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Cisco Bug: CSCvt99095 - Traceback: High CPU on standby RSP due to IOMD with A900-IMASER14A/S installed

Last Modified

Sep 10, 2020

Products (1)

  • Cisco ASR 900 Series Aggregation Services Routers

Known Affected Releases

16.6.2 16.6.6

Description (partial)

Symptom:
The logs report that Process Manager (PMAN) identified that the Input Output Module Daemon (IOMD) is held down:

<div style="font-family:courier;white-space:pre;">
#show logging
...
Apr 22 22:22:31.525 CEST: %IOSXE-3-PLATFORM:  SIP0: Apr 22 22:22:31 pman.sh: %PMAN-3-PROCHOLDDOWN: The process iomd has been helddown (rc 143)
Apr 23 04:47:26.357 CEST: %IOSXE-3-PLATFORM:  SIP0: Apr 23 04:47:26 pman.sh: %PMAN-3-PROCHOLDDOWN: The process iomd has been helddown (rc 143)
</div>


When the command 'show process cpu platform sorted location' is used to identify the culprit of the high CPU all the values are in zero and the CPU usage is high:

<div style="font-family:courier;white-space:pre;">
#show proc cpu platform sorted location R0
CPU utilization for five seconds: 55%, one minute: 57%, five minutes: 57%
Core 0: CPU utilization for five seconds: 100%, one minute: 64%, five minutes: 57%     <<< 100% of CPU usage for the last 5 secs
Core 1: CPU utilization for five seconds: 18%, one minute: 50%, five minutes: 57%
   Pid    PPid    5Sec    1Min    5Min  Status         Size  Name
---------------------------------------------------------------------------------
 32463       1      0%      0%      0%  S           8966144  rotee
 32450   29733      0%      0%      0%  S          64049152  ptpd_uea
 32398   32133      0%      0%      0%  S         205758464  iomd
</div>

Conditions:
The device runs with standby supervisor card and a serial module is installed:

<div style="font-family:courier;white-space:pre;">
#show platform
Chassis type: ASR-903U

Slot      Type                State                 Insert time (ago) 
--------- ------------------- --------------------- ----------------- 
 0/0      A900-IMASER14A/S    ok                    3w2d
 0/4      A900-IMA8S          ok                    3w2d
 0/5      A900-IMA8S          ok                    3w2d
R0        A900U-RSP2A-128     ok, standby           3w2d                <<< AFFECTED
R1        A900-RSP2A-128      ok, active            3w2d
</div>
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