Any ideas on how to resolve this? The problem seems to be in "transitioning" from one mib to the next.
Thanks, On Mon, Jan 25, 2016 at 4:32 PM, Sam Tannous <stann...@users.sf.net> wrote: > ------------------------------ > > * [bugs:#2693] <http://sourceforge.net/p/net-snmp/bugs/2693/> snmpwalk > causes snmpd hang and CPU spike* > > *Status:* open > *Group:* debian > *Created:* Mon Jan 25, 2016 09:32 PM UTC by Sam Tannous > *Last Updated:* Mon Jan 25, 2016 09:32 PM UTC > *Owner:* nobody > > On latest debian (Jessie, snmpd 5.7.2.1, also seen on 5.7.3) we noticed a > nasty bug where the snmpd > CPU spikes (to around 100%) and snmpd becomes completely unresponsive. > Only way to recover is a restart. > > The problem appears to be in the transition (snmpwalk) from .1.3.6.1.2.1.3 > to > .1.3.6.1.2.1.4 > > The bug occurs only when we have "-V systemonly" on our community string > > rocommunity public default -V systemonly > > *and* we expose these tables: > > view systemonly included .1.3.6.1.2.1.1 > view systemonly included .1.3.6.1.2.1.2 > view systemonly included .1.3.6.1.2.1.3 > view systemonly included .1.3.6.1.2.1.4.24 > > (Adding a view for .1.3.6.1.2.1.4.1 fixes this problem!) > > The output we see before the freeze is this: > > root@jessie-1:/home/stannous# snmpwalk -v2c -cpublic localhost .1 > ... > <output snipped> > ... > IF-MIB::ifOutDiscards.2 = Counter32: 0 > IF-MIB::ifOutDiscards.3 = Counter32: 0 > IF-MIB::ifOutErrors.1 = Counter32: 0 > IF-MIB::ifOutErrors.2 = Counter32: 0 > IF-MIB::ifOutErrors.3 = Counter32: 0 > IF-MIB::ifOutQLen.1 = Gauge32: 0 > IF-MIB::ifOutQLen.2 = Gauge32: 0 > IF-MIB::ifOutQLen.3 = Gauge32: 0 > IF-MIB::ifSpecific.1 = OID: SNMPv2-SMI::zeroDotZero > IF-MIB::ifSpecific.2 = OID: SNMPv2-SMI::zeroDotZero > IF-MIB::ifSpecific.3 = OID: SNMPv2-SMI::zeroDotZero > SNMPv2-SMI::mib-2.3.1.1.1.2.1.10.50.10.1 = INTEGER: 2 > SNMPv2-SMI::mib-2.3.1.1.1.2.1.10.50.10.23 = INTEGER: 2 > SNMPv2-SMI::mib-2.3.1.1.2.2.1.10.50.10.1 = Hex-STRING: 6C 64 1A 00 2F 53 > SNMPv2-SMI::mib-2.3.1.1.2.2.1.10.50.10.23 = Hex-STRING: 0C 4D E9 A0 C3 6E > SNMPv2-SMI::mib-2.3.1.1.3.2.1.10.50.10.1 = IpAddress: 10.50.10.1 > SNMPv2-SMI::mib-2.3.1.1.3.2.1.10.50.10.23 = IpAddress: 10.50.10.23 > Timeout: No Response from localhost > > root@jessie-1:~# cat /etc/os-release > PRETTY_NAME="Debian GNU/Linux 8 (jessie)" > NAME="Debian GNU/Linux" > VERSION_ID="8" > VERSION="8 (jessie)" > ID=debian > HOME_URL="http://www.debian.org/"; > SUPPORT_URL="http://www.debian.org/support/"; > BUG_REPORT_URL="https://bugs.debian.org/"; > root@jessie-1:~# dpkg -l | grep snmp > ii libsnmp-base 5.7.2.1+dfsg-1 > all SNMP configuration script, MIBs and documentation > ii libsnmp30:i386 5.7.2.1+dfsg-1 > i386 SNMP (Simple Network Management Protocol) library > ii libsnmp30-dbg 5.7.2.1+dfsg-1 > i386 SNMP (Simple Network Management Protocol) library debug > ii snmp 5.7.2.1+dfsg-1 > i386 SNMP (Simple Network Management Protocol) applications > ii snmp-mibs-downloader 1.1 > all Install and manage Management Information Base (MIB) files > ii snmpd 5.7.2.1+dfsg-1 > i386 SNMP (Simple Network Management Protocol) agents > > An strace of the snmpd process shows the following repeating pattern: > > open("/proc/sys/net/ipv4/conf/all/forwarding", O_RDONLY|O_LARGEFILE) = 13 > fstat64(13, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0xb77d1000 > read(13, "0\n", 1024) = 2 > close(13) = 0 > munmap(0xb77d1000, 4096) = 0 > open("/proc/sys/net/ipv4/conf/all/forwarding", O_RDONLY|O_LARGEFILE) = 13 > fstat64(13, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0xb77d1000 > read(13, "0\n", 1024) = 2 > close(13) = 0 > munmap(0xb77d1000, 4096) = 0 > open("/proc/sys/net/ipv4/conf/all/forwarding", O_RDONLY|O_LARGEFILE) = 13 > fstat64(13, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0xb77d1000 > read(13, "0\n", 1024) = 2 > close(13) = 0 > munmap(0xb77d1000, 4096) = 0 > open("/proc/sys/net/ipv4/conf/all/forwarding", O_RDONLY|O_LARGEFILE) = 13 > fstat64(13, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0xb77d1000 > read(13, "0\n", 1024) = 2 > close(13) = 0 > munmap(0xb77d1000, 4096) = 0 > open("/proc/sys/net/ipv4/conf/all/forwarding", O_RDONLY|O_LARGEFILE) = 13 > fstat64(13, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0xb77d1000 > read(13, "0\n", 1024) = 2 > close(13) = 0 > munmap(0xb77d1000, 4096) = 0 > open("/proc/sys/net/ipv4/conf/all/forwarding", O_RDONLY|O_LARGEFILE) = 13 > fstat64(13, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0xb77d1000 > read(13, "0\n", 1024) = 2 > close(13) = 0 > munmap(0xb77d1000, 4096) = 0 > open("/proc/sys/net/ipv4/conf/all/forwarding", O_RDONLY|O_LARGEFILE) = 13 > fstat64(13, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0xb77d1000 > read(13, "0\n", 1024) = 2 > close(13) = 0 > munmap(0xb77d1000, 4096) = 0 > > ------------------------------ > > Sent from sourceforge.net because you indicated interest in > https://sourceforge.net/p/net-snmp/bugs/2693/ > > To unsubscribe from further messages, please visit > https://sourceforge.net/auth/subscriptions/ >
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