[CentOS-virt] Centos 7 Kernel 3.10.0-693.11.6.el7.x86_64 does not boot PV

Mon Jan 8 20:10:28 UTC 2018
Shaun Reitan <shaun.reitan at ndchost.com>

While installing the experemental kernel on a CentOS 7 PV the following 
happened. After a reboot of the PV the kernel looks to be installed but 
there is no option for booting it in grub.  I attempted to run yum 
reinstall kernel-4.9.75-204.el7.centos.x86_64 and it installed fine but 
still no entry in grub. No initramfs existed and I found kernel-modules 
did not install properly so I then ran yum reinstall kernel-modules and 
received a ton of errors that looked like the following..

depmod: ERROR: failed to load symbols from 
/lib/modules/4.9.75-204.el7.centos.x86_64/kernel/drivers/misc/sgi-xp/xpc.ko.xz: 
Exec format error

after which a initramfs does exist however on reboot still no option for 
the new kernel.


[root at CC0A2543 ~]# [  587.145018] ------------[ cut here ]------------
[  587.145018] kernel BUG at arch/x86/kernel/paravirt.c:244!
[  587.145018] invalid opcode: 0000 [#1] SMP
[  587.145018] Modules linked in: xen_netfront coretemp pcspkr ip_tables 
ext4 mbcache jbd2 xen_blkfront
[  587.145018] CPU: 0 PID: 2126 Comm: dracut Not tainted 
3.10.0-123.4.4.el7.x86_64 #1
[  587.145018] task: ffff880002da5b00 ti: ffff8800f6088000 task.ti: 
ffff8800f6088000
[  587.145018] RIP: e030:[<ffffffff815da23b>]  [<ffffffff815da23b>] 
enter_lazy.part.0+0x4/0x6
[  587.145018] RSP: e02b:ffff8800ff403ab0  EFLAGS: 00010002
[  587.145018] RAX: 0000000000000001 RBX: ffff8800f8ad4040 RCX: 
00003ffffffff000
[  587.145018] RDX: ffff880000000040 RSI: ffff880000000000 RDI: 
00000005a52cc067
[  587.145018] RBP: ffff8800ff403ab0 R08: ffff8800ff403b78 R09: 
ffffffff81362409
[  587.145018] R10: ffff8800fa001e00 R11: ffff880000000000 R12: 
ffffc90000609000
[  587.145018] R13: ffffc90000608000 R14: 0000000000000000 R15: 
ffffffff8100a6b0
[  587.145018] FS:  00007f14b0680740(0000) GS:ffff8800ff400000(0000) 
knlGS:0000000000000000
[  587.145018] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  587.145018] CR2: 00007f14b0473000 CR3: 00000000f6099000 CR4: 
0000000000002660
[  587.145018] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[  587.145018] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
0000000000000400
[  587.145018] Stack:
[  587.145018]  ffff8800ff403ac0 ffffffff81046bc7 ffff8800ff403b60 
ffffffff8116d8d6
[  587.145018]  ffffc90000608fff ffffc90000609000 ffffffff818cec90 
ffffc90000608fff
[  587.145018]  ffffc90000609000 ffff8800fa04d000 0000000000000004 
ffffc90000608fff
[  587.145018] Call Trace:
[  587.145018]  <IRQ>
[  587.145018]  [<ffffffff81046bc7>] paravirt_enter_lazy_mmu+0x27/0x30
[  587.145018]  [<ffffffff8116d8d6>] apply_to_page_range+0x266/0x440
[  587.145018]  [<ffffffff8100a7fb>] arch_gnttab_map_status+0x3b/0x70
[  587.145018]  [<ffffffff81362486>] gnttab_map_frames_v2+0xd6/0x150
[  587.145018]  [<ffffffff813625a1>] gnttab_map+0xa1/0x140
[  587.145018]  [<ffffffff81362740>] get_free_entries+0x100/0x2e0
[  587.145018]  [<ffffffff813629e5>] 
gnttab_alloc_grant_references+0x15/0x30
[  587.145018]  [<ffffffffa0000cc3>] do_blkif_request+0x683/0x850 
[xen_blkfront]
[  587.145018]  [<ffffffff812906c3>] __blk_run_queue+0x33/0x40
[  587.145018]  [<ffffffff812906f9>] blk_start_queue+0x29/0x40
[  587.145018]  [<ffffffffa0000eb1>] 
kick_pending_request_queues+0x21/0x30 [xen_blkfront]
[  587.145018]  [<ffffffffa0001487>] blkif_interrupt+0x5c7/0x670 
[xen_blkfront]
[  587.145018]  [<ffffffff810f735e>] handle_irq_event_percpu+0x3e/0x1e0
[  587.145018]  [<ffffffff810f753d>] handle_irq_event+0x3d/0x60
[  587.145018]  [<ffffffff810fa1c7>] handle_edge_irq+0x77/0x130
[  587.145018]  [<ffffffff81363527>] __xen_evtchn_do_upcall+0x227/0x350
[  587.145018]  [<ffffffff813656db>] xen_evtchn_do_upcall+0x2b/0x50
[  587.145018]  [<ffffffff815f3f7e>] 
xen_do_hypervisor_callback+0x1e/0x30
[  587.145018]  <EOI>
[  587.145018]  [<ffffffff812b8419>] ? free_cpumask_var+0x9/0x10
[  587.145018]  [<ffffffff81169618>] ? unmap_page_range+0x5f8/0x860
[  587.145018]  [<ffffffff81169901>] ? unmap_single_vma+0x81/0xf0
[  587.145018]  [<ffffffff8116a9c9>] ? unmap_vmas+0x49/0x90
[  587.145018]  [<ffffffff8117367c>] ? exit_mmap+0xac/0x1a0
[  587.145018]  [<ffffffff8105b187>] ? mmput+0x67/0xf0
[  587.145018]  [<ffffffff811b6c32>] ? flush_old_exec+0x422/0x880
[  587.145018]  [<ffffffff812069cc>] ? load_elf_binary+0x33c/0xde0
[  587.145018]  [<ffffffff81272b13>] ? ima_get_action+0x23/0x30
[  587.145018]  [<ffffffff8127217e>] ? process_measurement+0x8e/0x250
[  587.145018]  [<ffffffff81272639>] ? ima_bprm_check+0x49/0x50
[  587.145018]  [<ffffffff81206690>] ? load_elf_library+0x230/0x230
[  587.145018]  [<ffffffff811b6355>] ? search_binary_handler+0xf5/0x310
[  587.145018]  [<ffffffff811b78e9>] ? 
do_execve_common.isra.22+0x559/0x650
[  587.145018]  [<ffffffff811b7c76>] ? SyS_execve+0x36/0x50
[  587.145018]  [<ffffffff815f2b89>] ? stub_execve+0x69/0xa0
[  587.145018] Code: 8d 55 f0 48 8d 4d f4 e8 b4 8e a2 ff 66 90 48 8b 55 
f8 65 48 33 14 25 28 00 00 00 8b 45 e8 74 05 e8 ab 3a a8 ff c9 c3 55 48 
89 e5 <0f> 0b 66 66 66 66 90 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 66 66
[  587.145018] RIP  [<ffffffff815da23b>] enter_lazy.part.0+0x4/0x6
[  587.145018]  RSP <ffff8800ff403ab0>
[  587.145018] ---[ end trace 8566ed161f106c20 ]---
[  587.145018] Kernel panic - not syncing: Fatal exception in interrupt




--
Shaun Reitan
NDCHost.com

------ Original Message ------
From: "Johnny Hughes" <johnny at centos.org>
To: centos-virt at centos.org
Sent: 2018-01-06 05:34:22 AM
Subject: Re: [CentOS-virt] Centos 7 Kernel 3.10.0-693.11.6.el7.x86_64 
does not boot PV

>On 01/06/2018 03:16 AM, Dmitry Melekhov wrote:
>>The same problem with latest centos 6 kernel,i.e. with meltdown fix.
>>
>>I can't see console output, because I have it on "cloud" provider
>>hosting :-)
>>
>>
>>
>>06.01.2018 05:13, Shaun Reitan пишет:
>>>Broken!
>>>
>>>
>
>
>For those of you looking for a PV enabled client Kernel for CentOS 
>Linux
>7 DomU VMs, you can use our Experimental kernel from here:
>
>http://mirror.centos.org/altarch/7/experimental/x86_64/
>
>There is a repo file at the BOTTOM of this wiki page that you can use 
>to
>enable the experimental repo:
>
>https://wiki.centos.org/SpecialInterestGroup/AltArch/i386
>
>That experimental repo file will work for x86_64 or i386 installs and
>the latest released kernel (kernel-4.9.75-204.el7.centos). This kernel
>has the CONFIG_PAGE_TABLE_ISOLATION=y security fixes (used to be
>CONFIG_KAISER .. and still is in the Red Hat released kernels).
>
>You could also use the Dom0 kernels from the Xen repo as DomU kernels
>for your PV VMs if you want. Currently the 4.9.75 Xen kernels are in
>the testing repo and waiting for tests to release.
>
>Thanks,
>Johnny Hughes
>
>
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