Xen project Mailing List

Re: Network driver domain broken

To: Andrea Stevanato <andrea.stevanato@xxxxxxxxxxxxxxx>

From: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Date: Mon, 7 Mar 2022 12:22:12 +0100

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Cc: Jason Andryuk <jandryuk@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "wl@xxxxxxx" <wl@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>

Delivery-date: Mon, 07 Mar 2022 11:22:29 +0000

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List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On Fri, Mar 04, 2022 at 02:46:37PM +0100, Andrea Stevanato wrote: > On 3/4/2022 1:27 PM, Roger Pau Monné wrote: > > On Fri, Mar 04, 2022 at 01:05:55PM +0100, Andrea Stevanato wrote: > > > On 3/4/2022 12:52 PM, Roger Pau Monné wrote: > > > > On Thu, Mar 03, 2022 at 01:08:31PM -0500, Jason Andryuk wrote: > > > > > On Thu, Mar 3, 2022 at 11:34 AM Roger Pau Monné > > > > > <roger.pau@xxxxxxxxxx> wrote: > > > > > > > > > > > > On Thu, Mar 03, 2022 at 05:01:23PM +0100, Andrea Stevanato wrote: > > > > > > > On 03/03/2022 15:54, Andrea Stevanato wrote: > > > > > > > > Hi all, > > > > > > > > > > > > > > > > according to the conversation that I had with royger, > > > > > > > > aa67b97ed34 broke the driver domain support. > > > > > > > > > > > > > > > > What I'm trying to do is to setup networking between guests > > > > > > > > using driver domain. Therefore, the guest (driver) has been > > > > > > > > started with the following cfg. > > > > > > > > > > > > > > > > name = "guest0" > > > > > > > > kernel = "/media/sd-mmcblk0p1/Image" > > > > > > > > ramdisk = "/media/sd-mmcblk0p1/rootfs.cpio.gz" > > > > > > > > extra = "console=hvc0 rdinit=/sbin/init root=/dev/ram0" > > > > > > > > memory = 1024 vcpus = 2 > > > > > > > > driver_domain = 1 > > > > > > > > > > > > > > > > On guest0 I created the bridge, assigned a static IP and > > > > > > > > started the udhcpd on xenbr0 interface. > > > > > > > > While the second guest has been started with the following cfg: > > > > > > > > > > > > > > > > name = "guest1" > > > > > > > > kernel = "/media/sd-mmcblk0p1/Image" > > > > > > > > ramdisk = "/media/sd-mmcblk0p1/rootfs.cpio.gz" > > > > > > > > extra = "console=hvc0 rdinit=/sbin/init root=/dev/ram0" > > > > > > > > memory = 1024 vcpus = 2 > > > > > > > > vcpus = 2 > > > > > > > > vif = [ 'bridge=xenbr0, backend=guest0' ] > > > > > > > > > > > > > > > > Follows the result of strace xl devd: > > > > > > > > > > > > > > > > # strace xl devd > > > > > > > > execve("/usr/sbin/xl", ["xl", "devd"], 0xffffdf0420c8 /* 13 > > > > > > > > vars */) = 0 > > > > > > > > > > > > > ioctl(5, _IOC(_IOC_NONE, 0x50, 0, 0x30), 0xffffe6e41b40) = -1 > > > > > > > > EPERM (Operation not permitted) > > > > > > > > write(2, "libxl: ", 7libxl: ) = 7 > > > > > > > > write(2, "error: ", 7error: ) = 7 > > > > > > > > write(2, "libxl_utils.c:820:libxl_cpu_bitm"..., > > > > > > > > 87libxl_utils.c:820:libxl_cpu_bitmap_alloc: failed to retrieve > > > > > > > > the maximum number of cpus) = 87 > > > > > > > > write(2, "\n", 1 > > > > > > > > ) = 1 > > > > > > > > clone(child_stack=NULL, > > > > > > > > flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, > > > > > > > > child_tidptr=0xffff9ee7a0e0) = 814 > > > > > > > > wait4(814, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = > > > > > > > > 814 > > > > > > > > --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=814, > > > > > > > > si_uid=0, si_status=0, si_utime=2, si_stime=2} --- > > > > > > > > > > xl devd is daemonizing, but strace is only following the first > > > > > process. Use `strace xl devd -F` to prevent the daemonizing (or > > > > > `strace -f xl devd` to follow children). > > > > > > > > Or as a first step try to see what kind of messages you get from `xl > > > > devd -F` when trying to attach a device using the driver domain. > > > > > > Nothing has changed. On guest0 (the driver domain): > > > > > > # xl devd -F > > > libxl: error: libxl_utils.c:820:libxl_cpu_bitmap_alloc: failed to retrieve > > > the maximum number of cpus > > > libxl: error: libxl_utils.c:820:libxl_cpu_bitmap_alloc: failed to retrieve > > > the maximum number of cpus > > > libxl: error: libxl_utils.c:820:libxl_cpu_bitmap_alloc: failed to retrieve > > > the maximum number of cpus > > > [ 696.805619] xenbr0: port 1(vif2.0) entered blocking state > > > [ 696.810334] xenbr0: port 1(vif2.0) entered disabled state > > > [ 696.824518] device vif2.0 entered promiscuous mode > > > > Can you use `xl -vvv devd -F` here? > > # xl -vvv devd -F > libxl: error: libxl_utils.c:820:libxl_cpu_bitmap_alloc: failed to retrieve > the maximum number of cpus > libxl: error: libxl_utils.c:820:libxl_cpu_bitmap_alloc: failed to retrieve > the maximum number of cpus > libxl: error: libxl_utils.c:820:libxl_cpu_bitmap_alloc: failed to retrieve > the maximum number of cpus > libxl: debug: libxl_device.c:1749:libxl_device_events_handler: ao > 0xaaaaece52130: create: how=(nil) callback=(nil) poller=0xaaaaece52430 > libxl: debug: libxl_event.c:813:libxl__ev_xswatch_register: watch > w=0xffffe628caf8 wpath=/local/domain/1/backend token=3/0: register slotnum=3 > libxl: debug: libxl_device.c:1806:libxl_device_events_handler: ao > 0xaaaaece52130: inprogress: poller=0xaaaaece52430, flags=i > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event epath=/local/domain/1/backend > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece51b90: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece51b90: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0 > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece4e7b0: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece4e7b0: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2 > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece4e990: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece4e990: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/frontend > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece4eaa0: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece4eaa0: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/frontend-id > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece4ebb0: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece4ebb0: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/online > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece52830: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_device.c:1714:backend_watch_callback: Domain 2:Added > domain to the list of active guests > libxl: debug: libxl_device.c:1569:add_device: Domain 2:Added device > /local/domain/1/backend/vif/2/0 to the list of active devices > libxl: debug: libxl_event.c:813:libxl__ev_xswatch_register: watch > w=0xaaaaece52a10 wpath=/local/domain/1/backend/vif/2/0/state token=2/1: > register slotnum=2 > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/state > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece52d50: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/script > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece52f30: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece52f30: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/mac > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/bridge > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/handle > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/type > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-sg > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-gso-tcpv4 > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-gso-tcpv6 > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-ipv6-csum-offload > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-rx-copy > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-xdp-headroom > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-rx-flip > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-multicast-control > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-dynamic-multicast-control > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-split-event-channels > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/multi-queue-max-queues > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-ctrl-ring > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-sg > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0 > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-gso-tcpv4 > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-gso-tcpv6 > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-ipv6-csum-offload > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-rx-copy > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-xdp-headroom > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-rx-flip > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-multicast-control > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-dynamic-multicast-control > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-split-event-channels > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/multi-queue-max-queues > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/feature-ctrl-ring > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:2035:libxl__ao__destroy: ao 0xaaaaece53110: > destroy > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xffffe628caf8 > wpath=/local/domain/1/backend token=3/0: event > epath=/local/domain/1/backend/vif/2/0/state > libxl: debug: libxl_event.c:2445:libxl__nested_ao_create: ao 0xaaaaece53110: > nested ao, parent 0xaaaaece52130 > libxl: debug: libxl_event.c:750:watchfd_callback: watch w=0xaaaaece52a10 > wpath=/local/domain/1/backend/vif/2/0/state token=2/1: event > epath=/local/domain/1/backend/vif/2/0/state > libxl: debug: libxl_event.c:1055:devstate_callback: backend > /local/domain/1/backend/vif/2/0/state wanted state 2 still waiting state 5 There's something wrong with the negotiation between the frontend and the backend AFAICT. The backed switches to state 5 and 6 (Closed) so the connection cannot be established. Can you paste the output of `xenstore-ls -fp` from dom0 after `xl devd` reports the timeout? What OS/versions are you using for the guest and the driver domain, do you have any local modifications? Regards, Roger.

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