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Re: [Xen-devel] vif's disappear after dom1 reboot

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] vif's disappear after dom1 reboot
From: Wensheng Wang <wenshengwang@xxxxxxxxx>
Date: Fri, 6 Jan 2006 14:36:38 -0600
Delivery-date: Fri, 06 Jan 2006 20:42:14 +0000
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So nobody experienced this bug?

I'd like to add some more info I just found.
I can now reliably reproduce this bug with only 2 domainU's

Rebooting dom 1 will disable vif1?.0 (like vif11.0 vif12.0 vif13.0
...); rebooting dom2 will disable vif2?.0, rebooting dom3 will disable

To reproduce, prepare 2 lvm for guest domain for example
/dev/vg0/breezy and /dev/vg0/sarge
Their config files are in /etc/xen/auto/breezy and /etc/xen/auto/sarge

Bring one guest domain up first, it will have a domain id 1
#xm create /etc/xen/auto/breezy

Mount the other lvm to /mnt and create guest domain.  Because lvm is
mounted, domain creation will not be successful, it will be in paused
state. This is purely for incrementing dom id number.
#mount /dev/vg0/sarge /mnt
#for i in `seq 2 10`;do xm create /etc/xen/auto/sarge || xm destroy $i;done

umount that lvm and create that domain, the domain will have id 11
#umount /mnt
#xm create /etc/xen/auto/sarge

Now 2 domainU alive, "brctl show" show vif0.0 vif1.0 vif11.0
#xm list
#brctl show

now reboot domain 1
#xm shutdown -R 1

What should happen is that after this there should be 2 domain with id
11 and 12 using vif11.0 and vif12.0

What actually happen is:
1, there is only one domain: domain 11
2, vif11 dissapeared.
3. there is dangling vif12.0
4, domain 11 dead

here is what I get if I do "xm console 11"
[root@m5 ~]# xm console 11
Unable to handle kernel paging request at virtual address f578ee01
 printing eip:
00560000 -> *pde = 00000001:5d409001
0059e000 -> *pme = 00000001:6c190067
00040000 -> *pte = 00000000:00000000
Oops: 0000 [#1]
Modules linked in:
CPU:    0
EIP:    0061:[<c0110220>]    Not tainted VLI
EFLAGS: 00010086   (
EIP is at send_IPI_mask_bitmask+0x20/0x120
eax: f578ee00   ebx: 00000000   ecx: 00000000   edx: 00000000
esi: 00000000   edi: f578c000   ebp: 00000000   esp: c0586020
ds: 007b   es: 007b   ss: 0069
Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:

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