It's been almost a week, so in the meanwhile I found a workaround. I
just downgraded the kernel to 4.18.x to match RHEL8's maintained version.
I did not even have to apply all the RHEL/CentOS patches I found. Just
building the latest 4.18 vanilla kernel (4.18.20) did the job. I
suppose it could possibly work with a few more recent versions. But for
that, some insights would be needed from you guys, to figure out what
parts of the DLM kernel implementation is making the user-land DLM obsolete.
Anyhow I am now using GFS2 and DLM on Slackware Linux current (with a
downgraded kernel version) and it works pretty well so far.
GFS2 FROM SCRATCH
https://pub.nethence.com/storage/gfs2
Thanks
Pierre-Philipp
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