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Cisco Bug: CSCuj27720 - fcp_pfm_do_exp_log: Failed to create FCP KPSS service - kernel

Last Modified

Feb 03, 2017

Products (7)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases

6.0(2)N1(2a) 6.0(2)N3(0.213)

Description (partial)

Nexus 5500 Series UP switch, with interfaces configured as fc, may enter a state in which all interfaces on certain module become stuck with these symptoms:

- Symptom 1:  
Interfaces which were enabled after the trigger may be unavailable. and might report as following.

    %PORT-5-IF_DOWN_BIT_ERR_RT_THRES_EXCEEDED Interface fc1/38 is down (Error disabled - bit error rate too high)

    NOTE : the same attached device works fine when moved to fc interface on another expansion module, like fc2/1 from fc1/38

- Symptom 2 : 
NX-OS software may have problems communicating with affected module's hardware, as reported by error messages like this.

   switch# sh hardware int fc-mac 1 port 36 port-info
   gat_fcp_cli_port_port_info: dev_debug() returned error, errno = 22, rc = -1

- Symptom 3 :
Also the following messages might be seen in syslog.

   %KERN-3-SYSTEM_MSG: FCP_ERRFCP_PORT: fcp_pfm_do_exp_log@5327, jiffies = 0x780398f:ERROR: fcp_pfm_do_exp_log: Failed to create FCP KPSS service - kernel

This issue is triggered by the following command.

       `show hardware internal fc-mac pss`

!!! Please do NOT use this command !!!

The issue will be seen with Nexus 5500 UP switch series, on interfaces configured as fc (fibre channel)
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