[Bug libgcj/10746] [3.3/3.4 regression] [win32] garbage collection crash in GCJ

["oyvind dot harboe at zylin dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10746



------- Additional Comments From oyvind dot harboe at zylin dot com  2003-09-09 07:04 -------
(My previous GCC build machine committed sucide after a power outage, and I 
haven't put together a new one yet).


Would it be any help if this was reproducable w/WINE under Linux?

>I read the screen dump as saying that this died in _Jv_NewString because
>it found that the object returned by _Jv_AllocString had (presumably)
>both a zero data and zero boffset field.  Thus it was trying to copy
>characters to a zero target address.
>
>This is strange since _Jv_AllocString sets both of these fields to
>nonzero values just before this.

I've only seen this once the AllocString problem once, but I'll be on the 
lookout.

>I assume this is reproducible on a uniprocessor without "hyperthreading"?

Yes. At least three single CPU machines: AMD 1800, Pentium III 400, AMD 800.

>I just tried setting GC_PRINT_STATS in Windows 2000 with "set GC_PRINT_STATS=1"
>from the Windows command line.  That does seem to work, at least with the
>standalone collector compiled with VC++, though the output ends up in the
>file "gc.log", not on the screen.  I suspect that means the other environment
>variables will also do the right thing.

I suppose I need to build boehm-gc with this enabled...


C:\Temp\foo>\thisiscool-gcc-3.4\gcc-3.4\bin\gcj -g --main=Test Test.java -o test


C:\Temp\foo>dir
 Volume in drive C has no label.
 Volume Serial Number is 405F-43D6

 Directory of C:\Temp\foo

09.09.2003  09:03       <DIR>          .
09.09.2003  09:03       <DIR>          ..
09.09.2003  09:03            3?804?032 test.exe
08.09.2003  13:28                  784 Test.java
               2 File(s)      3?804?816 bytes
               2 Dir(s)  60?380?672?000 bytes free

C:\Temp\foo> set GC_PRINT_STATS=1

C:\Temp\foo>test
first thread 0
second thread 0
second thread 100000
first thread 100000
second thread 200000
first thread 200000
second thread 300000
first thread 300000
second thread 400000
second thread 500000
^C
C:\Temp\foo>dir
 Volume in drive C has no label.
 Volume Serial Number is 405F-43D6

 Directory of C:\Temp\foo

09.09.2003  09:03       <DIR>          .
09.09.2003  09:03       <DIR>          ..
09.09.2003  09:03            3?804?032 test.exe
08.09.2003  13:28                  784 Test.java
               2 File(s)      3?804?816 bytes
               2 Dir(s)  60?380?672?000 bytes free

C:\Temp\foo>