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SNMP master process ends unexpectedly with signal 6 with certain sequence of snmpbulkget and snmpget

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TitleSNMP master process ends unexpectedly with signal 6 with certain sequence of snmpbulkget and snmpget
Symptoms
  • SNMP master process crash with Signal 6
  • Memory leak observed for SNMPMaster process when device is stressed with multiple sessions. This results in the device becoming slow and unresponsive to CLI commands.
  • sample log below
07/17/2015 12:12:29.05 <Erro:EPM.proc_conn_lost> Slot-1: Connection lost with process snmpMaster
07/17/2015 12:12:10.46 <Crit:Kern.Card.Alert> Slot-1: 2afc9b34  0320f809 jalr   t9
07/17/2015 12:12:10.46 <Crit
:Kern.Card.Alert> Slot-1: 2afc9b30  00000000 nop
07/17/2015 12:12:10.46 <Crit:Kern.Card.Alert> Slot-1: 2afc9b2c  8f99829c lw     t9,-32100(gp)
07/17/2015 12:12:10.46 <Crit
:Kern.Card.Alert> Slot-1: 2afc9b28  8fa4002c lw     a0,44(sp)
07/17/2015 12:12:10.46 <Crit
:Kern.Card.Alert> Slot-1: 2afc9b24  afa70028 sw     a3,40(sp)
07/17/2015 12:12:10.46 <Crit:Kern.Card.Alert> Slot-1: 2afc9b20 <afa20024>sw     v0,36(sp)
07/17/2015 12:12:10.46 <Crit
:Kern.Card.Alert> Slot-1: 2afc9b1c  0000000c syscall 0
07/17/2015 12:12:10.46 <Crit
:Kern.Card.Alert> Slot-1: 2afc9b18  2402109a addiu  v0,zero,4250
07/17/2015 12:12:10.46 <Crit
:Kern.Card.Alert> Slot-1: 2afc9b14  8fa7000c lw     a3,12(sp)
07/17/2015 12:12:10.46 <Crit
:Kern.Card.Alert> Slot-1: Code:
07/17/2015 12:12:10.46 <Crit
:Kern.Card.Alert> Slot-1:
07/17/2015 12:12:10.46 <Crit
:Kern.Card.Alert> Slot-1: Process snmpMaster pid 1440 died with signal 6
Environment
  • EXOS 15.3.5 and higher
Cause
SNMP Master process crash with Signal 6 with below back trace

Backtrace (top 20 frames):
#0  0x2afc9b20 in epoll_wait () from /opt/bldtools/x-tools/mips-extr473-linux-gnu/mips-extr473-linux-gnu/sys-root/lib/libc.so.6
#1  0x2acf8198 in ipmlRecvEpoll (epollfd=5, peerId=0x7fff71d0, pkt=0x2c100468, flags=0x0, timeout=0x7fff71b8, status=0x7fff7118) at /data3/release-manager/v15_5_3_4-patch1-6/cougar/code/system/ipml/src/ipml.c:1416
#2  0x2acfa298 in ipmlRecvOnServiceGroupInternal (group=0x4ee960, peerId=0x7fff71d0, pkt=0x2c100468, flags=0x0, timeout=0x7fff71b8) at /data3/release-manager/v15_5_3_4-patch1-6/cougar/code/system/ipml/src/ipmlServiceGroup.c:434
#3  0x2ace7a9c in
dispatchHandler () at dispatch.c:764
#4  0x00450b2c in main (argc=1, argv=0x7fff7794, envp=0x7fff779c) at mastmain_extr
.c:271
 
Listing:
156           __pthread_disable_asynccancel (
cbuffer.oldtype);
157
158           /* We are going to look at shared data again, so get the lock.  */
159           lll_lock (cond->__data.__lock, pshared);
160
161           /* If a broadcast happened, we are done.  */
162           if (
cbuffer.bc_seq != cond->__data.__broadcast_seq)
163            
goto bc_out;
164
165           /* Check whether we are eligible for wakeup.  */
Resolution
CR# xos0061886 has been created to track this issue 
Additional notes

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