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[Xen-devel] dom0 kenrel crashes for openstack + libvirt + libxl



Hi,Â

I am aware that Xen via libvirt is in the group C support for openstack but since I am not able to install xenserver iso at compute machines I have, I have to consider to use xen with libvirt (xcp-xapi is not available for ubuntu14.04). I have three nodes, each one running ubuntu 14.04. I follow the instruction to install juno in ubuntu 14.04 and it works (I can create instances from openstack GUI - horizon) when I use kvm as the hypervisor at the compute node . However, if I switch to use xen as the hypervisor by installing xen-hypervisor-amd64 or nova-compute-xen, it will fail to create instances. It complained "backend for qemu disk is not ready". I checked and did not find qemu process running in dom0.ÂI could not find /etc/init.d/xencommons either.ÂThen, I compiled and installed xen-4.4 from source code and I got xencommons in /etc/init.d. qemu process is running in dom0. However, the dom0 kernel crashes this time when I try to launch an instance from openstack GUI. I am able to create a xen guest with virt-install from command line, with the following command.Â

"$ virt-install --connect=xen:/// --name u14.04.3 --ram 1024 --disk u14.04.3.img,size=4,driver_name=qemu --locationÂhttp://ftp.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/Â--network bridge=virbr0"


dmesg:Â

[ 9443.130600] blkfront: xvda: flush diskcache: enabled; persistent grants: enabled; indirect descriptors: disabled;
[ 9443.132818] Âxvda: xvda1
[ 9444.604489] xen:grant_table: WARNING: g.e. 0x30 still in use!
[ 9444.604496] deferring g.e. 0x30 (pfn 0xffffffffffffffff)
[ 9444.604499] xen:grant_table: WARNING: g.e. 0x31 still in use!
[ 9444.604502] deferring g.e. 0x31 (pfn 0xffffffffffffffff)
[ 9444.604505] xen:grant_table: WARNING: g.e. 0x32 still in use!
[ 9444.604508] deferring g.e. 0x32 (pfn 0xffffffffffffffff)
 ==== lots of them====
[ 9444.604719] xen:grant_table: WARNING: g.e. 0xe still in use!
[ 9444.604721] deferring g.e. 0xe (pfn 0xffffffffffffffff)
[ 9444.604723] xen:grant_table: WARNING: g.e. 0xd still in use!
[ 9444.604725] deferring g.e. 0xd (pfn 0xffffffffffffffff)
[ 9448.325408] ------------[ cut here ]------------
[ 9448.325421] WARNING: CPU: 5 PID: 19902 at /build/buildd/linux-3.13.0/arch/x86/xen/multicalls.c:129 xen_mc_flush+0x
1a9/0x1b0()
[ 9448.325492] CPU: 5 PID: 19902 Comm: sudo Tainted: GF Â Â Â Â ÂO 3.13.0-33-generic #58-Ubuntu
[ 9448.325494] Hardware name: Dell Inc. PowerEdge R710/00W9X3, BIOS 2.1.15 09/02/2010
[ 9448.325497] Â0000000000000009 ffff8802d13d9aa8 ffffffff8171bd04 0000000000000000
[ 9448.325501] Âffff8802d13d9ae0 ffffffff810676cd 0000000000000000 0000000000000001
[ 9448.325505] Âffff88030418ffe0 ffff88031d6ab180 0000000000000010 ffff8802d13d9af0
[ 9448.325509] Call Trace:
[ 9448.325518] Â[<ffffffff8171bd04>] dump_stack+0x45/0x56
[ 9448.325523] Â[<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0
[ 9448.325526] Â[<ffffffff810677aa>] warn_slowpath_null+0x1a/0x20
[ 9448.325530] Â[<ffffffff81004e99>] xen_mc_flush+0x1a9/0x1b0
[ 9448.325534] Â[<ffffffff81006b99>] xen_set_pud_hyper+0x109/0x110
[ 9448.325538] Â[<ffffffff81006c3b>] xen_set_pud+0x9b/0xb0
[ 9448.325543] Â[<ffffffff81177f06>] __pmd_alloc+0xd6/0x110
[ 9448.325548] Â[<ffffffff81182218>] move_page_tables+0x678/0x720
[ 9448.325552] Â[<ffffffff8117ddb7>] ? vma_adjust+0x337/0x7d0
[ 9448.325557] Â[<ffffffff811c23fd>] shift_arg_pages+0xbd/0x1b0
[ 9448.325560] Â[<ffffffff81181671>] ? mprotect_fixup+0x151/0x290
[ 9448.325564] Â[<ffffffff811c26cb>] setup_arg_pages+0x1db/0x200
[ 9448.325570] Â[<ffffffff81213edc>] load_elf_binary+0x41c/0xd80
[ 9448.325576] Â[<ffffffff8131d503>] ? ima_get_action+0x23/0x30
[ 9448.325579] Â[<ffffffff8131c7e2>] ? process_measurement+0x82/0x2c0
[ 9448.325584] Â[<ffffffff811c2f7f>] search_binary_handler+0x8f/0x1b0
[ 9448.325587] Â[<ffffffff811c44f7>] do_execve_common.isra.22+0x5a7/0x7e0
[ 9448.325591] Â[<ffffffff811c49c6>] SyS_execve+0x36/0x50
[ 9448.325596] Â[<ffffffff8172cc99>] stub_execve+0x69/0xa0
[ 9448.325599] ---[ end trace 53ac16782e751c0a ]---
[ 9448.347994] ------------[ cut here ]------------
[ 9448.348004] WARNING: CPU: 1 PID: 19902 at /build/buildd/linux-3.13.0/mm/mmap.c:2736 exit_mmap+0x16b/0x170()
==== more message ignored ====


I sent emails to the openstack mailing list and they gave me a few suggestions. At last, Bob Ball suggested I should probably ask this question on xen-devel mailing list.ÂAny help will be highly appreciated! Thanks,

Original discussion on openstack mailing list:Â


-XingÂ


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