Hi all, The Net-SNMP daemon crashed with the following error (full backtrace can be found below): Error in `/usr/local/netsnmp/netsnmp_base/sbin/snmpd': malloc(): smallbin double linked list corrupted: 0x000056546e6a9840 We are using Net-SNMP 5.8 built from revision rev2c837e1 of V5-8-patches branch. We have an AgentX subagent connected to the daemon. Unfortunately, we do not know what operation causes the crash. I was wondering if this was a known issue and by any chance already fixed.
Regards, Here is the full backtrace: ======= Backtrace: ========= /lib64/libc.so.6(+0x7f7c4)[0x7fb03e0637c4] /lib64/libc.so.6(+0x82f00)[0x7fb03e066f00] /lib64/libc.so.6(__libc_malloc+0x4c)[0x7fb03e069adc] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35(snmp_clone_mem+0x45)[0x7fb03f3a3e64] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35(+0x1c0fa)[0x7fb03f3a40fa] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35(+0x1c47b)[0x7fb03f3a447b] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35(snmp_clone_pdu+0x2c)[0x7fb03f3a4533] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpagent.so.35(init_agent_snmp_session+0xff)[0x7fb03fc3a983] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpagent.so.35(handle_snmp_packet+0x17a)[0x7fb03fc3c55b] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35(+0x529e8)[0x7fb03f3da9e8] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35(+0x52b80)[0x7fb03f3dab80] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35(_sess_read+0x359)[0x7fb03f3db7ce] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35(snmp_sess_read2+0x32)[0x7fb03f3dc710] /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35(snmp_read2+0x3e)[0x7fb03f3dad8a] /usr/local/netsnmp/netsnmp_base/sbin/snmpd(+0x5084)[0x56546e196084] /usr/local/netsnmp/netsnmp_base/sbin/snmpd(main+0x19b8)[0x56546e1958cc] /lib64/libc.so.6(__libc_start_main+0xf5)[0x7fb03e006505] /usr/local/netsnmp/netsnmp_base/sbin/snmpd(+0x2b99)[0x56546e193b99] ======= Memory map: ======== 56546e191000-56546e198000 r-xp 00000000 fd:01 436216225 /usr/local/netsnmp/5.8.rev2c837e1/sbin/snmpd 56546e397000-56546e398000 r--p 00006000 fd:01 436216225 /usr/local/netsnmp/5.8.rev2c837e1/sbin/snmpd 56546e398000-56546e399000 rw-p 00007000 fd:01 436216225 /usr/local/netsnmp/5.8.rev2c837e1/sbin/snmpd 56546e546000-56546e728000 rw-p 00000000 00:00 0 [heap] 7fb030000000-7fb030021000 rw-p 00000000 00:00 0 7fb030021000-7fb034000000 ---p 00000000 00:00 0 7fb036870000-7fb036885000 r-xp 00000000 fd:01 25580530 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7fb036885000-7fb036a84000 ---p 00015000 fd:01 25580530 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7fb036a84000-7fb036a85000 r--p 00014000 fd:01 25580530 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7fb036a85000-7fb036a86000 rw-p 00015000 fd:01 25580530 /usr/lib64/libgcc_s-4.8.5-20150702.so.1 7fb036a86000-7fb036a8e000 r-xp 00000000 fd:01 25563045 /usr/lib64/libnss_sss.so.2 7fb036a8e000-7fb036c8d000 ---p 00008000 fd:01 25563045 /usr/lib64/libnss_sss.so.2 7fb036c8d000-7fb036c8e000 r--p 00007000 fd:01 25563045 /usr/lib64/libnss_sss.so.2 7fb036c8e000-7fb036c8f000 rw-p 00008000 fd:01 25563045 /usr/lib64/libnss_sss.so.2 7fb036c8f000-7fb036c9b000 r-xp 00000000 fd:01 25202145 /usr/lib64/libnss_files-2.17.so 7fb036c9b000-7fb036e9a000 ---p 0000c000 fd:01 25202145 /usr/lib64/libnss_files-2.17.so 7fb036e9a000-7fb036e9b000 r--p 0000b000 fd:01 25202145 /usr/lib64/libnss_files-2.17.so 7fb036e9b000-7fb036e9c000 rw-p 0000c000 fd:01 25202145 /usr/lib64/libnss_files-2.17.so 7fb036e9c000-7fb036ea2000 rw-p 00000000 00:00 0 7fb036ea2000-7fb03d3cc000 r--p 00000000 fd:01 16912899 /usr/lib/locale/locale-archive 7fb03d3cc000-7fb03d3ce000 r-xp 00000000 fd:01 25202123 /usr/lib64/libfreebl3.so 7fb03d3ce000-7fb03d5cd000 ---p 00002000 fd:01 25202123 /usr/lib64/libfreebl3.so 7fb03d5cd000-7fb03d5ce000 r--p 00001000 fd:01 25202123 /usr/lib64/libfreebl3.so 7fb03d5ce000-7fb03d5cf000 rw-p 00002000 fd:01 25202123 /usr/lib64/libfreebl3.so 7fb03d5cf000-7fb03d6d0000 r-xp 00000000 fd:01 26513274 /usr/lib64/libm-2.17.so 7fb03d6d0000-7fb03d8cf000 ---p 00101000 fd:01 26513274 /usr/lib64/libm-2.17.so 7fb03d8cf000-7fb03d8d0000 r--p 00100000 fd:01 26513274 /usr/lib64/libm-2.17.so 7fb03d8d0000-7fb03d8d1000 rw-p 00101000 fd:01 26513274 /usr/lib64/libm-2.17.so 7fb03d8d1000-7fb03dbac000 r-xp 00000000 fd:01 67332135 /usr/local/ssl/1.0.2s/lib/libcrypto.so.1.0.0 7fb03dbac000-7fb03ddab000 ---p 002db000 fd:01 67332135 /usr/local/ssl/1.0.2s/lib/libcrypto.so.1.0.0 7fb03ddab000-7fb03ddca000 r--p 002da000 fd:01 67332135 /usr/local/ssl/1.0.2s/lib/libcrypto.so.1.0.0 7fb03ddca000-7fb03ddd8000 rw-p 002f9000 fd:01 67332135 /usr/local/ssl/1.0.2s/lib/libcrypto.so.1.0.0 7fb03ddd8000-7fb03dddc000 rw-p 00000000 00:00 0 7fb03dddc000-7fb03dde3000 r-xp 00000000 fd:01 25202160 /usr/lib64/librt-2.17.so 7fb03dde3000-7fb03dfe2000 ---p 00007000 fd:01 25202160 /usr/lib64/librt-2.17.so 7fb03dfe2000-7fb03dfe3000 r--p 00006000 fd:01 25202160 /usr/lib64/librt-2.17.so 7fb03dfe3000-7fb03dfe4000 rw-p 00007000 fd:01 25202160 /usr/lib64/librt-2.17.so 7fb03dfe4000-7fb03e1a7000 r-xp 00000000 fd:01 25202132 /usr/lib64/libc-2.17.so 7fb03e1a7000-7fb03e3a7000 ---p 001c3000 fd:01 25202132 /usr/lib64/libc-2.17.so 7fb03e3a7000-7fb03e3ab000 r--p 001c3000 fd:01 25202132 /usr/lib64/libc-2.17.so 7fb03e3ab000-7fb03e3ad000 rw-p 001c7000 fd:01 25202132 /usr/lib64/libc-2.17.so 7fb03e3ad000-7fb03e3b2000 rw-p 00000000 00:00 0 7fb03e3b2000-7fb03e3b4000 r-xp 00000000 fd:01 25202166 /usr/lib64/libutil-2.17.so 7fb03e3b4000-7fb03e5b3000 ---p 00002000 fd:01 25202166 /usr/lib64/libutil-2.17.so 7fb03e5b3000-7fb03e5b4000 r--p 00001000 fd:01 25202166 /usr/lib64/libutil-2.17.so 7fb03e5b4000-7fb03e5b5000 rw-p 00002000 fd:01 25202166 /usr/lib64/libutil-2.17.so 7fb03e5b5000-7fb03e5bd000 r-xp 00000000 fd:01 25202136 /usr/lib64/libcrypt-2.17.so 7fb03e5bd000-7fb03e7bc000 ---p 00008000 fd:01 25202136 /usr/lib64/libcrypt-2.17.so 7fb03e7bc000-7fb03e7bd000 r--p 00007000 fd:01 25202136 /usr/lib64/libcrypt-2.17.so 7fb03e7bd000-7fb03e7be000 rw-p 00008000 fd:01 25202136 /usr/lib64/libcrypt-2.17.so 7fb03e7be000-7fb03e7ec000 rw-p 00000000 00:00 0 7fb03e7ec000-7fb03e7ee000 r-xp 00000000 fd:01 26513272 /usr/lib64/libdl-2.17.so 7fb03e7ee000-7fb03e9ee000 ---p 00002000 fd:01 26513272 /usr/lib64/libdl-2.17.so 7fb03e9ee000-7fb03e9ef000 r--p 00002000 fd:01 26513272 /usr/lib64/libdl-2.17.so 7fb03e9ef000-7fb03e9f0000 rw-p 00003000 fd:01 26513272 /usr/lib64/libdl-2.17.so 7fb03e9f0000-7fb03ea06000 r-xp 00000000 fd:01 26513276 /usr/lib64/libnsl-2.17.so 7fb03ea06000-7fb03ec06000 ---p 00016000 fd:01 26513276 /usr/lib64/libnsl-2.17.so 7fb03ec06000-7fb03ec07000 r--p 00016000 fd:01 26513276 /usr/lib64/libnsl-2.17.so 7fb03ec07000-7fb03ec08000 rw-p 00017000 fd:01 26513276 /usr/lib64/libnsl-2.17.so 7fb03ec08000-7fb03ec0a000 rw-p 00000000 00:00 0 7fb03ec0a000-7fb03ec21000 r-xp 00000000 fd:01 25202155 /usr/lib64/libpthread-2.17.so 7fb03ec21000-7fb03ee20000 ---p 00017000 fd:01 25202155 /usr/lib64/libpthread-2.17.so 7fb03ee20000-7fb03ee21000 r--p 00016000 fd:01 25202155 /usr/lib64/libpthread-2.17.so 7fb03ee21000-7fb03ee22000 rw-p 00017000 fd:01 25202155 /usr/lib64/libpthread-2.17.so 7fb03ee22000-7fb03ee26000 rw-p 00000000 00:00 0 7fb03ee26000-7fb03f16f000 r-xp 00000000 fd:01 595625836 /usr/local/perl/5.30.0/lib/5.30.0/x86_64-linux-thread-multi/CORE/libperl.so 7fb03f16f000-7fb03f36f000 ---p 00349000 fd:01 595625836 /usr/local/perl/5.30.0/lib/5.30.0/x86_64-linux-thread-multi/CORE/libperl.so 7fb03f36f000-7fb03f382000 rw-p 00349000 fd:01 595625836 /usr/local/perl/5.30.0/lib/5.30.0/x86_64-linux-thread-multi/CORE/libperl.so 7fb03f382000-7fb03f388000 rw-p 00000000 00:00 0 7fb03f388000-7fb03f463000 r-xp 00000000 fd:01 419810009 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35.0.1 7fb03f463000-7fb03f662000 ---p 000db000 fd:01 419810009 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35.0.1 7fb03f662000-7fb03f665000 r--p 000da000 fd:01 419810009 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35.0.1 7fb03f665000-7fb03f668000 rw-p 000dd000 fd:01 419810009 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmp.so.35.0.1 7fb03f668000-7fb03f72e000 rw-p 00000000 00:00 0 7fb03f72e000-7fb03f8b3000 r-xp 00000000 fd:01 419842655 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpmibs.so.35.0.1 7fb03f8b3000-7fb03fab3000 ---p 00185000 fd:01 419842655 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpmibs.so.35.0.1 7fb03fab3000-7fb03fab8000 r--p 00185000 fd:01 419842655 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpmibs.so.35.0.1 7fb03fab8000-7fb03fabd000 rw-p 0018a000 fd:01 419842655 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpmibs.so.35.0.1 7fb03fabd000-7fb03fbf6000 rw-p 00000000 00:00 0 7fb03fbf6000-7fb03fc71000 r-xp 00000000 fd:01 419809984 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpagent.so.35.0.1 7fb03fc71000-7fb03fe70000 ---p 0007b000 fd:01 419809984 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpagent.so.35.0.1 7fb03fe70000-7fb03fe72000 r--p 0007a000 fd:01 419809984 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpagent.so.35.0.1 7fb03fe72000-7fb03fe73000 rw-p 0007c000 fd:01 419809984 /usr/local/netsnmp/5.8.rev2c837e1/lib/libnetsnmpagent.so.35.0.1 7fb03fe73000-7fb03fe95000 r-xp 00000000 fd:01 25167252 /usr/lib64/ld-2.17.so 7fb04007f000-7fb040086000 rw-p 00000000 00:00 0 7fb040091000-7fb040094000 rw-p 00000000 00:00 0 7fb040094000-7fb040095000 r--p 00021000 fd:01 25167252 /usr/lib64/ld-2.17.so 7fb040095000-7fb040096000 rw-p 00022000 fd:01 25167252 /usr/lib64/ld-2.17.so 7fb040096000-7fb040097000 rw-p 00000000 00:00 0 7ffc1dab3000-7ffc1db06000 rw-p 00000000 00:00 0 [stack] 7ffc1db6d000-7ffc1db6f000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall] [http://www.cisco.com/c/dam/m/en_us/signaturetool/images/banners/standard/09_standard_graphic.png] David Moriconi Software Engineer dmori...@cisco.com<mailto:dmori...@cisco.com> Tel: 5143333808 Cisco Systems Canada Co. / Les Systemes Cisco Canada CIE Cisco.com<http://www.cisco.com/web/CA/> [http://www.cisco.com/assets/swa/img/thinkbeforeyouprint.gif] Think before you print. 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