[ns] Runtime Error: glibc detected, ns: realloc(): invalid next size:0x09150380
Hi all, I have recently implemented a new protocol in NS2. The new protocol is based on the OLSR routing protocol, which runs correctly in NS2 before any modification. The compilation was successful, but when I tried to run NS2, I got the following error messages: *** glibc detected *** ns: realloc(): invalid next size: 0x09150380 *** === Backtrace: = /lib/libc.so.6[0x696efd] /lib/libc.so.6(realloc+0x19d)[0x698ebd] ns(TclpRealloc+0x24)[0x8496b64] ns(Tcl_Realloc+0x2c)[0x8421fbc] ns(Tcl_SetObjLength+0x7a)[0x8477f5a] ns(TclpNativeJoinPath+0xa8)[0x844d828] ns(Tcl_FSJoinPath+0x368)[0x845ffa8] ns(Tcl_JoinPath+0x68)[0x844d5d8] ns(TclpInitLibraryPath+0x5d7)[0x848b7a7] ns[0x843eaf0] ns(Tcl_FindExecutable+0x91)[0x843ec41] ns(Tcl_Main+0x2b)[0x84663fb] ns(nslibmain+0x20)[0x840f6d2] ns(main+0x22)[0x840f72e] /lib/libc.so.6(__libc_start_main+0xdc)[0x641e8c] ns(__gxx_personality_v0+0x331)[0x81abb41] === Memory map: 00497000-004a2000 r-xp fd:00 1967695 /lib/libgcc_s-4.1.2-20080825.so.1 004a2000-004a3000 rwxp a000 fd:00 1967695 /lib/libgcc_s-4.1.2-20080825.so.1 005e9000-005ea000 r-xp 005e9000 00:00 0 [vdso] 0060e000-00628000 r-xp fd:00 1967671/lib/ld-2.5.so 00628000-00629000 r-xp 00019000 fd:00 1967671/lib/ld-2.5.so 00629000-0062a000 rwxp 0001a000 fd:00 1967671/lib/ld-2.5.so 0062c000-0076a000 r-xp fd:00 1967672/lib/libc-2.5.so 0076a000-0076c000 r-xp 0013e000 fd:00 1967672/lib/libc-2.5.so 0076c000-0076d000 rwxp 0014 fd:00 1967672/lib/libc-2.5.so 0076d000-0077 rwxp 0076d000 00:00 0 00772000-00797000 r-xp fd:00 1967679/lib/libm-2.5.so .. .. .. // // // // I have googled the problem, it seems to be a matter of memory management. However, I did not use the realloc() function when programming. Except that I implemented some containers like vector, map, and map of maps, map of vectors. Could this caused by these containers? Like when one tries to allocate new container, or delete elements from containers. I am trying to find any possible logical bugs in my program, but this is really urgent. Any help will be appreciated. Edward.
[ns] Problem sending a MAC layer broadcast
hi,
I am trying to send a MAC broadcast message in response to having overheard
something. So I create and send a packet as follows (inside recvDATA before
address filtering):
Packet* report_pkt =
Packet::alloc();
hdr_ip* iph_report =
hdr_ip::access(report_pkt);
hdr_cmn* ch_report =
hdr_cmn::access(report_pkt);
hdr_wd* wd_report =
hdr_wd::access(report_pkt);
ch_report-direction() =
hdr_cmn::DOWN;
ch_report-next_hop() =
IP_BROADCAST;
ch_report-addr_type() =
NS_AF_INET;
ch_report-ptype() = PT_MAC;
//method to set address
iph_report-saddr() =
Address::instance().create_ipaddr(NodeId,RT_PORT);
iph_report-daddr() =
IP_BROADCAST;
iph_report-sport() =
RT_PORT;
iph_report-dport() =
RT_PORT;
iph_report-ttl() =
IP_DEF_TTL;
hdr_mac *mh_report =
HDR_MAC(report_pkt);
wd_report-is_bad_ = 1;
wd_report-watchdog_id_ =
NodeId;
wd_report-watched_id_ =
sorc;
send(report_pkt,0);
Then I put the following check in recvDATA:
if(dst == MAC_BROADCAST) {
if(ch-direction()==hdr_cmn::UP)
if ( wd-BadCheck()==1 )
printf(In broadcast I am
node %d and I heard a badness report for %d from ip src%d %d bad report %d
dst is %d \n, netif_-node()-nodeid(), wd-WatchedID(), ssriph-saddr(),
wd-WDID(), wd-BadCheck(), ssriph-daddr());
}
The problem is, only node 0 is receiving these messages. No other node
receives this message. Can anyone please give any suggestions, I have been
stuck here for a week now. Should I put this functionality somewhere else
maybe?
thanks
[ns] Is it possible to set a specific response delay for a node?
Dear NS users, I am new to Network Simulator and don't know much about it's capabilities, so as the first question i wanted to ask if this software can help me with my project or not.I have to simulate a communication between 2 computers that use TCP as the communication protocol.one of these computers is very fast in processing network packets but the other one is so slow and can not keep up with the first one, for example can not send ACK packets in response to packets that it receives from the first computer in a time that the first computer expects to receive an ACK for each of its corresponding packet. Actually I want to set a specific delay for the second computer to answer the first computer packets. Would I be able to simulate such a scenario in NS? if yes, which version of NS is better to use? Thanks in advance, Mobin
[ns] calculate bandwidth!!!!!!!
Dear all I am new in Ns-2 and I have a little question. I this page http://www.isi.edu/nsnam/ns/tutorial/index.html, are written: When you start the script now with 'ns example2.tcl', you will notice that there is more traffic on the links from n0 to n2 and n1 to n2 than the link from n2 to n3 can carry. A simple calculation confirms this: We are sending 200 packets per second on each of the first two links and the packet size is 500 bytes. This results in a bandwidth of 0.8 megabits per second for the links from n0 to n2 and from n1 to n2 How you calculate the 0.8 megabits??? why .08? could you help me please?? -- Regards; Hosseini Nazhad.
[ns] Little question about SIFS_Waiting state in 802.11Etx in ns2.34
Hi, all I encountered a little question about SIFS_Waiting state in802.11 DCF , while attemting to learn and extending the 802.11Ext implementation for NS2.34. When a node(A) receives a RTS frame, it will responds an CTS_1 after aSIFStime if these no NAV, which means it is going to receive DATA . Is it possible that the node (A) transmit another frame during the SIFS? During SIFS, the Backoff, channel state and NAC may all report OK to transmit. If another frame(F2) is transmit by MAC after its SIFS, the PHY is very likely still in Transmittin state for the first CTS_1, which seems like an error for PHY. The reason I notice this question is, that I am desining an reliable multicast_MAC extention for 802.11, which demands the intended receivers to respends CTS sequentially . So some receivers will wait longger time before transmitting CTS, and during this waiting time, any other transmission is not allowed logically. I use NAV to acheive this purpose, i.e. set NAV = wait_time. Any help will be appriciated. Regards, -Kara-
[ns] Average Path Length code for AODV and node used from source to destination
Hi, If anyone has a code on how to calculate the average path length for AODV protocl, will be greatful if you can provide it here. My second question is how to know what hops the route taken from source to destination... Tq in advance
