[Xen-API] xenserver-core tech preview: Hang during pygrub

[John Morris <john@xxxxxxxxxxx>]

This problem crops up occasionally when booting a vm.  I haven't figured
out how to repeat it.

Host is Scientific Linux 6; technology preview plus snapshot
repositories; 64-bit Phenom; ceph 0.67.4 from ceph.com repos.

During an 'xe vm-start', pygrub attaches a vm's root vdi in the dom0.
The operation never gets as far as detaching them, and the device
entries remain in /dev/xvd*.  The 'vm-start' never completes, and other
xe commands may or may not work properly afterwards.

Attempting to mount a /dev/xvd* entry will hang with a kernel oops, and
the mount process cannot be killed.

Pasted below are relevant logs.

        John

If the below is illegible, see this link:
  http://pastebin.ca/2472031

/var/log/messages:

Oct 27 21:19:58 xen1 kernel: blkfront: xvdb: barrier: enabled
Oct 27 21:19:58 xen1 kernel: xvdb: xvdb1 xvdb2
Oct 27 21:19:59 xen1 kernel: vbd vbd-51728: 16 Device in use; refusing
to close
Oct 27 21:19:59 xen1 kernel: qemu-system-i38[2899]: segfault at
7fac042e4000 ip 00007fac0447b129 sp 00007fffe7028630 error 4 in
qemu-system-i386[7fac042ed000+309000]
Oct 27 21:20:12 xen1 kernel: xapi15: port 1(eth1.81) entered forwarding
state
Oct 27 21:20:52 xen1 xapi: [ info|xen1.zultron.com|363 UNIX
/var/lib/xcp/xapi||cli] xe osd password=null lspools= username=root
Oct 27 21:21:42 xen1 xapi: [ info|xen1.zultron.com|365 UNIX
/var/lib/xcp/xapi|session.login_with_password D:fd591f08855d|xapi]
Session.create trackid=93881075440eba708422d0109c7e4aa7 pool=false
uname=root originator=cli is_local_superuser=true auth_user_sid=
parent=trackid=9834f5af41c964e225f24279aefe4e49
Oct 27 21:21:42 xen1 xapi: [ info|xen1.zultron.com|365 UNIX
/var/lib/xcp/xapi|session.logout D:a573674c2654|xapi] Session.destroy
trackid=93881075440eba708422d0109c7e4aa7
Oct 27 21:22:58 xen1 udevd[585]: worker [5514] unexpectedly returned
with status 0x0100
Oct 27 21:22:58 xen1 udevd[585]: worker [5514] failed while handling
'/devices/vbd-51728/block/xvdb'


/var/log/debug:

Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Processing disk
SR=6afd1b62-1c4f-7898-5511-5cc0969a0da9 VDI=cf5/prov0.root.img
Oct 27 21:19:57 xen27 xenopsd-xenlight: [scheduler] Scheduler sleep
until 1382926825 (another 27 seconds)
Oct 27 21:19:57 xen27 xenopsd-xenlight: [scheduler] Scheduler sleep
until 1382926825 (another 27 seconds)
Oct 27 21:19:57 xen27 xapi: [ info|xen27.zultron.com|359||storage_impl]
VDI.attach dbg:attach_and_activate dp:xenopsd/task/2
sr:6afd1b62-1c4f-7898-5511-5cc0969a0da9 vdi:cf5/prov0.root.img
read_write:false
Oct 27 21:19:57 xen27 xapi: [debug|xen27.zultron.com|359||storage_impl]
dbg:attach_and_activate dp:xenopsd/task/2
sr:6afd1b62-1c4f-7898-5511-5cc0969a0da9 vdi:cf5/prov0.root.img
superstate:attached  RO
Oct 27 21:19:57 xen27 xapi: [ info|xen27.zultron.com|360||storage_impl]
VDI.activate dbg:attach_and_activate dp:xenopsd/task/2
sr:6afd1b62-1c4f-7898-5511-5cc0969a0da9 vdi:cf5/prov0.root.img
Oct 27 21:19:57 xen27 xapi: [debug|xen27.zultron.com|360||storage_impl]
dbg:attach_and_activate dp:xenopsd/task/2
sr:6afd1b62-1c4f-7898-5511-5cc0969a0da9 vdi:cf5/prov0.root.img
superstate:activated RO
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Device.Vbd.add
(device_number=Xen(1, 0) | params=rbd:cf5/prov0.root.img | phystype=phys)
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] adding device
B0[/local/domain/0/backend/qdisk/0/51728]
F0[/local/domain/0/device/vbd/51728]  H[/xapi/0/hotplug/qdisk/51728]
Oct 27 21:19:57 xen27 xenopsd-xenlight: [hotplug] Hotplug.wait_for_plug:
frontend (domid=0 | kind=vbd | devid=51728); backend (domid=0 |
kind=qdisk | devid=51728)
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Adding watches for:
frontend (domid=0 | kind=vbd | devid=51728); backend (domid=0 |
kind=qdisk | devid=51728)
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] xenstore watch
/local/domain/0/backend/qdisk/0/51728/kthread-pid
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] xenstore watch
/local/domain/0/backend/qdisk/0/51728/tapdisk-pid
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] xenstore watch
/local/domain/0/backend/qdisk/0/51728/shutdown-done
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] xenstore watch
/local/domain/0/backend/qdisk/0/51728/params
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Watch on backend domid:
0 kind: qdisk -> frontend domid: 0 devid: 51728
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Unknown device kind:
'qdisk'
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Watch on backend domid:
0 kind: qdisk -> frontend domid: 0 devid: 51728
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Unknown device kind:
'qdisk'
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Watch on backend domid:
0 kind: qdisk -> frontend domid: 0 devid: 51728
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Unknown device kind:
'qdisk'
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Watch on backend domid:
0 kind: qdisk -> frontend domid: 0 devid: 51728
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Unknown device kind:
'qdisk'
Oct 27 21:19:57 xen27 xenopsd-xenlight: [scheduler] Scheduler sleep
until 1382926825 (another 27 seconds)
Oct 27 21:19:57 xen27 xenopsd-xenlight: [hotplug] Synchronised ok with
hotplug script: frontend (domid=0 | kind=vbd | devid=51728); backend
(domid=0 | kind=qdisk | devid=51728)
Oct 27 21:19:57 xen27 xenopsd-xenlight: [hotplug] Checking to see
whether /local/domain/0/backend/qdisk/0/51728/hotplug-status
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Device.Vbd successfully
added; device_is_online = true
Oct 27 21:19:57 xen27 xenopsd-xenlight: [xenops] Waiting for /dev/xvdb
to appear
Oct 27 21:19:58 xen27 kernel: blkfront: xvdb: barrier: enabled
Oct 27 21:19:58 xen27 xenopsd-xenlight: [bootloader] Bootloader
commandline: /usr/bin/pygrub -q /dev/xvdb
Oct 27 21:19:58 xen27 kernel: xvdb: xvdb1 xvdb2
Oct 27 21:19:59 xen27 xenopsd-xenlight: [xenops] xenstore-write
/local/domain/0/backend/qdisk/0/51728/online = 0
Oct 27 21:19:59 xen27 xenopsd-xenlight: [xenops] Device.del_device
setting backend to Closing
Oct 27 21:19:59 xen27 xenopsd-xenlight: [xenops]
Device.Generic.clean_shutdown_wait frontend (domid=0 | kind=vbd |
devid=51728); backend (domid=0 | kind=qdisk | devid=51728)
Oct 27 21:19:59 xen27 kernel: vbd vbd-51728: 16 Device in use; refusing
to close
Oct 27 21:19:59 xen27 xenopsd-xenlight: [xenops] waiting for backend to
close
Oct 27 21:19:59 xen27 kernel: qemu-system-i38[2899]: segfault at
7fac042e4000 ip 00007fac0447b129 sp 00007fffe7028630 error 4 in
qemu-system-i386[7fac042ed000+309000]
Oct 27 21:20:01 xen27 CROND[10982]: (root) CMD (/usr/lib64/sa/sa1 1 1)


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