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Knowledge Base

In an NSX-T environment ESXi hosts fail with a PSOD (71105)

Last Updated: 2/25/2020Categories: InformationalTotal Views: 7184Language:
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Symptoms

NSX-T Data Center 2.4.0/2.4.1 environment

ESXi 6.5 or ESXi 6.7

DFW stateful rules are configured with Service Type TCP/UDP/ALG for any of the following ports

TCP 21   - ALG FTP
TCP 1521 - ALG ORACLE_TNS
TCP 111  - ALG SUN_RPC_TCP
TCP 135  - ALG MS_RPC_TCP
UDP 69   - ALG TFTP

The PSOD backtrace may be similar to this example however backtraces may differ. If in doubt, please open an SR with VMware GSS for clarification.

@BlueScreen: #GP Exception 13 in world 4034471:VSIP PF Purg @ 0x41800ccb126a
Code start: 0x41800b000000 VMK uptime: 44:22:55:31.848
0x451b9e71beb8:[0x41800ccb126a][email-masked]#1.0.6.7+0xe stack: 0x41800b03db75
0x451b9e71bec0:[0x41800ccb1e84][email-masked]#1.0.6.7+0xe1 stack: 0x4325d5a02058
0x451b9e71bf20:[0x41800ccf3ed8][email-masked]#1.0.6.7+0x71 stack: 0xfffffffffffffff3
0x451b9e71bf30:[0x41800cc60cfb][email-masked]#1.0.6.7+0xd0 stack: 0x0
0x451b9e71bf70:[0x41800ccf3dfb][email-masked]#1.0.6.7+0x50 stack: 0x41800ccf3dac
0x451b9e71bf90:[0x41800b12902e]vmkWorldFunc@vmkernel#nover+0x4f stack: 0x41800b12902a
0x451b9e71bfe0:[0x41800b30e272]CpuSched_StartWorld@vmkernel#nover+0x77 stack: 0x0

Note: PSOD refers to a Purple Screen of Death which is often associated with host crashes.

Cause

This PSOD is caused by a race condition related to how ALG traffic is handled by the DFW.

Resolution

This issue is resolved in VMware NSX-T Data Center 2.4.2, available at VMware Downloads.

Workaround

To workaround the issue, stateless DFW rules can be created at the top of the firewall to catch traffic on these ports. Stateless rules do not used ALG.

Under Advanced Network & Security:

Create a Stateless firewall section and add any rules required for the impacted ports

Add Section, select "Enable Stateless Firewall"

Select Section and click Add Rule e.g.

Source Any to Destination Any Service TCP/UDP/ALG 21, 1521, 111, 135, 69 Allow

Disable and Reenable the DFW to clear old ALG entries and ensure all impacted flows use the new stateless rules

Settings -> Edit Distributed Firewall -> Status disable

Note: If DFW is managed under Policy Simplified UI the rule changes can be added there.

Detectable by VMware SkylineTM

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