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S-Series I/O module "detects a recoverable error FAP21V_MMU_CRC_ERR..."

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TitleS-Series I/O module "detects a recoverable error FAP21V_MMU_CRC_ERR..."
Symptoms
syslog reports message similar to:
<3>Dune[5.dTcmTask]FAP 3, slot 5 detects a recoverable error FAP21V_MMU_CRC_ERR(4) (reg=0x00000002) ... auto-recovery.

and in the faultlog the following:

==============================================================================
Message   5/92   Syslog Message            08.22.04.0006   06/14/2016 21:12:20
    <0>Dune[2.dTcmTask]This blade's fabric adapter (fap_idx=1) is detecting 
    an excessive number of recoverable memory errors.  The blade is reset. (
     0x00dcd7d0 0x012c9004 0x013038a4 0x01303b50 0x019ee424 0xeeeeeeee )
==============================================================================
Message   6/92   Syslog Message            08.22.04.0006   06/14/2016 21:12:18
    <3>Dune[2.dTcmTask]This blade's fabric adapter (fap_idx=1) is detecting 
    an excessive number of recoverable memory errors.  The blade is reset.
==============================================================================
Message   7/92   Syslog Message            08.22.04.0006   06/14/2016 01:50:50
    <3>Dune[2.dTcmTask]FAP 1, slot 2 detects a recoverable error FAP21V_MMU_
    CRC_ERR(7)	(reg=0x00000001) ... auto-recovery.
==============================================================================
Message   8/92   Syslog Message            08.22.04.0006   06/13/2016 16:49:14
    <3>Dune[2.dTcmTask]FAP 1, slot 2 detects a recoverable error FAP21V_MMU_
    CRC_ERR(5)	(reg=0x00000001) ... auto-recovery.
==============================================================================

Once the blades fabric adapter detects an excessive number of recoverable memory errors it will reset the blade and will log this message when it resets

 
Message 7/154 Syslog Message 08.22.01.0023 07/11/2016 22:18:33 

<0>Dune[13.tusrAppInit]0x01223ad0 0x01223ad0 0x0123cbe8 0x012faf30 0x013 
e4c4c 0x013e4d18 0x013e4f3c 0x013e1b50 0x013649e4 0x0126d800 0x0126cc38 
0x0124a644 0x0045345c 0x0283c8d8 0x0283e78c 0x028488c0 0x00b3b550 0x0314 
4fe4 0x02846768 0x02830518 0x02847154 0x00957f04 0x019ed524 0xeeeeeeee ( 
0x00dcca24 0x01223684 0x01223b04 0x0123cbe8 0x012faf30 0x013e4c4c 0x013 
e4d18 0x013e4f3c 0x013e1b50 0x013649e4 0x0126d800 0x0126cc38 0x0124a644 
0x0045345c 0x0283c8d8 0x0283e78c 0x028488c0 0x00b3b550 0x03144fe4 0x0284 
6768 0x02830518 0x02847154 0x00957f04 0x019ed524 0xeeeeeeee )
 

 
Environment
  • S-Series
  • Firmware all
Cause
  • Memory error
  • Potentially Faulty hardware in the FAP chip
Resolution
Please contact GTAC for technical assistance. 
 
Additional notes
recent article was archived since information regarding S-Series Reports "Dune[x.dTcmTask]FAP 1" Errors
is now included in this article.  

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