View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000422 | AlmaLinux-8 | kernel | public | 2023-08-27 09:38 | 2023-10-17 00:42 |
| Reporter | gvde2 | Assigned To | alukoshko | ||
| Priority | normal | Severity | crash | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Summary | 0000422: AlmaLinux 8.8. kernel issue - missing patch | ||||
| Description | The kernel for 8.8 introduced an issue for VMs running on Xen that makes it impossible to pause or migrate VMs in the xen pool. It’s explained here: https://xcp-ng.org/blog/2023/06/09/troubleshooting-live-migration-crashes-in-rhel-8-8-and-derivatives/ This patch is missing: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/xen/events/events_base.c?id=a0bb51f2638e0810c347024679239fd10a8f7990&ref=xcp-ng.org I have noticed that for rhel8.8 the latest kernel 4.18.0-477.21.1.el8_8.x86_64 does include the patch, while it is still missing in the same version on almalinux 8.8. On almalinux: [root@alma8 ~]# uname -a Linux alma8.dkrz.de 4.18.0-477.21.1.el8_8.x86_64 #1 SMP Thu Aug 10 13:51:50 EDT 2023 x86_64 x86_64 x86_64 GNU/Linux [root@alma8 ~]# grep xen.*vector /proc/kallsyms ffffffff8e9e34f0 T xen_callback_vector ffffffff8e9e3633 t xen_callback_vector.cold.25 ffffffff8f000fb0 T xen_hvm_callback_vector ffffffff8f7fe810 r __ksymtab_xen_have_vector_callback ffffffff8f8096af r __kstrtab_xen_have_vector_callback ffffffff903b1030 D xen_have_vector_callback on rhel8.8 [root@rhel8 ~]# uname -a Linux rhel8.dkrz.de 4.18.0-477.21.1.el8_8.x86_64 #1 SMP Thu Jul 20 08:38:27 EDT 2023 x86_64 x86_64 x86_64 GNU/Linux [root@rhel8 ~]# grep xen.*vector /proc/kallsyms ffffffff9b7e4740 T xen_setup_callback_vector ffffffff9b7e487e t xen_setup_callback_vector.cold.25 ffffffff9be00fb0 T xen_hvm_callback_vector ffffffff9c5fe840 r __ksymtab_xen_have_vector_callback ffffffff9c6096eb r __kstrtab_xen_have_vector_callback ffffffff9d1b10f0 D xen_have_vector_callback | ||||
| Steps To Reproduce | Run a AlmaLinux 8.8 VM on Xen or Citrix Hypervisor with kernel 4.18.0-477.21.1.el8_8.x86_64 installed and migrate or pause the VM. It will reset and boot. | ||||
| Tags | almalinux8 | ||||
| abrt_hash | |||||
| URL | |||||
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I can confirm this patch is not in Alma-8's kernel. |
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Unfortunately after Red Hat decision to not share sources we don't have legal way to get updated tarballs of RHEL kernels so we do Oracle Linux way now by providing only security fixes. But this patch doesn't look so complicated and I think we can release it to Testing repo pretty soon. Will you help with testing, gvde2? |
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Yes. I can test the kernel in a few of our test AL8 VMs. |
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gvde2, before I release to Testing could you please check package directly from build system? curl https://build.almalinux.org/pulp/content/builds/AlmaLinux-8-x86_64-7247-br/config.repo -o /etc/yum.repos.d/albz422.repo dnf update |
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I have created a test vm, installed the 21.2 kernel, rebooted and was able to migrate the VMs between hosts in the xen pool. So it seems to fix this issue. |
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Thanks for update. Releasing to Testing repo. |
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@alukoshko Is it going to stay in the testing repo or get moved to the main repo eventually? Sorry I don't know how a case like this is handled. |
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@toracat This patch will be definitely included in next kernel update. For this particular build I don't know yet because new kernel version higher than RHEL's one can surprise users. |
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Fixed in latest AlmaLinux 8 kernel update |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2023-08-27 09:38 | gvde2 | New Issue | |
| 2023-08-27 09:38 | gvde2 | Tag Attached: almalinux8 | |
| 2023-08-27 16:54 | toracat | Note Added: 0000962 | |
| 2023-08-28 11:53 | alukoshko | Note Added: 0000964 | |
| 2023-08-28 14:32 | gvde2 | Note Added: 0000966 | |
| 2023-08-28 15:46 | alukoshko | Note Added: 0000967 | |
| 2023-08-28 15:46 | alukoshko | Assigned To | => alukoshko |
| 2023-08-28 15:46 | alukoshko | Status | new => feedback |
| 2023-08-28 18:42 | gvde2 | Note Added: 0000968 | |
| 2023-08-28 18:42 | gvde2 | Status | feedback => assigned |
| 2023-08-29 06:55 | alukoshko | Note Added: 0000969 | |
| 2023-08-29 13:46 | alukoshko | Status | assigned => feedback |
| 2023-08-30 18:42 | toracat | Note Added: 0000971 | |
| 2023-08-30 19:52 | alukoshko | Note Added: 0000972 | |
| 2023-09-28 12:12 | alukoshko | Note Added: 0000982 | |
| 2023-09-28 12:13 | alukoshko | Status | feedback => resolved |
| 2023-09-28 12:13 | alukoshko | Resolution | open => fixed |
