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Sun SPARC Enterprise M3000/M4000/M5000/M8000/M9000 (OPL) Servers: "Fast Data Access MMU Miss" error along with BERR/BTO event during boot may be due to root file-system inconsistencies (Doc ID 2149494.1)

Last updated on SEPTEMBER 29, 2017

Applies to:

Sun SPARC Enterprise M9000-64 Server - Version All Versions and later
Sun SPARC Enterprise M4000 Server - Version All Versions and later
Sun SPARC Enterprise M5000 Server - Version All Versions and later
Sun SPARC Enterprise M3000 Server - Version All Versions and later
Sun SPARC Enterprise M8000 Server - Version All Versions and later
Information in this document applies to any platform.

Symptoms

On rare occasions, a root file-system inconsistency or partial corruption on OPL domains can avoid domain from booting, and generate errors during boot attempts that can be misleading and lead to unnecessary hardware replacement.

BERR and/or BTO events can be reported during boot even if no platform hardware is actually faulty.

No degraded or faulted HW should be marked by XSCF for this Document's solution to be applicable

An example is reported below, collected on Domain 0 on a M4000 platform

Jun 15 07:05:48 CEST 2011 {0} ok boot boot-disk
Jun 15 07:05:48 CEST 2011 Boot device: /pci@0,600000/pci@0/pci@9/SUNW,qlc@0/fp@0,0/disk@w202400a0b867732e,0:a File and args: -m verbose
Jun 15 07:05:54 CEST 2011
Jun 15 07:05:54 CEST 2011 ERROR: Last Trap: Fast Data Access MMU Miss
Jun 15 07:05:54 CEST 2011 %TL:1 %TT:68 %TPC:f0038804 %TnPC:f0038808 %TSTATE:886a001600
Jun 15 07:05:54 CEST 2011 %PSTATE:16 ( IE:1 PRIV:1 PEF:1 )
Jun 15 07:05:54 CEST 2011 DSFSR:4280804b ( FV:1 OW:1 PR:1 E:1 TM:1 ASI:80 NC:1 BERR:1 )
Jun 15 07:05:54 CEST 2011 DSFAR:fd8f9000 DSFPAR:413182c07000 D-TAG:0

Logs show a 'Fast Data Access MMU Miss' error along with 'BERR:1', meaning that Bus error response occurred during boot attempt.

Same result while booting from an alternate path to the same boot device (in case of internal HDDs used as system drives, this would not be possible):

Jun 15 06:34:28 CEST 2011 Boot device: /pci@1,700000/SUNW,qlc@0/fp@0,0/disk@202500a0b867732e,0:a File and args: -m verbose
Jun 15 06:34:28 CEST 2011 QLogic QLE2462 Host Adapter FCode(SPARC): 2.01 03/27/08
Jun 15 06:34:32 CEST 2011 Wait for link up - Firmware version 4.03.01
Jun 15 06:34:32 CEST 2011 ERROR: /pci@1,700000/SUNW,qlc@0/fp@0,0: Last Trap: Fast Data Access MMU Miss
Jun 15 06:34:32 CEST 2011 %TL:1 %TT:68 %TPC:f000a428 %TnPC:f000a42c %TSTATE:446a001600
Jun 15 06:34:32 CEST 2011 %PSTATE:16 ( IE:1 PRIV:1 PEF:1 )
Jun 15 06:34:32 CEST 2011 DSFSR:4280804b ( FV:1 OW:1 PR:1 E:1 TM:1 ASI:80 NC:1 BERR:1 )
Jun 15 06:34:32 CEST 2011 DSFAR:fd8f9000 DSFPAR:413182c07000 D-TAG:fffffffc003c4000

BRTO event also possible:

{0} ok boot
Boot device: boot-disk File and args: ""
QLogic QLE2462 Host Adapter FCode(SPARC): 2.01 03/27/08
Firmware version 4.03.01
ERROR: Last Trap: Fast Data Access MMU Miss
%TL:1 %TT:68 %TPC:f0038804 %TnPC:f0038808 %TSTATE:886a001600
%PSTATE:16 ( IE:1 PRIV:1 PEF:1 )
DSFSR:2280804b ( FV:1 OW:1 PR:1 E:1 TM:1 ASI:80 NC:1 BRTO:1 )
DSFAR:fd8f8006 DSFPAR:413180200000 D-TAG:0

 

Cause

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In this Document
Symptoms
Cause
Solution
References

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