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Cisco Bug: CSCvu98502 - Post LDP crash due to Abort/HB timeout LDP might be unable to bind to the socket and fails recover

Last Modified

Oct 19, 2020

Products (9)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 2-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

8.0(1)

Description (partial)

Symptom:
On a Nexus 7000/7700 switch after a LDP process crash the process might not recover and the LDP neighbors will not come up.
The following would be seen in the log when the LDP process crashes:
2020 Jul  4 16:05:16 %SYSMGR-3-HEARTBEAT_FAILURE: Service "ldp" sent SIGABRT for not setting heartbeat for last 4 periods. Last heartbeat 20.80 secs ago.
2020 Jul  4 16:05:16 %KERN-3-SYSTEM_MSG: [31281733.830629] (1:291:1008)ldp:ldpx_batch[7589]: rwsem_flush process/thread still exist (1:291:1)ldp[7550] - kernel
2020 Jul  4 16:05:16 %KERN-3-SYSTEM_MSG: [31281733.830780] (1:291:1008)ldp:ldpx_batch[7589]: rwsem_flush 1 threads still exist - kernel
2020 Jul  4 16:05:17 %KERN-2-SYSTEM_MSG: [31281733.843440] ldp[7550]: rwsem unexpected owner->magic cc008780 - kernel
2020 Jul  4 16:05:17 %SYSMGR-2-SERVICE_CRASHED: Service "ldp" (PID 7550) hasn't caught signal 6 (core will be saved).
2020 Jul  4 16:05:19 %LDP-5-GR:    LDP restarting gracefully.  Preserving forwarding state for 119 seconds.

Conditions:
- Nexus 7000/7700
- MPLS LDP feature in use
- LDP process crash
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Bug Details Include

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