[j-nsp] mx240 - chassisd process takes whole cpu

[Piotr]

Hi,

Since 13:50 i have very high cpu on routing engine, router doesn't 
answer for some snmp request (re cpu, interface counters are ok) but 
besides this, looks good - router pass traffic. It looks like problem 
with chassisd process ( nanslp ?? state). I don't see any problems with 
syn flood, ntp attack or other dos. All graphs shows normal traffic. 
What can be a reason of that? maybe it can be some bug in 11.4R5.5 ?  I 
will plan restart entire router in next service window but maybe there 
is a other way to solve problem? i think about restart chassisd process 
only but i'm not sure about traffic impact ?

thanks for any help.


logs from time when it began:

Jun 19 13:50:10 CHASSISD_SIGPIPE: SIGPIPE received
Jun 19 13:50:10 CHASSISD_SIGPIPE: SIGPIPE received
Jun 19 13:50:10 CHASSISD_SIGPIPE: SIGPIPE received
Jun 19 13:50:22 CHASSISD_SIGPIPE: SIGPIPE received


@MX240# run show chassis routing-engine
Routing Engine status:
   Slot 0:
     Current state                  Master
     Election priority              Master (default)
     Temperature                 25 degrees C / 77 degrees F
     CPU temperature             25 degrees C / 77 degrees F
     DRAM                      8960 MB
     Memory utilization          46 percent
     CPU utilization:
       User                      53 percent
       Background                 7 percent
       Kernel                    23 percent
       Interrupt                  0 percent
       Idle                      16 percent
     Model                          RE-S-1800x2



@MX240# run show system processes extensive

last pid: 74857;  load averages:  0.91,  1.00,  1.02  up 583+10:51:40 
  00:02:30
139 processes: 3 running, 120 sleeping, 1 zombie, 15 waiting

Mem: 2070M Active, 181M Inact, 190M Wired, 106M Cache, 214M Buf, 4755M Free
Swap: 8192M Total, 8192M Free


   PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
  1442 root        2   8  -88   162M   136M nanslp 200.9H 83.01% chassisd
    11 root        1 171   52     0K    16K RUN       ??? 11.77% idle
  1481 root        1 111   15   245M   243M select 179.3H  0.00% sampled