Preview Tool

Cisco Bug: CSCtc12321 - %SYS-2-CHUNKINVALIDHDR seen after upgrade

Last Modified

Feb 13, 2018

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)


Following error is seen after upgrade:

%SYS-2-CHUNKINVALIDHDR: Invalid chunk header type 1 for chunk XXXXXXXX, data XXXXXXXX -Process= "Virtual Exec", ipl= 5, pid= 114,  -Traceback= 0xXXXXXXXX 0xXXXXXXXX

Process noted in the error message may vary.


This is has been seen on Cisco routers running IOS version 12.4(15)T10 - it is not yet known what other versions this may affect.  This is seen with both QoS and IPSEC configured.
Bug details contain sensitive information and therefore require a 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.