=0x00007fe73000a800 nid=0x11fa7 in Object.wait() [0x00007fe7360ac000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00000000eb8fcb18> (a java.lang.Thread)
at java.lang.Thread.join(Thread.java:1252)
- locked <0x00000000eb8fcb18> (a java.lang.Thread)
at java.lang.Thread.join(Thread.java:1326)
at DeadlockSample.main(DeadlockSample.java:40)

"VM Thread" os_prio=0 tid=0x00007fe730074000 nid=0x11faa runnable

"GC task thread#0 (ParallelGC)" os_prio=0 tid=0x00007fe73001f800 nid=0x11fa8 runnable

"GC task thread#1 (ParallelGC)" os_prio=0 tid=0x00007fe730021800 nid=0x11fa9 runnable

"VM Periodic Task Thread" os_prio=0 tid=0x00007fe7300e2000 nid=0x11fb1 waiting on condition

JNI global references: 5


Found one Java-level deadlock:
=============================
"Thread-openJarURLConnectionStream":
  waiting to lock monitor 0x00007fe704006568 (object 0x00000000eb816a98, a sun.nio.cs.ext.ExtendedCharsets),
  which is held by "Thread-availableCharsets"
"Thread-availableCharsets":
  waiting to lock monitor 0x00007fe6f00d8ba8 (object 0x00000000eb8a9390, a sun.net.www.protocol.jar.JarFileFactory),
  which is held by "Thread-openJarURLConnectionStream"

Java stack information for the threads listed above:
===================================================
"Thread-openJarURLConnectionStream":
at sun.nio.cs.AbstractCharsetProvider.charsetForName(AbstractCharsetProvider.java:160)
- waiting to lock <0x00000000eb816a98> (a sun.nio.cs.ext.ExtendedCharsets)
at java.nio.charset.Charset.lookupExtendedCharset(Charset.java:452)
at java.nio.charset.Charset.lookup2(Charset.java:476)
at java.nio.charset.Charset.lookup(Charset.java:464)
at java.nio.charset.Charset.isSupported(Charset.java:505)
at java.lang.StringCoding.lookupCharset(StringCoding.java:99)
at java.lang.StringCoding.encode(StringCoding.java:336)
at java.lang.String.getBytes(String.java:918)
at java.io.UnixFileSystem.canonicalize0(Native Method)
at java.io.UnixFileSystem.canonicalize(UnixFileSystem.java:172)
at java.io.File.getCanonicalPath(File.java:618)
at java.io.FilePermission$1.run(FilePermission.java:224)
at java.io.FilePermission$1.run(FilePermission.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.io.FilePermission.init(FilePermission.java:212)
at java.io.FilePermission.<init>(FilePermission.java:299)
at sun.net.www.protocol.file.FileURLConnection.getPermission(FileURLConnection.java:225)
at sun.net.www.protocol.jar.JarFileFactory.getPermission(JarFileFactory.java:225)
at sun.net.www.protocol.jar.JarFileFactory.getCachedJarFile(JarFileFactory.java:195)
at sun.net.www.protocol.jar.JarFileFactory.getOrCreate(JarFileFactory.java:103)
- locked <0x00000000eb8a9390> (a sun.net.www.protocol.jar.JarFileFactory)
at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:129)
at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:172)
at java.net.URL.openStream(URL.java:1067)
at DeadlockSample.openJarURLConnectionStream(DeadlockSample.java:55)
at DeadlockSample.access$100(DeadlockSample.java:6)
at DeadlockSample$2.run(DeadlockSample.java:25)
at java.lang.Thread.run(Thread.java:748)
"Thread-availableCharsets":
at sun.net.www.protocol.jar.JarFileFactory.getOrCreate(JarFileFactory.java:103)
- waiting to lock <0x00000000eb8a9390> (a sun.net.www.protocol.jar.JarFileFactory)
at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:129)
at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:172)
at java.net.URL.openStream(URL.java:1067)
at java.lang.ClassLoader.getSystemResourceAsStream(ClassLoader.java:1324)
at java.lang.Class.getResourceAsStream(Class.java:2221)
at sun.nio.cs.ext.SJIS_0213$1.run(SJIS_0213.java:81)
at sun.nio.cs.ext.SJIS_0213$1.run(SJIS_0213.java:79)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.cs.ext.SJIS_0213.<clinit>(SJIS_0213.java:78)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at sun.nio.cs.AbstractCharsetProvider.lookup(AbstractCharsetProvider.java:142)
at sun.nio.cs.AbstractCharsetProvider.access$000(AbstractCharsetProvider.java:45)
at sun.nio.cs.AbstractCharsetProvider$1.next(AbstractCharsetProvider.java:183)
- locked <0x00000000eb816a98> (a sun.nio.cs.ext.ExtendedCharsets)
at sun.nio.cs.AbstractCharsetProvider$1.next(AbstractCharsetProvider.java:173)
at java.nio.charset.Charset.put(Charset.java:539)
at java.nio.charset.Charset.access$200(Charset.java:271)
at java.nio.charset.Charset$3.run(Charset.java:581)
at java.nio.charset.Charset$3.run(Charset.java:573)
at java.security.AccessController.doPrivileged(Native Method)
at java.nio.charset.Charset.availableCharsets(Charset.java:572)
at DeadlockSample.availableCharsets(DeadlockSample.java:47)
at DeadlockSample.access$000(DeadlockSample.java:6)
at DeadlockSample$1.run(DeadlockSample.java:19)
at java.lang.Thread.run(Thread.java:748)

Found 1 deadlock.


---------- BEGIN SOURCE ----------
import java.io.File;
import java.lang.management.ManagementFactory;
import java.net.URL;
import java.nio.charset.Charset;

public class DeadlockSample {
    public static void main(String[] args) throws Exception {
        File jarFile = new File(System.getProperty("java.home") + File.separator + "lib" + File.separator + "jsse.jar");
        String resourceInJarFile = "sun/security/provider/Sun.class";

        final URL url = new URL("jar:" + jarFile.toURI().toURL() + "!/" + resourceInJarFile);
        //System.out.println(url);

        // put entry in JarFileFactory.fileCache
        url.openStream().close();

        Thread t1 = new Thread(new Runnable() {
            public void run() {
                availableCharsets();
            }
        }, "Thread-availableCharsets");

        Thread t2 = new Thread(new Runnable() {
            public void run() {
                openJarURLConnectionStream(url);
            }
        }, "Thread-openJarURLConnectionStream");

        t1.start();
        t2.start();

        t1.join(2000L);
        t2.join(2000L);

        if (t1.isAlive() && t2.isAlive()) {
            long[] deadlockedThreads = ManagementFactory.getThreadMXBean().findDeadlockedThreads();
            if (deadlockedThreads != null && deadlockedThreads.length > 0) {
                System.err.println("!!!!! found deadlock !!!!!");
            }
            t1.join();
            t2.join();
        }
    }

    private static void availableCharsets() {
        try {
            Charset.availableCharsets();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    private static void openJarURLConnectionStream(URL url) {
        try {
           url.openStream();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

---------- END SOURCE ----------

FREQUENCY : occasionally