SNMP Daemon crashed on sending SIGHUP signal by deleting trap2sink entry from configuration file.

Net-snmp version 5.2.1

 

Platform details.

SNMP master agent is running on a switch which is having "MontaVista
6.0-8.0.7.0300532 2003-12-24" operating system.

 

Steps to reproduce the crash as follows,

 

1. Configurations file should contain the following entries, (order
should be same)

master agentx

agentxSocket localhost:705

agentaddress 161

trap2sink 192.168.33.2 public

2. Start master agent

3. Remove the trap2sink entry from configuration file.

            Modified configuration file content looks like this,

            master agentx

agentxSocket localhost:705

agentaddress 161

 

4. Send SIGHUP to master agent

            Now snmp daemon will crash. Crash is consistent only with
the above procedure. Here is the gdb trace,

 

 

root@nexthop:/nh/bin# gdb -d .. master_agent

GNU gdb 6.0 (MontaVista 6.0-8.0.7.0300532 2003-12-24)

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This GDB was configured as "powerpc-hardhat-linux"...at

(gdb) att 351

Attaching to program: /nh/bin/master_agent, process 351

Reading symbols from /lib/libm.so.6...done.

Loaded symbols for /lib/libm.so.6

Reading symbols from /lib/libresolv.so.2...done.

Loaded symbols for /lib/libresolv.so.2

Reading symbols from /lib/libcrypt.so.1...done.

Loaded symbols for /lib/libcrypt.so.1

Reading symbols from /usr/lib/libelf.so.0...done.

Loaded symbols for /usr/lib/libelf.so.0

Reading symbols from /lib/librt.so.1...done.

Loaded symbols for /lib/librt.so.1

Reading symbols from /lib/libc.so.6...done.

Loaded symbols for /lib/libc.so.6

Reading symbols from /lib/libpthread.so.0...done.

Loaded symbols for /lib/libpthread.so.0

Reading symbols from /lib/ld.so.1...done.

Loaded symbols for /lib/ld.so.1

Reading symbols from /lib/libnss_files.so.2...done.

Loaded symbols for /lib/libnss_files.so.2

0x0fe02fac in select () from /lib/libc.so.6

(gdb) c

Continuing.

 

Program received signal SIGHUP, Hangup.

0x0fe02fac in select () from /lib/libc.so.6

(gdb) c

Continuing.

 

Program received signal SIGSEGV, Segmentation fault.

snmp_sess_select_info (sessp=0x10083490, numfds=0x7ffffc40,
fdset=0x7ffffab8,

    timeout=0x7ffffc38, block=0x7ffffc44)

    at gated/src/snmp/libs/snmplib/snmp_api.c:5714

5714            if (slp->transport->sock == -1) {

(gdb)