Hi,all
when I run the below test program :
#./hugemmap04 -I 3600 -H /var/hugetlbfs
I found it returned quickly.
I used gdb tool to debug it, it returned error with the 'SEGBUS' signal error,
and the error occurred in the 178 lines '*(int*)addr = 0;'.
it's okay when I add this line
write(fildes, "write some words to the TEMPFILE file\n",40);
you can run this c program to find the error :
$ cat test.c
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>
char * TEMPFILE="mmapfile";
int freepages = 0;
int main()
{
long *addr;
int fd;
long long mapsize;
if ((fd = open(TEMPFILE, O_RDWR | O_CREAT | O_TRUNC,00777)) < 0) {
printf("open error\n");
return -2;
}
freepages = 100;
mapsize =(long long)freepages * 2048 * 1024;
printf("mapsize is %lld \n",mapsize);
addr = (long *)mmap(NULL,mapsize,
PROT_READ | PROT_WRITE, MAP_SHARED, fd,0);
if (addr == MAP_FAILED) {
printf("mmap error\n");
return -1;
}
/* if you enable this line,there will be no error. */
//write(fd,"just write some words.\n",20);
*(int *)addr = 0;
printf("Successfully!\n");
close(fd);
return 0;
}
$./test
mapsize is 209715200
Bus error (core dumped)
--------------------------------------------------------------------------------
v2: modified the patch's format
Signed-off-by: Zhouping Liu < [email protected] >
---
>From 81b15a0b8a4de0aab5a9b5e720522681b41c70ca Mon Sep 17 00:00:00 2001
From: Zhouping Liu <[email protected]>
Date: Thu, 25 Nov 2010 17:08:54 +0800
Subject: [PATCH] fix a SEGBUS signal error about hugemmap
Signed-off-by: Zhouping Liu <[email protected]>
---
testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c
index 485b465..8ec984b 100644
--- a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c
@@ -174,6 +174,8 @@ main(int ac, char **av)
continue;
} else {
tst_resm(TPASS, "Succeeded mapping file using %d pages",freepages);
+ /* the write function just do initialization */
+ write(fildes, " write some words to the TEMPFILE file\n",40);
/* force to allocate page and change HugePages_Free */
*(int*)addr = 0;
}
--
1.7.2.3
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