Description of problem: Doing a large rsync-over-ssh from a RHEL 5 KVM guest (running on F12 beta) to a physical host elsewhere on my network results in a "Corrupted MAC on input." error message from ssh, which means data inside the TCP stream got corrupted. Worse still, the packet checksum on the packet with the corrupted data is correct, because the packet did not get dropped by the receiving host. This suggests that the packet gets corrupted in-between the time the host receives the packet from the guest and the time the NIC calculates the packet's checksum. Disabling checksum offload on the host makes the corruption go away. Possibly this is because the checksum gets calculated earlier, before the window during which packets get corrupted. Of course, I do not know the network code all that well so I may be wrong :) Version-Release number of selected component (if applicable): 2.6.31.1-56.fc12.x86_64 Steps to Reproduce: 1. run a RHEL 5 KVM guest on F12 beta 2. do a gigantic rsync-over-ssh from the guest to an outside system 3. wait for ssh error message Additional info: The NIC on my host is the following, which uses the tg3 driver: 05:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5761 Gigabit Ethernet PCIe (rev 10)
So far it looks like the problem only happens with ipv6 packets. I will keep running the test today to make sure of this.
OK, so far I have this info: ipv4 => no problem ipv6 w/ tso => data corruption ipv6 w/o tso => no problem It looks like either the NIC or the network driver has issues with ipv6 and TSO.
I have reported the bug upstream: http://lkml.org/lkml/2009/10/28/189
It's a long shot, but can you try this scratch build when/if it finishes? There is a fix for a TSO bug in it: http://koji.fedoraproject.org/koji/taskinfo?taskID=1782682
Created attachment 367852 [details] tg3: Enable IPv6 LSO offload in hardware This patch enables hardware IPv6 LSO offload support for the 5761 and 5717. Does this patch fix the problem?
This bug appears to have been reported against 'rawhide' during the Fedora 13 development cycle. Changing version to '13'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
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Fedora 13 changed to end-of-life (EOL) status on 2011-06-25. Fedora 13 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.