[Xen-users] Strange lockup

[Richard Kojedzinszky <krichy@xxxxxxxxxx>]

Dear users,

We have a ganeti cluster of 3 supermicro X9SCL/X9SCM servers, exactly 
the same hardware. In one we have an additional Intel 10G network card. 
The hosts have a backbone network which is used for drbd and ganeti's 
shared-file-storage nfs share.
For some domUs (instances) we use drbd mirrors. We have an issue with 
planned maintenances:
I migrate all domUs off from a node which is to be upgraded, yet it is 
still a slave for some domUs disks'.
When the host has no more running domUs, I issue a reboot on it. After 
it, on the other node, the network card stops working, the kernel shows 
'tx hangs', and effectively I cannot recover that dom0 also without a 
reboot.
I've attached a syslog from a node which has the 10G nic after a reboot 
has been initiated on another node.
The strange is that if I do it the other way around, the same happens, 
but with the e1000e nics.
What kind of bug is this? Maybe when the drbd slave disappears, drbd 
puts a high load on the nic? I dont know any other direct traffic 
between the two hosts on that dedicated network.
Any thoughts?

--
Richard Kojedzinszky

Attachment: lockup-syslog.txt
Description: Text document

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