Thanks Stephan for the clue. I have enabled CBT manually in my vCenter. So, now, I use the vmware_cbt_tool.py tool to resetcbt, or disablecbt/enablecbt on the VM, but this does not change the error. Of course, I have checked that there was no snapshot on my VM. I also use the tool on a fresh VM, never CBTed. And backup also failed, with same kind of error message, on the corresponding disk.
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