0B4

Explanation
A unit information module (UIM) specified an undefined
device number.

System action
The system issues message IEA525W to identify
the UIM in error. The system enters nonrestartable wait state X'0B4'.

System programmer response
See message IEA525W for the name of
the failing UIM. Check if the failing UIM is an installation-provided
or IBM-provided UIM. If it is an IBM-provided UIM, search problem
reporting databases for a fix for the problem. Provide the following
search argument: WS/D0B4: Wait state code
MS/IEA525W: Message identifier
VAlu/Cuim_name: Message variable text

 If no fix exists, ask the operator to obtain the stand-alone
dump. Contact the IBM® Support
Center. Provide the stand-alone dump.

Source
Input/output supervisor (IOS)