DY47789: CANCEL OF TCP/IP PARTITION MAY LEAD TO SYSTEM HANG WAITING FOR LTA

APAR status

• Closed as fixed if next.

Error description

• Canceling a TCP/IP partition while it is owning the LTA may
  cause the task owning the LTA to enter an infinite wait for I/O
  on OSAX devices. This causes the cancel of the partition to hang
  and prevents the LTA from being released. This finally causes
  the whole system to hang sooner or later as other tasks start to
  wait infinitely for the LTA.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: all users of TCP/IP                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Canceling a TCP/IP partition while it is owning the LTA may
  cause the task owning the LTA to enter an infinite wait for I/O
  on OSAX devices. This causes the cancel of the partition to hang
  and prevents the LTA from being released. This finally causes
  the whole system to hang sooner or later as other tasks start to
  wait infinitely for the LTA.
  
  Example:
  CANCEL F7,NODUMP
  AR 0015 1I40I READY
  ...
  F7 0101 0S12I MAIN TASK TERMINATION
  F7 0101 0S08I LOG. TRANS. AREA CANCELED, PHASE = <LTA-PHASE>
  F7 0101 0S00I SUB DRIVER CANCELED
  F7 0101 0S07I LOG. TRANS. AREA PSW = <PSW-IN-LTA>
  ...
  F7 0007 0S01I THE OPERATOR CANCELED THE JOB
  F7 0007 0S00I JOB TCPIP00 CANCELED
  F7 0007 0S07I PROBLEM PROGRAM PSW = <PSW>
  ...
  STATUS F7
  AR 0015 S0065-F7 DRIVER 82 WAITING FOR I/O ON DEVICE=D00
  AR 0015 TCB=... TIB=... SAV=<LTA-SAVEAREA>
  AR 0015 M0028 F7 TCPIP00 8C WAITING FOR SUB-TASK TERMINATION
  AR 0015 TCB=... TIB=... SAV=<PARTITION-SAVEAREA>
  AR 0015 SCB=... PCB=... COM=...
  AR 0015 1I40I READY
  

Problem conclusion

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  DY47807 DY47808

Fix information

Applicable component levels

• R52C PSN

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