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* [Bug java/25330]  New: A race condition in write_classfile
@ 2005-12-09 17:13 hjl at lucon dot org
  2005-12-10  1:48 ` [Bug java/25330] " hjl at lucon dot org
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: hjl at lucon dot org @ 2005-12-09 17:13 UTC (permalink / raw)
  To: java-prs

On a SMP machine, with "make -j4", I got

/export/build/gnu/gcc/build-x86_64-linux/gcc/gcj
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--encoding=UTF-8 --bootclasspath '' --classpath
..:/net/gnu-13/export/gnu/src/gcc/gcc/libjava:/export/build/gnu/gcc/build-x86_64-linux/x86_64-unknown-linux-gnu/32/libjava:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/w3c_dom:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/sax:.:
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echo timestamp > lists/gnu-javax-swing.stamp
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/export/build/gnu/gcc/build-x86_64-linux/gcc/gcj
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--encoding=UTF-8 --bootclasspath '' --classpath
..:/net/gnu-13/export/gnu/src/gcc/gcc/libjava:/export/build/gnu/gcc/build-x86_64-linux/x86_64-unknown-linux-gnu/32/libjava:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/w3c_dom:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/sax:.:
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/export/build/gnu/gcc/build-x86_64-linux/gcc/gcj
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-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -Wno-deprecated
--encoding=UTF-8 --bootclasspath '' --classpath
..:/net/gnu-13/export/gnu/src/gcc/gcc/libjava:/export/build/gnu/gcc/build-x86_64-linux/x86_64-unknown-linux-gnu/32/libjava:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/w3c_dom:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/sax:.:
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/export/build/gnu/gcc/build-x86_64-linux/gcc/gcj
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--encoding=UTF-8 --bootclasspath '' --classpath
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--encoding=UTF-8 --bootclasspath '' --classpath
..:/net/gnu-13/export/gnu/src/gcc/gcc/libjava:/export/build/gnu/gcc/build-x86_64-linux/x86_64-unknown-linux-gnu/32/libjava:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/w3c_dom:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/sax:.:
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--encoding=UTF-8 --bootclasspath '' --classpath
..:/net/gnu-13/export/gnu/src/gcc/gcc/libjava:/export/build/gnu/gcc/build-x86_64-linux/x86_64-unknown-linux-gnu/32/libjava:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/w3c_dom:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/sax:.:
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--encoding=UTF-8 --bootclasspath '' --classpath
..:/net/gnu-13/export/gnu/src/gcc/gcc/libjava:/export/build/gnu/gcc/build-x86_64-linux/x86_64-unknown-linux-gnu/32/libjava:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/w3c_dom:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/sax:.:
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--encoding=UTF-8 --bootclasspath '' --classpath
..:/net/gnu-13/export/gnu/src/gcc/gcc/libjava:/export/build/gnu/gcc/build-x86_64-linux/x86_64-unknown-linux-gnu/32/libjava:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/w3c_dom:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/sax:.:
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..:/net/gnu-13/export/gnu/src/gcc/gcc/libjava:/export/build/gnu/gcc/build-x86_64-linux/x86_64-unknown-linux-gnu/32/libjava:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/w3c_dom:/net/gnu-13/export/gnu/src/gcc/gcc/libjava/classpath/external/sax:.:
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/net/gnu-13/export/gnu/src/gcc/gcc/libjava/java/net/URL.java: In class
'java.net.VMNetworkInterface':
/net/gnu-13/export/gnu/src/gcc/gcc/libjava/java/net/URL.java: In method
'java.net.VMNetworkInterface.getInterfaces()':
/net/gnu-13/export/gnu/src/gcc/gcc/libjava/java/net/URL.java:1: fatal error:
can't create ./java/rmi/activation/ActivationMonitor.class: No such file or
directory
compilation terminated.
make[10]: *** [lists/gnu-src-gcc.stamp] Error 1
make[10]: *** Waiting for unfinished jobs....
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write_classfile in jcf-write.c:

      /* The .class file is initially written to a ".tmp" file so that
         if multiple instances of the compiler are running at once
         they do not see partially formed class files. */
      temporary_file_name = concat (class_file_name, ".tmp", NULL);
      stream = fopen (temporary_file_name, "wb");
      ...
      if (rename (temporary_file_name, class_file_name) == -1)
        {
          remove (temporary_file_name);
          fatal_error ("can't create %s: %m", class_file_name);
        }

There are at least 2 problems:

1. All processes use the same temporary_file_name. If 2 processes try to write
to the same class file, we are in trouble.
2. errno returned from rename is accessed after remove call which
may change errno.


-- 
           Summary: A race condition in write_classfile
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl at lucon dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25330


^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2007-01-30 21:01 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-12-09 17:13 [Bug java/25330] New: A race condition in write_classfile hjl at lucon dot org
2005-12-10  1:48 ` [Bug java/25330] " hjl at lucon dot org
2005-12-12 15:05 ` hjl at lucon dot org
2005-12-12 15:27 ` hjl at gcc dot gnu dot org
2007-01-30 21:01 ` tromey at gcc dot gnu dot org

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