[Xen-devel] Error with NFS and XEN (High network load)

[Roberto Gonzalez Azevedo <rgonzalez@xxxxxxxxxxxxxxx>]

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Error with NFS and XEN (High network load):

I'm using UDP and 1500 MTU.

On server-side:
(LVM2)
/dev/mapper/vg-web on /web type xfs (rw,nosuid,noatime,quota,usrquota)

On client-side (dom0 or domU):
mount -t nfs -o rsize=8192,wsize=8192,intr,noexec,retry=10 \
server:/web /data/web


On domU machine:
root@domU:# mount -t nfs real-machine-not-xen-or-any-virtual:/mnt /data
[ok]

Crash:
root@domU:# time dd if=/dev/zero of=/data/test.txt bs=16k count=16384
[NOT OK]

My hardware is Dell PowerEdge 1850, network card module e1000.

Here is the crash:
root@dom0:# xm console machine
"
Unable to handle kernel NULL pointer dereference at virtual address 00000115
 printing eip:
*pde = ma 00000000 pa fffff000
Oops: 0002 [#1]
SMP
Modules linked in:
CPU:    0
EIP:    0061:[<c02f9f99>]    Not tainted VLI
EFLAGS: 00010086   (2.6.16.27-xenU_09-08-2006 #3)
EIP is at network_tx_buf_gc+0xdb/0x277
eax: 00000095   ebx: 00000087   ecx: c0508c54   edx: 00000000
esi: c0508380   edi: 00000085   ebp: c0499e98   esp: c0499e70
ds: 007b   es: 007b   ss: 0069
Process swapper (pid: 0, threadinfo=c0498000 task=c0434500)
Stack: <0>c0508c54 00000000 c0498000 c0508000 00026c3f 00026c8b 00026c6e
00000000
       c0508408 c0508380 c0499eac c02fa230 c7d98a40 00000000 00000000
c0499ed4
       c013c911 00000107 c0508000 c0499f3c c0499f3c 00000107 00008380
c048d780
Call Trace:
 [<c0105580>] show_stack_log_lvl+0xb9/0x103
 [<c0105766>] show_registers+0x19c/0x232
 [<c0105a64>] die+0x116/0x233
 [<c01112ca>] do_page_fault+0x4e8/0x8cc
 [<c0104ff7>] error_code+0x2b/0x30
 [<c02fa230>] netif_int+0x29/0x121
 [<c013c911>] handle_IRQ_event+0x3c/0xac
 [<c013ca0d>] __do_IRQ+0x8c/0xef
 [<c0106a62>] do_IRQ+0x1d/0x29
 [<c02ee27b>] evtchn_do_upcall+0x94/0xc8
 [<c0105039>] hypervisor_callback+0x3d/0x48
 [<c010382f>] xen_idle+0x2d/0x53
 [<c01038c0>] cpu_idle+0x6b/0xb6
 [<c0102035>] rest_init+0x35/0x37
 [<c049a4ed>] start_kernel+0x2e7/0x392
 [<c010006f>] 0xc010006f
Code: 89 44 24 04 89 14 24 e8 cf 54 ff ff c7 84 9e d8 08 00 00 00 00 00
00 8b 86 d0 00 00 00 89 84 9e d0 00 00 00 89 9e d0 00 00 00 90 <ff> 8f
90 00 00 00 0f 94 c0 84 c0 75 4e 8b 4e 74 83 45 f0 01 8b
 <0>Kernel panic - not syncing: Fatal exception in interrupt
"

And the domU dies ...

Is it a bug ?

I have reported it in bugzilla as Bug id # 735.

Dom0 crashes using Xen Stable (3.0.2.2).

- --
- ----------------------------
Roberto Gonzalez Azevedo
Tested with:
Xen Stable 3.0.2.2 or Xen Unstable (both crash)
(dom0 = Ubuntu 6.0.6.1 Dapper AND
 dom0 = CentOS 4.3 with official Xen RPMs
 domU = Slackware 10.2)
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