IBM DB2 database fails on T5120/T5220 with system firmware version 7.0.3.b due to dmmu fault addresses not sign-extended.

Asset ID:	1-73-1019111.1
Update Date:	2010-08-17
Keywords:

Solution Type FAB (standard) Sure

Solution 1019111.1 : IBM DB2 database fails on T5120/T5220 with system firmware version 7.0.3.b due to dmmu fault addresses not sign-extended.

1. Impact

IBM DB2 database fails on Sun SPARC Enterprise T5120/T5220 (Huron) with system firmware version of 7.0.3.b. The memory management unit (MMU) fault status area contains a truncated virtual address (VA) and the Solaris code for handling the special misaligned trap does not function correctly.

2. Contributing Factors

Sun SPARC Enterprise T5120/T5220 (Huron) with system firmware version of 7.0.3.b is affected.

3. Symptoms

Example error message shown below:

MMU_FAULT_AREA_INFO_05: mmu_fault_area_info() proper VA in MMU fault area run cpu = 0
...
MMU fault status area has unexpected data
Expected trap = TT_ALIGN (va = ffff800000000004 ctx = 1)
Expected fault-type: e
DFC = 0x0 IFC = 0x0
DFT = 0xe IFT = 0x0
DFA = 0x800000000004 IFA = 0x0
Offset Value
0x0 0
0x8 0
0x10 0
0x18 0
0x20 0
0x28 0
0x30 0
0x38 0
0x40 e
0x48 800000000004
0x50 0
0x58 0
0x60 0
0x68 0
0x70 0
0x78 0
...
MMU_FAULT_AREA_INFO_05 FAIL: mmu_fault_area_info() proper VA in MMU fault area

4. Root Cause

IBM DB2 fails on Huron due to a lddf (load double floating-point) from a 4-byte but not 8-byte aligned address. The memory management unit fault status area contains a truncated virtual address and the Solaris code for handling the special lddf/stdf (load double floating-point/store double floating-point) misaligned trap does not function correctly.

The dmmu_err code needed to sign-extend the 48-bit virtual address before passing it to the guest via the Dynamic Memory Management Unit (DMMU) fault status area.

5. Corrective Action

Workaround

No workaround available. See Resolution section below.

Resolution

This issue was resolved with system firmware 7.0.3.c, which was released as patch 127580-03.

To avoid or resolve this issue the customer should apply patch 127580-03 (or later).

Note: At the time of FAB publication this patch was at -05.

References:

BugID: 6620096
Patch: 127580-03

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SSG WGS (Workgroup Systems) SSG SW (Platform Software)

Internal Sun Alert & FAB Admin Info
19-Mar-2008: Started initial draft but awaiting response from Submitter on Error Msg details.
20--Mar-2008: No response from Submitter - going with what I have. Sending to Ext Rvw.
25-Mar-2008: Positive feedback - sending to Publish.
12-Dec-2009: Replaced Product with Swordfish Nomenclature

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