On Wed, 30 May 2007, Andrew Morton wrote:

quoted text
> On Wed, 30 May 2007 15:02:49 +0300 (EEST) Tero Roponen <teanropo@jyu.fi> wrote:
> 
> > On Wed, 30 May 2007, Pekka Enberg wrote:
> > 
> > > On 5/30/07, Tero Roponen <teanropo@jyu.fi> wrote:
> > > > Hmmm, I just found something interesting. In 2.6.21.3 the /sbin/init
> > > > gets corrupted when I watch the video!
> > > >
> > > > $ cp /sbin/init init.before
> > > > $ mplayer kiwi.flv
> > > > $ cp /sbin/init init.after
> > > >
> > > > The sha1sums are here:
> > > >
> > > > 52c8d643057619cbe137b8e69d4709ce3bdd832d  init.after
> > > > 8efc7864a5b535a9e336fa82e9d7f112f3d956c1  init.before
> > > >
> > > > It seems that something corrupts memory somewhere...
> > > 
> > > To debug this a bit further:
> > > 
> > > $ od -a -t x1 -v init.after > init.after.dump
> > > $ od -a -t x1 -v init.before > init.before.dump
> > > $ diff -u init.before.dump init.after.dump | less
> > > 
> > > -0011340  nul nul nul  e9  f0  fe  ff  ff  ff   %   < soh enq  bs   h  80
> > > -           00  00  00  e9  f0  fe  ff  ff  ff  25  3c  01  05  08  68  80
> > > +0010000    y ack nul nul   y ack nul nul   y ack nul nul   y ack nul nul
> > > +           79  06  00  00  79  06  00  00  79  06  00  00  79  06  00  00
> > > +0010020    y ack nul nul   y ack nul nul   y ack nul nul   y ack nul nul
> > > +           79  06  00  00  79  06  00  00  79  06  00  00  79  06  00  00
> > > +0011340    y ack nul nul   y ack nul nul  ff   %   < soh enq  bs   h  80
> > > +           79  06  00  00  79  06  00  00  ff  25  3c  01  05  08  68  80
> > > 
> > > The file at offset 0010000 - 0011348 is overwritten with the byte
> > > pattern 79 06 00 00.
> > > 
> > > Do you see anything in the logs or is this a silent corruption? Did
> > > you see this corruption with 2.6.19 or 2.6.22-rc3?
> > > 
> > 
> > I recompiled 2.6.22-rc3 and booted it with slub_debug. Now I can't oops
> > the kernel, but ./slab_info -v gives me a warning:
> > 
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > neofb: no support for 32bpp
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1024x768) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1152x864) larger than the LCD panel (800x600)
> > Mode (1024x1024) larger than the LCD panel (800x600)
> > Mode (1024x1024) larger than the LCD panel (800x600)
> > Mode (1024x1024) larger than the LCD panel (800x600)
> > Mode (1024x1024) larger than the LCD panel (800x600)
> > Mode (1280x1024) larger than the LCD panel (800x600)
> > Mode (1280x1024) larger than the LCD panel (800x600)
> > Mode (1280x1024) larger than the LCD panel (800x600)
> > Mode (1280x1024) larger than the LCD panel (800x600)
> > *** SLUB kmalloc-1024: Redzone Active@0xc10be860 slab 0xc10217c0
> >     offset=2144 flags=0x80004082 inuse=7 freelist=0x00000000
> >   Bytes b4 0xc10be850:  00 00 00 00 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a ........ZZZZZZZZ
> >     Object 0xc10be860:  00 00 00 00 00 20 00 00 20 03 00 00 58 02 00 00 ............X...
> >     Object 0xc10be870:  20 03 00 00 58 02 00 00 00 00 00 00 00 00 00 00 ....X...........
> >     Object 0xc10be880:  10 00 00 00 00 00 00 00 0b 00 00 00 05 00 00 00 ................
> >     Object 0xc10be890:  00 00 00 00 05 00 00 00 06 00 00 00 00 00 00 00 ................
> >     Object 0xc10be8a0:  00 00 00 00 05 00 00 00 00 00 00 00 00 00 00 00 ................
> >     Object 0xc10be8b0:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> >     Object 0xc10be8c0:  ff ff ff ff ff ff ff ff 00 00 00 00 a8 61 00 00