OK, so the title needs a little explanation:)
I have Xubuntu 16.04.5 LTS installed in my workstation. In there I have installed virt-manager, libvirt, qemu etc. to run a CentOS 7.5 VM as another hypervisor using nested virtualization; this VM works.
What does not work however is inside of the CentOS VM installing virt-manager, libvirt, qemu, etc. and run another VM inside of that. Trying to start a CentOS VM inside my L1 CentOS hypervisor kernel panics very soon after grub with a backtrace like this:
[ 1.441389] general protection fault: 0000 [#1] SMP
[ 1.442030] Modules linked in:
[ 1.442030] CPU: 0 PID: 47 Comm: kworker/u2:1 Not tainted 3.10.0-862.el7.x86_64 #1
[ 1.442030] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[ 1.442030] task: ffff8b1d3868dee0 ti: ffff8b1d3f8fc000 task.ti: ffff8b1d3f8fc000
[ 1.442030] RIP: 0010:[<ffffffffa6a22ce5>] [<ffffffffa6a22ce5>] flush_old_exec+0x725/0x980
[ 1.442030] RSP: 0018:ffff8b1d3f8ffd00 EFLAGS: 00010246
[ 1.442030] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000049
[ 1.442030] RDX: 0000000000000000 RSI: ffff8b1d3f8dc640 RDI: ffff8b1d3f8dc000
[ 1.442030] RBP: ffff8b1d3f8ffd60 R08: 0000000000000046 R09: 0000000000000000
[ 1.442030] R10: 000000002b764c0c R11: ffffbfc001fe3000 R12: ffff8b1d3f8dc640
[ 1.442030] R13: ffff8b1d3f8dc000 R14: ffff8b1d3868dee0 R15: ffff8b1d37e4c100
[ 1.442030] FS: 0000000000000000(0000) GS:ffff8b1d3bc00000(0000) knlGS:0000000000000000
[ 1.442030] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1.442030] CR2: 00007fc3814202a8 CR3: 0000000061c0e000 CR4: 00000000003606f0
[ 1.442030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1.442030] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1.442030] Call Trace:
[ 1.442030] [<ffffffffa6a7e44c>] load_elf_binary+0x33c/0xe50
[ 1.442030] [<ffffffffa6af34d9>] ? ima_bprm_check+0x49/0x50
[ 1.442030] [<ffffffffa6a7e110>] ? load_elf_library+0x220/0x220
[ 1.442030] [<ffffffffa6a2202f>] search_binary_handler+0xef/0x310
[ 1.442030] [<ffffffffa6a2380b>] do_execve_common.isra.24+0x5db/0x6e0
[ 1.442030] [<ffffffffa6a23928>] do_execve+0x18/0x20
[ 1.442030] [<ffffffffa68af8ef>] ____call_usermodehelper+0xff/0x140
[ 1.442030] [<ffffffffa68af7f0>] ? call_usermodehelper+0x60/0x60
[ 1.442030] [<ffffffffa6f1f637>] ret_from_fork_nospec_begin+0x21/0x21
[ 1.442030] [<ffffffffa68af7f0>] ? call_usermodehelper+0x60/0x60
[ 1.442030] Code: cf e9 ff 4c 89 f7 e8 fb 32 e7 ff e9 4d fa ff ff 65 8b 05 37 a3 5e 59 a8 01 0f 84 85 fc ff ff 31 d2 b8 01 00 00 00 b9 49 00 00 00 <0f> 30 0f 1f 44 00 00 48 c7 c0 10 00 00 00 e8 07 00 00 00 f3 90
[ 1.442030] RIP [<ffffffffa6a22ce5>] flush_old_exec+0x725/0x980
[ 1.442030] RSP <ffff8b1d3f8ffd00>
[ 1.669827] ---[ end trace acc22b186f1c20ae ]---
[ 1.674444] Kernel panic - not syncing: Fatal exception
[ 1.675410] Kernel Offset: 0x25800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
However, using the exact same procedure is successfull using an Xubuntu 18.04 as L0 instead!
So, to simplify:
Xubuntu 16.04 -> CentOS 7.5.1804 -> CentOS 7.5.1804 = Kernel panic
Xubuntu 18.04 -> CentOS 7.5.1804 -> CentOS 7.5.1804 = Success!
Please know if there´s any more information you need!
Thanks in advance!
/K
---
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: karli 2591 F.... pulseaudio
/dev/snd/controlC0: karli 2591 F.... pulseaudio
CurrentDesktop: XFCE
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=/dev/mapper/vg00-swap_1
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 138a:0090 Validity Sensors, Inc.
Bus 001 Device 002: ID 04f2:b52c Chicony Electronics Co., Ltd
Bus 001 Device 004: ID 8087:0a2b Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 20EN0013US
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-131-generic root=/dev/mapper/vg00-root ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.4.0-131.157-generic 4.4.134
RelatedPackageVersions:
linux-restricted-modules-4.4.0-131-generic N/A
linux-backports-modules-4.4.0-131-generic N/A
linux-firmware 1.157.20
Tags: xenial
Uname: Linux 4.4.0-131-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dialout dip fax floppy games libvirtd lpadmin plugdev sambashare sudo tape video
_MarkForUpload: True
dmi.bios.date: 09/28/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: N1EET73W (1.46 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20EN0013US
dmi.board.vendor: LENOVO
dmi.board.version: 0B98417 PRO
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1EET73W(1.46):bd09/28/2017:svnLENOVO:pn20EN0013US:pvrThinkpadP50:rvnLENOVO:rn20EN0013US:rvr0B98417PRO:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20EN0013US
dmi.product.version: Thinkpad P50
dmi.sys.vendor: LENOVO
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1783952
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.