snmpd crash after "response to proxy request illegal. We're screwed"

snmpd (5.6.1) crashes for me quite frequently after logging "response to proxy request illegal.  We're screwed".

Is there anything I can do to debug it further?


There was a similar case back in 2005, with no fix though:

http://groups.google.com/group/mailing.unix.net-snmp-users/browse_thread/thread/2454a5a796fb5814/1e7ebe0455051c7a


This is what happens if I run snmpd in the foreground and I hit this bug:


*** glibc detected *** /usr/sbin/snmpd: double free or corruption (!prev): 0x0000000000899ad0 ***
======= Backtrace: =========
/lib64/libc.so.6[0x39d227230f]
/lib64/libc.so.6(cfree+0x4b)[0x39d227276b]
/usr/lib64/libnetsnmp.so.25[0x7f36c1413886]
/usr/lib64/libnetsnmp.so.25(_sess_read+0x6c5)[0x7f36c1414f45]
/usr/lib64/libnetsnmp.so.25(snmp_sess_read2+0x9)[0x7f36c1415839]
/usr/lib64/libnetsnmp.so.25(snmp_read2+0x23)[0x7f36c14158f3]
/usr/sbin/snmpd(main+0x1d4d)[0x404c8d]
/lib64/libc.so.6(__libc_start_main+0xf4)[0x39d221d994]
/usr/sbin/snmpd[0x402d29]
======= Memory map: ========
00400000-00406000 r-xp 00000000 08:01 4298203                            /usr/sbin/snmpd
00606000-00607000 rw-p 00006000 08:01 4298203                            /usr/sbin/snmpd
00607000-008da000 rw-p 00000000 00:00 0                                  [heap]
39d1e00000-39d1e1c000 r-xp 00000000 08:01 8216955                        /lib64/ld-2.5.so
39d201b000-39d201c000 r--p 0001b000 08:01 8216955                        /lib64/ld-2.5.so
39d201c000-39d201d000 rw-p 0001c000 08:01 8216955                        /lib64/ld-2.5.so
39d2200000-39d234e000 r-xp 00000000 08:01 8216957                        /lib64/libc-2.5.so
39d234e000-39d254d000 ---p 0014e000 08:01 8216957                        /lib64/libc-2.5.so
39d254d000-39d2551000 r--p 0014d000 08:01 8216957                        /lib64/libc-2.5.so
39d2551000-39d2552000 rw-p 00151000 08:01 8216957                        /lib64/libc-2.5.so
39d2552000-39d2557000 rw-p 00000000 00:00 0 
39d2600000-39d2608000 r-xp 00000000 08:01 8216747                        /lib64/libwrap.so.0.7.6
39d2608000-39d2807000 ---p 00008000 08:01 8216747                        /lib64/libwrap.so.0.7.6
39d2807000-39d2809000 rw-p 00007000 08:01 8216747                        /lib64/libwrap.so.0.7.6
39d2a00000-39d2a82000 r-xp 00000000 08:01 8216966                        /lib64/libm-2.5.so
39d2a82000-39d2c81000 ---p 00082000 08:01 8216966                        /lib64/libm-2.5.so
39d2c81000-39d2c82000 r--p 00081000 08:01 8216966                        /lib64/libm-2.5.so
39d2c82000-39d2c83000 rw-p 00082000 08:01 8216966                        /lib64/libm-2.5.so
39d2e00000-39d2e0a000 r-xp 00000000 08:01 4296039                        /usr/lib64/libsysfs.so.2.0.0
39d2e0a000-39d3009000 ---p 0000a000 08:01 4296039                        /usr/lib64/libsysfs.so.2.0.0
39d3009000-39d300a000 rw-p 00009000 08:01 4296039                        /usr/lib64/libsysfs.so.2.0.0
39d3200000-39d3216000 r-xp 00000000 08:01 8217003                        /lib64/libpthread-2.5.so
39d3216000-39d3415000 ---p 00016000 08:01 8217003                        /lib64/libpthread-2.5.so
39d3415000-39d3416000 r--p 00015000 08:01 8217003                        /lib64/libpthread-2.5.so
39d3416000-39d3417000 rw-p 00016000 08:01 8217003                        /lib64/libpthread-2.5.so
39d3417000-39d341b000 rw-p 00000000 00:00 0 
39d3600000-39d363b000 r-xp 00000000 08:01 8217008                        /lib64/libsepol.so.1
39d363b000-39d383b000 ---p 0003b000 08:01 8217008                        /lib64/libsepol.so.1
39d383b000-39d383c000 rw-p 0003b000 08:01 8217008                        /lib64/libsepol.so.1
39d383c000-39d3846000 rw-p 00000000 00:00 0 
39d3a00000-39d3a15000 r-xp 00000000 08:01 8217070                        /lib64/libselinux.so.1
39d3a15000-39d3c15000 ---p 00015000 08:01 8217070                        /lib64/libselinux.so.1
39d3c15000-39d3c17000 rw-p 00015000 08:01 8217070                        /lib64/libselinux.so.1
39d3c17000-39d3c18000 rw-p 00000000 00:00 0 
39d3e00000-39d3e07000 r-xp 00000000 08:01 8217004                        /lib64/librt-2.5.so
39d3e07000-39d4007000 ---p 00007000 08:01 8217004                        /lib64/librt-2.5.so
39d4007000-39d4008000 r--p 00007000 08:01 8217004                        /lib64/librt-2.5.so
39d4008000-39d4009000 rw-p 00008000 08:01 8217004                        /lib64/librt-2.5.so
39d4200000-39d4215000 r-xp 00000000 08:01 8216971                        /lib64/libnsl-2.5.so
39d4215000-39d4414000 ---p 00015000 08:01 8216971                        /lib64/libnsl-2.5.so
39d4414000-39d4415000 r--p 00014000 08:01 8216971                        /lib64/libnsl-2.5.so
39d4415000-39d4416000 rw-p 00015000 08:01 8216971                        /lib64/libnsl-2.5.so
39d4416000-39d4418000 rw-p 00000000 00:00 0 
39d4600000-39d4609000 r-xp 00000000 08:01 8216989                        /lib64/libcrypt-2.5.so
39d4609000-39d4808000 ---p 00009000 08:01 8216989                        /lib64/libcrypt-2.5.so
39d4808000-39d4809000 r--p 00008000 08:01 8216989                        /lib64/libcrypt-2.5.so
39d4809000-39d480a000 rw-p 00009000 08:01 8216989                        /lib64/libcrypt-2.5.so
39d480a000-39d4838000 rw-p 00000000 00:00 0 
39d4a00000-39d4b2d000 r-xp 00000000 08:01 8217072                        /lib64/libcrypto.so.0.9.8e
39d4b2d000-39d4d2c000 ---p 0012d000 08:01 8217072                        /lib64/libcrypto.so.0.9.8e
39d4d2c000-39d4d4d000 rw-p 0012c000 08:01 8217072                        /lib64/libcrypto.so.0.9.8e
39d4d4d000-39d4d51000 rw-p 00000000 00:00 0 
39d4e00000-39d4f2c000 r-xp 00000000 08:01 4420539                        /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so
39d4f2c000-39d512b000 ---p 0012c000 08:01 4420539                        /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so
39d512b000-39d5134000 rw-p 0012b000 08:01 4420539                        /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi/CORE/libperl.so
39d5134000-39d5136000 rw-p 00000000 00:00 0 
39d5200000-39d5211000 r-xp 00000000 08:01 8216976                        /lib64/libresolv-2.5.so
39d5211000-39d5411000 ---p 00011000 08:01 8216976                        /lib64/libresolv-2.5.so
39d5411000-39d5412000 r--p 00011000 08:01 8216976                        /lib64/libresolv-2.5.so
39d5412000-39d5413000 rw-p 00012000 08:01 8216976                        /lib64/libresolv-2.5.so
39d5413000-39d5415000 rw-p 00000000 00:00 0 
39d5600000-39d570f000 r-xp 00000000 08:01 4302501                        /usr/lib64/librpmdb-4.4.soAborted



-- 
Tomasz Chmielewski
http://wpkg.org

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