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PM03154: SMTP HANG WAITING ON TIMER ECB POST.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • SMTP running normally. At some point it stops reading mail on
    the JES queue. Customer had SPOOLPOLLINTERVAL timer set to 10
    seconds. Review of the dump showed that the JES timer control
    block was not re-establishing the timer.
    

Local fix

  • Raise SPOOLPOLLINTERVAL to at least the 30 second default
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of the IBM Communications Server   *
    *                 for z/OS Version 1 Release(s) 10, and 11     *
    *                 IP: SMTP                                     *
    ****************************************************************
    * PROBLEM DESCRIPTION: SMTP stops processing mail from the JES *
    *                      spool when a timer interrupt is lost.   *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    SMTP stops processing mail from the JES spool when timer
    interrupt is lost. The SMTP configuration statement
    SPOOLPOLLINTERVAL sets the amount of time to wait between
    polling the JES queue for work. The default is 30 seconds. If
    this time is shortened and the SMTP task is delayed there is
    a small window where the timer ECB is cleared after resetting
    the timer. Clearing the ECB after the timer is reset can cause
    a timer pop to be lost and the SMTP application waits forever
    for the ECB to be posted again.
    +-------------------------------------------------------------+
    + Please check our Communications Server for OS/390 homepages +
    + for common networking tips and fixes.  The URL for these    +
    + homepages can be found in Informational APAR II11334.       +
    +-------------------------------------------------------------+
    

Problem conclusion

  • SMTP code has been amended to clear the ECB prior to resetting
    timer.
    
    * Cross Reference between External and Internal Names
    EZACA027 (MVPSSIW )  EZACA027 (MVPSSIW )
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM03154

  • Reported component name

    TCP/IP V3 MVS

  • Reported component ID

    5655HAL00

  • Reported release

    1A0

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2009-12-09

  • Closed date

    2010-01-07

  • Last modified date

    2010-02-01

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

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

    UK53404 UK53405

Modules/Macros

  • EZACA027
    

Fix information

  • Fixed component name

    TCP/IP V3 MVS

  • Fixed component ID

    5655HAL00

Applicable component levels

  • R1A0 PSY UK53404

       UP10/01/28 P F001

  • R1B0 PSY UK53405

       UP10/01/28 P F001

Fix is available

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Document Information

Modified date:
01 February 2010