I have just started to try out Fedora31 on some of our systems.
I am using a bit of an unusual, manual install method copying an image of the rootfs to the disk and configuring this, (this may be related to my issue, but I have been using the same system for 6 years or more). The particular hardware platform is a bit complicated using a PCIe card with NVMe disk and two SATA disks. It has to boot (BIOS boot and /boot) from one of the SATA disks and then uses the rootfs system on the NVMe disk. I don't think that is related to the the issue though.
The issue is that when I run "grub2-mkconfig -o /boot/grub2/grub.cfg" to manually configure grub2, this process hangs. There is a process grub2-mount that is sitting there using 100% of a CPU core. Not sure what this process does (seems new after Fedora29) but it is passed the /dev entry for a disk partition some presumably mounts the file system and "probes" for what OS is installed there. The file system it hangs on (if you kill the grub2-mount process it will hang on another drive), is easily mountable without any issues.
It seems like there is some bug in this grub2-mount program. Has anyone else seen this or have any ideas what might be the issue.
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