Constant System freeze [BTRFS related]

What is missing here, from my point of view, are LUKS flags.

This is how it looks in my case:

setup status /dev/mapper/Samsung-SSD-970-EVO-Plus-1TB
/dev/mapper/Samsung-SSD-970-EVO-Plus-1TB is active and is in use.
  type:    LUKS2
  cipher:  aes-xts-plain64
  keysize: 512 [bits]
  key location: keyring
  device:  /dev/nvme2n1p3
  sector size:  512 [bytes]
  offset:  32768 [512-byte units] (16777216 [bytes])
  size:    1829560320 [512-byte units] (936734883840 [bytes])
  mode:    read/write
  flags:   discards no_read_workqueue no_write_workqueue

discard is important for any ssd or nvme. Otherwise you can not trim the drive.
no_read_workqueue and no_write_workqueue are performance relevant.

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