On 19/03/2018 18:20, Tim Shearer wrote: > Not sure I understand. CONFIG_KVM_GUEST is enabled: > CONFIG_KVM_GUEST=y > > Yep, it's an old kernel. It's used as a testbed for throughput > performance, that's how we noticed it was broken with the 4.14 host. > However, I then discovered that a third-party router VM based on the > 4.9 (IIRC) kernel behaved in a similar manner. But port 0x80 should not be used if CONFIG_KVM_GUEST=y. What driver is running in the guest, is it something that is distributed with CentOS? Also, I see that your trace has RIP values 0x483213 and 0x483215, can you identify the corresponding source code? Paolo
