Date: Fri, 16 Aug 2002 11:52:26 -0700 (PDT) From: Harsha Bellur <hbellur@utstar.com> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/41717: Memory Leak in FreeBSD Message-ID: <200208161852.g7GIqQJe053007@www.freebsd.org>
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>Number: 41717
>Category: misc
>Synopsis: Memory Leak in FreeBSD
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Aug 16 12:00:04 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Harsha Bellur
>Release: ??? Freebsd version used in RTEMS 4.5
>Organization:
>Environment:
RTEMS 4.5
>Description:
|
|
---------- ---------- |
| | | | ETH |
| NODE A | PT-PT LINK | NODE B |----------| 172.16.40.1
| |---------------------- | | |
---------- ---------- |
|
Node A IP : 172.16.17.124 NODE B IP : 172.16.40.122
NODE A adds NODE B's IP as its default gateway
Here's the routing table for NODE B
Destination Gateway/Mask/Hw Flags Refs Use Interface
default 172.16.40.122 UGSW 1744 289 serial0
127.0.0.1/0 127.0.0.1 UHb 0 0 lo0
172.16.17.124/32 127.0.0.1 UH 0 0 lo0
172.16.40.0/24 172.16.40.122 UGW 1 7 serial0
172.16.40.122/32 172.16.17.124 UH 1746 0 serial0
TEST EXECUTED:
.
NODE B is reset every 30-40 seconds. Everytime the PT-PT interface goes down NODE A deletes the
default gateway and the routes associated with it and Adds it when the interface is back up and running
PROBLEM REPORT:
This process of adding and deleting routes is causing memory loss in NODE A
I found out the places in the freebsd code where the memory is allocated but not freed.
(which may be of some help) Memory leak doesnot happen everytime these lines of code
are executed.
1. route.c rtrequest()
makeroute:
R_Malloc(rt, struct rtentry *, sizeof(*rt));
if (rt == 0)
senderr(ENOBUFS);
Bzero(rt, sizeof(*rt));
2. route.c rt_setgate()
if (rt->rt_gateway == 0 || glen > ROUNDUP(rt->rt_gateway->sa_len)) {
old = (caddr_t)rt_key(rt);
R_Malloc(new, caddr_t, dlen + glen);
if (new == 0)
return ENOBUFS;
3. in.c in_control()
case SIOCSIFDSTADDR:
if (p && (error = suser(p)) != 0)
return error;
if (ifp == 0)
return (EADDRNOTAVAIL);
if (ia == (struct in_ifaddr *)0) {
ia = (struct in_ifaddr *)
malloc(sizeof *ia, M_IFADDR, M_WAITOK);
if (ia == (struct in_ifaddr *)NULL)
return (ENOBUFS);
>How-To-Repeat:
NODE B is reset every 30-40 seconds. Everytime the PT-PT interface goes down NODE A deletes the default gateway and the routes associated with it and Adds it when the interface is back up and running
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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