Concrrent request are not completing and running from long time?

When i go and check concurrent manager logfile i found below statements.

Cause: cleanup_node failed due to ORA-00600: internal error code, arguments: [pesldl01_Get_Object: shm_open: errno 2 e

rrmsg No such file or di], [], [], [], [], [], [], [], [], [], [], [].

Symtomps:
Not able to get the sufficient amount of  shared memory.Because of that programs 

are running from long time.

Solution: Bounce database.