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Subject: Re: Oopses with both recent 2.4.x kernels and 2.6.x kernels
From: Steven Dake <sdake@mvista.com>
Reply-To: sdake@mvista.com
To: Stian Jordet <liste@jordet.nu>
Cc: Marcelo Tosatti <marcelo.tosatti@cyclades.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Marcelo and Stian,

I have also seen this oops relating to low memory situations.  I think
ext3 allocates some data, has a null return, sets something to null, and
then later it is dereferenced in kwapd.

Anyone have a patch for this problem?

Thanks
-steve

On Tue, 2004-03-02 at 04:03, Stian Jordet wrote:
> fre, 06.02.2004 kl. 00.51 skrev Marcelo Tosatti:
> > On Tue, 3 Feb 2004, Stian Jordet wrote:
> > 
> > > Hello,
> > >
> > > I have a server which was running 2.4.18 and 2.4.19 for almost 200 days
> > > each, without problems. After an upgrade to 2.4.22, the box haven't been
> > > up for 30 days in a row. This happened early november. I have caputered
> > > oopses with both 2.4.23 and 2.6.1 which I have sent decoded to the list,
> > > but have never got any reply.
> > >
> > > I have ran memtest86 on the box, no errors. What else can be the
> > > problem? I could of course go back to 2.4.19, which I know worked fine,
> > > but I there have been some fixed security holes since then...
> > >
> > > Any thoughts?
> > 
> > Stian,
> > 
> > I have seen your 2.4.x oopses and they seemed odd. The faults were
> > happening in different functions (mostly inside VM "freeing" , due to
> > what seems to be random crap in memory:
> >
> >  <1>Unable to handle kernel NULL pointer dereference at virtual address 00000021
> > c0132e86
> > *pde = 00000000
> > 
> > eax: 00000000   ebx: 00000009   ecx: 000001d2   edx: 00000012
> > esi: 00000000   edi: c17e38c0   ebp: c1047a00   esp: c86cbdb4
> > 
> > >>EIP; c0132e86 <sync_page_buffers+e/a4>   <=====
> > 
> > >>edi; c17e38c0 <_end+14b5844/bd23f84>
> > >>ebp; c1047a00 <_end+d19984/bd23f84>
> > >>esp; c86cbdb4 <_end+839dd38/bd23f84>
> > 
> > Trace; c0132fdc <try_to_free_buffers+c0/ec>
> > 
> > Code;  c0132e86 <sync_page_buffers+e/a4>
> > 00000000 <_EIP>:
> > Code;  c0132e86 <sync_page_buffers+e/a4>   <=====
> >    0:   f6 43 18 06               testb  $0x6,0x18(%ebx)   <=====
> > Code;  c0132e8a <sync_page_buffers+12/a4>
> >    4:   74 7c                     je     82 <_EIP+0x82> c0132f08
> > <sync_page_buffers+90/a4>
> > Code;  c0132e8c <sync_page_buffers+14/a4>
> >    6:   b8 07 00 00 00            mov    $0x7,%eax
> > Code;  c0132e91 <sync_page_buffers+19/a4>
> > 
> > 
> > 
> > 
> >  <1>Unable to handle kernel NULL pointer dereference at virtual address
> > 00000028
> > c015e3a2
> > *pde = 00000000
> > Oops: 0000
> > CPU:    0
> > EIP:    0010:[<c015e3a2>]    Not tainted
> > EFLAGS: 00010203
> > 
> > eax: 0100004d   ebx: 00000000   ecx: 000001d2   edx: 00000000
> > 
> > Code;  c015e3a2 <journal_try_to_free_buffers+5a/98>
> > 00000000 <_EIP>:
> > Code;  c015e3a2 <journal_try_to_free_buffers+5a/98>   <=====
> >    0:   8b 5b 28                  mov    0x28(%ebx),%ebx   <=====
> > Code;  c015e3a5 <journal_try_to_free_buffers+5d/98>
> >    3:   f6 42 19 04               testb  $0x4,0x19(%edx)
> > Code;  c015e3a9 <journal_try_to_free_buffers+61/98>
> >    7:   74 17                     je     20 <_EIP+0x20> c015e3c2
> > <journal_try_to_free_buffers+7a/98>
> > 
> > And other similar oopses.
> > 
> > Are you sure there is nothing messing up the hardware ?
> > 
> > How long have you ran memtest86? It can, sometimes, take a long to showup
> > errors.
> > 
> > The 2.6.x oopses on the same hardware is also a useful source of
> > information.
> 
> Marcelo,
> 
> sorry for getting back to you so insanely late. This was a production
> server, and I have now moved the services it were running to another
> box, so I could run a more exhaustive memtest86. It has now ran for two
> days, without any errors. Of course there could be other flaky hardware,
> but since I don't know any way to test it, and the oops occurs with
> two-four weeks interval, it's quite time consuming to find out. I'm not
> even sure if it will oops without the typical load it used to have.
> 
> Anyway, thank you very much for at least answering me. Much appreciated
> :)
> 
> Best regards,
> Stian
> 
> -
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