NetBSD Problem Report #51988

From mlelstv@tazz.1st.de  Tue Feb 21 01:41:21 2017
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Date: Tue, 21 Feb 2017 02:07:51 +0100 (CET)
From: mlelstv@serpens.de
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To: gnats-bugs@NetBSD.org
Subject: boot fails very early with amd64
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>Number:         51988
>Category:       kern
>Synopsis:       boot fails very early with amd64
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 21 01:45:00 +0000 2017
>Closed-Date:    Fri Dec 01 21:24:44 +0000 2017
>Last-Modified:  Fri Dec 01 21:24:44 +0000 2017
>Originator:     Michael van Elst
>Release:        NetBSD 7.99.60
>Organization:

>Environment:


System: NetBSD tazz 7.99.60 NetBSD 7.99.60 (TAZZ) #15: Tue Feb 21 01:59:35 CET 2017 mlelstv@gossam:/home/netbsd-current/obj.amd64/home/netbsd-current/src/sys/arch/amd64/compile/TAZZ amd64
Architecture: x86_64
Machine: amd64
>Description:
Current no longer boots on a Thinkpad T420 with Core-i5 CPU.

After load the kernel, the display shows garbage and the machine resets.

Bisecting the commits of the last two weeks identifies:

Sat Feb 11 16:02:11 UTC 2017 maxv
   | src/sys/arch/amd64/conf: Makefile.amd64 kern.ldscript
 Put 2MB alignments between the kernel segments. This way the kernel image
 is entirely mapped with large pages, which uniformizes performance and
 reduces fluctuation. Sent on port-amd64.

as the culprit. Revoking that commit makes the kernel boot and work again.

>How-To-Repeat:
Boot current on a Thinkpad T520 with

cpu0: "Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz"

>Fix:


>Release-Note:

>Audit-Trail:

State-Changed-From-To: open->closed
State-Changed-By: maxv@NetBSD.org
State-Changed-When: Fri, 01 Dec 2017 21:24:44 +0000
State-Changed-Why:
I fixed it some months ago already.


>Unformatted:

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