Bug 2457277
| Summary: | SMC (shared memory communication) kernel module is not present in Fedora44 which has 6.19.8-300.fc44.s390x kernel | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | IBM Bug Proxy <bugproxy> |
| Component: | kernel | Assignee: | Justin M. Forbes <jforbes> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | high | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 44 | CC: | acaringi, adscvr, airlied, bugproxy, dan, hans, hpa, jforbes, kernel-maint, linville, masami256, mchehab, nickolasjcarr, ptalbert, steved, suraj.ghimire7, tstaudt |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | s390x | ||
| OS: | All | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-7.0.0-62.fc45 kernel-7.0.1-200.fc44 | Doc Type: | --- |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2026-05-14 07:45:03 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 467765 | ||
|
Description
IBM Bug Proxy
2026-04-10 11:10:33 UTC
== Comment: #0 - Mahanta Jambigi <Mahanta.Jambigi> - 2026-04-10 05:51:53 == ---Problem Description--- DIBS & SMC module are not part of default kernel config in Fedora44 ---Debugger--- A debugger is not configured ---uname output--- Linux t83lp72.lnxne.boe 6.19.8-300.fc44.s390x #1 SMP Fri Mar 13 21:00:49 UTC 2026 s390x GNU/Linux Contact Information = Mahanta.Jambigi Machine Type = LPAR ---Steps to Reproduce--- Install Fedora44 & run smc_pnet command. We will get below error. However the same command works fine on Fedora43 & internally this command load smc.ko. [root@server ~]$ smc_pnet smc_pnet: SMC module not loaded [root@server ~]$ The reason for this is that CONFIG_DIBS is not set in default config. This has to be set which in-turn will set CONFIG_SMC & CONFIG_SMC_DIAG modules. This way smc.ko gets loaded when we run 'smc_pnet' command or we can load it manually using 'modprobe smc' also. Check below output from Fedora43. [root@server ~]$ cat /boot/config-6.17.1-300.fc43.s390x | grep -i smc CONFIG_SMC=m CONFIG_SMC_DIAG=m # CONFIG_SMC_LO is not set [root@server ~]$ *Additional Instructions for Mahanta.Jambigi: -Post a private note with access information to the machine that the bug is occuring on. == Comment: #1 - Thomas Staudt <tstaudt.com> - 2026-04-10 05:58:10 == This worked with Fedora 43. If I see right, then https://gitlab.com/cki-project/kernel-ark/-/blob/os-build/redhat/configs/common/generic/CONFIG_DIBS being "# CONFIG_DIBS is not set" is the culprit, the SMC configs are set correctly will be fixed with https://gitlab.com/cki-project/kernel-ark/-/commit/75b73b21389cbdc98fdf6a219b42795d727c7a19 in a next kernel build ------- Comment From Mahanta.Jambigi 2026-05-14 03:22 EDT------- What is the latest update on this, do you have the next kernel build where SMC module is enabled? The SMC module was re-enabled in kernel-7.0.0-62.fc45 and backported to F-44 as well (since kernel-7.0.1-200.fc44). |