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

[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

On 13.11.2014 11:57, Roger Pau Monné wrote:
> El 12/11/14 a les 19.41, Xing Lin ha escrit:
>> Hi,
>>
>> 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. I could not find
>> /etc/init.d/xencommons either. Then, 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.
>>
>> "$ virt-install --connect=xen:/// --name u14.04.3 --ram 1024 --disk
>> u14.04.3.img,size=4,driver_name=qemu --location
>> http://ftp.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/ --network
>> bridge=virbr0"
>>
>>
>> dmesg:
>>
>> [ 9443.130600] blkfront: xvda: flush diskcache: enabled; persistent grants:
>> enabled; indirect descriptors: disabled;
>> [ 9443.132818]  xvda: 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          O
>> 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]  0000000000000009 ffff8802d13d9aa8 ffffffff8171bd04
>> 0000000000000000
>> [ 9448.325501]  ffff8802d13d9ae0 ffffffff810676cd 0000000000000000
>> 0000000000000001
>> [ 9448.325505]  ffff88030418ffe0 ffff88031d6ab180 0000000000000010
>> ffff8802d13d9af0
>> [ 9448.325509] Call Trace:
>> [ 9448.325518]  [<ffffffff8171bd04>] dump_stack+0x45/0x56
>> [ 9448.325523]  [<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0
>> [ 9448.325526]  [<ffffffff810677aa>] warn_slowpath_null+0x1a/0x20
>> [ 9448.325530]  [<ffffffff81004e99>] xen_mc_flush+0x1a9/0x1b0
>> [ 9448.325534]  [<ffffffff81006b99>] xen_set_pud_hyper+0x109/0x110
>> [ 9448.325538]  [<ffffffff81006c3b>] xen_set_pud+0x9b/0xb0
>> [ 9448.325543]  [<ffffffff81177f06>] __pmd_alloc+0xd6/0x110
>> [ 9448.325548]  [<ffffffff81182218>] move_page_tables+0x678/0x720
>> [ 9448.325552]  [<ffffffff8117ddb7>] ? vma_adjust+0x337/0x7d0
>> [ 9448.325557]  [<ffffffff811c23fd>] shift_arg_pages+0xbd/0x1b0
>> [ 9448.325560]  [<ffffffff81181671>] ? mprotect_fixup+0x151/0x290
>> [ 9448.325564]  [<ffffffff811c26cb>] setup_arg_pages+0x1db/0x200
>> [ 9448.325570]  [<ffffffff81213edc>] load_elf_binary+0x41c/0xd80
>> [ 9448.325576]  [<ffffffff8131d503>] ? ima_get_action+0x23/0x30
>> [ 9448.325579]  [<ffffffff8131c7e2>] ? process_measurement+0x82/0x2c0
>> [ 9448.325584]  [<ffffffff811c2f7f>] search_binary_handler+0x8f/0x1b0
>> [ 9448.325587]  [<ffffffff811c44f7>] do_execve_common.isra.22+0x5a7/0x7e0
>> [ 9448.325591]  [<ffffffff811c49c6>] SyS_execve+0x36/0x50
>> [ 9448.325596]  [<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. Any help will be highly appreciated!
> 
> This looks like the bug already reported by George Dunlap, could you try
> to apply the following patch to qemu-xen and recompile?
> 
> http://lists.xenproject.org/archives/html/xen-devel/2014-11/msg01112.html

If that turns out to be the problem we need to get a bug reported against the
qemu package as the distro packaged Xen uses stock qemu with xl.

-Stefan

> 
> Roger.
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel
>

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