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

Johnny Hughes johnny at centos.org
Tue Jan 9 15:33:26 UTC 2018


On 01/08/2018 02:10 PM, Shaun Reitan wrote:
> 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.

Installed and works fine for me.

Very odd.

from my Dom0 machine:
[root at xendom0 ~]# uname -a
Linux xendom0 4.9.75-29.el7.x86_64 #1 SMP Fri Jan 5 19:42:28 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux

From my DomU CentOS-7 PV VM:
Linux x7-x8664-pv 4.9.75-204.el7.centos.x86_64 #1 SMP Fri Jan 5 17:51:39
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

My CentOS-7 PV config:
[root at xendom0 ~]# cat /etc/xen/config.d/c7-x8664.pv.cfg
bootloader= "/usr/lib/xen/bin/pygrub"
name = "c7-x8664.pv"
memory = 4096
vcpus = 2
vif = [ 'mac=00:16:3E:29:00:02,bridge=xenbr0' ]
disk = [ 'phy:/dev/cl/c7-x8664-pv,xvda,rw' ]
vfb = [ 'type=vnc,vncdisplay=1,vncpasswd=supersecret' ]



> 
> 
> [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 <mailto:johnny at centos.org>>
> To: centos-virt at centos.org <mailto: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
>>  
>>  
> 
> 
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt
> 


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