A29

Explanation
The system was stopping itself when a program or machine check occurred. While trying to recover
from this program or machine check, another program or machine check occurred. This problem is
probably a software error.

System action
The system enters wait state X'A29'. Processing continues on other processors in the sysplex.

System programmer response
If the problem reporting databases do not show a fix for the problem, contact the IBM® Support Center.

Source
Loadwait/Restart