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Cisco Bug: CSCvv93342 - Linecard crash due to memory corruption due to multicast

Last Modified

Oct 01, 2020

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.5(1.0.1)SY4

Description (partial)

Symptom:
A crash caused by memory corruption, typically a block overrun on a linecard is seen. The logs prior to the crash look similar to this:

%SYS-SW1_DFC3-3-OVERRUN: Block overrun at 294B2E78 (red zone 00000000)
-Traceback= 20C1B870z 20C1C5DCz 20C1C924z 20C1CAE8z
%SYS-SW1_DFC3-6-MTRACE: mallocfree: addr, pc
 2A2880A4,20638A98 2A2880A4,30000032 54AE1048,20638A6C 54AE1048,40000296
 54ACE93C,20638A44 54ACE93C,4000020A 2A2880A4,21822748 543D6194,21822604
%SYS-SW1_DFC3-6-MTRACE: mallocfree: addr, pc
 33D42410,60000012 33D423AC,21542270 2A1FFC6C,21542268 33DB1178,20C257D4
 33DB1178,20C25838 33DB1178,30000076 33D423AC,2153A540 33D423AC,4000001E
%SYS-SW1_DFC3-6-BLKINFO: Corrupted redzone blk 294B2E78, words 16, alloc 211DD924, InUse, dealloc 331DB28C, rfcnt 1
-Traceback= 20BFBCD4z 20C1BC10z 20C1C5DCz 20C1C924z 20C1CAE8z
%SYS-SW1_DFC3-6-MEMDUMP: 0x294B2E78: 0xAB1234CD 0x1370000 0x147 0x51B07330
%SYS-SW1_DFC3-6-MEMDUMP: 0x294B2E88: 0x211DD924 0x294B2EC0 0x294B2E48 0x80000010
%SYS-SW1_DFC3-6-MEMDUMP: 0x294B2E98: 0x1 0x0 0x0 0x0

Conditions:
It's unclear at this moment what the exact conditions are. The issue has been seen when there's a multicast event, such as storm.
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