Date: Wed, 28 Jan 2009 17:32:27 +0530 From: Channa <channa.kad@gmail.com> To: Harti Brandt <harti@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: Jemalloc SEGV for 1MB chunk Message-ID: <515c64960901280402s529d243fg8b6e0c58dc90b64@mail.gmail.com> In-Reply-To: <20090128124535.M26828@beagle.kn.op.dlr.de> References: <515c64960901280339m17fa9309v2e1bc3f55454ab@mail.gmail.com> <20090128124535.M26828@beagle.kn.op.dlr.de>
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Hi,
Thanks for your reply.
You mean to say i should modify the test as below:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
int i;
char *buf;
size_t size = 1048576 ;
buf = malloc(size);
for (i = 0; i <= 1048575; i++)
buf[i] = 'a';
buf[size]='\0';
printf("The length of buff is : %d\n",strlen(buf));
free(buf);
return 0;
}
I NULL terminated the string
buf[size] = '\0' <== The last character is NULL
But still i get a SEGV at strlen.
Could you please tell me if my changes above are correct?
Regards,
Channa
On 28/01/2009, Harti Brandt <hartmut.brandt@dlr.de> wrote:
> On Wed, 28 Jan 2009, Channa wrote:
>
> C>Hi All,
> C>I am using jemalloc.c source from FreeBSD-current source.
> C>When i allocate 1MB of memory using malloc() and use it as the below
> C>test shows
> C>
> C>#include <stdio.h>
> C>#include <stdlib.h>
> C>#include <string.h>
> C>
> C>int main()
> C>{
> C> int i;
> C> char *buf;
> C> size_t size = 1048576 ;
> C>
> C> buf = malloc(size);
> C> for (i = 0; i < 1048576; i++)
> C> buf[i] = 'a';
> C> printf("The length of buff is : %d\n",strlen(buf));
> C> free(buf);
> C> return 0;
> C>}
> C>
> C>When i try to call strlen(buf) SEGV is recived.
>
> Would be better to terminate the string with a '\0' so that it is really a
> string.
>
> harti
>
> C>
> C>This behaviour is seen when only for 1MB chunk if i allocate
> C>memory lesser than 1MB no issues noticed.
> C>
> C>Could anyone see similar problem?
> C>Is the above test wrong?
> C>Or some issue with huge memory allocation in jemalloc?
> C>
> C>Your response will be very helpful.
> C>
> C>Thanks & Regards,
> C>Channa
> C>_______________________________________________
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> C>http://lists.freebsd.org/mailman/listinfo/freebsd-current
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> C>
> C>
>
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