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Cisco Bug: CSCun75205 - Crash in ACLQOS Process Due to Memory Leak During FCoE Port-channel Flap

Last Modified

Aug 03, 2016

Products (1)

  • Cisco MDS 9000 Series Multilayer Switches

Known Affected Releases

6.2(7)S29 7.1(0)D1(0.106) 7.1(0)D1(0.95)

Description (partial)

Symptom:
An MDS or Nexus switch linecard may experience a memory leak in the "aclqos" process if FCoE port-channels experience flaps. Other triggers may exist. The following message will be seen if the "aclqos" process runs out of memory and crashes:

%SYSMGR-SLOTX-2-SERVICE_CRASHED: Service "aclqos" (PID XXXX) hasn't caught signal 6 (core will be saved).

To verify the leak is being seen, attach into the line card's console and check the following memory statistic:

switch# attach module x

module-x# show system internal aclqos mem-stats detail | inc ACLQOS_MEM_fc_vdc_pss_bmp_t
288 ACLQOS_MEM_fc_port_bmp_t                1449576 1449576  258024528  258024528

module-x# show system internal aclqos mem-stats detail | inc ACLQOS_MEM_fc_vdc_pss_bmp_t
288 ACLQOS_MEM_fc_port_bmp_t                1449600 1449600  258028800  258028800

module-x# show system internal aclqos mem-stats detail | inc ACLQOS_MEM_fc_vdc_pss_bmp_t
288 ACLQOS_MEM_fc_port_bmp_t                1455792 1455792  259130976  259130976

If the  "ACLQOS_MEM_fc_port_bmp_t" API is constantly growing in size (as seen by the last number in the output, which represents the maximum bytes this API has allocated), then this bug may have been hit.

Conditions:
This can be seen during FCoE port channel flaps. Other triggers may exist.
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