Re: [gentoo-embedded] lockups with hardened kernel

[Peter S. Mazinger]

On Sat, 7 Jan 2006, Mike Frysinger wrote:

> On Saturday 07 January 2006 02:30, Natanael Copa wrote:
> > On lør, 2006-01-07 at 00:44 -0500, Mike Frysinger wrote:
> > > On Wednesday 04 January 2006 03:52, Natanael Copa wrote:
> > > > I got a report from someone who experienced lockups when using
> > > > gentoo-embedded built system (2.6.14-hardened-r1)
> > >
> > > this is a hardened kernel issue rather than a userland issue ... you'd be
> > > better off e-mailing the gentoo-hardened list
> >
> > Probably, but I think I found the reason. Whenever I build the kernel
> > with "optimize for size" it hangs after an hour with intense net load
> > and io load (I made a loop that dd if=/dev/cdrom)
> >
> > When I disabled "Configure standard kernel features (for small
> > systems)" (gcc -Os) the problem magically went away.
>
> the kernel can be pretty sensitive to optimizations

if kernel is built w/ gcc-3.4.4 and -Os (at least I had that for 2.4.x 
kernels) it "optimizes away" memcmp and the kernels have gotten a patch 
to overcome this, the same problem does not occur w/ gcc-3.3.x.

> > So I think its a bug in gcc version 3.4.4 (Gentoo Hardened 3.4.4-r1,
> > ssp-3.4.4-1.0, pie-8.7.8)
> >
> > Makes me nervous because I have built everything with -Os.

I have built everything w/ -Os and do not have trouble w/ it

Peter

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Peter S. Mazinger <ps dot m at gmx dot net>           ID: 0xA5F059F2
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