Re: 2.6.12-rc1-mm3

Andrew Morton
2005-03-31T20:11:50Z

Borislav Petkov <petkov@uni-muenster.de> wrote:
>
> On Friday 25 March 2005 17:46, Borislav Petkov wrote:
> > Hi Andrew,
> >
> > mm3 still not booting on my machine. Boot option 'nmi_watchdog=2' (my cpu
> > is a dual core pentium 4 HT, 2.60 GHz) gets me a bit further in the boot
> > process but it blocks there too.
> >
> > [output retyped from screen]:
> > kernel: [ 4.109241] PM: Checking swsusp image.
> > kernel: [ 4.109244] PM: Resume from disk failed.
> > kernel: [ 4.112220] VFS: Mounted root (ext2 filesystem) readonly.
> > kernel: [ 4.112465] Freeing unused kernel memory: 188k freed
> > kernel: [ 4.142002] logips2pp: Detected unknown logitech mouse model 1
> > kernel: [ 4.274620] input: PS/2 Logitech Mouse on isa0060/serio1
> > <--- [point of previous blocks without boot option 'nmi_watchdog=2']--->
> > INIT: version 2.86 booting
> > Mounting a tmpfs over /dev... done.
> > Creating initial device nodes... done.
> > Setting parameters of disc: (none).
> > Activating swap.
> > kernel: [ 10.712648] Adding 976744k swap on /dev/hda2. Priority:-1
> > extents:1 Checking root file system...
> > fsck 1.36 (05-Feb-2005)
> > /: clean, 127290/1831424 files, 898566/3662056 blocks
> > [EOF]
>
> Hi Andrew,
>
> i finally got to run kdb within mm3 and I got a bit further but am not sure
> whether I'm debugging in the right direction:
>
> After booting with "kdb=early" I found out that the kernel blocks with the
> partial message:
>
> kmem_cache_create: Early error in slab task_struct
> kernel BUG at mm/slab.c:1215
> invalid operand: 0000 [#1]
> PREEMPT SMP

Beats me. Where did the kdb patch come from?

It sounds like kdb for some reason is leaving the calling task in
in_interrupt() state when it shouldn't. You could try removing the
in_interrupt() test, but things will probably die later on.

It might be worth disabling preempt, although a bug there won't cause
in_interrupt() to return true.

Did you send me your .config?