Hosts installed with NSX-T 2.1 Experience PSOD
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Hosts installed with NSX-T 2.1 Experience PSOD

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Article ID: 325717

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Updated On:

Products

VMware NSX

Issue/Introduction

Symptoms:
Hosts installed with NSX-T 2.1 experience PSOD

You see the following PSOD stack trace:
  
2018-09-11T15:38:34.070Z cpu5:10552239)@BlueScreen: #PF Exception 14 in world 10552239:NetWorld-VM- IP 0x41803505e95b addr 0x25
PTEs:0x2d1549027;0x1aa388027;0xbfffffffff001;
2018-09-11T15:38:34.070Z cpu5:10552239)Code start: 0x418033c00000 VMK uptime: 103:19:02:48.414
2018-09-11T15:38:34.071Z cpu5:10552239)0x43919d79b070:[0x41803505e95b][email protected]#1.0.6.5+0x37 stack: 0x0
2018-09-11T15:38:34.071Z cpu5:10552239)0x43919d79b130:[0x418035047e6a][email protected]#1.0.6.5+0x12 stack: 0x4319b7377660
2018-09-11T15:38:34.071Z cpu5:10552239)0x43919d79b140:[0x41803501f50e][email protected]#1.0.6.5+0x4a stack: 0x2f6f30
2018-09-11T15:38:34.071Z cpu5:10552239)0x43919d79b270:[0x41803504d74a][email protected]#1.0.6.5+0xea stack: 0x43919d79b3b0
2018-09-11T15:38:34.072Z cpu5:10552239)0x43919d79b290:[0x418035078a75][email protected]#1.0.6.5+0x25c stack: 0x439100000001
2018-09-11T15:38:34.072Z cpu5:10552239)0x43919d79b320:[0x41803505470c][email protected]#1.0.6.5+0x1b2c stack: 0x430939822da0
2018-09-11T15:38:34.072Z cpu5:10552239)0x43919d79b610:[0x418035039bfa][email protected]#1.0.6.5+0x342 stack: 0x0
2018-09-11T15:38:34.073Z cpu5:10552239)0x43919d79b7d0:[0x41803501a1da][email protected]#1.0.6.5+0x5ee stack: 0x0
2018-09-11T15:38:34.073Z cpu5:10552239)0x43919d79bb70:[0x41803498e203][email protected]#v2_4_0_0+0x9b stack: 0x43919d79bd38
2018-09-11T15:38:34.073Z cpu5:10552239)0x43919d79bbb0:[0x418033ddae3c]IOChain_Resume@vmkernel#nover+0x234 stack: 0x43060ea36ad8
2018-09-11T15:38:34.073Z cpu5:10552239)0x43919d79bc60:[0x418033e0b83d]Port_InputResume@vmkernel#nover+0x89 stack: 0x1
2018-09-11T15:38:34.074Z cpu5:10552239)0x43919d79bcb0:[0x418033e699de]Vmxnet3VMKDevTQDoTx@vmkernel#nover+0x157a stack: 0x439100000002
2018-09-11T15:38:34.074Z cpu5:10552239)0x43919d79be40:[0x418033e6aef8]Vmxnet3VMKDev_AsyncTx@vmkernel#nover+0x8c stack: 0x10043914208baf8
2018-09-11T15:38:34.074Z cpu5:10552239)0x43919d79bf80:[0x418033df789b]NetWorldPerVMCB@vmkernel#nover+0x15b stack: 0x0
2018-09-11T15:38:34.074Z cpu5:10552239)0x43919d79bfe0:[0x418033ecb415]CpuSched_StartWorld@vmkernel#nover+0x99 stack: 0x0
2018-09-11T15:38:34.078Z cpu5:10552239)base fs=0x0 gs=0x418041400000 Kgs=0x0


Environment

VMware NSX-T Data Center
VMware NSX-T Data Center 2.x

Cause

This issue occurs in NSX-T 2.1 due to the way DFW handles TFTP flows. In an event of random traffic patterns containing TFTP flows, a timing situation can exist which ultimately causes a host crash. Retransmission of the initial TFTP packet on an established TFTP session while distributed firewall is enabled may lead purple diagnostic screen for the participating hosts. 

Resolution

This issue is fixed in NSX-T 2.2 and subsequent versions

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