powermac kernel freezes on CURRENT

[Andreas Tobler-3]

Hi all,

I have here a strange issue.
My setup are a powerpook G4 and a imacDV with a G3. I try to boot
CURRENT kernel, atm rev: 193648. GENERIC, WITNESS and INVARIANTS
enabled/disabled, does not matter.

I can boot the kernel successfully and login to the machines via ssh.
But as soon as I try to login via console/kbd I get a freeze w/o a
notice why. The machines are dead as soon as I press a key on the
keyboard. The mouse is working ok before pressing a key.

There is _no_ message in the logs about...

On the imac, the kbd is usb. On the Powerbook, the kbd is adb.

The last working kernel I have is from 20090531, the rev with the dfs
driver.

I did not find an obvious candidate causing this, at least on the
powerpc part.

Does anyone else see such a behavior?

TIA,
Andreas
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[Justin Hibbits-2]

On Sun, Jun 7, 2009 at 4:44 PM, Andreas Tobler<andreastt@...> wrote:

> Hi all,
>
> I have here a strange issue.
> My setup are a powerpook G4 and a imacDV with a G3. I try to boot CURRENT
> kernel, atm rev: 193648. GENERIC, WITNESS and INVARIANTS enabled/disabled,
> does not matter.
>
> I can boot the kernel successfully and login to the machines via ssh.
> But as soon as I try to login via console/kbd I get a freeze w/o a notice
> why. The machines are dead as soon as I press a key on the keyboard. The
> mouse is working ok before pressing a key.
>
> There is _no_ message in the logs about...
>
> On the imac, the kbd is usb. On the Powerbook, the kbd is adb.
>
> The last working kernel I have is from 20090531, the rev with the dfs
> driver.
>
> I did not find an obvious candidate causing this, at least on the powerpc
> part.
>
> Does anyone else see such a behavior?
>
> TIA,
> Andreas

I have to give a "me too" on this.  revision 192758 (previous, and
currently running kernel) works, but 193636 (latest svn up) freezes.

G4 MDD 1.25GHz, no WITNESS, apple pro USB keyboard.  Not sure about
moving the mouse, because I run SLiM for the login manager which
disables the mouse cursor, but I'll assume it's the same behavior
you're seeing -- machine completely freezes with any keyboard
activity.

- Justin
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[Andreas Tobler-5]

Justin Hibbits wrote:

> On Sun, Jun 7, 2009 at 4:44 PM, Andreas Tobler<andreastt@...> wrote:
>> Hi all,
>>
>> I have here a strange issue.
>> My setup are a powerpook G4 and a imacDV with a G3. I try to boot CURRENT
>> kernel, atm rev: 193648. GENERIC, WITNESS and INVARIANTS enabled/disabled,
>> does not matter.
>>
>> I can boot the kernel successfully and login to the machines via ssh.
>> But as soon as I try to login via console/kbd I get a freeze w/o a notice
>> why. The machines are dead as soon as I press a key on the keyboard. The
>> mouse is working ok before pressing a key.
>>
>> There is _no_ message in the logs about...
>>
>> On the imac, the kbd is usb. On the Powerbook, the kbd is adb.
>>
>> The last working kernel I have is from 20090531, the rev with the dfs
>> driver.
>>
>> I did not find an obvious candidate causing this, at least on the powerpc
>> part.
>>
>> Does anyone else see such a behavior?
>>
>> TIA,
>> Andreas
>
>
> I have to give a "me too" on this.  revision 192758 (previous, and
> currently running kernel) works, but 193636 (latest svn up) freezes.
>
> G4 MDD 1.25GHz, no WITNESS, apple pro USB keyboard.  Not sure about
> moving the mouse, because I run SLiM for the login manager which
> disables the mouse cursor, but I'll assume it's the same behavior
> you're seeing -- machine completely freezes with any keyboard
> activity.

Thanks for confirmation! I thought I shot my tree.

Just for info:

It is rev 193512 which is causing this behavior.

I'll look into the ppc code now.

Andreas
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[Ed Schouten-3]

Hi all,

I just get randomly added to the CC here, so let me get this straight:

* Andreas Tobler <andreast-list@...> wrote:
> It is rev 193512 which is causing this behavior.

So my changes to kbd and kbmux broke PPC. Great. ;-)

Can you try the changes I made to kbd and kbmux separately? This makes
it easier for me to track it down. Thanks!

--
 Ed Schouten <ed@...>
 WWW: http://80386.nl/

[Andreas Tobler-5]

Hi Ed,

Ed Schouten wrote:

> I just get randomly added to the CC here, so let me get this straight:
>
> * Andreas Tobler <andreast-list@...> wrote:
>> It is rev 193512 which is causing this behavior.
>
> So my changes to kbd and kbmux broke PPC. Great. ;-)
>
> Can you try the changes I made to kbd and kbmux separately? This makes
> it easier for me to track it down. Thanks!

The kdb diff alone works.
But the kdbmux diff seems to be the one causing the freeze.

I tested on top of 193511.

Thank you for the immediate response!

Andreas

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[Ed Schouten-3]

* Andreas Tobler <andreast-list@...> wrote:
> The kdb diff alone works.
> But the kdbmux diff seems to be the one causing the freeze.
>
> I tested on top of 193511.

Ah! Looking at the diff, I think I can only have messed up inside the
_putc() and _getc() routines I added. One of the biggest differences
between i386/am64 and PowerPC: characters are unsigned by default! I'm
going to slam my head against the wall for the next couple of minutes.
Let me know whether it fixes your problem.

%%%
Index: kbdmux.c
===================================================================
--- kbdmux.c (revision 193733)
+++ kbdmux.c (working copy)
@@ -181,7 +181,7 @@
  state->ks_inq_length++;
 }
 
-static char
+static int
 kbdmux_kbd_getc(kbdmux_state_t *state)
 {
  char c;
%%%

--
 Ed Schouten <ed@...>
 WWW: http://80386.nl/

[Andreas Tobler-5]

Ed Schouten wrote:

> * Andreas Tobler <andreast-list@...> wrote:
>> The kdb diff alone works.
>> But the kdbmux diff seems to be the one causing the freeze.
>>
>> I tested on top of 193511.
>
> Ah! Looking at the diff, I think I can only have messed up inside the
> _putc() and _getc() routines I added. One of the biggest differences
> between i386/am64 and PowerPC: characters are unsigned by default! I'm
> going to slam my head against the wall for the next couple of minutes.

Don't do that, we need your head healthy :)

> Let me know whether it fixes your problem.

It does. Should have seen that myself :(

I'm up to rev 193751 now. With your patch.

FreeBSD 8.0-CURRENT (GENERIC_imac) #0 r193751M: Mon Jun  8 22:15:57 CEST
2009

Thank you!

Cheers,
Andreas
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[Ed Schouten-3]

* Andreas Tobler <andreast-list@...> wrote:
> I'm up to rev 193751 now. With your patch.

Rev. 193752 includes the fix, with minor modifications. Thanks for
reporting it!

--
 Ed Schouten <ed@...>
 WWW: http://80386.nl/