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xen-devel
[Xen-devel] save/restore/save hangs
Hi,
I have xen 3.4.2 + 2.6.31.5 pv_ops kernel from
http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=shortlog;h=xen/master
running in dom0 and domU. Both dom0 and domU are 64bit in kernels and
userlands.
-----8<----
# xm info
host : host1
release : 2.6.31.5x_xen0nogrsecurity-BL5.3
version : #1 SMP Thu Nov 12 02:43:22 UTC 2009
machine : x86_64
nr_cpus : 2
nr_nodes : 1
cores_per_socket : 1
threads_per_core : 1
cpu_mhz : 2192
hw_caps :
078bf3ff:e1d3fbff:00000000:00000010:00000000:00000000:00000000:00000000
virt_caps :
total_memory : 4031
free_memory : 2052
node_to_cpu : node0:0-1
node_to_memory : node0:2052
xen_major : 3
xen_minor : 4
xen_extra : .2
xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p
xen_scheduler : credit
xen_pagesize : 4096
platform_params : virt_start=0xffff800000000000
xen_changeset : unavailable
cc_compiler : gcc version 4.4.2 20091026 (release) (PLD-Linux)
cc_compile_by :
cc_compile_domain : ics.p.lodz.pl
cc_compile_date : Thu Nov 12 09:31:48 UTC 2009
xend_config_format : 4
-----8<----
When I do save and restore then subsequent save hangs domU:
-----8<----
[root@host1]# xm create /etc/xen/machines/guest4.xen
Using config file "/etc/xen/machines/guest4.xen".
Started domain guets4 (id=3)
[root@host1]# xm list
Name ID Mem VCPUs State
Time(s)
Domain-0 0 3728 2 r----- 688.0
guest4 3 256 1 -b---- 4.1
[root@host1]# xm save 3 /var/tmp/guest4-3.xen-save
[root@host1]# ls -l /var/tmp/*save
-rwxr-xr-x 1 root root 268977193 11-13 00:50 /var/tmp/guest4-3.xen-save
[root@host1]# xm restore /var/tmp/guest4-3.xen-save
[root@host1]# xm list
Name ID Mem VCPUs State
Time(s)
Domain-0 0 3728 2 r----- 701.5
guest4 4 256 1 r----- 45.6
-----8<----
[me@workstation]$ ssh me@guest4
Last login: Fri Nov 13 00:33:07 2009 from grey.cluster.turystyka.com.pl
[me@guest4]$
-----8<----
Now, I try to save the guest again, but only 1,5k data is saved and the guest
hangs:
-----8<----
[root@host1]# xm save 4 /var/tmp/guest4-4.xen-save
Error: /usr/lib64/xen/bin/xc_save 52 4 0 0 0 failed
Usage: xm save [-c] <Domain> <CheckpointFile>
Save a domain state to restore later.
-c, --checkpoint Leave domain running after creating
snapshot
[root@host1]# xm list
Name ID Mem VCPUs State
Time(s)
Domain-0 0 3728 2 r----- 704.3
guest4 4 256 1 -b---- 208.0
[root@host1]# ls -l /var/tmp/*save
-rwxr-xr-x 1 root root 268977193 11-13 00:50 /var/tmp/guest4-3.xen-save
-rwxr-xr-x 1 root root 1558 11-13 00:56 /var/tmp/guest4-4.xen-save
[root@host1]#
-----8<----
I can login to guest neither from console nor from ssh. The only thing I can
do is to destroy it. By the way dom0 seems to be robust: guest save/restore
problems have no impact on dom0 stability.
You can guess how migrate works:
[root@host1]# xm create /etc/xen/machines/guest4.xen
Using config file "/etc/xen/machines/guest4.xen".
Started domain guest4 (id=1)
[root@host1]# xm list
Name ID Mem VCPUs State
Time(s)
Domain-0 0 3728 2 r----- 666.4
guest4 1 256 1 -b---- 4.1
[root@host1]# xm migrate 1 host2
[root@host1]#
-----8<----
[root@host2]# xm list
Name ID Mem VCPUs State
Time(s)
Domain-0 0 909 2 r----- 740.0
guest4 5 256 1 r----- 27.4
[root@host2]# xm console 5
guest4 login:
-----8<----
[me@workstation]$ ssh me@guest4
Last login: Thu Nov 12 16:23:13 2009 from xxxx
[me@guest4]$
-----8<----
Looks excellent until this point, but when I try to migrate guest4 back to
host1 I get:
[root@host2]# xm migrate 5 host1
Error: /usr/lib64/xen/bin/xc_save 52 5 0 0 0 failed
Usage: xm migrate <Domain> <Host>
[---]
-----8<----
[me@workstation]$ ssh me@guest4
ssh: connect to host guest4 port 22: No route to host
[me@workstation]$
-----8<----
These scenarios are 100% reproducible.
When domU hangs during save I get in xend log:
-----8<----
[2009-11-13 00:56:54 3695] DEBUG (XendCheckpoint:110)
[xc_save]: /usr/lib64/xen/bin/xc_save 52 4 0 0 0
[2009-11-13 00:56:54 3695] INFO (XendCheckpoint:417) xc_save: failed to get
the suspend evtchn port
[2009-11-13 00:56:54 3695] DEBUG (XendCheckpoint:388) suspend
[2009-11-13 00:56:54 3695] INFO (XendCheckpoint:417)
[2009-11-13 00:56:54 3695] DEBUG (XendCheckpoint:113) In saveInputHandler
suspend
[2009-11-13 00:56:54 3695] DEBUG (XendCheckpoint:115) Suspending 4 ...
[2009-11-13 00:56:54 3695] DEBUG (XendDomainInfo:511)
XendDomainInfo.shutdown(suspend)
[2009-11-13 00:56:54 3695] DEBUG (XendDomainInfo:1709)
XendDomainInfo.handleShutdownWatch
[2009-11-13 00:56:54 3695] DEBUG (XendDomainInfo:1709)
XendDomainInfo.handleShutdownWatch
[2009-11-13 00:56:54 3695] INFO (XendDomainInfo:1903) Domain has shutdown:
name=migrating-test44 id=4 reason=suspend.
[2009-11-13 00:56:54 3695] INFO (XendCheckpoint:121) Domain 4 suspended.
[2009-11-13 00:56:54 3695] INFO (XendCheckpoint:417) ERROR Internal error:
Frame# in pfn-to-mfn frame list is not in pseudophys
[2009-11-13 00:56:54 3695] INFO (XendCheckpoint:417) ERROR Internal error:
entry 0: p2m_frame_list[0] is 0x2033343af6353a30, max 0xfbff0
[2009-11-13 00:56:55 3695] INFO (XendCheckpoint:417) ERROR Internal error:
Failed to map/save the p2m frame list
[2009-11-13 00:56:55 3695] INFO (XendCheckpoint:417) Save exit rc=1
[2009-11-13 00:56:55 3695] DEBUG (XendCheckpoint:130) Written done
[2009-11-13 00:56:55 3695] ERROR (XendCheckpoint:164) Save failed on domain
test44 (4) - resuming.
Traceback (most recent call last):
File "/usr/lib64/python2.6/site-packages/xen/xend/XendCheckpoint.py", line
132, in save
File "/usr/lib64/python2.6/site-packages/xen/xend/XendCheckpoint.py", line
405, in forkHelper
XendError: /usr/lib64/xen/bin/xc_save 52 4 0 0 0 failed
[2009-11-13 00:56:55 3695] DEBUG (XendDomainInfo:2788)
XendDomainInfo.resumeDomain(4)
[2009-11-13 00:56:55 3695] DEBUG (XendDomainInfo:2829)
XendDomainInfo.resumeDomain: completed
-----8<----
Regards,
--
Bartosz Lis @ Inst. of Information Technology, Technical Univ. of Lodz
bartoszl @ ics.p.lodz.pl
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