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Knowledge Base

Traffic going through Edge Node is interrupted and dataplane service (dp-fp) crashes and generates core dumps (74965)

Last Updated: 2/23/2024Categories: TroubleshootingTotal Views: 11840Language:
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Symptoms

Traffic going through Edge Node is interrupted and dataplane service (dp-fp) crashes and generates core dumps.

Edge Node logs (syslog.log) display message(s) similar to:

#get log-file syslog.log | find core.dp-fp
<12>1 2019-12-02T05:15:36.635451+00:00 at101esg02.vmw.arka.run NSX - - - Core file generated: /var/log/core//core.dp-fp:1.1575263711.2688.0.11.g

Edge Node logs (kern.log) display message(s) similar to:

#get log-file kern.log | find "Segmentation fault occurred"
kern.log:<5>1 2019-08-28T01:00:29.224169+00:00 edge01.vmware.com kernel - - - [3198001.445096] grsec: Segmentation fault occurred at 0000000000000066 in /opt/vmware/nsx-edge/sbin/datapathd[dp-fp:1:1697] uid/euid:0/0 gid/egid:124/124, parent /lib/systemd/systemd[systemd:1] uid/euid:0/0 gid/egid:0/0

When BGP is used, BGP neighborship goes down/up when the dataplane service crashes.

When static routes are used, Logical Router routing tables display "unknown" interfaces and static routes are not working as expected following dataplane service crashes.

Example:
#nsxt-edge01(tier0_sr)> get route
...
t0s> * 172.16.0.0/12 [1/0] via 10.10.31.1, unknown, 05w2d02h
t0c * 10.10.22.0/27 is directly connected, uplink-277, 12:52:30
t0c> * 10.10.22.0/27 is directly connected, uplink-277, 12:52:30
t0s> * 192.168.240.0/24 [1/0] via 10.10.31.1, unknown, 05w2d02h
t0s> * 192.168.241.0/24 [1/0] via 10.10.31.1, unknown, 05w2d02h
t0s> * 192.168.242.0/24 [1/0] via 10.10.31.1, unknown, 05w2d02h

Cause

This issue occurs due to an issue with the Flow cache feature (caches forwarding decision on Edge Nodes to improve performances) where segmentation fault occurs when a NULL flow entry being added to the Flow Cache tables. As a result the dataplane service on the Edge Node crashes causing a dataplane impact as described in the Symptoms.

Resolution

This issue is resolved in:

VMware NSX-T Data Center 2.4.3, available at VMware Downloads.

VMware NSX-T Data Center 2.5.1, available at VMware Downloads

VMware NSX-T Data Center 3.0, available at VMware Downloads.

Workaround

To workaround this issue, disable Flow Cache on all the Edge Nodes following the steps below:
1. Login to the Edge Node using the admin account.
2. Disable Flow cache:
> set dataplane flow-cache disabled
3. Restart the dataplane server
> restart service dataplane -> (Note this will cause a brief interruption to the dataplane)
Note: this setting persists across Edge Node reboot but Flow Cache will need to be disabled on newly deployed Edge Nodes.

Confirm Flow cache is disabled:
> get dataplane flow-cache config
Example of expected output:
Enabled            : false
Mega_hard_timeout_ms: 0
Mega_size          : 0
Mega_soft_timeout_ms: 0
Micro_size         : 0

To workaround the issue where the static routes are showing as "unknown" remove and re-add the static route or edit the route and publish again, this is temporary workaround and issue may occur again so Flow Cache should be disabled to prevent re-occurrences.

Detectable by VMware SkylineTM

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