Public bug reported:
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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: xenial
** Summary changed:
- Xubuntu 16.04 L0 hypervisor kernel panics L1 CentOS 7.5..1804 guest
+ Xubuntu 16.04 L0 hypervisor kernel panics L1 CentOS 7.5.1804 guest
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https://bugs.launchpad.net/bugs/1783952
Title:
Xubuntu 16.04 L0 hypervisor kernel panics L1 CentOS 7.5.1804 guest
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