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Cisco Bug: CSCvv53724 - fib_mgr crash on mod80 linecard during fib NH update.

Last Modified

Sep 17, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

6.4.2

Description (partial)

Symptom:
On asr9k running 6.4.2 during LC restart and after BGP adjacencies came up, fib_mgr process crashed on all MOD80 LCs :

LC/0/0/CPU0:Aug 16 02:15:14.611 UTC: dumper[56]: %OS-DUMPER-4-SIGSEGV : Thread 5 received SIGSEGV - Segmentation Fault 
LC/0/0/CPU0:Aug 16 02:15:14.611 UTC: dumper[56]: %OS-DUMPER-4-SIGSEGV_INFO : Accessed BadAddr 0x28 at PC 0x4e799268. Signal code 1 - SEGV_MAPPER. Address not mapped. 
LC/0/0/CPU0:Aug 16 02:15:14.611 UTC: dumper[56]: %OS-DUMPER-4-CRASH_INFO : Crashed pid = 483438 (pkg/bin/fib_mgr) 
LC/0/0/CPU0:Aug 16 02:15:58.532 UTC: dumper[56]: %OS-DUMPER-5-DUMP_SUCCESS : Core dump success 
 
LC/0/1/CPU0:
LC/0/1/CPU0:Aug 16 02:15:19.616 UTC: dumper[56]: %OS-DUMPER-4-SIGSEGV : Thread 5 received SIGSEGV - Segmentation Fault 
LC/0/1/CPU0:Aug 16 02:15:19.616 UTC: dumper[56]: %OS-DUMPER-4-SIGSEGV_INFO : Accessed BadAddr 0x28 at PC 0x49bd1268. Signal code 1 - SEGV_MAPPER. Address not mapped. 
LC/0/1/CPU0:Aug 16 02:15:19.616 UTC: dumper[56]: %OS-DUMPER-4-CRASH_INFO : Crashed pid = 483438 (pkg/bin/fib_mgr) 
LC/0/1/CPU0:Aug 16 02:16:02.757 UTC: dumper[56]: %OS-DUMPER-5-DUMP_SUCCESS : Core dump success 
 
LC/0/3/CPU0:
LC/0/3/CPU0:Aug 16 02:15:25.689 UTC: dumper[56]: %OS-DUMPER-4-SIGSEGV : Thread 5 received SIGSEGV - Segmentation Fault 
LC/0/3/CPU0:Aug 16 02:15:25.689 UTC: dumper[56]: %OS-DUMPER-4-SIGSEGV_INFO : Accessed BadAddr 0x28 at PC 0x4d0af268. Signal code 1 - SEGV_MAPPER. Address not mapped. 
LC/0/3/CPU0:Aug 16 02:15:25.689 UTC: dumper[56]: %OS-DUMPER-4-CRASH_INFO : Crashed pid = 483438 (pkg/bin/fib_mgr) 
LC/0/3/CPU0:Aug 16 02:16:11.037 UTC: dumper[56]: %OS-DUMPER-5-DUMP_SUCCESS : Core dump success
 
Directory of harddisk:/dumper
22665       -rw-  81480198    Sun Aug 16 02:17:11 2020  first.fib_mgr_183.20200816-021514.node0_0_CPU0.ppc.Z

Conditions:
The crash is a must-hit if following conditions satisfied from PD FIB point of view,

-	This is a rx-nh object update
-	This rx-nh is with FIB_NH_ATTR_ANC attribute
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