a domain VTx with the VNIF does hang.

[Hirofumi Tsujimura <tsujimura.hirof@jp.fujitsu.com>]

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Hi all, my name is Hirofumi Tsujimura.
We are porting and testing a PV-on-HVM in the IPF.
This is a first time to send mail.

I probably found the problem when I tested the VNIF.
My operation for the test is following.
  1. create a domain VTx and attach the VNIF in it.
  2. create a domain U.
  3. send a packet to the domain VTx from the domain U with ping
     command.
     Then, the domain VTx does hang.
     And, it outputs as follows.
     The domain U and a domain 0 doesn't do hang.

    EAX: c03c7000 EBX: 00000286 ECX: 00000286 EDX: da676000
    ESI: 000004e2 EDI: 0000000a EBP: c03c7fb8 DS: 007b ES: 007b
    CR0: 8005003b CR2: b7ee2044 CR3: 1a6af000 CR4: 000006d0
      [<c0118f92>] __printk_ratelimit+0x8f/0x95
      [<e08a6316>] xennet_get_responses+0xca/0x31c [xen_vnif]
      [<c0103dc2>] do_IRQ+0x70/0x7a
      [<e08a6851>] netif_poll+0x1c/0x60v [xen_vnif]
      [<c0103dc2>] net_rx_action+0x35/0x7d
      [<c011c47d>] __do_softirq+0x38/0x3f
      [<c0103e94>] do_softirq+0x38/0x3f
      =======================
      [<c0103dc2>] do_IRQ+0x70/0x7a
      [<c0102c1a>] common_interrupt+0x27/0x2b
      [<c014b5d8>] kmem_cache_free+0x27/0x2b
      [<c013dac4>] free_pgtables+0x31/0x63
      [<c01421ab>] exit_mmap+0x6a/0xb6
      [<c0115f53>] mmput+0x1f/0x76
      [<c011a58d>] do_exit+0x173/0x32b
      [<c011a7f7>] sys_exit_group+0x0/0xd
      [<c01029f3>] sysenter_past_esp+0x54/0x75
    printk: 64425470 messages suppressed.
    netfront: rx->offset: 0, size: 4294967295
    printk: 64601036 messages suppressed.
    netfront: rx->offset: 0, size: 4294967295
*** Please look at screenshots about the detail of the log. ***

The test environment is as follows.
  - Architecture  : x86
  - Xen change set: 11683
  - Domain 0      : kernel2.6.16.29-xen
  - Domain U      : kernel2.6.16.29-xen
  - Domain VTx    : kernel2.6.16

Probably, a domain VTx with the VNIF does Hang when it recieves a packet
from some domain U or from some domain VTx with the VNIF.


Additionally, I similarly tested the VNIF in the following environments
today(On October 3 2006).
  - Architecture  : x86
  - Xen change set: 11686
  - Domain 0      : kernel2.6.16.29-xen
  - Domain U      : kernel2.6.16.29-xen
  - Domain VTx    : kernel2.6.16

As a result, a kernel of domain VTx with the VNIF does panic when I use
"xm network-attach domainVTx eth1" in a domain 0.
Even if that command succeeds, it similarly does hang when it recieves a
packet.

What's happend?
Thank you.

--
FUJITSU COMPUTER TECHNOLOGIES LIMITED
Development Dept. 5  Division 1
Hirofumi Tsujimura
E-MAIL: tsujimura.hirof@jp.fujitsu.com


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