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Cisco Bug: CSCvv39772 - High CPU due to "rngd" process on FPR1K

Last Modified

Sep 02, 2020

Products (1)

  • Cisco Firepower 9300 Series

Known Affected Releases

2.7(1.111)

Description (partial)

Symptom:
Critcal error reported by FMC managing FPR1K devices:
"CPU00 usage is 100%"

"rngd" process is contantly top CPU consumer apart from lina:

====================================================================================================================================
top - 2020-08-03 04:02:02 up 100 days, 17:17,  0 users,  load average: 6.43, 6.9
Tasks: 249 total,   4 running, 243 sleeping,   0 stopped,   2 zombie
%Cpu(s): 39.7 us,  4.1 sy,  0.1 ni, 56.2 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem : 16455656 total,  7004616 free,  7564588 used,  1886452 buff/cache
KiB Swap:  9994148 total,  8280920 free,  1713228 used.  8438336 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
20498 root       0 -20 2540548 607668 139952 S 400.2  3.7 580258:36 lina
 4997 root      20   0   11396     36     12 R  74.2  0.0  99677:24 rngd
20179 root      20   0  401212   5688   4680 S   8.2  0.0  11529:56 loggerd
 5678 root      20   0 1760536  15268  15032 S   2.7  0.1   3966:28 portmgr
20185 root      20   0  441532  14288   4636 S   1.1  0.1   1423:16 sftunnel
20380 root      20   0 4706884 390172  16568 S   1.0  2.4   4722:07 SFDataCorr+
 5712 root      23   3 1471972 115748  55000 S   0.8  0.7   1226:05 svc_sam_dme

Conditions:
FPR1K running 6.5.0.4 or 6.6.0.1
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