Re: [BLACKBOX] Illegal Memory Access with Windows 7 - Update 4 from [at]} on 2013-08-24 (BB-FullArchive.mbox)

From: [at]} <>
Date: Sun, 25 Aug 2013 00:37:44 +0800

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��z{S��}�ĝ��xjǺHi Robert,

I make a patch for the Kernel.NewBlock ,you'd better test it again.

Regards,
luowy

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----- ?? -----
???: Robert Campbell
? ?: [BLACKBOX] Illegal Memory Access with Windows 7 - Update 4
? ?: 2013?8?21? 3:37:05

The story continues ...

A couple of my colleagues have Windows 7 machines at home, and they have tested
my BlackBox installation on them.

Both machines were able to allocate 1600 MByte, which means that my 800 MByte
limit is some strange interaction with BlackBox
and Windows 7 (both 32-bit & 64-bit) (* as configured by our IT supplier *). I
wonder if I will ever be able to find the cause.

(Remember, a C# .NET test on both these machines could return 1700 MBtye.)

I attach a simpler test program designed to check the available memory, rather
than to stress the garbage collector (in both .pdf & StdCoder formats).

When I run it on XP machines it allocates about 150 10 MByte Blobs.

But when I run it many times it sometimes crashes (usually after about 10 runs,
sometimes after rather more.)

The error is that 'b' is NIL in the "WHILE b.size ...." line of this procedure
called from Kernel.NewBlock.

     PROCEDURE OldBlock (size: INTEGER): FreeBlock; (* size MOD 16 = 0 *)
         VAR b, l: FreeBlock; s, i: INTEGER;
     BEGIN
         IF debug & (watcher # NIL) THEN watcher(3) END;
         s := size - 4;
         i := MIN(N - 1, s DIV 16);
         WHILE (i # N - 1) & (free[i] = sentinel) DO INC(i) END;
         b := free[i]; l := NIL;
         WHILE b.size < s DO l := b; b := b.next END;
         IF b # sentinel THEN
             IF l = NIL THEN free[i] := b.next ELSE l.next := b.next END
         ELSE b := NIL
         END;
         RETURN b
     END OldBlock;

It seems that even with the latest patches discussed there is still a logical
error in the BlackBox allocation code.

I noticed that Helmut Zinn also reported a crash with his tests.

Regards

Robert

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\uc1\pard\plain\deftab360 \f0\fs20 Hi Robert,\par
\par
I  make a patch for the Kernel.NewBlock ,you'd better test it again.\par
\par
Regards, \par
luowy\par
\par
\par
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\par
----- ?? ----- \par
???: Robert Campbell \par
? ?: [BLACKBOX] Illegal Memory Access with Windows 7 - Update 4\par
? ?: 2013?8?21?  3:37:05\par
\par
The story continues ...\par
\par
A couple of my colleagues have Windows 7 machines at home, and they have tested \par
my BlackBox installation on them.\par
\par
Both machines were able to allocate 1600 MByte, which means that my 800 MByte \par
limit is some strange interaction with BlackBox\par
and Windows 7 (both 32-bit &amp; 64-bit) (* as configured by our IT supplier *). I \par
wonder if I will ever be able to find the cause.\par
\par
(Remember, a C# .NET test on both these machines could return 1700 MBtye.)\par
\par
\par
I attach a simpler test program designed to check the available memory, rather \par
than to stress the garbage collector (in both .pdf &amp; StdCoder formats).\par
\par
\par
When I run it on XP machines it allocates about 150 10 MByte Blobs.\par
\par
But when I run it many times it sometimes crashes (usually after about 10 runs, \par
sometimes after rather more.)\par
\par
The error is that 'b' is NIL in the "WHILE b.size ...." line of this procedure \par
called from  Kernel.NewBlock.\par
\par
     PROCEDURE OldBlock (size: INTEGER): FreeBlock;    (* size MOD 16 = 0 *)\par
         VAR b, l: FreeBlock; s, i: INTEGER;\par
     BEGIN\par
         IF debug &amp; (watcher # NIL) THEN watcher(3) END;\par
         s := size - 4;\par
         i := MIN(N - 1, s DIV 16);\par
         WHILE (i # N - 1) &amp; (free[i] = sentinel) DO INC(i) END;\par
         b := free[i]; l := NIL;\par
         WHILE b.size &lt; s DO l := b; b := b.next END;\par
         IF b # sentinel THEN\par
             IF l = NIL THEN free[i] := b.next ELSE l.next := b.next END\par
         ELSE b := NIL\par
         END;\par
         RETURN b\par
     END OldBlock;\par
\par
\par
It seems that even with the latest patches discussed there is still a logical \par
error in the BlackBox allocation code.\par
\par
I noticed that Helmut Zinn also reported a crash with his tests.\par
\par
\par
Regards\par
\par
Robert\par
\par
\par
\par
\par
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  W77Q,...\par
  --- end of encoding ---\par
\par
\par
----\par
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Received on Sat Aug 24 2013 - 18:37:44 UTC

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