Bug 851874
| Summary: | networking halts when mirred target device disappears | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Dan Kenigsberg <danken> |
| Component: | kernel | Assignee: | Red Hat Kernel Manager <kernel-mgr> |
| Status: | CLOSED DUPLICATE | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 6.3 | CC: | gcheresh, jasowang, lpeer, mavital |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | network | ||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2012-08-27 11:27:04 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Description of problem: Host is configured with eth0 connected to a bridge, the latter carrying an IP address. tc ingress rules on the bridge mirror all IP traffic to the tap device associated with a vNIC of qemu-kvm guest. When qemu dies, the tap device is removed, and host connectivity is lost. On 08/15/2012 09:25 AM, Jason Wang wrote: > Unfortunately, current kernel would drop packet when the mirred device > is removed. It depends on the management to do the correct configuration > to make things work I think. Vdsm or other mgmt should take care of the > filter configuration. Maybe we can change the behavior but I'm not sure > whether or not it would break anything. Version-Release number of selected component (if applicable): 2.6.32-279.5.2.el6.x86_64 How reproducible: Ask Genadi for exact probability. Steps to Reproduce: - brctl addbr ovirtmgmt - brctl addif ovirtmgmt eth0 - ifconfig ovirtmgmt host.ip.add.ress - start qemu with a tap device called vnet0 - /sbin/tc qdisc add dev ovirtmgmt ingress - /sbin/tc filter add dev ovirtmgmt parent ffff: protocol ip u32 match u8 0 0 action mirred egress mirror dev vnet0 - /sbin/tc qdisc add dev ovirtmgmt parent root prio - /sbin/tc qdisc show dev ovirtmgmt - /sbin/tc filter add dev ovirtmgmt parent <prio_qdisc_id>: protocol ip u32 match u8 0 0 action mirred egress mirror dev vnet0 traffic is now mirred into the VM. - kill the VM (may happen due to qemu bugs) Actual results: - host looses connectivity Expected results: - host continues to see incoming traffic. Filter to a no-longer-existing device is ignored, not blocking packets.