virt October 2015

virt@lists.centos.org

18 participants
14 discussions

Kernel oops on the dom0
by Nathan March 06 Oct '15

06 Oct '15

Hi All, One of our developers managed to trigger a kernel oops on a 4.4.2 dom0.. Oops text is attached. He was working on setting up network namespaces / bridging inside a centos domU, had activated the bridge and lost networking (probably config error) so he rebooted the VM. On reboot is when we saw the oops, along with various xen procs hanging: root 23388 0.0 1.6 132796 32264 ? SLsl Oct02 0:04 /usr/sbin/xl create /mnt/xen/gx/xen/metrixc7 root 26119 0.0 0.0 0 0 ? Z Oct02 0:00 \_ [block] <defunct> root 26127 0.0 0.0 0 0 ? Z Oct02 0:00 \_ [block] <defunct> root 26137 0.0 0.0 0 0 ? Z Oct02 0:00 \_ [block] <defunct> root 26157 0.0 0.0 0 0 ? Z Oct02 0:00 \_ [block] <defunct> root 26169 0.0 0.0 0 0 ? Z Oct02 0:00 \_ [block] <defunct> root 26195 0.0 0.0 0 0 ? Z Oct02 0:00 \_ [vif-bridge] <defunct> root 24625 0.0 0.0 0 0 ? Ds Oct02 0:06 [tapdisk] At this point the dom0 is still up and running existing VMs fine, I can also migrate live VMs off of it successfully although the post-migration clean up fails and hangs: libxl: error: libxl_device.c:935:device_backend_callback: unable to remove device with path /local/domain/0/backend/vbd/17/51712 Host is running centos 7 with the 4.4.2-7 package and kernel 3.10.68-11.el6.centos.alt.x86_64. I've also attached xl dmesg. First time I've seen anything like this and not sure if his networking/bridging in the domU is related or just coincidental. Any thoughts / ideas? Going to try to reproduce on a test dom0 later this week, so happy to grab any additional debugging if required. - Nathan

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CentOS 7 AMI on AWS GovCloud region
by Patrick Varilly 03 Oct '15

03 Oct '15

Hi, I'm working on building a cluster on AWS atop CentOS 7. For development, I've been working in the eu-west-1 (Ireland) region, where the AWS MarketPlace provides an official CentOS 7 AMI (ami-e4ff5c93). However, the production deployment is taking place in AWS's GovCloud region for regulatory reasons, and there, I couldn't find an official CentOS 7 AMI. Are there plans to provide an official CentOS 7 AMI for the GovCloud soon? Or instructions on how the official AMIs are built? I'm happy to help build an AMI for public use following the instructions if someone can point me in the right direction. Thanks for your help, -- Patrick Varilly Data Minded http://dataminded.be

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Re: [CentOS-virt] xen and spice problem
by Christoph 01 Oct '15

01 Oct '15

Am 2015-10-01 12:24, schrieb Fabio Fantoni: > > Qemu seems crashed, can you post qemu log of this domU for see the > exact problem? > Also domU's xl cfg can be useful and/or backtrace of qemu crash with > gdb depending on the error of qemu crash. > thats the config of domU: builder = 'hvm' memory = 2048 vcpus=8 boot="c" name = "marax" disk = [ 'phy:/dev/vg_lilith/lv_marax_c,hda,w' ] vif = [ 'bridge=xenbr5,mac=00:16:3e:05:01:10,script=vif-bridge' ] on_poweroff = 'destroy' on_reboot = 'restart' on_crash = 'restart' vnc=0 vga = 'stdvga' spice = 1 spicehost = '0.0.0.0' spiceport = 6000 spicedisable_ticketing=1 spicevdagent=1 spice_clipboard_sharing=1 localtime=1 keymap='de' viridian = 1 where/how I can see the qemu log? -- --------- Greetz

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xen and spice problem
by Christoph 01 Oct '15

01 Oct '15

Hi it is possible to use xen and spice already? If yes is there any howto or doc how? If I turn on spice in cfg of a hvm domU, I get this error: Parsing config from /etc/xen/marax.cfg libxl: detail: libxl_dom.c:238:hvm_set_viridian_features: base group enabled libxl: detail: libxl_dom.c:238:hvm_set_viridian_features: freq group enabled libxl: detail: libxl_dom.c:238:hvm_set_viridian_features: time_ref_count group enabled xc: detail: elf_parse_binary: phdr: paddr=0x100000 memsz=0xbad04 xc: detail: elf_parse_binary: memory: 0x100000 -> 0x1bad04 xc: detail: VIRTUAL MEMORY ARRANGEMENT: xc: detail: Loader: 0000000000100000->00000000001bad04 xc: detail: Modules: 0000000000000000->0000000000000000 xc: detail: TOTAL: 0000000000000000->000000007f000000 xc: detail: ENTRY: 0000000000100610 xc: detail: PHYSICAL MEMORY ALLOCATION: xc: detail: 4KB PAGES: 0x0000000000000200 xc: detail: 2MB PAGES: 0x00000000000003f7 xc: detail: 1GB PAGES: 0x0000000000000000 xc: detail: elf_load_binary: phdr 0 at 0x7fab7190a000 -> 0x7fab719bb151 domainbuilder: detail: xc_dom_gnttab_hvm_seed: called, pfn=0xff000 libxl: error: libxl_dm.c:1849:device_model_spawn_outcome: domain 29 device model: spawn failed (rc=-3) libxl: error: libxl_create.c:1340:domcreate_devmodel_started: device model did not start: -3 libxl: error: libxl_dm.c:1959:kill_device_model: Device Model already exited libxl: error: libxl.c:1580:libxl__destroy_domid: non-existant domain 29 libxl: error: libxl.c:1538:domain_destroy_callback: unable to destroy guest with domid 29 libxl: error: libxl.c:1465:domain_destroy_cb: destruction of domain 29 failed (xen-4.6rc3-4.el7.x86_64) -- --------- Greetz

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virt October 2015