Re: [BUG]: kernel BUG at mm/swapfile.c:806! (2.6)

[Hugh Dickins]

On Fri, 6 Feb 2004, [koi8-r] "Good Oleg[koi8-r] "  wrote:

> PC(see below) 256Mib of RAM, linux-2.6.2, 300Mib swap file (swapon /mnt/swap/swap)
> When programs cause big memory usage i have this
> (since my 2.4.22 to 2.6.0-test11 migration):
> 
> Feb  6 02:26:27 gluon kernel: ------------[ cut here ]------------
> Feb  6 02:26:27 gluon kernel: kernel BUG at mm/swapfile.c:806!
> Feb  6 02:26:27 gluon kernel: invalid operand: 0000 [#1]
> Feb  6 02:26:27 gluon kernel: CPU:    0
> Feb  6 02:26:27 gluon kernel: EIP:    0060:[<c015c7c4>]    Tainted: PFS
> Feb  6 02:26:27 gluon kernel: EFLAGS: 00010246
> Feb  6 02:26:27 gluon kernel: EIP is at map_swap_page+0x34/0x60

[ helpful info snipped ]

Interesting, thank you.  That's the second report (first on 16 Jan,
and in that case Not Tainted).  I looked around and found some bugs in
the swapfile page accounting (if swapfile filesystem blocksize < 4k:
is yours?  never heard back from Marcel on that) - still intermittently
working on and testing the fixes there - but in the end nothing which
would actually cause this BUG.  Was rather thinking it came from slab
corruption, but a second report makes that (a little) less likely.
I'll look again later on, but other eyes may find it sooner.

Hugh

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