Re: 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.)

Steven Cole
2004-05-17T11:59:39Z

On Monday 17 May 2004 01:46 am, Andrew Morton wrote:
> Andrew Morton <akpm@osdl.org> wrote:
> >
> > If an application does mmap(MAP_SHARED) of, say, a 2048 byte file and then
> > extends it:
> >
> > p = mmap(..., fd, ...);
> > ftructate(fd, 4096);
> > p[3000] = 1;
> >
> > A racing block_write_full_page() could fail to notice the extended i_size
> > and would decide to zap those 2048 bytes anyway.
>
> This should plug it.

I'll test this tonight when I get back to this home machine.

Thanks, and thanks to Bitmover for providing the resources to help chase this bug.

Steven