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IV91110: CF SIGNAL HANDLER INCORRECTLY DETACHED TRACE MEMORY CAUSING ANOTHER THREAD CRASH.

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • The stack of crashed thread can vary, e.g.
    
    (gdb) where
    #0  0x00001000063d0f7c in glm_state::process_existing_lock
    (this=0x10200e3cdc70) at ../server/lock/glm_state.cpp:309
    #1  0x00001000063c6950 in do_set_state (glm_req=..., status=...)
    at ../server/lock/glm_setstate.cpp:609
    #2  0x00001000063c775c in glm_setstate (glm_req=...) at
    ../server/lock/glm_setstate.cpp:301
    #3  0x00001000063c1834 in glm_setlock::process_command
    (this=0x10200e3ce310) at ../server/lock/glm_setlock.cpp:154
    #4  0x00001000063ae454 in glm_do_setlock (work=0x10200e3ce530,
    dscb=0x102007d00000) at ../server/lock/glm_setlock.h:244
    #5  0x00001000063aee50 in glmops (workreq=0x10200e3ce530) at
    ../server/lock/glm_ops.cpp:495
    #6  0x00001000001222f8 in do_work (workreq=0x10200e3ce530) at
    ../server/common/do_work.c:184
    #7  0x00001020085cdfb0 in cf_worker
    (workerParams=0x10200a021858) at
    ../transport/server/udapl/udapl_cf_worker.c:310
    #8  0x0000100007658728 in start_thread () from
    /lib64/power8/libpthread.so.0
    #9  0x0000100007a57ae0 in clone () from /lib64/power8/libc.so.6
    
    The key info is that another thread is executing CF signal
    handler CaSignalHandler() at that time:
    
    #0  0x0000100007a5a614 in shmdt () from /lib64/power8/libc.so.6
    #1  0x0000100000090158 in ?? ()
    #2  0x00001000000920dc in ?? ()
    #3  0x000010000011dbc4 in CaSignalHandler (sig=<optimized out>,
    info=0x10200cd4def8, context=0x10200cd4d180)
        at ../server/common/cfinit.c:575
    #4  <signal handler called>
    #5  cshin (workreq=0x10200cd4e530, ss=0x102007e00000) at
    ../server/cache/cshin.c:359
    #6  0x000010000625dd20 in cshops (workreq=0x10200cd4e530) at
    ../server/cache/cshops.c:752
    #7  0x00001000001222f8 in do_work (workreq=0x10200cd4e530) at
    ../server/common/do_work.c:184
    #8  0x00001020085cdfb0 in cf_worker
    (workerParams=0x1020089d31e8) at
    ../transport/server/udapl/udapl_cf_worker.c:310
    #9  0x0000100007658728 in start_thread () from
    /lib64/power8/libpthread.so.0
    #10 0x0000100007a57ae0 in clone () from /lib64/power8/libc.so.6
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 11.1 Mod 2 Fix Pack 2 or higher               *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 11.1 Mod 2 Fix Pack 2
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV91110

  • Reported component name

    DB2 PURESCALE F

  • Reported component ID

    5724Y6900

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-11-30

  • Closed date

    2017-10-03

  • Last modified date

    2017-11-03

  • 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

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
31 July 2020