Hi,
With Exec-Shield in place, the Kernel automatically adjusts the stack downward
by a random amount of bytes. This will cause the test failed occasionally on
IA-32, because the 11th requested chunk of address space (bfe00000-bff00000)
has already been used by the stack. For example, stack could be at
bfe0b000-bfe20000, and then, shmat(2) failed,
mykey to uniquely identify the shared memory segment 0x451005ae
Get shared memory segment (1048576 bytes)
Attach shared memory segment to process
ERROR [line: 205] shmat failed - return: 0xffffffff: Invalid argument
It looks like the stack adjustment has a range that it could be chosen, so I
changed the start of 11th address space to a lower address. Tests showed that
the stack will not go downward that much.
In addition, there are a few minor fixes,
- keep the width of comments within 72 characters.
- remove unnecessary 0x prefix.
Cai Qian
Signed-off-by: CAI Qian <[EMAIL PROTECTED]>
--- testcases/kernel/ipc/ipc_stress/shmem_test_06.c.orig 2008-10-07
17:41:31.624446064 +0800
+++ testcases/kernel/ipc/ipc_stress/shmem_test_06.c 2008-10-08
18:58:23.223863675 +0800
@@ -1,11 +1,12 @@
/*
* Copyright (C) Bull S.A. 1996
* Copyright (c) International Business Machines Corp., 2001
+ * Copyright (C) 2008 CAI Qian <[EMAIL PROTECTED]>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,8 +14,9 @@
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
*/
/*---------------------------------------------------------------------+
| shmem_test_06.c |
@@ -26,8 +28,7 @@
| 0x3 to 0xC and 0xE . |
| |
| Description: Simplistic test to verify that a process can obtain |
-| 11 shared memory regions in the adress space from |
-| 0x30000000 to 0xCFFFFFFF and 0xE0000000 to 0xEFFFFFFF. |
+| 11 shared memory regions. |
| |
| |
| Algorithm: * from 1 up to 11 |
@@ -90,7 +91,7 @@
0x90000000,
0xA0000000,
0xB0000000,
-0xBFE00000,
+0xBF000000,
};
int offsets_cnt = sizeof (offsets) /sizeof (offsets[0]);
/* Defines
@@ -206,7 +207,7 @@
}
- printf ("\n\tShared memory segment address : 0x%p \n",shmptr[i]);
+ printf ("\n\tShared memory segment address : %p \n",shmptr[i]);
printf ("\n\tIndex through shared memory segment ...\n");
-------------------------------------------------------------------------
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