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

Last Modified

Jul 05, 2018

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

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

A certain route is learnt towards the tunnel destination within the tunnel itself.
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