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Cisco Bug: CSCur17647 - clear ip nat translation with incomplete ESP entries will cause crash

Last Modified

Sep 14, 2019

Products (96)

  • Cisco IOS
  • Cisco 2951 Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
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Known Affected Releases

15.4(3)M

Description (partial)

Symptom:
Right after clear ip nat trans cmd is issued, the logs will display the following pattern:
%SYS-3-CPUHOG: Task is running for (2004)msecs, more than (2000)msecs (208/179),process = SSH Process.
%SYS-3-CPUHOG: Task is running for (4004)msecs, more than (2000)msecs (412/179),process = SSH Process.
.
.
%SYS-3-CPUHOG: Task is running for (20008)msecs, more than (2000)msecs (4701/179),process = SSH Process.
.
.
%SYS-3-CPUHOG: Task is running for (28004)msecs, more than (2000)msecs (6426/179),process = SSH Process.
%ALIGN-1-FATAL: Illegal access to a low address
 addr=0x84, pc=0x325BE28Cz , ra=0x325BE280z , sp=0x429DA8A0

%ALIGN-1-FATAL: Illegal access to a low address
 addr=0x84, pc=0x325BE28Cz , ra=0x325BE280z , sp=0x429DA8A0


TLB (store) exception, CPU signal 10, PC = 0x325C238C

Conditions:
show ip nat translation has among other things shows the following:
 0 esp_conn=0x2C63A218, hanging off nat entry 0x2D6C4CF8
 1 esp_conn=0x2C63A238, hanging off nat entry 0x2D6BF738
 2 esp_conn=0x3007C818, hanging off nat entry 0x2CF91D60
 3 esp_conn=0x3007C7D8, hanging off nat entry 0x2CF966E0
 4 esp_conn=0x3007C778, hanging off nat entry 0x2CF932D0
 5 esp_conn=0x2D3F3DE0, hanging off nat entry 0x2CF8C490
 6 esp_conn=0x2D3F3BE0, hanging off nat entry 0x2D726250

Crash is very likely to happen when clear ip nat translation OR clear ip nat translation esp is issued
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