Hello,
with the current qemu-kvm release candidate our diskless linux guests
cannot use their NFS root filesystem anymore.
/usr/local/bin/qemu-system-x86_64 -m 4096 -smp 1 -boot n -net
nic,macaddr=00:50:56:24:0b:57,model=rtl8139 -net
tap,ifname=vm01,script=no,downscript=no
This boots via the pxe-rtl8139.bin Boot ROM and starts a
locally-developed diskless boot environment. (Unfortunately I'm not
able to describe this in detail, and I didn't manage to reproduce this
in an easier environment.) When this boot environment tries to mount
the new root filesystem via NFS, these message appear, waiting
severeal seconds between each line:
nfs: server 172.31.11.10 not responding, still trying
nfs: server 172.31.11.10 OK
This continues until I kill the qemu process. During this problem the
guests IP address can be pinged.
The problem disappears with each of these:
- qemu-kvm-0.10.6
- model=virtio or model=e1000
These changes didn't help:
- -no-kvm-irqchip
- -no-kvm-pit
- -no-kvm
- qemu-system-x86_64 instantly coredumps
- qemu-kvm-0.11.0-rc1
My environment:
- Host
- Linux 2.6.31-rc9 x86_64
- kvm kernel components from this kernel
- Dual-Socket AMD Opteron 2347 HE
- Guest
- Linux 2.6.25.9 i686
I tried to watch this with tcpdump. Before the line
"nfs: server 172.31.11.10 OK" it looks like this:
13:45:28.665935 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.665940 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666162 IP 172.31.11.10.948098278 > 172.31.10.11.2049: 112 read [|nfs]
13:45:28.666259 IP 172.31.11.10.964875494 > 172.31.10.11.2049: 112 read [|nfs]
13:45:28.666345 IP 172.31.10.11.2049 > 172.31.11.10.948098278: reply ok 1472
read
13:45:28.666403 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666408 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666412 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666416 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666421 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666464 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666469 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666476 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666482 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666487 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666526 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666532 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666538 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666543 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666549 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666587 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666594 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666599 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666605 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666613 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666622 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666628 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666929 IP 172.31.10.11.2049 > 172.31.11.10.964875494: reply ok 1472
read
13:45:28.666935 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666940 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666944 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666949 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666991 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.666996 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667002 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667008 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667014 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667052 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667058 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667064 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667069 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667075 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667114 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667121 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667128 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667134 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667140 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667160 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667168 IP 172.31.10.11 > 172.31.11.10: udp
13:45:28.667174 IP 172.31.10.11 > 172.31.11.10: udp
and after this line this appears:
13:45:41.261362 IP 172.31.11.10 > 172.31.10.11: ICMP ip reassembly time
exceeded, length 556
13:45:41.682275 IP 172.31.11.10 > 172.31.10.11: ICMP ip reassembly time
exceeded, length 556
13:45:42.091219 IP 172.31.11.10 > 172.31.10.11: ICMP ip reassembly time
exceeded, length 556
13:45:42.942096 IP 172.31.11.10 > 172.31.10.11: ICMP ip reassembly time
exceeded, length 556
13:45:46.260603 arp who-has 172.31.10.11 tell 172.31.11.10
13:45:46.260756 arp reply 172.31.10.11 is-at 00:c0:9f:ca:9a:78
13:45:56.507139 IP 172.31.11.10 > 172.31.10.11: ICMP ip reassembly time
exceeded, length 556
13:45:57.207030 IP 172.31.11.10 > 172.31.10.11: ICMP ip reassembly time
exceeded, length 556
13:45:58.688814 IP 172.31.11.10 > 172.31.10.11: ICMP ip reassembly time
exceeded, length 556
Thats all informatiion I extracted for now.
If needed I would try to provide additional information or run some
tests.
Thanks,
Sven
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