Public bug reported:
Description:
During automated validation of an Ubuntu 26.10 Desktop VM on VMware ESXi,
hot-adding a PVRDMA adapter resulted in a missing RDMA device.
The guest kernel logged “failed to get vmxnet3 device“ from vmw_pvrdma before
the VMXNET3 driver initialization messages appeared. The associated VMXNET3
Ethernet link subsequently came up, but the validation test reported that no
new RDMA device was detected.
Environment:
Guest OS: Ubuntu 26.10 Desktop
Architecture: x86_64
Kernel: 7.3.0-9-generic
Kernel build: #9-Ubuntu SMP PREEMPT_DYNAMIC, Mon Oct 5 10:38:02 UTC 2026
Guest drivers involved: vmw_pvrdma(AB97F2B4F5D1F62BF4FA20E） and
vmxnet3(1.9.0.0-k)
Steps to reproduce:
1. Boot an Ubuntu 26.10 Desktop VM in a VMware environment configured to
support PVRDMA and the default network adaptor is E1000E.
2. Hot-add a PVRDMA adapter while the VM is running.
3. Inspect the guest kernel log and check whether a new RDMA device has been
registered, using rdma link show or /sys/class/infiniband/.
The failure was observed during automated testing. The exact reproduction
frequency has not yet been established.
Expected result:
The hot-added PVRDMA adapter initializes and registers an RDMA device once its
paired VMXNET3 device is available.
Actual result:
The vmw_pvrdma driver reports that it cannot obtain the paired VMXNET3 device.
VMXNET3 initialization subsequently proceeds and its Ethernet link comes up,
but the expected new RDMA device is not detected.
Relevant kernel log:
[ 325.041153] vmw_pvrdma 0000:13:00.1: enabling device (0000 -> 0002)
[ 325.042879] vmw_pvrdma 0000:13:00.1: device version 20, driver version 20
[ 325.043055] vmw_pvrdma 0000:13:00.1: failed to get vmxnet3 device
[ 325.051859] VMware vmxnet3 virtual NIC driver - version 1.9.0.0-k-NAPI
[ 325.052476] vmxnet3 0000:13:00.0: enabling device (0000 -> 0003)
[ 325.054681] vmxnet3 0000:13:00.0: # of Tx queues : 2, # of Rx queues : 2
[ 325.060343] vmxnet3 0000:13:00.0 eth0: NIC Link is Up 10000 Mbps
[ 325.106430] vmxnet3 0000:13:00.0 ens224f0: renamed from eth0
[ 325.207276] vmxnet3 0000:13:00.0 ens224f0: intr type 3, mode 0, 3 vectors
allocated
[ 325.210655] vmxnet3 0000:13:00.0 ens224f0: NIC Link is Up 10000 Mbps
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2172808
Title:
Ubuntu 26.10: PVRDMA hot-add fails with “failed to get vmxnet3 device”
— suspected VMXNET3/PVRDMA probe-order race
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