/keybase folder becomes corrupted regularly

I'm running Debian/Trixie on an AMD64 system. This issue has been cropping up intermittently for about a year now.

The symptom is that ls -l / hangs. I usually notice this in the folders panel of Dolphin first. It shows up after a reboot - prior to that I haven't noticed any problems. After a reboot, I may not see any folders in the folders panel and can't "ls -l /". The fix I've settled on is to "tune2fs -c 1" on the root device (in my case an mdadm raid 1 array of two nvme devices). After a reboot, it fixes whatever whatever caused the problem, although I've not seen any substantial change showing in the output from fsck.

For some background, I use UEFI boot, with 2 nvme drives each having a FAT partition and a RAID partition. The two FAT partitions are synced when the computer is shutdown so I should always have a bootable EFI partition even if one drive fails.

Start by examining the Debian/Trixie environment and the reported sequence around reboot, `ls -l /`, `tune2fs -c 1`, and fsck. The issue mentions an mdadm RAID 1 array with NVMe devices and FAT/UEFI partitions, but no repository files or tests. Done would require identifying the cause of the intermittent `/keybase` corruption and documenting a reliable fix.

Written by the indexing model from the issue text.