Re: [kvm-ppc-devel] guest panic fixed

[Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>]

Hollis Blanchard wrote:
> Thanks to some excellent debugging by Christian, we found the cause of
> our annoying guest panics. We had not implemented exception priorities
> (my bad), so a userspace ITLB miss was being delivered immediately after
> entry to the decrementer interrupt vector. Patch follows,
> http://penguinppc.org/~hollisb/kvm/ updated.
> 
> NFS root with virtio-net still doesn't work for me, but it doesn't
> crash. :)
> 

my network works fine (at least initially) see the attached log:

Sending DHCP requests .., OK
IP-Config: Got DHCP answer from 192.168.1.2, my address is 192.168.1.10
IP-Config: Complete:
     device=eth0, addr\x192.168.1.10, mask%5.255.255.0, gw\x192.168.1.2,
     host\x192.168.1.10, domain=local-devnet, nis-domain=(none),
     bootserver\x192.168.1.2, rootserver\x192.168.1.2, rootpathLooking up port of RPC 100003/2 on 192.168.1.2
Looking up port of RPC 100005/1 on 192.168.1.2
VFS: Mounted root (nfs filesystem).
Freeing unused kernel memory: 116k init
modprobe: FATAL: Could not load /lib/modules/2.6.25-rc3-dirty/modules.dep: No such file or directory
modprobe: FATAL: Could not load /lib/modules/2.6.25-rc3-dirty/modules.dep: No such file or directory
INIT: version 2.85 booting
nfs: server 192.168.1.2 not responding, still trying
nfs: server 192.168.1.2 not responding, still trying
nfs: server 192.168.1.2 not responding, still trying
INFO: task rc.sysinit:679 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.


After that I run into those lockup's for init:1 and rc.sysinit:679. 
The network is working fine for a while and then that I get these nfs timeouts you see above.
I think thats the track I will continue - find out whats wrong there e.g. virtio mangles the packets, too high latency, lost virtio interrupts, ... whatever.

@Hollis let me know if I can help you with your nfs root setup somehow?

-- 

Grüsse / regards, 
Christian Ehrhardt
IBM Linux Technology Center, Open Virtualization

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