Re: Regression 7.0R -> 7-stable?

On Tue, 7 Oct 2008 13:38:01 +0200 Gerrit Kühn <gerrit@pmp.uni-hannover.de>
wrote about Re: Regression 7.0R -> 7-stable?:

[...]

GK> However, yesterday I upgraded the system to a recent 7-stable
GK> codebase, and now it locks again hard after probing the CPU cores. My
GK> setup remained exactly the same, the new code just does not work.
GK> Please let me know what I have do to provide further information.

Well, comparing the kernel setups again I found one thing that makes a
difference: The scheduler (somewhen SCHED_ULE has been declared the
default).
SCHED_ULE is crashing the system, SCHED_4BSD works fine...


cu
Gerrit
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On Tuesday 07 October 2008 09:37:10 am Jeremy Chadwick wrote:[color=blue]
> On Tue, Oct 07, 2008 at 02:37:24PM +0200, Gerrit Kühn wrote:[color=green]
> > On Tue, 7 Oct 2008 13:38:01 +0200 Gerrit Kühn <gerrit@pmp.uni-hannover.de>
> > wrote about Re: Regression 7.0R -> 7-stable?:
> >
> > [...]
> >
> > GK> However, yesterday I upgraded the system to a recent 7-stable
> > GK> codebase, and now it locks again hard after probing the CPU cores. My
> > GK> setup remained exactly the same, the new code just does not work.
> > GK> Please let me know what I have do to provide further information.
> >
> > Well, comparing the kernel setups again I found one thing that makes a
> > difference: The scheduler (somewhen SCHED_ULE has been declared the
> > default).
> > SCHED_ULE is crashing the system, SCHED_4BSD works fine...[/color]
>
> This is of great concern if in fact that's true.
>
> I'm adding Jeff Roberson, author of the ULE/SMP2.0 code, to the CC.[/color]

Do you have more details about the crash? Are you getting an actual panic
with messages on the console, or are you still seeing hangs? When you get a
hang, can you break into the debugger and get a crash dump?

--
John Baldwin
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On Tue, 7 Oct 2008 10:02:56 -0400 John Baldwin <jhb@freebsd.org> wrote
about Re: Regression 7.0R -> 7-stable?:

JB> Do you have more details about the crash? Are you getting an actual
JB> panic with messages on the console, or are you still seeing hangs?

Like it was before: system just hangs after displaying the probing
messages about the CPU cores; next step for a working kernel would be
mounting of the file systems (and changing from white kernel output to grey
system output).

JB> When you get a hang, can you break into the debugger and get a crash
JB> dump?

Is there a documentation somewhere how to do this?


cu
Gerrit
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On Tue, Oct 07, 2008 at 04:15:34PM +0200, Gerrit Kühn wrote:[color=blue]
> On Tue, 7 Oct 2008 10:02:56 -0400 John Baldwin <jhb@freebsd.org> wrote
> about Re: Regression 7.0R -> 7-stable?:
>
> JB> Do you have more details about the crash? Are you getting an actual
> JB> panic with messages on the console, or are you still seeing hangs?
>
> Like it was before: system just hangs after displaying the probing
> messages about the CPU cores; next step for a working kernel would be
> mounting of the file systems (and changing from white kernel output to grey
> system output).[/color]

Actually, I think you mean mounting of the root filesystem, do you not?

If so, others have recently reported this problem (hard lock-ups before
or after printing "Mounting root from...").
[color=blue]
> JB> When you get a hang, can you break into the debugger and get a crash
> JB> dump?
>
> Is there a documentation somewhere how to do this?[/color]

John can probably help you with the commands you need to type, but the
FreeBSD Handbook goes over the general commands.

As far as getting into the debugger, it's Control-Alt-Esc from the
console.

--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking [url]http://www.parodius.com/[/url] |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |

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On Tue, 7 Oct 2008 07:25:42 -0700 Jeremy Chadwick <koitsu@FreeBSD.org>
wrote about Re: Regression 7.0R -> 7-stable?:

JC> > Like it was before: system just hangs after displaying the probing
JC> > messages about the CPU cores; next step for a working kernel would
JC> > be mounting of the file systems (and changing from white kernel
JC> > output to grey system output).

JC> Actually, I think you mean mounting of the root filesystem, do you not?
JC> If so, others have recently reported this problem (hard lock-ups
JC> before or after printing "Mounting root from...").

Yes, of course (sorry for being vague).

JC> > JB> When you get a hang, can you break into the debugger and get a
JC> > JB> crash dump?

JC> > Is there a documentation somewhere how to do this?

JC> John can probably help you with the commands you need to type, but the
JC> FreeBSD Handbook goes over the general commands.
JC> As far as getting into the debugger, it's Control-Alt-Esc from the
JC> console.

Ok, I added options KDB and DDB to my kernel configuration and compiled
with SCHED_ULE. However, after hanging the system does not react on
Ctrl-Alt-Esc. Am I missing something?


cu
Gerrit
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