Re: [Xen-users] xen_blkbk times out before getting connected

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On 03/02/13 03:07, Yathindra wrote:
> Hi,
> 
> When ever I start a guest domain, backend driver times out since state 
> is not being connected. How do we debug such issues ?
> I instrumented the backend drivers, specifically 
> xen/xenbus/xenbus_probe.c and xen/xenbus/xenbus_probe_backend.c to see
> if the backend fails to probe the device. But I never saw any of the 
> messages I added in syslog or dmesg. I'm stuck on this problem
> for weeks now. I'm not understanding why the backend fails to switch the 
> state.

Are you restarting the xenstore daemon? Also could you please post your
kernel version?

Did you get any messages from the kernel when you try to plug the device?

> Heres the libxl log:
> 
> libxl: debug: libxl_device.c:313:libxl__device_disk_set_backend: Disk 
> vdev=sda1 spec.backend=unknown
> libxl: debug: libxl_device.c:349:libxl__device_disk_set_backend: Disk 
> vdev=sda1, using backend phy
> libxl: debug: libxl_create.c:821:initiate_domain_create: running bootloader
> libxl: debug: libxl_bootloader.c:327:libxl__bootloader_run: no 
> bootloader configured, using user supplied kernel
> libxl: debug: libxl_event.c:561:libxl__ev_xswatch_deregister: watch 
> w=0xc3a5e0: deregister unregistered
> libxl: debug: libxl_numa.c:435:libxl__get_numa_candidate: New best NUMA 
> placement candidate found: nr_nodes=1, nr_cpus=2, nr_vcpus=3, free_memkb=997
> libxl: detail: libxl_dom.c:192:numa_place_domain: NUMA placement 
> candidate with 1 nodes, 2 cpus and 997 KB free selected
> domainbuilder: detail: xc_dom_allocate: 
> cmdline="root=/dev/disk/by-path/xen-vbd-2049 ro xencons=tty", 
> features="(null)"
> libxl: debug: libxl_dom.c:393:libxl__build_pv: pv kernel mapped 0 path 
> /boot/vmlinuz-3.2.16
> ...
> ...
> libxl: debug: libxl_event.c:512:libxl__ev_xswatch_register: watch 
> w=0xc3bd98 wpath=/local/domain/0/backend/vbd/1/2049/state token=3/0: 
> register slotnum=3
> libxl: debug: libxl_create.c:1330:do_domain_create: ao 0xc39880: 
> inprogress: poller=0xc398e0, flags=i
> libxl: debug: libxl_event.c:457:watchfd_callback: watch w=0xc3bd98 
> wpath=/local/domain/0/backend/vbd/1/2049/state token=3/0: event 
> epath=/local/domain/0/backend/vbd/1/2049/state
> libxl: debug: libxl_event.c:600:devstate_watch_callback: backend 
> /local/domain/0/backend/vbd/1/2049/state wanted state 2 still waiting 
> state 1
> libxl: debug: libxl_event.c:614:devstate_timeout: backend 
> /local/domain/0/backend/vbd/1/2049/state wanted state 2  timed out
> libxl: debug: libxl_event.c:549:libxl__ev_xswatch_deregister: watch 
> w=0xc3bd98 wpath=/local/domain/0/backend/vbd/1/2049/state token=3/0: 
> deregister slotnum=3
> libxl: debug: libxl_event.c:561:libxl__ev_xswatch_deregister: watch 
> w=0xc3bd98: deregister unregistered
> libxl: error: libxl_device.c:943:device_backend_callback: unable to 
> connect device with path /local/domain/0/backend/vbd/1/2049
> libxl: error: libxl_create.c:1077:domcreate_launch_dm: unable to add 
> disk devices
> libxl: debug: libxl_event.c:512:libxl__ev_xswatch_register: watch 
> w=0xc3d868 wpath=/local/domain/0/backend/vbd/1/2049/state token=3/1: 
> register slotnum=3
> libxl: debug: libxl_event.c:457:watchfd_callback: watch w=0xc3d868 
> wpath=/local/domain/0/backend/vbd/1/2049/state token=3/1: event 
> epath=/local/domain/0/backend/vbd/1/2049/state
> libxl: debug: libxl_event.c:600:devstate_watch_callback: backend 
> /local/domain/0/backend/vbd/1/2049/state wanted state 6 still waiting 
> state 5
> libxl: debug: libxl_event.c:614:devstate_timeout: backend 
> /local/domain/0/backend/vbd/1/2049/state wanted state 6  timed out
> libxl: debug: libxl_event.c:549:libxl__ev_xswatch_deregister: watch 
> w=0xc3d868 wpath=/local/domain/0/backend/vbd/1/2049/state token=3/1: 
> deregister slotnum=3
> libxl: debug: libxl_event.c:561:libxl__ev_xswatch_deregister: watch 
> w=0xc3d868: deregister unregistered
> libxl: error: libxl_device.c:943:device_backend_callback: unable to 
> disconnect device with path /local/domain/0/backend/vbd/1/2049
> libxl: error: libxl.c:1725:devices_destroy_cb: libxl__devices_destroy 
> failed for 1
> libxl: debug: libxl_event.c:1497:libxl__ao_complete: ao 0xc39880: 
> complete, rc=-3
> libxl: debug: libxl_event.c:1469:libxl__ao__destroy: ao 0xc39880: destroy
> xc: debug: hypercall buffer: total allocations:366 total releases:366
> xc: debug: hypercall buffer: current allocations:0 maximum allocations:4
> xc: debug: hypercall buffer: cache current size:4
> xc: debug: hypercall buffer: cache hits:356 misses:4 toobig:6
> 
> Thanks,
> Yathi
> 
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> 


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