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Description of problem: dmidecode module fails to decode DMI data How reproducible: >>> import dmidecode >>> dmidecode.system() Traceback (most recent call last): File "<stdin>", line 1, in <module> RuntimeError: [src/dmidecodemodule.c:331] Error decoding DMI data Journal shows: kernel: Lockdown: python: /dev/mem,kmem,port is restricted; see man kernel_lockdown.7 If it helps, dmidecode command works fine. This issue causes error in oVirt project VDSM daemon which relies on dmidecode python module: Traceback (most recent call last): File "/usr/lib/python3.9/site-packages/vdsm/API.py", line 1418, in getHardwareInfo hw = supervdsm.getProxy().getHardwareInfo() File "/usr/lib/python3.9/site-packages/vdsm/common/supervdsm.py", line 56, in __call__ return callMethod() File "/usr/lib/python3.9/site-packages/vdsm/common/supervdsm.py", line 53, in <lambda> getattr(self._supervdsmProxy._svdsm, self._funcName)(*args, File "<string>", line 2, in getHardwareInfo File "/usr/lib64/python3.9/multiprocessing/managers.py", line 825, in _callmethod raise convert_to_error(kind, result) RuntimeError: [src/dmidecodemodule.c:331] Error decoding DMI data The system is a VM with UEFI Bios. # rpm -qa |grep dmi dmidecode-3.3-7.el9.x86_64 python3-dmidecode-3.12.2-27.el9.x86_64
According to man page SysRq+x should disable the kernel lockdown but running: echo 1 > /proc/sys/kernel/sysrq echo x > /proc/sysrq-trigger shows in dmesg: sysrq: HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p) show-all-timers(q) unraw(r) sync(s) show-task-states(t) unmount(u) force-fb(v) show-blocked-tasks(w) dump-ftrace-buffer(z) so looks like the x option is not there.
(In reply to Sandro Bonazzola from comment #1) > According to man page SysRq+x should disable the kernel lockdown but running: > > echo 1 > /proc/sys/kernel/sysrq > echo x > /proc/sysrq-trigger > > shows in dmesg: > sysrq: HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tasks(e) > memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) sak(k) > show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) > poweroff(o) show-registers(p) show-all-timers(q) unraw(r) sync(s) > show-task-states(t) unmount(u) force-fb(v) show-blocked-tasks(w) > dump-ftrace-buffer(z) > > so looks like the x option is not there. "x" does not mean "x" here, it is just refer to any usable options in the kernel sysrq table above. For lockdown, it is not possible to disable it on runtime unless you disable it in grub kernel cmdline (it may not work for Secure Boot case because kernel will lockdown automatically).
looks like the issue was known since 2019: https://github.com/nima/python-dmidecode/issues/15 project looks abandoned since a year ago, last merged commit being f0a089a on 30 Jun 2021 Project owner seems to be https://www.linkedin.com/in/nimatalebi/ did you try contacting him?
(In reply to Sandro Bonazzola from comment #7) > looks like the issue was known since 2019: > https://github.com/nima/python-dmidecode/issues/15 > > project looks abandoned since a year ago, last merged commit being f0a089a > on 30 Jun 2021 > > Project owner seems to be https://www.linkedin.com/in/nimatalebi/ did you > try contacting him? The Github issue was recently updated (Sept 5 2022) with a comment from the developer : https://github.com/nima/python-dmidecode/issues/15#issuecomment-1236772035 "This issue has been fixed in the smbios-3.3.0 branch. Could you please have a try? If there are any issues, welcome to report it. Thanks." The issue has since been closed as "completed" today, pointing to commit https://github.com/nima/python-dmidecode/commit/c97d1ca021ddc160d70525d0840b1731f50ac4ca I hope this can make it soon to Centos/oVirt as I am stuck trying to deploy hosted-engine on a Centos 9 with secure boot ?
Lichen Liu, any update?
(In reply to Sandro Bonazzola from comment #20) > Lichen Liu, any update? Hello, We did a scratch build a few days ago, but there are some bugs. The developer pushed some new commits to the GitHub today, we are still working on the testing work. Thanks, Lichen
Just to note that I have manually installed the new version v3.12.3 from the python-dmidecode github repo and that resolved my ovirt deployment problem. Please consider releasing the fixed packages to rhel/centos