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SNMP process crash with signal 6 when switch time is modified

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TitleSNMP process crash with signal 6 when switch time is modified
Symptoms
  • SNMP master process crash with Signal 6
  • switch time is modified
  • switch has 497 days of sysuptime
  • sample log below
03/28/2016 11:56:01.29 <Erro:EPM.proc_conn_lost> MM-B: Connection lost with process snmpMaster
03/28/2016 11:56:01.01 <Crit:Kern.Alert> MM-B: b7fdf42c:  73 74   72   74   61   62   00   2e
03/28/2016 11:56:01.01 <Crit:Kern.Alert> MM-B: b7fdf424: <5d>  5a   59   c3   00   2e   73   68
03/28/2016 11:56:01.01 <Crit:Kern.Alert> MM-B: b7fdf41c:  90 90   90   90   90   90   eb   f3
03/28/2016 11:56:01.01 <Crit:Kern.Alert> MM-B: b7fdf414:  51 52   55   89   e5   0f   34   90
03/28/2016 11:56:01.01 <Crit:Kern.Alert> MM-B: b7fdf40c:  b8 ad   00   00   00   cd   80   90
03/28/2016 11:56:01.01 <Crit:Kern.Alert> MM-B: b7fdf404:  00 00   cd   80   90   8d   76   00
03/28/2016 11:56:01.01 <Crit:Kern.Alert> MM-B: Code:
03/28/2016 11:56:01.01 <Crit:Kern.Alert> MM-B: Process snmpMaster pid 7055 died with signal 6
03/28/2016 11:56:00.54 <Warn:EPM.proc_kill> MM-B: Process snmpMaster ID 7055 killed
03/28/2016 11:56:00.54 <Erro:EPM.Msg.timer_thread> MM-B: Because the snmpMasterMainThread (3082660720) thread of process 7055, has not responded within 41 periods of 15 seconds, the process will be terminated.

As a side effect this will also cause the switch to reboot after 497 days of sysuptime, because that also result in a change of this timer.
Environment
  • EXOS 15.4.1 and higher
Cause
SNMP Master process crash with Signal 6 with below back trace

Backtrace (top 20 frames):
#0  0xb7fdf424 in __kernel_vsyscall ()
#1  0xb7ccc086 in epoll_wait () at ../sysdeps/unix/syscall-template.S:82
#2  0xb7eaa6a8 in ipmlRecvEpoll (epollfd=5, peerId=peerId@entry=0xbffff2bc, pkt=pkt@entry=0x8104ce8, flags=flags@entry=0x0, timeout=timeout@entry=0xbffff2d0, status=status@entry=0xbffff22c) at /data3/release-manager/v15_5_3_4/everest_mm/code/system/ipml/src/ipml.c:1416
#3  0xb7eac35b in ipmlRecvOnServiceGroupInternal (group=0x80fb960, peerId=peerId@entry=0xbffff2bc, pkt=pkt@entry=0x8104ce8, flags=0x0, flags@entry=0x8104ce8, timeout=timeout@entry=0xbffff2d0) at /data3/release-manager/v15_5_3_4/everest_mm/code/system/ipml/src/ipmlServiceGroup.c:434
#4  0xb7e9b6dd in dispatchHandler () at dispatch.c:764
#5  0x08082699 in main (argc=1, argv=0xbffff894, envp=0xbffff89c) at mastmain_extr.c:271


SNMP process crash with signal 6 when switch time is modified.
The issue caused is due to the unexpected timer WRAP value.
As a side effect this will also cause the switch to reboot after 497 days of sysuptime, because that also result in a change of this timer.
 
Resolution
CR# xos0064114 has been created to track this issue 

Target Release(s):    
EXOS 22.1.1 (Released)
EXOS 21.1.2 (Released)
EXOS 15.6.5-GA-Aug16 (Released)
EXOS 16.2.2 (Verified)
EXOS 15.7.4-GA-Aug16 (Released)
EXOS 16.1.3-GA-Aug16 (Released)
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