s390dbf.ee54db <level> is not a valid level for a debug feature
Explanation
Setting a new level for a debug feature by using the 'level' sysfs attribute
failed. Valid levels are the minus sign (-) and the integers in the
range 0 to 6. The minus sign switches off the feature. The numbers switch
the feature on, where higher numbers produce more debug output.
User response
Write a valid value to the 'level' sysfs attribute.