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

[Steven Cole]

On Monday 17 May 2004 07:42 pm, Andrew Morton wrote:
> Larry McVoy <lm@xxxxxxxxxxxx> wrote:
> >
> >  > I'd really like to see this happen on some other machine though.  It'd be
> >  > funny if you have a dud disk drive or something.
> > 
> >  We can easily rule that out.  Steven, do a 
> > 
> >  	dd if=/dev/zero of=USE_SOME_SPACE bs=1048576 count=500

I'll get to Larry's test a little later.  Pizza's about to come out of the oven.

> > 
> >  which will eat up 500 MB and should eat up any bad blocks.  I _really_
> >  doubt it is a bad disk.
> 
> Yes, me too.  The sensitivity to CONFIG_PREEMPT makes that unlikely.
> 
> Two things I'm not clear on:
> 
> a) Has is been established that CONFIG_PREEMPT causes ppp to fail?

At the risk of a "post hoc ergo propter hoc" fallacy, I'd say yes.  I have not
seen ppp fail without PREEMPT.  No PREEMPT, no ppp problems.

> 
> b) Has the file corruption been observed when PPP was not in use at all?

No, at least I don't have any specific memory of corruption without ppp.

I made a fresh 3.9G reiserfs fs on my second disk, and cloned a kernel
tree to it.  I can use it for testing, but its currently in sync with linux.bkbits.net/linux-2.5.

Later,
Steven 
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