IBM Support

IC65521: SERVER HANGS IN CHECKPOINT -- XCHG_* THREADS WAITING FOREVER IN CRITICAL SECTION DURING CREATE INDEX

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APAR status

  • Closed as program error.

Error description

  • Server is hanging in checkpoint, two threads are sleeping while
    in critical section:
    
    Stack for thread: 5123 xchg_2.1
     base: 0x000000027898d000
      len:   69632
       pc: 0x0000000140b45bcb
      tos: 0x000000027899d210
    state: sleeping
       vp: 1
    
    NT_yield_processor_mvp (66e95170, 0, 6a5a1fc8, 0)
    mt_yield (1, 80efcc40, 1, 1)
    wait_4_Qbuf (7899d508, 0, 1, 10)
    get_empty_Qbufh (0, 7899d508, 0, 146)
    wrt_minibin (e, 6a41b020, 7899d5d0, 7899d580)
    next_sort (6a4de830, 40b947b0, 407cf350, 6efcbaa0)
    prod_loop1 (1, 0, 407cf350, 0)
    producer_thread (6efcbfc0, 1, 1, 6a4de810)
    startup (4, 0, 0, 8000000)
    
    and
    
    Stack for thread: 5124 xchg_2.2
     base: 0x0000000275221000
      len:   69632
       pc: 0x0000000140b45bcb
      tos: 0x0000000275231210
    state: sleeping
       vp: 3
    
    NT_yield_processor_mvp (6a5a1f80, 0, 6a5a1fc8, 0)
    mt_yield (1, 0, 1, 1)
    wait_4_Qbuf (75231508, 0, 1, 10)
    get_empty_Qbufh (0, 75231508, 0, 146)
    wrt_minibin (e, 6a41d010, 752315d0, 75231580)
    next_sort (80efc580, 40b947b0, 407cf350, 6efcbaa0)
    prod_loop1 (1, 0, 407cf350, 0)
    producer_thread (79d8f4e0, 2, 2, 80efc560)
    startup (0, 0, 0, 1000)
    
    This is the mb_collector thread for those two.
    
    Stack for thread: 5120 mb_collector
     base: 0x0000000286be3000
      len:   69632
       pc: 0x0000000140b45bcb
      tos: 0x0000000286bf3620
    state: cond wait
       vp: 3
    
    NT_yield_processor_mvp (928b45b0, 85, 30303030, 42313238)
    mt_fast_wait (928b4628, 928b45b0, 2, 821bb440)
    critblockflags (9282c000, 0, 10, 0)
    critwait (821bb438, 821bb440, 10, 821bb438)
    stmp_build_in (68b923a0, 19, 28, 0)
    stmp_build_exclusive (40dc26c0, 40dc26b4, 821bb420, 10)
    srtmakrawrun (1, 1, 6ea32550, 6a37a610)
    srtmakrun (7890af10, 0, 0, 741f74b0)
    srtoutput (1, 0, 0, 2)
    srtwrite (2, 6a41fd88, 6a634d20, 692d1b60)
    create_distrib (6a3eddb0, 0, 10, 6a41fd88)
    startup (7, 0, 0, 1000)
    
    The server is deadlocked/hung and this looks like
    idsdb00161011, which was fixed for the case of a pending
    checkpoint.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * IDS users                                                    *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * The server could hang during index creation. The main_loop   *
    * thread will appear to be running forever and other threads   *
    * will be seen waiting for DYNAMIC_LOG condition to be         *
    * cleared.                                                     *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to IDS 11.50xC7 and above.                           *
    ****************************************************************
    

Problem conclusion

  • Problem is fixed in IDS 11.50xC7.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC65521

  • Reported component name

    IBM IDS ENTRP E

  • Reported component ID

    5724L2304

  • Reported release

    B15

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-01-12

  • Closed date

    2010-10-01

  • Last modified date

    2010-10-01

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

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

Fix information

  • Fixed component name

    IBM IDS ENTRP E

  • Fixed component ID

    5724L2304

Applicable component levels

  • RB15 PSY

       UP

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Document Information

Modified date:
01 October 2010