Processes Hang Waiting on 'cursor: pin S wait on X' (and other Wait Events) on HP-UX 11.23 and 11.31 Itanium Systems
(Doc ID 580273.1)
Last updated on JULY 05, 2021
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Process hangs indefinitely waiting on one of the following wait events:
- cursor: pin S wait on X (10g wait)
- kksfbc child completion
- SGA: allocation forcing component growth
There is no blocker process.
The variety in wait events is explained by the fact that the underlying issue is with the pw_wait() HP-UX system call.
Therefore, the above list is not exhaustive, use the pstack output below to match the problem in all cases.
The problem is commonly seen on Parallel Execution Worker processes but can affect any Oracle process.
A command to generate a systemstate, processstate, or errorstack dump e.g. via ALTER SESSION or oradebug command frees the hanging process.
An example of the top of the call stack of an affected process, obtained using pstack:
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