https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236999
Bug ID: 236999
Summary: vmx driver stops sending network packets and resets
connections (TCP) but allows ICMP
Product: Base System
Version: CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: msh...@daemon-security.com
Tested on 13-CURRENT, with a FreeBSD VM running under ESXi (not sure the
versions, I actually do not have console access at this point).
I did an upgrade from 12-ALPHA4 something to 13-CURRENT and after this was
completed, users were unable to download files over 1MB from this server. I
verified that I could SSH into this system and navigate the simple website that
was serving files, but whenever I tried to download a 40MB file, the transfer
would stop, the connection would reset.
I verified the same thing was happening with SFTP, navigate to the file,
everything worked, but start the transfer, connection reset.
I enabled ICMP to be able to ping this system continuously, and noticed nothing
was dropping out, and verified nothing else was going on (that I am aware of)
with any type of security device, packet shaping, etc.
But with ICMP working fine while TCP connections were reset, I went to look at
NIC offloading features, and all of them were turned on.
Running the following to disable all of it with the vmx driver, and all of the
problems went away, file transfers started to work:
ifconfig vmx0 -rxcsum -txcsum -tso4 -tso6 -lro -rxcsum6 -txcsum6 -vlanhwcsum
-vlanhwtso
I tried flipping each one off and on trying to see it was one particular
option, and it appears TSO4/TSO6 is where the problems resides
vmx0@pci0:3:0:0: class=0x020000 card=0x07b015ad chip=0x07b015ad rev=0x01
hdr=0x00
vendor = 'VMware'
device = 'VMXNET3 Ethernet Controller'
class = network
subclass = ethernet
[1] Hypervisor: Origin = "VMwareVMware"
[1] vmx0: <VMware VMXNET3 Ethernet Adapter> port 0x4000-0x400f mem
0xfd5fc000-0xfd5fcfff,0xfd5fd000-0xfd5fdfff,0xfd5fe000-0xfd5fffff irq 18 at
device 0.0 on pci3
[1] vmx0: <VMware VMXNET3 Ethernet Adapter> port 0x4000-0x400f mem
0xfd5fc000-0xfd5fcfff,0xfd5fd000-0xfd5fdfff,0xfd5fe000-0xfd5fffff irq 18 at
device 0.0 on pci3
[1] vmx0: Using 512 tx descriptors and 256 rx descriptors
[1] vmx0: Using 2 rx queues 2 tx queues
[1] vmx0: failed to allocate 3 MSI-X vectors, err: 6 - using MSI
[1] vmx0: Using an MSI interrupt
[1] vmx0: Ethernet address: 00:50:56:8f:25:15
[1] vmx0: netmap queues/slots: TX 1/512, RX 1/512
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