Sun Storage 2500-M2 Arrays: Controller Reboots due to (tNtbErrPolling): PANIC: PLX NTB

Asset ID:	1-72-2101426.1
Update Date:	2016-03-10
Keywords:

Solution Type Problem Resolution Sure

Solution 2101426.1 : Sun Storage 2500-M2 Arrays: Controller Reboots due to (tNtbErrPolling): PANIC: PLX NTB

Applies to:

Sun Storage 2530-M2 Array - Version Not Applicable to Not Applicable [Release N/A]
Sun Storage 2540-M2 Array - Version Not Applicable to Not Applicable [Release N/A]
Information in this document applies to any platform.

Symptoms

Sun Storage 2500-M2 Arrays running firmware version 07.84.47.10 or above can panic with an error similar to the one below. The excLogShow output of stateCaptureData.dmp file shows the following PANIC string:

(tNtbErrPolling): PANIC: PLX NTB Port 4 reg 0x00004a20 changed, original val 0x00001880, current val 0x00000880

Cause

The NTB panic was due to a correctable single bit PCI error. The firmware periodically scans the PCI registers to detect the bit flips. The single bit PCI error points to a hardware problem on the PCI switch of the controller. If a bit flip is detected, the respective controller will be rebooted with the below PANIC:

Executing excLogShow(0,0,0,0,0,0,0,0,0,0) on controller A:

================= EXCEPTION LOG =================
Serial number: SV22524408
Entry count: 3
Wrap-arounds: 0
First entry time:
Current date/time: DEC-24-2015 09:18:02 PM

---- Log Entry #1 DEC-23-2015 11:05:30 PM ----
12/23/15-23:07:11 (tNtbErrPolling): PANIC: PLX NTB Port 4 reg 0x00004a20 changed, original val 0x00001880, current val 0x00000880

Stack Trace for tNtbErrPolling:
0x0025ffac vxTaskEntry +0x5c : vkiTask (0x11000308)
0x0016844c vkiTask +0xec : ntbErrPolling ()
0x00143c20 ntbErrPolling+0x2a0: ntbRegCompare (0x4, 0xd80e68)
0x00143000 ntbRegCompare+0x100: _vkiCmnErr ()
0x00163544 _vkiCmnErr +0x104: 0x00163780 (0x585580, 0x4f8be0, 0xd7cb90)
0x00163b04 vkiLogShow +0x544: psvJobAdd (0x1648a0, 0xd7ccf0, 0, 0)
0x00148c04 psvJobAdd +0x64 : msgQSend ()
0x00402714 msgQSend +0x61c: taskUnlock ()

Also the following major events will be seen as shown below:

A:Thu Dec 24 08:06:24 JST 2015 : 7795 : 0/0/0 : 2606 : Notification : Controller : Tray.99.Controller.A : Start-of-day routine begun
A:Thu Dec 24 08:07:00 JST 2015 : 7825 : 0/0/0 : 2605 : Notification : Controller : Tray.99.Controller.A : Start-of-day routine completed

Solution

This PANIC string points to a hardware issue on the PCI switch of the controller. There is no firmware fix for this as it is a hardware issue.

No need to replace any hardware if this is the first occurrence.
If this issue continues to occur even if it is correctable, the controller should be replaced.

References

<BUG:22670068> - CONTROLLER REBOOTS DUE TO : PANIC: PLX NTB

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