On solaris a SIGBUS occurs during a call to class.getInterfaces in some circumstances.

It occurs when a locally loaded class tries to get the interfaces from a class loaded
by the AppletLoader. It does not occur when an applet loaded class calls getInterfaces()
or a Applet loaded class calls getInterfaces before the local class.
It seems related to delayed resolution of the interfaces.

Here is a script that will extract the needed files, compile and run the appletviewer
to demonstrate the problem. Copy and Paste the following down to EOFEOF to a shell
then invoke the script as "sh setup".

% cat >setup <<EOFEOF
#!/bin/sh
cat >Touch.java <<EOF
public class Touch {
    public void interfaces(Class cl) {
Class[] intf = cl.getInterfaces();
for (int i = 0; i < intf.length; i++) {
System.out.println(" - " + intf[i].getName());
}
    }

}
EOF

cat >TestApplet.java <<EOF
/* Applet to exercise a bug that causes a SIGBUS error
 * when a locally loaded class tries to get the interface from an
 * AppletLoaded class.
 */

public class TestApplet extends java.applet.Applet {

    public synchronized void init() {
try {
// Class sample is loaded using the applet loader
Sample i = new Sample();

// Class Touch is in CLASSPATH and is loaded locally
Touch t = new Touch();

// Invoke the locally loaded class to get the interfaces
t.interfaces(i.getClass());

System.out.println("Done.");
} catch (Exception ex) {
ex.printStackTrace();
}
    }
}

interface EmptyInterface {}

class Sample implements EmptyInterface {
}
EOF

cat >test.html <<EOF
<applet code="TestApplet" width=200 height=100>
</applet>
EOF

javac *.java
mkdir classes
mv Touch.class classes
CLASSPATH=./classes
appletviewer test.html
EOFEOF


% sh setup

SIGBUS 10* bus error
    si_signo [10]: SIGBUS 10* bus error
    si_errno [0]: Error 0
    si_code [1]: BUS_ADRERR [addr: 0x25]

stackbase=EF431000, stackpointer=EF42FE08

Full thread dump:
    "Screen Updater" (TID:0xee303318, sys_thread_t:0xef090de0) prio=4
java.lang.Object.wait(Object.java)
sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:75)
sun.awt.ScreenUpdater.run(ScreenUpdater.java:95)
    "AWT-Motif" (TID:0xee302fa8, sys_thread_t:0xef0c0de0) prio=5
java.lang.Thread.run(Thread.java)
    "AWT-Input" (TID:0xee302f80, sys_thread_t:0xef0f0de0) prio=5
    "thread applet-TestApplet" (TID:0xee302db0, sys_thread_t:0xef430de0) prio=6: pending=java.lang.NoClassDefFoundError *current thread*
Touch.interfaces(Touch.java:3)
TestApplet.init(TestApplet.java:14)
sun.applet.AppletPanel.run(AppletPanel.java:243)
java.lang.Thread.run(Thread.java)
    "Finalizer thread" (TID:0xee300370, sys_thread_t:0xef460de0) prio=1
    "Async Garbage Collector" (TID:0xee300318, sys_thread_t:0xef490de0) prio=1
    "Idle thread" (TID:0xee3002a0, sys_thread_t:0xef4c0de0) prio=0
    "clock handler" (TID:0xee3001f8, sys_thread_t:0xef4f0de0) prio=11
    "main" (TID:0xee3000a0, sys_thread_t:0x7da50) prio=5
Monitor Cache Dump:
    unknown key (key=0xef490de0): monitor owner: "Async Garbage Collector"
    sun.awt.motif.MToolkit@EE302F68/EE33ECB0 (key=0xee302f68): unowned
Waiting to be notified:
"AWT-Input"
    sun.awt.ScreenUpdater@EE303318/EE33F6C0 (key=0xee303318): unowned
Waiting to be notified:
"Screen Updater"
    TestApplet@EE303820/EE342A48 (key=0xee303820): monitor owner: "thread applet-TestApplet"
Registered Monitor Dump:
    Finalize me queue lock: unowned
Waiting to be notified:
"Finalizer thread"
    Thread queue lock: unowned
Waiting to be notified:
"main"
    Class lock: unowned
    Java stack lock: unowned
    Code rewrite lock: unowned
    Heap lock: unowned
    Has finalization queue lock: unowned
    Monitor IO lock: unowned
    Child death monitor: unowned
    Event monitor: unowned
    I/O monitor: unowned
    Alarm monitor: unowned
Waiting to be notified:
"clock handler"
    Sbrk lock: unowned
    Monitor cache lock: unowned
    Monitor registry: monitor owner: "thread applet-TestApplet"
Thread Alarm Q:
Abort(coredump)



A stack trace from dbx follows:

(debugger) where
=>[1] java_lang_Class_getInterfaces(0xee300838, 0xef430278, 0x7fb8c, 0x959d8, 0x81010100, 0x0), at 0x26b20
  [2] Java_java_lang_Class_getInterfaces_stub(0xfb2c0, 0xef430ccc, 0x12c, 0x959d8, 0xef430ccc, 0xee33e954), at 0x325b0
  [3] invokeNativeMethod(0xee300838, 0xa847c, 0x1, 0xef430ccc, 0x400, 0xee33e959), at 0x30594
  [4] invokeLazyNativeMethod(0xee300838, 0xa847c, 0x1, 0xef430ccc, 0x0, 0xee33e87f), at 0x30928
  [5] ExecuteJava(0xef430ba6, 0xef430ccc, 0xfb288, 0xfb2b0, 0xfb298, 0x14af49), at 0x53918
  [6] do_execute_java_method_vararg(0xef430ccc, 0xee302eb0, 0x98f8c, 0x98f90, 0x0, 0x0), at 0x42b8c
  [7] execute_java_dynamic_method(0x0, 0xee302eb0, 0x98f8c, 0x98f90, 0xefffde74, 0x0), at 0x4186c
  [8] ThreadRT0(0xee302eb0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0x61fcc
  [9] start_func(0x1, 0xee302eb0, 0x61ea0, 0x0, 0x0, 0x0), at 0x79f58
(debugger)

The description field as copied from bug report 1260371 follows:

Calling the Class.getInterfaces() method causes the VM to core dump if the interface
class file is missing. The following is an example. If you compile Sample.java and
remove EmptyInterface.class and run Sample the VM gets a bus error.



zaphod: sigbus, 134 > cat Sample.java
class Sample implements EmptyInterface {
    public static void main(String[] args)
    {
Sample sample = new Sample();
System.out.println(sample.getClass().getInterfaces());
    }
}
zaphod: sigbus, 135 > cat EmptyInterface.java
interface EmptyInterface {}
zaphod: sigbus, 136 > javac Sample.java
zaphod: sigbus, 137 > rm EmptyInterface.class
rm: remove EmptyInterface.class (y/n)? y
zaphod: sigbus, 138 > java Sample
SIGBUS 10* bus error
    si_signo [10]: SIGBUS 10* bus error
    si_errno [0]: Error 0
    si_code [1]: BUS_ADRERR [addr: 0x35]

stackbase=EFFFF77C, stackpointer=EFFFF440

Full thread dump:
    "Finalizer thread" (TID:0xee7003a0, sys_thread_t:0xee3f1de0) prio=1
    "Async Garbage Collector" (TID:0xee700358, sys_thread_t:0xef441de0) prio=1
    "Idle thread" (TID:0xee700310, sys_thread_t:0xef471de0) prio=0
    "clock handler" (TID:0xee7000d0, sys_thread_t:0xef551de0) prio=11
    "main" (TID:0xee7000a0, sys_thread_t:0x82690) prio=5: pending=java.lang.NoClassDefFoundError *current thread*
Sample.main(Sample.java:5)
Monitor Cache Dump:
Registered Monitor Dump:
    Finalize me queue lock: unowned
    Thread queue lock: unowned
    Class lock: unowned
    String intern lock: unowned
    Java stack lock: unowned
    Code rewrite lock: unowned
    Heap lock: unowned
    Has finalization queue lock: unowned
    Monitor IO lock: unowned
    Child death monitor: unowned
    Event monitor: unowned
    I/O monitor: unowned
    Alarm monitor: unowned
Waiting to be notified:
"clock handler"
    Sbrk lock: unowned
    Monitor cache lock: unowned
    Monitor registry: monitor owner: "main"
Thread Alarm Q:
Abort (core dumped)
zaphod: sigbus, 139 >