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Cisco Bug: CSCun38000 - Chunk mr leaks at l4f_create_common_stream_state with Scansafe enabled

Last Modified

Feb 11, 2019

Products (81)

  • Cisco IOS
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
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Known Affected Releases

15.2(4)M3.11 15.4(1)T1

Description (partial)

Symptom:
The Chunk Manager leaks memory when scansafe is enabled:

Router#show processes memory sorted
Processor Pool Total:  754069416 Used:  182684708 Free:  571384708
      I/O Pool Total:   67108864 Used:   22483088 Free:   44625776

 PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
   1   0  158253948   54468648  103913792          0          0 Chunk Manager

Router#show chunk summary
Chunk Manager:
 1099591 chunks created, 1094882 chunks destroyed
 1095186 siblings created, 1094873 siblings trimmed
     Element Sibling size Total   Total   Total   Inuse Ovrhd Chunk
Flag size(b) --range(b)-- Siblg   alloc    Free     HWM   (b) name
A IB M  1948      248,  65536   1062    35079    1353   35012 1602340 L4F stream Stat

When the content-scan config is removed from the interface, the memory does not clear.

Conditions:
This issue occurs when scansafe is enabled. The exact conditions triggering the leak are being investigated.
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