Kernel Error / Crash

Kernel Error / Crash

[werner]

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To: linux-kernel@vger.kernel.org


copied from the screen:

...
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
Starting udevd: /sbin/udevd -- daemon
------------[cut here]-------------------
Kernel BUG at mm/slub.c:2401!
Invalid opcode: 0000[#1]
SMP
Modules linked in:
CPU: 0
EIP: 0060: [<c0174ec0>]   Not tainted VLI
EFLAGS:  00010046  (2.6.22-git13-i486-1mn #1)
EIP is at ksize + 0x40/0x50
  .....

Obs:  With 2.6.22-git11 that problem didnt occur

Werner Landgraf
werner@copaya.yi.org

Re: Kernel Error / Crash

[Satyam Sharma]

Hi Werner,

On 7/20/07, werner <werner@copaya.yi.org> wrote:
> To: linux-kernel@vger.kernel.org
>
>
> copied from the screen:
>
> ...
> proc on /proc type proc (rw)
> sysfs on /sys type sysfs (rw)
> Starting udevd: /sbin/udevd -- daemon
> ------------[cut here]-------------------
> Kernel BUG at mm/slub.c:2401!

That's ksize(invalid_address) -- when the address belongs to an
!PageSlab page.

> Invalid opcode: 0000[#1]
> SMP
> Modules linked in:
> CPU: 0
> EIP: 0060: [<c0174ec0>]   Not tainted VLI
> EFLAGS:  00010046  (2.6.22-git13-i486-1mn #1)

Why is the kernel called -git13-i486-1mn (the -1mn part)?

Is this a pure vanilla kernel or do you have additional patches
applied on top of that?

> EIP is at ksize + 0x40/0x50

Hmm. This could be from krealloc(), but that's just a wild guess.

>   .....

Please send us the entire oops log (including the registers contents,
stack backtrace, "Code:" thing, et al.) -- it's *impossible* to debug
this case, otherwise.

> Obs:  With 2.6.22-git11 that problem didnt occur
>
> Werner Landgraf
> werner@copaya.yi.org


Thanks,

Satyam

Re: Kernel Error / Crash

[Satyam Sharma]

On 7/20/07, Satyam Sharma <satyam.sharma@gmail.com> wrote:
> Hi Werner,
>
> On 7/20/07, werner <werner@copaya.yi.org> wrote:
> > To: linux-kernel@vger.kernel.org
> >
> >
> > copied from the screen:
> >
> > ...
> > proc on /proc type proc (rw)
> > sysfs on /sys type sysfs (rw)
> > Starting udevd: /sbin/udevd -- daemon
> > ------------[cut here]-------------------
> > Kernel BUG at mm/slub.c:2401!
>
> That's ksize(invalid_address) -- when the address belongs to an
> !PageSlab page.

Oh, ok so this is fixed in 9550b105b8646f916862aee3ab7b25020ca14159
in mainline -git for some time now.

[ turns out the bug was in ksize() itself, so there wasn't need for
a stack trace after all :-p ]