The bit position indicates STATE, STATE-read, for each of the states listed
above, and the character displayed in each indicates:
- '.' acquired while irqs disabled
- '+' acquired in irq context
- '-' acquired with irqs enabled
+ '.' acquired while irqs disabled and not in irq context
+ '-' acquired in irq context
+ '+' acquired with irqs enabled
'?' acquired in irq context with irqs enabled.
Unused mutexes cannot be part of the cause of an error.