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<body><div>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..</div><div><br /></div><div>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</div><div><br /></div><div>after which a initramfs does exist however on reboot still no option for the new kernel.</div><div><br /></div><div><br /></div><div>[root@CC0A2543 ~]# [ 587.145018] ------------[ cut here ]------------<br />[ 587.145018] kernel BUG at arch/x86/kernel/paravirt.c:244!<br />[ 587.145018] invalid opcode: 0000 [#1] SMP<br />[ 587.145018] Modules linked in: xen_netfront coretemp pcspkr ip_tables ext4 mbcache jbd2 xen_blkfront<br />[ 587.145018] CPU: 0 PID: 2126 Comm: dracut Not tainted 3.10.0-123.4.4.el7.x86_64 #1<br />[ 587.145018] task: ffff880002da5b00 ti: ffff8800f6088000 task.ti: ffff8800f6088000<br />[ 587.145018] RIP: e030:[<ffffffff815da23b>] [<ffffffff815da23b>] enter_lazy.part.0+0x4/0x6<br />[ 587.145018] RSP: e02b:ffff8800ff403ab0 EFLAGS: 00010002<br />[ 587.145018] RAX: 0000000000000001 RBX: ffff8800f8ad4040 RCX: 00003ffffffff000<br />[ 587.145018] RDX: ffff880000000040 RSI: ffff880000000000 RDI: 00000005a52cc067<br />[ 587.145018] RBP: ffff8800ff403ab0 R08: ffff8800ff403b78 R09: ffffffff81362409<br />[ 587.145018] R10: ffff8800fa001e00 R11: ffff880000000000 R12: ffffc90000609000<br />[ 587.145018] R13: ffffc90000608000 R14: 0000000000000000 R15: ffffffff8100a6b0<br />[ 587.145018] FS: 00007f14b0680740(0000) GS:ffff8800ff400000(0000) knlGS:0000000000000000<br />[ 587.145018] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b<br />[ 587.145018] CR2: 00007f14b0473000 CR3: 00000000f6099000 CR4: 0000000000002660<br />[ 587.145018] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br />[ 587.145018] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400<br />[ 587.145018] Stack:<br />[ 587.145018] ffff8800ff403ac0 ffffffff81046bc7 ffff8800ff403b60 ffffffff8116d8d6<br />[ 587.145018] ffffc90000608fff ffffc90000609000 ffffffff818cec90 ffffc90000608fff<br />[ 587.145018] ffffc90000609000 ffff8800fa04d000 0000000000000004 ffffc90000608fff<br />[ 587.145018] Call Trace:<br />[ 587.145018] <IRQ><br />[ 587.145018] [<ffffffff81046bc7>] paravirt_enter_lazy_mmu+0x27/0x30<br />[ 587.145018] [<ffffffff8116d8d6>] apply_to_page_range+0x266/0x440<br />[ 587.145018] [<ffffffff8100a7fb>] arch_gnttab_map_status+0x3b/0x70<br />[ 587.145018] [<ffffffff81362486>] gnttab_map_frames_v2+0xd6/0x150<br />[ 587.145018] [<ffffffff813625a1>] gnttab_map+0xa1/0x140<br />[ 587.145018] [<ffffffff81362740>] get_free_entries+0x100/0x2e0<br />[ 587.145018] [<ffffffff813629e5>] gnttab_alloc_grant_references+0x15/0x30<br />[ 587.145018] [<ffffffffa0000cc3>] do_blkif_request+0x683/0x850 [xen_blkfront]<br />[ 587.145018] [<ffffffff812906c3>] __blk_run_queue+0x33/0x40<br />[ 587.145018] [<ffffffff812906f9>] blk_start_queue+0x29/0x40<br />[ 587.145018] [<ffffffffa0000eb1>] kick_pending_request_queues+0x21/0x30 [xen_blkfront]<br />[ 587.145018] [<ffffffffa0001487>] blkif_interrupt+0x5c7/0x670 [xen_blkfront]<br />[ 587.145018] [<ffffffff810f735e>] handle_irq_event_percpu+0x3e/0x1e0<br />[ 587.145018] [<ffffffff810f753d>] handle_irq_event+0x3d/0x60<br />[ 587.145018] [<ffffffff810fa1c7>] handle_edge_irq+0x77/0x130<br />[ 587.145018] [<ffffffff81363527>] __xen_evtchn_do_upcall+0x227/0x350<br />[ 587.145018] [<ffffffff813656db>] xen_evtchn_do_upcall+0x2b/0x50<br />[ 587.145018] [<ffffffff815f3f7e>] xen_do_hypervisor_callback+0x1e/0x30<br />[ 587.145018] <EOI><br />[ 587.145018] [<ffffffff812b8419>] ? free_cpumask_var+0x9/0x10<br />[ 587.145018] [<ffffffff81169618>] ? unmap_page_range+0x5f8/0x860<br />[ 587.145018] [<ffffffff81169901>] ? unmap_single_vma+0x81/0xf0<br />[ 587.145018] [<ffffffff8116a9c9>] ? unmap_vmas+0x49/0x90<br />[ 587.145018] [<ffffffff8117367c>] ? exit_mmap+0xac/0x1a0<br />[ 587.145018] [<ffffffff8105b187>] ? mmput+0x67/0xf0<br />[ 587.145018] [<ffffffff811b6c32>] ? flush_old_exec+0x422/0x880<br />[ 587.145018] [<ffffffff812069cc>] ? load_elf_binary+0x33c/0xde0<br />[ 587.145018] [<ffffffff81272b13>] ? ima_get_action+0x23/0x30<br />[ 587.145018] [<ffffffff8127217e>] ? process_measurement+0x8e/0x250<br />[ 587.145018] [<ffffffff81272639>] ? ima_bprm_check+0x49/0x50<br />[ 587.145018] [<ffffffff81206690>] ? load_elf_library+0x230/0x230<br />[ 587.145018] [<ffffffff811b6355>] ? search_binary_handler+0xf5/0x310<br />[ 587.145018] [<ffffffff811b78e9>] ? do_execve_common.isra.22+0x559/0x650<br />[ 587.145018] [<ffffffff811b7c76>] ? SyS_execve+0x36/0x50<br />[ 587.145018] [<ffffffff815f2b89>] ? stub_execve+0x69/0xa0<br />[ 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<br />[ 587.145018] RIP [<ffffffff815da23b>] enter_lazy.part.0+0x4/0x6<br />[ 587.145018] RSP <ffff8800ff403ab0><br />[ 587.145018] ---[ end trace 8566ed161f106c20 ]---<br />[ 587.145018] Kernel panic - not syncing: Fatal exception in interrupt<br /></div><div><br /></div><div><br /></div><div><br /></div>
<div><br /></div><div id="signature_old"><div style="FONT-SIZE: 12pt; FONT-FAMILY: Tahoma">
<div>--</div>
<div>Shaun Reitan</div>
<div>NDCHost.com</div></div></div><div><br /></div>
<div>------ Original Message ------</div>
<div>From: "Johnny Hughes" <<a href="mailto:johnny@centos.org">johnny@centos.org</a>></div>
<div>To: <a href="mailto:centos-virt@centos.org">centos-virt@centos.org</a></div>
<div>Sent: 2018-01-06 05:34:22 AM</div>
<div>Subject: Re: [CentOS-virt] Centos 7 Kernel 3.10.0-693.11.6.el7.x86_64 does not boot PV</div><div><br /></div>
<div id="x544f105beac44f6" class="plain"><blockquote cite="07098c4a-5bd6-a95c-bd14-2c83df896e00@centos.org" type="cite" class="cite2">
<tt style="word-wrap:break-word"><div>On 01/06/2018 03:16 AM, Dmitry Melekhov wrote:</div>
<blockquote type="cite" class="cite">
<div> The same problem with latest centos 6 kernel,i.e. with meltdown fix.</div>
<div> </div>
<div> I can't see console output, because I have it on "cloud" provider</div>
<div> hosting :-)</div>
<div> </div>
<div> </div>
<div> </div>
<div> 06.01.2018 05:13, Shaun Reitan пишет:</div>
<blockquote type="cite" class="cite">
<div> Broken!</div>
<div> </div>
<div> </div>
</blockquote>
</blockquote>
<div> </div>
<div> </div>
<div>For those of you looking for a PV enabled client Kernel for CentOS Linux</div>
<div>7 DomU VMs, you can use our Experimental kernel from here:</div>
<div> </div>
<div><a href="http://mirror.centos.org/altarch/7/experimental/x86_64/">http://mirror.centos.org/altarch/7/experimental/x86_64/</a></div>
<div> </div>
<div>There is a repo file at the BOTTOM of this wiki page that you can use to</div>
<div>enable the experimental repo:</div>
<div> </div>
<div><a href="https://wiki.centos.org/SpecialInterestGroup/AltArch/i386">https://wiki.centos.org/SpecialInterestGroup/AltArch/i386</a></div>
<div> </div>
<div>That experimental repo file will work for x86_64 or i386 installs and</div>
<div>the latest released kernel (kernel-4.9.75-204.el7.centos). This kernel</div>
<div>has the CONFIG_PAGE_TABLE_ISOLATION=y security fixes (used to be</div>
<div>CONFIG_KAISER .. and still is in the Red Hat released kernels).</div>
<div> </div>
<div>You could also use the Dom0 kernels from the Xen repo as DomU kernels</div>
<div>for your PV VMs if you want. Currently the 4.9.75 Xen kernels are in</div>
<div>the testing repo and waiting for tests to release.</div>
<div> </div>
<div>Thanks,</div>
<div>Johnny Hughes</div>
<div> </div>
<div> </div>
</tt></blockquote></div>
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