NetBSD Problem Report #59550

From gson@gson.org  Thu Jul 24 16:50:39 2025
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Date: Thu, 24 Jul 2025 19:50:30 +0300 (EEST)
From: gson@gson.org (Andreas Gustafsson)
Reply-To: gson@gson.org (Andreas Gustafsson)
To: gnats-bugs@NetBSD.org
Subject: Power Mac G5 boot regression
X-Send-Pr-Version: 3.95

>Number:         59550
>Category:       port-macppc
>Synopsis:       Power Mac G5 boot regression
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-macppc-maintainer
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jul 24 16:55:01 +0000 2025
>Closed-Date:    Fri Jul 25 08:03:40 +0000 2025
>Last-Modified:  Fri Jul 25 08:03:40 +0000 2025
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:

>Environment:
System: NetBSD
Architecture: powerpc
Machine: macppc
>Description:

The modified POWERMAC_G5 kernel I recently managed to boot on a Power
Mac G5 as described in PR 59529 no longer boots since this commit:

  2025.07.20.09.41.19 martin src/sys/arch/macppc/conf/GENERIC 1.383

  Enable PAX_ASLR

The last output from OFW is:

  loading .data, done..
  clearing .bss, done..

  Invalid memory access at    $SRR0:  00000000.00e00384      $SRR1:  10000000.00003030
   ok
  0 >

where the "$" is actually a character I don't recognize.

This is booting from a CD containing ofwboot.xcf and the kernel, both
built from the same -current sources.  Since the error happens so
early, I suspect this is a problem with ofwboot.xcf rather than the
kernel.

Reverting the commit makes the boot work again.

>How-To-Repeat:

>Fix:

>Release-Note:

>Audit-Trail:
From: Martin Husemann <martin@duskware.de>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: port-macppc/59550: Power Mac G5 boot regression
Date: Thu, 24 Jul 2025 19:17:01 +0200

 On Thu, Jul 24, 2025 at 04:55:02PM +0000, Andreas Gustafsson wrote:
 >   Enable PAX_ASLR
 > 
 > The last output from OFW is:
 > 
 >   loading .data, done..
 >   clearing .bss, done..
 > 
 >   Invalid memory access at    $SRR0:  00000000.00e00384      $SRR1:  10000000.00003030
 >    ok
 >   0 >
 > 
 > where the "$" is actually a character I don't recognize.

 This is very strange as PAX_ASLR in this context is plain userland and nothing
 in the kernel should really change (modulo minor address difference due to
 a bit additional code being compiled in).

 Defintively it should not interfere with ofwboot and this early boot stage.

 Martin

From: "Martin Husemann" <martin@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/59550 CVS commit: src/sys/arch/macppc/stand/ofwboot
Date: Fri, 25 Jul 2025 06:18:24 +0000

 Module Name:	src
 Committed By:	martin
 Date:		Fri Jul 25 06:18:24 UTC 2025

 Modified Files:
 	src/sys/arch/macppc/stand/ofwboot: Makefile

 Log Message:
 PR 59550: do not build ofwboot as PIE.
 While there, disabel all sanitziers too.


 To generate a diff of this commit:
 cvs rdiff -u -r1.61 -r1.62 src/sys/arch/macppc/stand/ofwboot/Makefile

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

From: Martin Husemann <martin@duskware.de>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: port-macppc/59550: Power Mac G5 boot regressiony
Date: Fri, 25 Jul 2025 08:19:47 +0200

 On Thu, Jul 24, 2025 at 04:55:02PM +0000, Andreas Gustafsson wrote:
 > The modified POWERMAC_G5 kernel I recently managed to boot on a Power
 > Mac G5 as described in PR 59529 no longer boots since this commit:
 > 
 >   2025.07.20.09.41.19 martin src/sys/arch/macppc/conf/GENERIC 1.383
 > 
 >   Enable PAX_ASLR

 I just double checked and at least the in-tree version of POWERMAC_G5
 currently does NOT include GENERIC, so PAX_ASLR is still not used on G5
 machines.

 I tested, and it works for me, so I added it now belatedly.

 However, could it be that your bisection blamed the neighbour commit
 accidently?

 I could understand the PIE change I commited minutes before the above
 change could break ofwboot (which is trivial to fix).

 I have commited a candidate fix for that, could you retry with latest
 current?

 If that is not the case, can you please provide the change you did
 to POWERMAC_G5 and dmesg output from a working boot?

 Thanks,

 Martin

From: Andreas Gustafsson <gson@gson.org>
To: gnats-bugs@netbsd.org
Cc: port-macppc-maintainer@netbsd.org,
    gnats-admin@netbsd.org
Subject: Re: port-macppc/59550: Power Mac G5 boot regressiony
Date: Fri, 25 Jul 2025 09:51:49 +0300

 Martin Husemann via gnats wrote:
 >  However, could it be that your bisection blamed the neighbour commit
 >  accidently?

 I think you're right.  My tests showed that source date
 2025.07.20.00.36.08 booted successfully and 2025.07.20.09.41.19
 didn't, but somehow I missed that there was one more commit
 between them 2025.07.20.09.33.11 and failed to test that one.
 Sorry about the confusion.

 >  I have commited a candidate fix for that, could you retry with latest
 >  current?

 Will do.
 -- 
 Andreas Gustafsson, gson@gson.org

State-Changed-From-To: open->closed
State-Changed-By: gson@NetBSD.org
State-Changed-When: Fri, 25 Jul 2025 08:03:40 +0000
State-Changed-Why:
An unmodified POWERMAC_G5 kernel now boots and gets as far as
prompting for the root device.  Thanks!


>Unformatted:

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