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Date:      Thu, 30 Jul 2020 06:09:02 +0000
From:      bugzilla-noreply@freebsd.org
To:        ports-bugs@FreeBSD.org
Subject:   [Bug 248360] calling timer_delete from OpenJDK twice causing a SIGSEGEV
Message-ID:  <bug-248360-7788@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248360

            Bug ID: 248360
           Summary: calling timer_delete from OpenJDK twice causing a
                    SIGSEGEV
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: aploese@gmx.de
 Attachment #216874 text/plain
         mime type:

Created attachment 216874
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D216874&action=
=3Dedit
Calling timer_delete twice from a native methd of java causing a SIGSEGEV

Creating a timer and deleting that timer a second time does not set the err=
no
to EINVAL but crashes the whole VM (this happens in OpenBSD too... but not =
on
linux).
calling timer_delete twice without returning to java after the first call w=
ill
succeed without a SIGSEGEV.=20
I don't know if this is an OpenJDK or a LibC bug or just a feature...


simply run run.sh

here files to reproduce the error

file run.sh
>>>>
#!/bin/sh

#linux export JAVA_HOME=3D/usr/lib/jvm/java-11-openjdk-amd64
#freebsd
export JAVA_HOME=3D/usr/local/openjdk14/

gcc -fPIC TimerCreateDelete.c -I $JAVA_HOME/include -I $JAVA_HOME/include/l=
inux
-I $JAVA_HOME/include/freebsd -pthread -lrt  || exit 1

./a.out

javac TimerCreateDelete.java || exit 1

gcc -c -fPIC TimerCreateDelete.c -I $JAVA_HOME/include -I
$JAVA_HOME/include/linux -I $JAVA_HOME/include/freebsd || exit 1

gcc -shared -o libTimerCreateDelete.so TimerCreateDelete.o -pthread -lrt ||
exit 1

java TimerCreateDelete `pwd`
<<<<

file TimerCreateDelete.c
>>>>
#include <jni.h>
#include <time.h>
#include <errno.h>

#ifdef __cplusplus
extern "C" {
#endif

static timer_t myTimer;

/*
 * Class:     TimerCreateDelete
 * Method:    timer_create
 * Signature: ()I
 */
JNIEXPORT jint JNICALL Java_TimerCreateDelete_timer_1create
  (JNIEnv *env, jclass clazz) {
    if (timer_create(CLOCK_MONOTONIC, NULL, &myTimer)) {
        return errno;
    } else {
        return 0;
    }
}

/*
 * Class:     TimerCreateDelete
 * Method:    timer_delete
 * Signature: ()I
 */
JNIEXPORT jint JNICALL Java_TimerCreateDelete_timer_1delete
  (JNIEnv *env, jclass clazz) {
    if (timer_delete(myTimer)) {
        return errno;
    } else {
        return 0;
    }
}


int main(void) {
    puts("Run from native main");=20
    int result;=20=20=20=20
    result =3D Java_TimerCreateDelete_timer_1create(NULL, NULL);
    printf("time_create: %d\n", result);=20=20=20=20
    result =3D Java_TimerCreateDelete_timer_1delete(NULL, NULL);
    printf("time_delete: %d\n", result);=20=20=20=20
    result =3D Java_TimerCreateDelete_timer_1delete(NULL, NULL);
    printf("time_delete: %d\n", result);=20=20=20=20
    puts("Timer destroyed");=20
    return 0;
}


#ifdef __cplusplus
}
#endif
<<<<

file TimerCreateDelete.java
>>>>

/**
 *
 * @author aploese
 */
public class TimerCreateDelete {

    private static native int timer_create();

    private static native int timer_delete();

    public static void main(String[] args) {
        System.load(args[0] + "/libTimerCreateDelete.so");
        int errno;
        System.out.println("Will call timer_create");
        errno =3D timer_create();
        System.out.println("timer_create errno: " + errno);

        System.out.println("Will call timer_delete first time");
        errno =3D timer_delete();
        System.out.println("timer_delete errno: " + errno);

        System.out.println("Will call timer_delete second time");
        errno =3D timer_delete();
        System.out.println("timer_delete errno: " + errno);
    }
}
<<<<

--=20
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