[Bug java/37051] New: Random failures running ECJ 3.4 (threading problem?)

[Bug java/37051] New: Random failures running ECJ 3.4 (threading problem?)

[chewi at aura-online dot co dot uk]

I have been encountering random failures when running ECJ 3.4. ECJ 3.3 works
fine and I did also encounter random failures with Sun's VM so I initially
filed a bug at eclipse.org. However, further tests have indicated that there
are two different issues here, one affecting GCJ and one affecting Sun, hence I
am filing this bug report now.

The failures only occur when ECJ is run with multiple threads. They do not
occur when -Djdt.compiler.useSingleThread=true is specified and they also do
not occur on single core machines. I have only seen the failures on the x86_64
platform but it could possibly affect others too. The frequency of the failures
varies but they usually occur around once every 10 tries. The error messages
also vary but they usually look like this.

java.lang.NullPointerException
   at org.eclipse.jdt.internal.compiler.ReadManager.run(ReadManager.java:160)
   at java.lang.Thread.run(libgcj.so.90)

java.lang.NullPointerException
   at
org.eclipse.jdt.internal.compiler.util.Util.getFileCharContent(Util.java:226)
   at
org.eclipse.jdt.internal.compiler.batch.CompilationUnit.getContents(CompilationUnit.java:71)
   at org.eclipse.jdt.internal.compiler.ReadManager.run(ReadManager.java:160)
   at java.lang.Thread.run(libgcj.so.90)

I have reproduced this on my usual Gentoo Linux system but also managed to
reproduce it on a fresh installation of Ubuntu Intrepid Ibex Alpha 3 under KVM.
So far, I have only tried GCC 4.3.1. For more details, see the original bug
report at...

https://bugs.eclipse.org/bugs/show_bug.cgi?id=241225


-- 
           Summary: Random failures running ECJ 3.4 (threading problem?)
           Product: gcc
           Version: 4.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: chewi at aura-online dot co dot uk
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37051

[Bug java/37051] Random failures running ECJ 3.4 (threading problem?)

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2008-08-10 20:22 -------
This sounds like there is a race condition inside ecj and not a bug in GCJ.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37051

[Bug java/37051] Random failures running ECJ 3.4 (threading problem?)

[chewi at aura-online dot co dot uk]

------- Comment #2 from chewi at aura-online dot co dot uk  2008-08-10 20:57 -------
Can this please be verified? They have already closed the bug on their end and
I don't have the knowledge to do this myself.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37051

[Bug java/37051] Random failures running ECJ 3.4 (threading problem?)

[aph at gcc dot gnu dot org]

------- Comment #3 from aph at gcc dot gnu dot org  2008-10-24 13:41 -------
I found this bug.

There's a long discussion at
http://gcc.gnu.org/ml/java-patches/2008-q3/msg00094.html


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37051

[Bug java/37051] Random failures running ECJ 3.4 (threading problem?)

[chewi at aura-online dot co dot uk]

------- Comment #4 from chewi at aura-online dot co dot uk  2008-10-24 14:00 -------
Thank you very much! I was starting to feel like a raving lunatic trying to
prove this one.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37051

[Bug java/37051] Random failures running ECJ 3.4 (threading problem?)

[pinskia at gcc dot gnu dot org]

------- Comment #5 from pinskia at gcc dot gnu dot org  2008-12-27 14:45 -------


*** This bug has been marked as a duplicate of 8995 ***


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37051