/The agentx_got_response method handles responses from an agentx sub-agent. Are you running a sub-agent? If so, shut that down before bringing up the wifi and see what happens. If not, comment out the "master agentx" line in snmp.conf and see what happens./
/It would be nice if one of the devs could jump in. I have two unanswered posts in the last week or so. / On 09-Jul-2020 4:20 PM, Himanshu Sharma wrote: > Hi John, > > Before the crash occurs ,I can see the following error message from > the snmpd log. > *Unknown operation 6 in agentx_got_response.* > *Have you seen anything like this before?* > > This comes from the file : > net-snmp-5.8/agent/mibgroup/agentx/master.c > /snmp_log(LOG_ERR, "Unknown operation %d in agentx_got_response\n", > operation); > netsnmp_free_delegated_cache(cache); > return 0;/ > / > / > Regards > Himanshu > > On Thu, Jul 9, 2020 at 5:31 AM John Bize <jb...@godswind.org > <mailto:jb...@godswind.org>> wrote: > > Himanshu, > > I haven't looked at that part of the code, but I wouldn't expect > snmpd to dynamically handle changing interfaces. The only thing I > could suggest is to stop the service while initializing the wifi, > and restarting it when wifi is up. When it starts, it should find > all interfaces, unless you've changed that in the configuration. > > John > > On 08-Jul-2020 5:53 PM, Himanshu Sharma wrote: >> Hi John, >> >> My system has two interfaces one for Ethernet eth0 and the other >> for wifi wlan0..but the problem is when system bootup >> (Ethernet)eth0 Acquires ip address using dhcp..I can successful >> do snmp operation using the ip address of the ethernet..Problem >> is the moment I connect wifi(wlan0) to a wifi router ..the wlan0 >> interface acquires ip address, and snmpd crashes. >> >> -Himanshu >> >> >> On Thu, Jul 9, 2020, 02:50 Himanshu Sharma >> <himanshusharma1...@gmail.com >> <mailto:himanshusharma1...@gmail.com>> wrote: >> >> Hi John, >> >> Thanks for prompt reply. >> I am using net-snmp version 5.8. >> I want SNMP to serve on both ethernet and wifi.When my system >> bootup Ethernet eth0 in my case will acquire ip address using >> dhcp immediately..At this moment my snmpd is already up. >> Now, at some point later..I will connect my system to wifi >> router(wlan0) and interface acquires IP address ,but snmpd >> crashes immediately and backtrace change everytime.. >> Is this a valid scenario? I thought snmpd can support mutiple >> interfaces at them same time.. >> >> Thank & Regards >> Himanshu. >> >> -Himanshu >> >> On Thu, Jul 9, 2020, 02:35 John Bize <jb...@godswind.org >> <mailto:jb...@godswind.org>> wrote: >> >> Himanshu, >> >> I don't know what type of system you are using, but I'm >> guessing that without predictive interface names it might >> be very old. >> >> I don't know what you are trying to accomplish. Do you >> want to serve SNMP on both the WiFi and Ethernet >> interfaces? If so, you may need to hold off starting >> snmpd until the interfaces are up and your WiFi is >> connected. I wouldn't excpect snmpd to dynamically >> handle changing interfaces. If you only want to serve it >> on the Ethernet interface ans it is statically >> configured, then specify that IP with the "agentAddress" >> configuration directive. >> >> I am using DHCP on one interface of a dual-interface >> system. It is Debian Linux 10. To prevent the snmpd >> from starting until after the interfaces are up and >> configured, my snmpd Unit file (snmpd.service) looks like >> this: >> >> [Unit] >> Description=Simple Network Management Protocol (SNMP) >> Daemon. >> After=network.target >> # Wait for network interfaces to be all the way up >> (incl. DHCP) >> After=systemd-networkd-wait-online.service >> Wants=systemd-networkd-wait-online.service >> ConditionPathExists=/etc/snmp/snmpd.conf >> >> >> [Service] >> >> Environment="MIBSDIR=/usr/share/snmp/mibs:/usr/share/snmp/mibs/iana:/usr/share/snmp/mibs/ietf:/usr/share/mibs/site:/usr/share/snmp/mibs:/usr/share/mibs/iana:/usr/share/mibs/ietf:/usr/share/mibs/netsnmp" >> Environment="MIBS=" >> Type=simple >> ExecStart=/usr/sbin/snmpd -a -Lsd -Lf >> /var/log/snmpd.log -u Debian-snmp -g Debian-snmp -I >> -smux,mteTrigger,mteTriggerConf -f -p /run/snmpd.pid >> ExecReload=/bin/kill -HUP $MAINPID >> >> [Install] >> WantedBy=multi-user.target >> >> If none of this helps, please add more information about >> your system, snmpd version, and what you are trying to do. >> >> John >> >> >> On 08-Jul-2020 4:42 PM, Himanshu Sharma wrote: >>> +Bill and Larry >>> >>> -Himanshu >>> >>> On Thu, Jul 9, 2020 at 2:02 AM Himanshu Sharma >>> <himanshusharma1...@gmail.com >>> <mailto:himanshusharma1...@gmail.com>> wrote: >>> >>> Hi All, >>> >>> I am facing a very weird issue. >>> I have 2 interfaces on my system. >>> *The moment the wlan0 acquires the ip address snmpd >>> crashes.* >>> If there is only one interface let say *eth0*.,snmpd >>> works fine. >>> One more problem is *coredump* analysis of >>> crash using gdb, shows different backtrace everytime. >>> I am attaching the back trace for reference..Also >>> the ifconfig of my local system. >>> It would be great if anyone can help me.. I am not >>> able to find any solution 😞 >>> >>> -Himanshu >>> >>> >>> *#0 __libc_do_syscall () at >>> ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:47 >>> #1 0xb6d6d1b2 in __libc_signal_restore_set >>> (set=0xbeb7b320) at >>> ../sysdeps/unix/sysv/linux/nptl-signals.h:79 >>> #2 __GI_raise (sig=sig@entry=6) at >>> ../sysdeps/unix/sysv/linux/raise.c:48 >>> #3 0xb6d6de3a in __GI_abort () at abort.c:89 >>> #4 0xb6d947da in __libc_message >>> (do_abort=do_abort@entry=2, fmt=<optimized out>) at >>> ../sysdeps/posix/libc_fatal.c:175 >>> #5 0xb6d98b28 in malloc_printerr (action=<optimized >>> out>, str=0xb6e14de4 "corrupted double-linked list", >>> ptr=<optimized out>, ar_ptr=<optimized out>) at >>> malloc.c:5087 >>> #6 0xb6d9b0d4 in _int_malloc >>> (av=av@entry=0xb6e317a4 <main_arena>, >>> bytes=bytes@entry=12) at malloc.c:3743 >>> #7 0xb6d9c556 in __libc_calloc (n=<optimized out>, >>> elem_size=<optimized out>) at malloc.c:3246 >>> #8 0xb6ecbcb8 in init_agent_snmp_session >>> (session=0x1dceac0, pdu=<optimized out>) at >>> snmp_agent.c:1587 >>> #9 0xb6ecd368 in handle_snmp_packet >>> (session=<optimized out>, pdu=<optimized out>, >>> magic=0x0, reqid=<optimized out>, op=<optimized >>> out>) at snmp_agent.c:2227 >>> #10 0xb6e503e4 in _sess_process_packet_handle_pdu >>> (isp=0x1dcea78, isp=0x1dcea78, transport=0x1dce888, >>> pdu=0x1dd68e0, sp=0x1dceac0, sessp=<optimized out>) >>> at snmp_api.c:5807 >>> #11 _sess_process_packet >>> (sessp=sessp@entry=0x1dcea60, sp=sp@entry=0x1dceac0, >>> isp=0x1dcea78, transport=transport@entry=0x1dce888, >>> opaque=opaque@entry=0x1dd4b18, >>> olength=olength@entry=60, >>> packetptr=0x1de5060 "0M\002\001", length=79) at >>> snmp_api.c:5863 >>> #12 0xb6e50a3a in _sess_read >>> (sessp=sessp@entry=0x1dcea60, >>> fdset=fdset@entry=0xbeb7b9a0) at snmp_api.c:6124 >>> #13 0xb6e50b14 in snmp_sess_read2 >>> (sessp=sessp@entry=0x1dcea60, >>> fdset=fdset@entry=0xbeb7b9a0) at snmp_api.c:6397 >>> #14 0xb6e50b44 in snmp_read2 >>> (fdset=fdset@entry=0xbeb7b9a0) at snmp_api.c:5912 >>> #15 0x00012c0c in receive () at snmpd.c:1342 >>> #16 0x000126a4 in main (argc=<optimized out>, >>> argv=<optimized out>) at snmpd.c:1125 >>> * >>> >>> * >>> #1 0xb6d6d1b2 in __libc_signal_restore_set >>> (set=0xbeb7b320) at >>> ../sysdeps/unix/sysv/linux/nptl-signals.h:79 >>> #2 __GI_raise (sig=sig@entry=6) at >>> ../sysdeps/unix/sysv/linux/raise.c:48 >>> #3 0xb6d6de3a in __GI_abort () at abort.c:89 >>> #4 0xb6d947da in __libc_message >>> (do_abort=do_abort@entry=2, fmt=<optimized out>) at >>> ../sysdeps/posix/libc_fatal.c:175 >>> #5 0xb6d98b28 in malloc_printerr (action=<optimized >>> out>, str=0xb6e14de4 "corrupted double-linked list", >>> ptr=<optimized out>, ar_ptr=<optimized out>) at >>> malloc.c:5087 >>> #6 0xb6d9b0d4 in _int_malloc >>> (av=av@entry=0xb6e317a4 <main_arena>, >>> bytes=bytes@entry=12) at malloc.c:3743 >>> #7 0xb6d9c556 in __libc_calloc (n=<optimized out>, >>> elem_size=<optimized out>) at malloc.c:3246 >>> #8 0xb6ecbcb8 in init_agent_snmp_session >>> (session=0x1dceac0, pdu=<optimized out>) at >>> snmp_agent.c:1587 >>> #9 0xb6ecd368 in handle_snmp_packet >>> (session=<optimized out>, pdu=<optimized out>, >>> magic=0x0, reqid=<optimized out>, op=<optimized >>> out>) at snmp_agent.c:2227 >>> #10 0xb6e503e4 in _sess_process_packet_handle_pdu >>> (isp=0x1dcea78, isp=0x1dcea78, transport=0x1dce888, >>> pdu=0x1dd68e0, sp=0x1dceac0, sessp=<optimized out>) >>> at snmp_api.c:5807 >>> #11 _sess_process_packet >>> (sessp=sessp@entry=0x1dcea60, sp=sp@entry=0x1dceac0, >>> isp=0x1dcea78, transport=transport@entry=0x1dce888, >>> opaque=opaque@entry=0x1dd4b18, >>> olength=olength@entry=60, >>> packetptr=0x1de5060 "0M\002\001", length=79) at >>> snmp_api.c:5863 >>> #12 0xb6e50a3a in _sess_read >>> (sessp=sessp@entry=0x1dcea60, >>> fdset=fdset@entry=0xbeb7b9a0) at snmp_api.c:6124 >>> #13 0xb6e50b14 in snmp_sess_read2 >>> (sessp=sessp@entry=0x1dcea60, >>> fdset=fdset@entry=0xbeb7b9a0) at snmp_api.c:6397 >>> #14 0xb6e50b44 in snmp_read2 (fdset=0xbeb7b9a0) at >>> snmp_api.c:5912* >>> >>> * >>> #1 0xb6dc21b2 in __libc_signal_restore_set >>> (set=0xbec483a8) at >>> ../sysdeps/unix/sysv/linux/nptl-signals.h:79 >>> #2 __GI_raise (sig=sig@entry=6) at >>> ../sysdeps/unix/sysv/linux/raise.c:48 >>> #3 0xb6dc2e3a in __GI_abort () at abort.c:89 >>> #4 0xb6ded850 in __malloc_assert >>> (assertion=<optimized out>, file=<optimized out>, >>> line=3068686472, line@entry=3738, >>> function=0xb6e6ab44 <__func__.15585> "_int_malloc") >>> at malloc.c:296 >>> #5 0xb6df02c6 in _int_malloc (av=0x2, >>> av@entry=0xb6e867a4 <main_arena>, >>> bytes=bytes@entry=24) at malloc.c:3738 >>> #6 0xb6df1556 in __libc_calloc (n=<optimized out>, >>> elem_size=<optimized out>) at malloc.c:3246 >>> #7 0xb6f1b5d2 in netsnmp_create_delegated_cache >>> (handler=handler@entry=0xecf440, >>> reginfo=reginfo@entry=0xecf6f8, >>> reqinfo=reqinfo@entry=0xed57f8, >>> requests=requests@entry=0xed6e60, >>> localinfo=localinfo@entry=0xeba978) at >>> agent_handler.c:881 >>> #8 0xb6f232d4 in agentx_master_handler >>> (handler=0xecf440, reginfo=0xecf6f8, >>> reqinfo=0xed57f8, requests=0xed6e60) at >>> mibgroup/agentx/master.c:610 >>> #9 0xb6f1b16c in netsnmp_call_handler >>> (requests=0xed6e60, reqinfo=0xed57f8, >>> reginfo=0xecf6f8, next_handler=0xecf440) at >>> agent_handler.c:546 >>> #10 netsnmp_call_handlers (reginfo=0xecf6f8, >>> reqinfo=0xed57f8, requests=0xed6e60) at >>> agent_handler.c:631 >>> #11 0xb6f21bb4 in handle_var_requests >>> (asp=asp@entry=0xed57a8) at snmp_agent.c:3017 >>> #12 0xb6f22076 in handle_pdu (asp=0xed57a8) at >>> snmp_agent.c:3803 >>> #13 0xb6f22140 in netsnmp_handle_request >>> (asp=asp@entry=0xed57a8, status=status@entry=0) at >>> snmp_agent.c:3692 >>> #14 0xb6f2233e in handle_snmp_packet >>> (session=<optimized out>, pdu=<optimized out>, >>> magic=<optimized out>, reqid=<optimized out>, >>> op=<optimized out>) at snmp_agent.c:2299 >>> #15 0xb6ea53e4 in _sess_process_packet_handle_pdu >>> (isp=0xeb9aa0, isp=0xeb9aa0, transport=0xeb98b0, >>> pdu=0xed55c8, sp=0xeb9ae8, sessp=<optimized out>) at >>> snmp_api.c:5807 >>> #16 _sess_process_packet >>> (sessp=sessp@entry=0xeb9a88, sp=sp@entry=0xeb9ae8, >>> isp=0xeb9aa0, transport=transport@entry=0xeb98b0, >>> opaque=opaque@entry=0xebd170, olength=olength@entry=60, >>> packetptr=0xebf0e8 "03\002\001", length=53) at >>> snmp_api.c:5863 >>> #17 0xb6ea5a3a in _sess_read >>> (sessp=sessp@entry=0xeb9a88, >>> fdset=fdset@entry=0xbec489a0) at snmp_api.c:6124 >>> #18 0xb6ea5b14 in snmp_sess_read2 >>> (sessp=sessp@entry=0xeb9a88, >>> fdset=fdset@entry=0xbec489a0) at snmp_api.c:6397 >>> #19 0xb6ea5b44 in snmp_read2 (fdset=0xbec489a0) at >>> snmp_api.c:5912 >>> #20 0x00012c0c in ?? () >>> * >>> * >>> #0 __libc_do_syscall () at >>> ../sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:47 >>> #1 0xb6e3d1b2 in __libc_signal_restore_set >>> (set=0xbecc6320) at >>> ../sysdeps/unix/sysv/linux/nptl-signals.h:79 >>> #2 __GI_raise (sig=sig@entry=6) at >>> ../sysdeps/unix/sysv/linux/raise.c:48 >>> #3 0xb6e3de3a in __GI_abort () at abort.c:89 >>> #4 0xb6e647da in __libc_message >>> (do_abort=do_abort@entry=2, fmt=<optimized out>) at >>> ../sysdeps/posix/libc_fatal.c:175 >>> #5 0xb6e68b28 in malloc_printerr (action=<optimized >>> out>, str=0xb6ee4de4 "corrupted double-linked list", >>> ptr=<optimized out>, ar_ptr=<optimized out>) at >>> malloc.c:5087 >>> #6 0xb6e6b0d4 in _int_malloc >>> (av=av@entry=0xb6f017a4 <main_arena>, >>> bytes=bytes@entry=12) at malloc.c:3743 >>> #7 0xb6e6c556 in __libc_calloc (n=<optimized out>, >>> elem_size=<optimized out>) at malloc.c:3246 >>> #8 0xb6f9bcb8 in init_agent_snmp_session >>> (session=0x59cac0, pdu=<optimized out>) at >>> snmp_agent.c:1587 >>> #9 0xb6f9d368 in handle_snmp_packet >>> (session=<optimized out>, pdu=<optimized out>, >>> magic=0x0, reqid=<optimized out>, op=<optimized >>> out>) at snmp_agent.c:2227 >>> #10 0xb6f203e4 in _sess_process_packet_handle_pdu >>> (isp=0x59ca78, isp=0x59ca78, transport=0x59c888, >>> pdu=0x5bfe88, sp=0x59cac0, sessp=<optimized out>) at >>> snmp_api.c:5807 >>> #11 _sess_process_packet >>> (sessp=sessp@entry=0x59ca60, sp=sp@entry=0x59cac0, >>> isp=0x59ca78, transport=transport@entry=0x59c888, >>> opaque=opaque@entry=0x5a1118, olength=olength@entry=60, >>> packetptr=0x5a20e0 "00\002\001", length=50) at >>> snmp_api.c:5863 >>> #12 0xb6f20a3a in _sess_read >>> (sessp=sessp@entry=0x59ca60, >>> fdset=fdset@entry=0xbecc69a0) at snmp_api.c:6124 >>> #13 0xb6f20b14 in snmp_sess_read2 >>> (sessp=sessp@entry=0x59ca60, >>> fdset=fdset@entry=0xbecc69a0) at snmp_api.c:6397 >>> #14 0xb6f20b44 in snmp_read2 (fdset=0xbecc69a0) at >>> snmp_api.c:5912 >>> #15 0x00012c0c in ?? () >>> Backtrace stopped: previous frame identical to this >>> frame (corrupt stack?) >>> * >>> >>> >>> eth0 Link encap:Ethernet HWaddr 62:96:0C:F6:A0:28 >>> inet addr:15.77.45.114 Bcast:15.77.47.255 >>> Mask:255.255.252.0 >>> inet6 addr: >>> 2620:0:a02:e00d:6096:cff:fef6:a028/64 Scope:Global >>> inet6 addr: >>> 2620:0:a02:e00e:7925:979f:3372:607e/128 Scope:Global >>> inet6 addr: fe80::6096:cff:fef6:a028/64 >>> Scope:Link >>> UP BROADCAST RUNNING MULTICAST MTU:1500 >>> Metric:1 >>> RX packets:108792 errors:0 dropped:0 >>> overruns:0 frame:0 >>> TX packets:5110 errors:0 dropped:0 >>> overruns:0 carrier:0 >>> collisions:0 txqueuelen:1000 >>> RX bytes:121134374 (115.5 MiB) TX >>> bytes:5412555 (5.1 MiB) >>> Interrupt:42 >>> >>> lo Link encap:Local Loopback >>> inet addr:127.0.0.1 Mask:255.0.0.0 >>> inet6 addr: ::1/128 Scope:Host >>> UP LOOPBACK RUNNING MTU:65536 Metric:1 >>> RX packets:2901 errors:0 dropped:0 >>> overruns:0 frame:0 >>> TX packets:2901 errors:0 dropped:0 >>> overruns:0 carrier:0 >>> collisions:0 txqueuelen:1 >>> RX bytes:379572 (370.6 KiB) TX >>> bytes:379572 (370.6 KiB) >>> >>> wlan0 Link encap:Ethernet HWaddr 10:5B:AD:A6:77:A4 >>> inet addr:192.168.16.30 >>> Bcast:192.168.16.255 Mask:255.255.255.0 >>> inet6 addr: >>> b706:6100:88e0:f21e:125b:adff:fea6:77a4/64 Scope:Global >>> inet6 addr: >>> 72e1:4617:c9d3:9f78:125b:adff:fea6:77a4/64 Scope:Global >>> inet6 addr: fe80::125b:adff:fea6:77a4/64 >>> Scope:Link >>> inet6 addr: >>> 3e4:4137:147c:5726:125b:adff:fea6:77a4/64 Scope:Global >>> inet6 addr: >>> b772:c829:5066:e75f:125b:adff:fea6:77a4/64 Scope:Global >>> inet6 addr: 1616::69cc:7484:3980:a5af/128 >>> Scope:Global >>> inet6 addr: >>> b102:a15f:713b:c851:125b:adff:fea6:77a4/64 Scope:Global >>> UP BROADCAST RUNNING MULTICAST MTU:1500 >>> Metric:1 >>> RX packets:1223 errors:0 dropped:294 >>> overruns:0 frame:0 >>> TX packets:382 errors:0 dropped:2 >>> overruns:0 carrier:0 >>> collisions:0 txqueuelen:1000 >>> RX bytes:219993 (214.8 KiB) TX >>> bytes:152626 (149.0 KiB) >>> >>> >>> >>> _______________________________________________ >>> Net-snmp-users mailing list >>> Net-snmp-users@lists.sourceforge.net >>> <mailto:Net-snmp-users@lists.sourceforge.net> >>> Please see the following page to unsubscribe or change other >>> options: >>> https://lists.sourceforge.net/lists/listinfo/net-snmp-users >>
_______________________________________________ Net-snmp-users mailing list Net-snmp-users@lists.sourceforge.net Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users
