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xen-users
[Xen-users] problems using domu as network backend domain (fedora 7)
Hello,
want to make a network setting where a domu acts as a network backend domain (domu1). But the start of another domu (domu2) with its backend directed to domu1 causes a kernel bug at domu1.
The bug occurs in the netback/interface.c file.
Anyhow the vif of domu2 is created correctly and visible via ifconfig in domu1. No errors visible in the xen log files. But after configuring correct ip and mac addresses no connection can be established between both domus.
I think the bug occurs when the domu1 tries to map the frontend pages of domu2 into its address space. Maybe domu1 is not privileged enough for the operation.
Does anyone have the same problems? Any help appreciated.
Thank you. Regards Fannys
fedora xen version: 2.6.21-6.fc7xen
domu1 config file: bootloader = "/usr/bin/pygrub" memory = 1024 name = "domu1" vcpus = 1
netif = "yes" vif = [ 'mac=00:16:3e:26:96:d6,bridge=eth0,script=vif-bridge'] vnc = 1 disk = [ 'tap:aio:/var/lib/xen/images/xenshare/domu1.img,xvda,w']
domu2 config file:
bootloader = "/usr/bin/pygrub" memory = 1024 name = "domu2" vcpus = 1 vif = [ 'mac=00:16:3e:26:96:d7, backend=domu1, script=vif-nothing'] vnc = 1 disk = [ 'tap:aio:/var/lib/xen/images/xenshare/domu2.img,xvda,w']
my steps: starting domu1, doing modprobe netbk, (backend of domu1 is domain-0) starting domu2 (backend of domu2 is domu1)
Bug occurs in the netback/interface.c file in method map_frontend_pages on calling HYPERVISOR_grant_table_op(..)
eth0: no IPv6 routers present ------------[ cut here ]------------ kernel BUG at drivers/xen/netback/interface.c:204! invalid opcode: 0000 [#1] SMP last sysfs file: /class/net/vif7.0/address Modules linked in: netbk(U) autofs4(U) hidp(U) l2cap(U) bluetooth(U) sunrpc(U) xennet(U) ipv6(U) dm_mirror(U) dm_multipath(U) dm_mod(U) parport_pc(U) lp(U) parport(U) loop(U) pcspkr(U) joydev(U) xenblk(U) ext3(U) jbd(U) mbcache(U) ehci_hcd(U) ohci_hcd(U) uhci_hcd(U)
CPU: 0 EIP: 0061:[<ee3e6c77>] Not tainted VLI EFLAGS: 00010286 (2.6.21-6.fc7xen #1) EIP is at netif_map+0x9f/0x217 [netbk] eax: ffffffff ebx: 00000000 ecx: c23e5ef0 edx: 00000001 esi: ec998480 edi: c23e5ef0 ebp: 00000300 esp: c23e5ee0
ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0069 Process xenwatch (pid: 9, ti=c23e5000 task=ed7c25d0 task.ti=c23e5000) Stack: 00000000 ecdd4a80 00000035 00000301 ee206000 00000000 00000002 00000300 00000007 ecd84c00 ecdd47a4 c11545da 00000009 ecd84c00 ecdd47a4 ee3ea1e8
ee3e629c 00000009 ece5eac0 ee3e70bb ee3e7089 c23e5f60 ee3e7020 ee3e701c Call Trace: [<c11545da>] xenbus_scanf+0x1d/0x53 [<ee3e629c>] frontend_changed+0x348/0x598 [netbk] [<c11553f8>] otherend_changed+0x7b/0x80
[<c1153d6a>] xenwatch_handle_callback+0x12/0x41 [<c1154798>] xenwatch_thread+0xf6/0x10c [<c1153d58>] xenwatch_handle_callback+0x0/0x41 [<c10342a9>] autoremove_wake_function+0x0/0x35
[<c11546a2>] xenwatch_thread+0x0/0x10c [<c10341e0>] kthread+0xb0/0xd8 [<c1034130>] kthread+0x0/0xd8 [<c100598f>] kernel_thread_helper+0x7/0x10 ======================= Code: 89 54 24 14 8d 7c 24 10 31 db 66 89 4c 24 20 ba 01 00 00 00 89 f9 c7 44 24 18 02 00 00 00 89 6c 24 1c e8 0d a6 c1 d2 85 c0 74 04 <0f> 0b eb fe 66 8b 44 24 22 66 85 c0 75 6d 8b 44 24 24 31 d2 89
EIP: [<ee3e6c77>] netif_map+0x9f/0x217 [netbk] SS:ESP 0069:c23e5ee0 vif7.0: no IPv6 routers present Bridge firewalling registered ip_tables: (C) 2000-2006 Netfilter Core Team Netfilter messages via NETLINK v0.30.
nf_conntrack version 0.5.0 (8192 buckets, 65536 max) virbr0: no IPv6 routers present vif7.0: no IPv6 routers present
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