kern/162110: Releng_9 panics on boot in IGB driver - regression from 8.2

[Frank Terhaar-Yonkers]

>Number:         162110
>Category:       kern
>Synopsis:       Releng_9 panics on boot in IGB driver - regression from 8.2
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Oct 28 19:50:08 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Frank Terhaar-Yonkers
>Release:        Releng_9 CVSUP 2011-October-28
>Organization:
Cisco
>Environment:
FreeBSD fty-zfs-01 9.0-RC1 FreeBSD 9.0-RC1 #1: Fri Oct 28 06:50:23 EDT 2011     toot at fty-zfs-01:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
if_igb driver panics during bootup.

The IGB driver probes the device at line 591 of if_igb.c and punts:
                if (e1000_validate_nvm_checksum(&adapter->hw) < 0) {
                        device_printf(dev,
                            "The EEPROM Checksum Is Not Valid\n");
                        error = EIO;
                        goto err_late;
                }

The kernel immediately panics with a page fault.  The trace-back show it's in the if_igb driver as the console messages suggest.

Releng_8 did not panic, so this is a regression.  The IGB NIC most likely has some sort of problem which is properly diagnosed.

Email me if you want the screen shot of the panic, or have a fix to try out.

>How-To-Repeat:
Crashes every time on boot.
>Fix:
Disabled compile of if_igb.c driver, system boots fine.

>Release-Note:
>Audit-Trail:
>Unformatted: