IV21415: CRASH IN SNA_V5ROUTER

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Communications Server for AIX and Linux
    ---------------------------------------
    Crash in sna_v5router
    

Local fix

Problem summary

  • USERS AFFECTED: All.
    
    PROBLEM DESCRIPTION:
    CRASH INFORMATION:CPU 2 CSA F0047BE0 at time of crash, error
    code for LEDs: 70000000
    pvthread+000C00 STACK:
    [032E0F0C]sna_v5router:nrm_ps_to_rm_rec+000190 (7A2C136C,
    372FFCFC)
    [032E1988]sna_v5router:nrm_queue_handler+00009C (7A2C136C,
    00040004, 372FFCFC)
    [0311A51C]sna_v5router:nba_dispatch_input+00027C (38DEE498,
    372FFCFC)
    [0311ABE4]sna_v5router:nba_dispatch_process+0000C4 (38DEE498,
    372FFCFC)
    [0311B3D8]sna_v5router:nba_scheduler+0001FC ()
    [0310D51C]sna_v5router:vpr_stream_uw_drive_scheduler+000028 ()
    [0310DA08]sna_v5router:vpr_stream_uw_svc+000120 (726C5494)
    [028E23B8]pse:sq_wrapper+000164 (??)
    [028CEB44]pse:csq_run+000524 (??)
    [028CD8B4]pse:csq_lateral+00009C (??, ??, ??)
    [028E2C80]pse:scheduled_run+0000B8 ()
    [001D4F18]Netintr+0001A0 ()
    [001D4D34]netisr_thread+000014 ()
    [00152534]threadentry+000014 (??, ??, ??, ??)
    
    PROBLEM SUMMARY:
    There is a very small window when two transactions (one on each
    end of the session) are initiated at the same time. If the
    session is a contention loser on the CSAIX end, and the remote
    end sends a complete conversation (BB and CEB) at the same time
    that CSAIX sends a BID to initiate a conversation, those can
    cross and be valid. If those two events are processed in the
    node under the same callback interrupt, then the processing for
    them gets interleaved, causing a crash.
    
    The window of opportunity for this crash is very, very small.
    

Problem conclusion

  • Internal code has been modified to properly handle this
    situation. Due to differences in DLC code between AIX and Linux,
    it is believed that this problem can not occur on Linux, but the
    fix will be applied to CS Linux, anyway.
    

Temporary fix

  • sna_v5router
    

Comments

APAR Information

  • APAR number

    IV21415

  • Reported component name

    CS AIX V6.X

  • Reported component ID

    5765E5100

  • Reported release

    640

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-05-17

  • Closed date

    2012-05-17

  • Last modified date

    2012-09-11

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

    IV03534

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

Fix information

  • Fixed component name

    CS AIX V6.X

  • Fixed component ID

    5765E5100

Applicable component levels

  • R640 PSY U851826

       12/09/11 I 1000



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Document information


More support for:

Communications Server for AIX

Software version:

640

Reference #:

IV21415

Modified date:

2012-09-11

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