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Cisco Bug: CSCvu28828 - fib_mgr crash after executing sh mpls forwarding exact-route label

Last Modified

Sep 02, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

6.4.2.BASE

Description (partial)

Symptom:
fib_mgr process crash after executing "show mpls forwarding exact-route" command

RP/0/RSP0/CPU0:May 8 18:10:43.451 GMT: SSHD_[65583]: %SECURITY-SSHD-6-INFO_SUCCESS : Successfully authenticated user 'a424339' from '10.67.0.68' on 'vty0'(cipher 'aes128-ctr', mac 'hmac-sha1') 
RP/0/RSP0/CPU0:May 8 18:33:30.524 GMT: dumper[59]: %OS-DUMPER-7-DUMP_REQUEST : Dump request for process pkg/bin/fib_mgr 
RP/0/RSP0/CPU0:May 8 18:33:30.526 GMT: dumper[59]: %OS-DUMPER-7-DUMP_ATTRIBUTE : Dump request with attribute 7 for process pkg/bin/fib_mgr 
RP/0/RSP0/CPU0:May 8 18:33:30.527 GMT: dumper[59]: %OS-DUMPER-4-SIGSEGV : Thread 3 received SIGSEGV - Segmentation Fault 
RP/0/RSP0/CPU0:May 8 18:33:30.527 GMT: dumper[59]: %OS-DUMPER-4-SIGSEGV_INFO : Accessed BadAddr 0x1 at PC 0x4402594. Signal code 1 - SEGV_MAPPER. Address not mapped. 
RP/0/RSP0/CPU0:May 8 18:33:30.527 GMT: dumper[59]: %OS-DUMPER-4-CRASH_INFO : Crashed pid = 377014 (pkg/bin/fib_mgr) 
RP/0/RSP0/CPU0:May 8 18:33:30.528 GMT: dumper[59]: %OS-DUMPER-7-PROC_PAGES : Process memory pages 1182 
RP/0/RSP0/CPU0:May 8 18:33:30.530 GMT: dumper[59]: %OS-RSVDPMEM-7-NO_MATCHING_STRING : Failed to find any line in /etc/platform_reserved_physmem for infra-structure : buffman 
RP/0/RSP0/CPU0:May 8 18:33:30.532 GMT: dumper[59]: %OS-DUMPER-6-FALLBACK_CHOICE : Fall back choice: 0(harddisk:/dumper) in use 
RP/0/RSP0/CPU0:May 8 18:33:30.533 GMT: dumper[59]: %OS-DUMPER-6-REGISTERS_INFO : EDI ESI EBP(fp) EXX

Conditions:
comand execute before fib_mgr crash:
 
894 a424339 vty0 exec Fri May 8 18:33:30.081 2020 GMT show mpls forwarding exact-route label 24187 bottom-label <label> 
895 a424339 vty0 exec Fri May 8 18:34:45.272 2020 GMT show mpls forwarding exact-route label 24187 ipv4 <ip_add> <ip_add>

The label is a recursive disposition label, which has multiple paths, such as L3VPN service labels with protection.
It affects all IOS-XR platforms since 6.2.2
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Bug Details Include

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