So the jtreg uncaughtException code is doing a join() on the target
Thread while holding the monitor lock of the ThreadGroup - ouch! Where
do we file jtreg bugs?
David
On 11/10/2011 1:44 AM, Chris Hegarty wrote:
On 10/10/2011 15:52, Alan Bateman wrote:
Chris Hegarty wrote:
Naoto,
Forgot to add, you can probably just push the changes for the test
along with your source changes. I modified it a little since last
review. Reproduces one in about every ten times on one of our Dual
core Linux x64 boxes.
Is it the CME that duplicates for you? I'm still wondering about the
original failure mode which was a timeout, presumably a looping thread
or deadlock or something else.
This duplicates CME and deadlock. The deadlock would appear to happen
because jtreg tries to cleanup the thread that throws the CME, uncaught
exception. Look for 0xea769858 below.
"Thread-7" prio=10 tid=0x0a026c00 nid=0x3c30 in Object.wait() [0xd00fe000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0xea769858> (a java.lang.Thread)
at java.lang.Thread.join(Thread.java:1266)
- locked <0xea769858> (a java.lang.Thread)
at
com.sun.javatest.regtest.MainAction$SameVMThreadGroup.cleanup(MainAction.java:760)
at
com.sun.javatest.regtest.MainAction$SameVMThreadGroup.uncaughtException(MainAction.java:727)
- locked <0xea766988> (a
com.sun.javatest.regtest.MainAction$SameVMThreadGroup)
at java.lang.Thread.dispatchUncaughtException(Thread.java:1964)
"Thread-6" prio=10 tid=0x0a022000 nid=0x3c2f waiting for monitor entry
[0xd0256000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.ThreadGroup.threadTerminated(ThreadGroup.java:942)
- waiting to lock <0xea766988> (a
com.sun.javatest.regtest.MainAction$SameVMThreadGroup)
at java.lang.Thread.exit(Thread.java:732)
"SameVMThread" prio=10 tid=0xd058a000 nid=0x3c2e waiting for monitor
entry [0xd02a6000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.ThreadGroup.add(ThreadGroup.java:885)
- waiting to lock <0xea766988> (a
com.sun.javatest.regtest.MainAction$SameVMThreadGroup)
at java.lang.Thread.start(Thread.java:687)
- locked <0xea790160> (a Bug6989440$TestThread)
at Bug6989440.main(Bug6989440.java:47)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at
com.sun.javatest.regtest.MainAction$SameVMRunnable.run(MainAction.java:680)
at java.lang.Thread.run(Thread.java:722)
.....
-Chris.
-Alan.
