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and subject line Bug#162584: memory leak in gethostbyname_r
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Subject: memory leak in gethostbyname_r
From: "Joern Heissler" <[EMAIL PROTECTED]>
To: "Debian Bug Tracking System" <[EMAIL PROTECTED]>
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Date: Fri, 27 Sep 2002 14:33:38 +0200
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Package: libc6
Version: 2.2.5-14.3
Severity: normal
-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux server 2.2.20 #5 Mon Jul 8 21:10:05 CEST 2002 i686
Locale: LANG=C, [EMAIL PROTECTED]
Versions of packages libc6 depends on:
ii libdb1-compat 2.1.3-4 The Berkeley database routines [gl
-- no debconf information
I think I've found a memory leak in the function `gethostbyname_r'.
Example code:
#define _GNU_SOURCE
#include <netdb.h>
#include <pthread.h>
void *lookup(void *arg)
{
char buf[8192];
struct hostent ret,*res;
int err;
gethostbyname_r((char *)arg, &ret, buf, 8192, &res, &err);
return NULL;
}
int main(void)
{
pthread_t tid;
do {
pthread_create(&tid, NULL, lookup, (void *) "www.debian.org");
} while (!pthread_join(tid, NULL));
return 0;
}
I compile the code like this:
gcc -Wall -O2 -o bug bug.c -lpthread
I've found 3 ways to avoid the memory leak in this code:
- compile it with -static
- comment out gethostbyname_r()
- don't create a new thread before calling gethostbyname_r() ->
for(;;) lookup("www.debian.org");
Every thread can leak memory only once, afaics.
Using dynamically allocated memory for `buf' and `ret' doesn't change
anything.
Regards
Joern Heissler
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Date: Sat, 17 Jul 2004 18:27:28 +0900
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From: GOTO Masanori <[EMAIL PROTECTED]>
To: "Joern Heissler" <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
Subject: Re: Bug#162584: memory leak in gethostbyname_r
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Hi,
At Fri, 27 Sep 2002 14:33:38 +0200,
Joern Heissler wrote:
> Package: libc6
> Version: 2.2.5-14.3
> Severity: normal
> I think I've found a memory leak in the function `gethostbyname_r'.
>
> Example code:
>
> #define _GNU_SOURCE
> #include <netdb.h>
> #include <pthread.h>
>
> void *lookup(void *arg)
> {
> char buf[8192];
> struct hostent ret,*res;
> int err;
>
> gethostbyname_r((char *)arg, &ret, buf, 8192, &res, &err);
>
> return NULL;
> }
>
> int main(void)
> {
> pthread_t tid;
>
> do {
> pthread_create(&tid, NULL, lookup, (void *) "www.debian.org");
> } while (!pthread_join(tid, NULL));
>
> return 0;
> }
>
> I compile the code like this:
> gcc -Wall -O2 -o bug bug.c -lpthread
>
> I've found 3 ways to avoid the memory leak in this code:
> - compile it with -static
> - comment out gethostbyname_r()
> - don't create a new thread before calling gethostbyname_r() ->
> for(;;) lookup("www.debian.org");
>
> Every thread can leak memory only once, afaics.
>
> Using dynamically allocated memory for `buf' and `ret' doesn't change
> anything.
Thanks for your report. In glibc 2.3.2.ds1-13, I confirmed this bug
was fixed with both nptl and linuxthreads. I close this bug.
Regards,
-- gotom
