Hi,
just for the records: My problem is now resolved.
As expected, my problem was caused by a bug in kernel. A patch was
already merged into mainline:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e053aaf4da56cbf0afb33a0fda4a62188e2c0637
Backport for 5.15 and 5.19 is available but pending,
https://www.spinics.net/lists/stable/msg588671.html.
Read
https://lore.kernel.org/all/000401d8a746$3eaca200$bc05e600$@whissi.de/
for all details.
Thank you all for your help!
--
Regards,
Thomas
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