Guest

Preview Tool

Cisco Bug: CSCvi66495 - Recursive routing / Tunnel loop causing memory corruption and crash

Last Modified

Jul 05, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

15.5(3)M5

Description (partial)

Symptom:
A crash may be seen due to a tunnel recursion via OSPF.


Checkheaps is reporting the previous pointer blk as corrupted, however it is pointing correctly to where the current block starts.

0: *Mar 19 11:26:47.452 MDT: %SYS-3-BADBLOCK: Bad block pointer 100A31A8
-Traceback= 5C39354z 403C23Cz 400EEDCz 4010810z 401F62Cz 5348774z 676CCB8z 4F68798z 4F4F6C8z
003283: *Mar 19 11:26:47.452 MDT: %SYS-6-BLKINFO: Corrupted previous pointer blk 100A31A8, words 2808, alloc 4F5AA28, Free, dealloc D0D0D0D, rfcnt 0
-Traceback= 5C39354z 400A504z 403C24Cz 400EEDCz 4010810z 401F62Cz 5348774z 676CCB8z 4F68798z 4F4F6C8z

%Software-forced reload

Conditions:
A certain route is learnt towards the tunnel destination within the tunnel itself.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.