[Bug 209869] New: Kernel 5.10-rc1 fails to boot on a PowerMac G4 3, 6 at an early stage

[Bug 209869] New: Kernel 5.10-rc1 fails to boot on a PowerMac G4 3, 6 at an early stage

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=209869

            Bug ID: 209869
           Summary: Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at
                    an early stage
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 5.10-rc1
          Hardware: PPC-32
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-32
          Assignee: platform_ppc-32@kernel-bugs.osdl.org
          Reporter: erhard_f@mailbox.org
        Regression: Yes

Created attachment 293201
  --> https://bugzilla.kernel.org/attachment.cgi?id=293201&action=edit
kernel .config (5.10-rc1, PowerMac G4 DP)

With current 5.10-rc1 my PowerMac G4 DP fails to boot. The kernel gets
decompressed but shortly afterwards the machine freezes, displaying in black
letters on a white screen:

done
found display   : /pci@f0000000/ATY,AlteracParent@10/ATY,Alterac_B@1,
opening...

Kernel 5.9.1 works well on this machine, the kernel .config was carried over
from 5.9.1 with make oldconfig.

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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https://bugzilla.kernel.org/show_bug.cgi?id=209869

Christophe Leroy (christophe.leroy@csgroup.eu) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |christophe.leroy@csgroup.eu

--- Comment #1 from Christophe Leroy (christophe.leroy@csgroup.eu) ---
Could you try reverting commit
https://github.com/linuxppc/linux/commit/69a1593abdbcf03a76367320d929a8ae7a5e3d71
?

I got another report from someone who has the same problem and bisected it to
that commit.

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #2 from Erhard F. (erhard_f@mailbox.org) ---
Yes, reverting this commit (on top of -rc1) makes the G4 boot again. Did not
try -rc2 though.

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #3 from Christophe Leroy (christophe.leroy@csgroup.eu) ---
Ok, thanks for the verification. I'm still having hard time understand what the
problem can be. That commit sets up at all time the early hash table that was
previously only set up when CONFIG_KASAN was set. As far as I remember, you
tried KASAN many times.

Could you test whether CONFIG_KASAN works:
- on 5.10-rc1 with that commit reverted ?
- on 5.9 ?

If CONFIG_KASAN is already broken on 5.9, are you able to find the last kernel
version on which CONFIG_KASAN works ?

Thanks
Christophe

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #4 from Erhard F. (erhard_f@mailbox.org) ---
(In reply to Christophe Leroy from comment #3)
> Could you test whether CONFIG_KASAN works:
> - on 5.10-rc1 with that commit reverted ?
> - on 5.9 ?

KASAN works in both cases. I'll attach kernel dmesg and config.

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #5 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 293495
  --> https://bugzilla.kernel.org/attachment.cgi?id=293495&action=edit
kernel .config (5.10-rc1 + KASAN, PowerMac G4 DP)

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #6 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 293497
  --> https://bugzilla.kernel.org/attachment.cgi?id=293497&action=edit
dmesg (5.10-rc1 + patch reverted + KASAN, PowerMac G4 DP)

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #7 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 293499
  --> https://bugzilla.kernel.org/attachment.cgi?id=293499&action=edit
kernel .config (5.9.3 + KASAN, PowerMac G4 DP)

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #8 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 293501
  --> https://bugzilla.kernel.org/attachment.cgi?id=293501&action=edit
dmesg (5.9.3 + KASAN, PowerMac G4 DP)

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #9 from Christophe Leroy (christophe.leroy@csgroup.eu) ---
Ok, what about 5.10-rc1 + KASAN without reverting the patch ?

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #10 from Erhard F. (erhard_f@mailbox.org) ---
(In reply to Christophe Leroy from comment #9)
> Ok, what about 5.10-rc1 + KASAN without reverting the patch ?
Nope, does not boot. Same 5.10-rc1 .config + KASAN but without reverting the
patch.

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #11 from Christophe Leroy (christophe.leroy@csgroup.eu) ---
Can (In reply to Erhard F. from comment #10)
> (In reply to Christophe Leroy from comment #9)
> > Ok, what about 5.10-rc1 + KASAN without reverting the patch ?
> Nope, does not boot. Same 5.10-rc1 .config + KASAN but without reverting the
> patch.

Can you test patch at
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/9e225a856a8b22e0e77587ee22ab7a2f5bca8753.1604740029.git.christophe.leroy@csgroup.eu/

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #12 from Erhard F. (erhard_f@mailbox.org) ---
I can confirm the patch fixes booting 5.10-rc1 on my G4, with and without
KASAN. Thanks!

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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Michael Ellerman (michael@ellerman.id.au) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |michael@ellerman.id.au
         Resolution|---                         |CODE_FIX

--- Comment #13 from Michael Ellerman (michael@ellerman.id.au) ---
Fixed in:
  01776f070ffc ("powerpc/32s: Use relocation offset when setting early hash
table")

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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--- Comment #14 from Erhard F. (erhard_f@mailbox.org) ---
Thanks!

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[Bug 209869] Kernel 5.10-rc1 fails to boot on a PowerMac G4 3,6 at an early stage

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https://bugzilla.kernel.org/show_bug.cgi?id=209869

Michael Ellerman (michael@ellerman.id.au) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #15 from Michael Ellerman (michael@ellerman.id.au) ---
And the fix is in mainline as of v5.10-rc6.

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