NetKvm.sys works with DHCP？

[cheewill]

Hi：

 I installed virtio drivers with kvm-guest-drivers-windows-mm152 on my Huawei Cloud virtual machine. 
 After running for 20 days, the network disconnected. 
 I then executed a script : 

ipconfig /release
ipconfig /renew

At this point, my computer's IP changed to 169.*, and I captured a fulldump showing that ipconfig /renew was hanging‌.

4.001e64 ffff8e021aa3d040 005bac9 Blocked nt!KiSwapContext+0x76 -- may be ipconfig /release
nt!KiSwapThread+0x500
nt!KiCommitThreadWait+0x14f
nt!KeWaitForSingleObject+0x233
tdx!TdxDeactivateTransportAddress+0x21f
tdx!TdxDeleteTransportAddress+0x2b
tdx!TdxTdiDispatchCleanup+0x4b
nt!IofCallDriver+0x55
nt!IopCloseFile+0x17a
nt!ObCloseHandleTableEntry+0x51f
nt!NtClose+0xec
nt!KiSystemServiceCopyEnd+0x25
nt!KiServiceLinkage
netbt!DelayedNbtCloseFileHandles+0x94
netbt!CloseAddressesWithTransport+0x1ba
netbt!NbtSetNewAddress+0x2b4
netbt!TdiAddressNotification+0xe8
netbt!TdiAddressDeletion+0x13
TDI!TdiNotifyPnpClientList+0x19b
TDI!TdiExecuteRequest+0x239 -- excuting request
TDI!TdiHandleSerializedRequest+0x371
TDI!TdiDeregisterNetAddress+0xe
tdx!TdxProcessAddressChangeRoutine+0x300
tdx!TdxNaAddressChangeEvent+0x97
NETIO!NsiParameterChange+0xf4
tcpip!IppNotifyAddressChangeAtPassive+0x19c
tcpip!InetNsiWorkQueueRoutine+0x19
NETIO!NetiopIoWorkItemRoutine+0x57
nt!IopProcessWorkItem+0x93
nt!ExpWorkerThread+0x105
nt!PspSystemThreadStartup+0x55

360.007164 ffff8e02214380c0 005b7d8 Blocked nt!KiSwapContext+0x76 --- may be ipconfig /renew
nt!KiSwapThread+0x500
nt!KiCommitThreadWait+0x14f
nt!KeWaitForSingleObject+0x233 --- add the request in queue，and wait
TDI!TdiHandleSerializedRequest+0x346
TDI!TdiPnPHandler+0x7b
ndis!ndisHandleUModePnPOp+0x81
ndis!ndisHandlePnPRequest+0x196
ndis!ndisDispatchRequest+0x65
nt!IofCallDriver+0x55
nt!IopSynchronousServiceTail+0x1a8
nt!IopXxxControlFile+0xc67 -- ioctl： IOCTL_NDIS_DO_PNP_OPERATION
nt!NtDeviceIoControlFile+0x56
nt!KiSystemServiceCopyEnd+0x25 (TrapFrame @ ffffa101`6782e3c0)
ntdll!NtDeviceIoControlFile+0x14
KERNELBASE!DeviceIoControl+0x6b
KERNEL32!DeviceIoControlImplementation+0x81
dhcpcore!DhcpNdisHandlePnPEvent+0x207
dhcpcore!NetBTNotifyRegChanges+0xb8
dhcpcore!SetDhcpConfigurationForNICEx+0x65
dhcpcore!ReObtainInitialParameters+0x585
dhcpcore!AcquireParameters+0x91
dhcpcore!DhcpApiProcessAdapterOnlyApi+0x353
dhcpcore!RpcSrvRenewLease+0x94
RPCRT4!Invoke+0x73
RPCRT4!Ndr64StubWorker+0xb0b
RPCRT4!NdrServerCallAll+0x3c
RPCRT4!DispatchToStubInCNoAvrf+0x18
RPCRT4!RPC_INTERFACE::DispatchToStubWorker+0x1a6
RPCRT4!RPC_INTERFACE::DispatchToStub+0xf8
RPCRT4!LRPC_SCALL::DispatchRequest+0x31f
RPCRT4!LRPC_SCALL::HandleRequest+0x7f8
RPCRT4!LRPC_ADDRESS::HandleRequest+0x341
RPCRT4!LRPC_ADDRESS::ProcessIO+0x89e
RPCRT4!LrpcIoComplete+0xc2
ntdll!TppAlpcpExecuteCallback+0x260
ntdll!TppWorkerThread+0x456
KERNEL32!BaseThreadInitThunk+0x14
ntdll!RtlUserThreadStart+0x21

[ybendito]

I suggest to zip the dump file and share with us, you can send a link to ybendito at redhat.com

[ybendito]

It is hard to understand what happens with the network stack as you use unknown release of netkvm driver (virtio-net for Windows). The driver is not one released to public by Red Hat or Fedora (something from Apr 28 2019). If you have a netkvm.pdb for this driver, please provide one, probably we can obtain more info from the same dump file. You also have a lot of 3 rd party networking components, which may affect dhcp renew flow. mm152 is something from Feb 2017, outdated enough. We do not have any specific info about Huawei Cloud (the hypervisor looks like Open Shift / Nova, so probably it may have more updated official drivers in Windows Update).

[cheewill]

Sorry，I don't have pdb。but I known the netkvm driver base on branch kvm-guest-drivers-windows-mm152

[YanVugenfirer]

@cheewill Please check with the latest drivers.