[Bug java/25330] New: A race condition in write_classfile

[Bug java/25330] New: A race condition in write_classfile

[hjl at lucon dot org]

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

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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....
echo timestamp > lists/java-rmi-dgc.stamp

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

[Bug java/25330] A race condition in write_classfile

[hjl at lucon dot org]

------- Comment #1 from hjl at lucon dot org  2005-12-10 01:48 -------
I got another one:

/export/build/gnu/gcc/build-x86_64-linux/gcc/gcj
-B/export/build/gnu/gcc/build-x86_64-linux/x86_64-unknown-linux-gnu/libjava/
-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/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:.:
-C -d . -MD -MF lists/java-rmi-dgc.deps -MT lists/java-rmi-dgc.stamp -MP
@lists/java-rmi-dgc.list
/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/ActivationSystem.class: No such file or
directory
compilation terminated.
make[8]: *** [lists/gnu-src-gcc.stamp] Error 1
make[8]: *** Waiting for unfinished jobs....
echo timestamp > lists/java-rmi-dgc.stamp

This time, there wass no "java/rmi/activation" directory under libjava:

[hjl@gnu-20 build-x86_64-linux]$ ls x86_64-unknown-linux-gnu/libjava/java/
io  lang  net  nio  text  util


-- 


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

[Bug java/25330] A race condition in write_classfile

[hjl at lucon dot org]

------- Comment #2 from hjl at lucon dot org  2005-12-12 15:05 -------
A patch is posted at

http://gcc.gnu.org/ml/gcc-patches/2005-12/msg00794.html


-- 

hjl at lucon dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch


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

[Bug java/25330] A race condition in write_classfile

[hjl at gcc dot gnu dot org]

------- Comment #3 from hjl at gcc dot gnu dot org  2005-12-12 15:27 -------
Subject: Bug 25330

Author: hjl
Date: Mon Dec 12 15:27:43 2005
New Revision: 108411

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=108411
Log:
2005-12-12  H.J. Lu  <hongjiu.lu@intel.com>

        PR java/25330
        * jcf-write.c (write_classfile): Use PID in temporary class
        file. Save/restore errno when reporting error.

Modified:
    trunk/gcc/java/ChangeLog
    trunk/gcc/java/jcf-write.c


-- 


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

[Bug java/25330] A race condition in write_classfile

[tromey at gcc dot gnu dot org]

------- Comment #4 from tromey at gcc dot gnu dot org  2007-01-30 21:01 -------
Fix was in 4.2.


-- 

tromey at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.2.0


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