Re: 2.6.1: kernel BUG at mm/swapfile.c:806

[marcel cotta]

Andrew Morton wrote:
> marcel cotta <marcel@xxxxxxxxxxxxx> wrote:
>
> > Andrew Morton wrote:
> >
> > > marcel cotta <marcel@xxxxxxxxxxxxx> wrote:
> > >
> > >
> > > > i got this oops after the box swapped like crazy under X for about 5 
> > > > minutes
> > > > while swapping it was nearly unusable (jerky mouse, console switching 
> > > > took 10 seconds)
> > > > the extreme performance drop is always reproducible when swapping starts
> > > >
> > > >
> > > > ------------[ cut here ]------------
> > > > kernel BUG at mm/swapfile.c:806!
> > >
> > >
> > > Amazing.  Are you using a swapfile, or are you swapping to a block device?
> >
> > hehe, hasnt been reported for a while eh ;)
> >
> > i used swapfiles, one static 50mb file and the rest in temp 16MB 
> > blocks managed by swapd
>
>
> What is `swapd'?


the box is still running and i just saw another thing

hades:~# cat /proc/swaps
Filename                                Type            Size    Used
  Priority
/swap/linux0.swp                         file           14184   14160   -1
/swap/linux1.swp                         file           16184   16036
  -22
/swap/linux2.swp                         file           16184   15740
  -23
/swap/linux3.swp                         file           16184   15720
  -28
/swap/linux4.swp                         file           16184   15960
  -43
/swap/linux5.swp                         file           16184   13380
  -44
/swap/linux6.swp                         file           16184   104
  -45
/swap/linux7.swp                         file           16184   0
  -46
/swap/linux8.swp                         file           16184   4
  -47


hades:~# free
             total       used       free     shared    buffers     cached
Mem:        188724     184076       4648          0        328      33176
-/+ buffers/cache:     150572      38152
Swap:       127476      90528      36948


have a look at the total swap amount, free reports 127476 but the
total should be 143656
the /swap/linux0.swp file being 2mb smaller is no error
it is caused by setting swapfile size in /etc/swapd.conf to 14184,
while only
this file being in use, and restarting swapd with 16184 as new
swapfile size


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