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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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